@article{ author = {R.K.Misra, and N.V.Rachchh,}, title = {MECHANICAL CHARACTERIZATION AND ANALYSIS OF RANDOMLY DISTRIBUTED SHORT BANANA FIBER REINFORCED EPOXY COMPOSITES}, abstract ={Short banana fiber reinforced composites have been prepared in laboratory to determine mechanical properties. It has been observed that as soon as the percentage of the banana fiber increases slightly there is a tremendous increase in ultimate tensile strength, % of strain and young modulus of elasticity. Reinforcement of banana fibers in epoxy resin increases stiffness and decreases damping properties of the composites. Therefore, 2.468% banana fiber reinforced composite plate stabilizes early as compared to 7.7135 % banana fiber reinforced composite plate but less stiff as compared to 7.7135 % banana fiber reinforced composite plate}, Keywords = {banana fiber, epoxy resin, multi quadric radial basis function method, damping properties, stiffness}, volume = {11}, Number = {1}, pages = {1-16}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-634-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-634-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {N.Khatami, and Sh.Mirdamadi,}, title = {EFFECT OF CONTROLLED QUENCHING ON THE AGING OF 2024 ALUMINUM ALLOY CONTAINING BORON}, abstract ={The presence of alloying elements, sometimes in a very small amount, affects mechanical properties one of these elements is Boron. In Aluminum industries, Boron master alloy is widely used as a grain refiner In this research, the production process of Aluminum –Boron master alloy was studied at first then, it was concurrently added to 2024 Aluminum alloy. After rolling and homogenizing the resulting alloy, the optimal temperature and time of aging were determined during the precipitation hardening heat treatment by controlled quenching (T6C). Then, in order to find the effect of controlled quenching, different cycles of heat treatment including precipitation heat treatment by controlled quenching (T6C) and conventional quenching (T6) were applied on the alloy at the aging temperature of 110°C. Mechanical properties of the resulting alloy were evaluated after aging at optimum temperature of 110°C by performing mechanical tests including hardness and tensile tests. The results of hardness test showed that applying the controlled quenching instead of conventional quenching in precipitation heat treatment caused reduction in the time of reaching the maximum hardness and also increase in hardness rate due to the generated thermo-elastic stresses rather than hydrostatic stresses and increased atomic diffusion coefficient as well. Tensile test results demonstrated that, due to the presence of boride particles in the microstructure of the present alloy, the ultimate tensile strength in the specimens containing Boron additive increased by 3.40% in comparison with the specimens without such an additive and elongation (percentage of relative length increase) which approximately increased by 38.80% due to the role of Boron in the increase of alloy ductility}, Keywords = {Aluminum–Boron master alloy, 2024 Aluminum alloy, Precipitation hardening heat treatment, Controlled}, volume = {11}, Number = {1}, pages = {17-26}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-635-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-635-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.H.Goodarzy, and H.Arabi, and M.A.Boutorabi, and S.H.Seyedein, and H.Shahrokhi,}, title = {DISLOCATIONS STRUCTURE AND SCATTERING PHENOMENON IN CRYSTALLINE CELL SIZE OF 2024 AL ALLOY DEFORMED BY ONE PASS OF ECAP AT ROOM TEMPERATURE}, abstract ={Variation in microstructural features of 2024 aluminum alloy plastically deformed by equal channel angular pressing (ECAP) at room temperature, was investigated by X-Ray diffraction in this work. These include dislocation density dislocation characteristic and the cell size of crystalline domains. Dislocations contrast factor was calculated using elastic constants of the alloy such as C 11, C 22 and C 44 . The effect of dislocations contrast factor on the anisotropic strain broadening of diffraction profiles was considered for measuring the microstructural features on the base of the modified Williamson-Hall and Warren-Averbach methods. Results showed that the dislocations density of the solution annealed sample increased from 4.28×10 12m-2 to 2.41×10 14m-2 after one pass of cold ECAP and the fraction of edge dislocations in the solution annealed sample increased from 43% to 74% after deformation. This means that deformation changed the overall dislocations characteristic more to edge dislocations. Also the crystalline cell size of the solution annealed sample decreased from 0.83μm to about 210nm after one pass of ECAP process at room temperature}, Keywords = {ECAP, 2024 aluminum alloy, XRD, peak broadening, dislocation contrast factor}, volume = {11}, Number = {1}, pages = {27-38}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-633-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-633-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.Kadkhodaee, and H.Daneshmanesh, and B.Hashemi, and J.Moradgholi,}, title = {INVESTIGATION OF TRIBOLOGICAL CHARACTERISTICS OF AL/NANO SiO2NANOCOMPOSITES PRODUCED BY ACCUMULATIVE ROLL BONDING (ARB) PROCESS}, abstract ={Accumulative roll-bonding process (ARB) is an important severe plastic deformation technique for production of the ultrafine grained, nanostructured and nanocomposite materials in the form of plates and sheets. In the present work, this process used for manufacturing Al/SiO 2 nanocomposites by using Aluminum 1050 alloy sheets and nano sized SiO 2 particles, at ambient temperature. After 8 cycles of ARB process, the tribological properties and wear resistance of produced nanocomposites were investigated. The wear tests by abrasion were performed in a pinon-disc tribometer. Results show that by increasing ARB cycles and the amount of nano powders, the friction coefficient of produced nanocomposites decreases.}, Keywords = {Nanocomposite, Nanoparticles, Severe plastic deformation (SPD) process, Accumulative roll bonding}, volume = {11}, Number = {1}, pages = {39-45}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-636-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-636-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.ShcikhshabBafghi, and F.Friz', and M.Sakaki,}, title = {A PARAMETRIC STUDY ON THE SULFURIC ACID LEACHING OF VANADIUM OF AN IRANIAN THERMAL POWER PLANT ASH}, abstract ={Vanadium recovery of Thermal Power Plant Ash (TPPA) is an attractive process which simultaneously satisfies the pollution control standards regarding TPPA disposal and provides a valuable source of vanadium for industrial demands. In the present research work, sulfuric acid leaching route has been employed for vanadium recovery from an Iranian TPPA. Effects of acid concentration, temperature, acid/TPPA ratio, leaching time as well as TPPA particle size on the leaching efficiency of vanadium have been investigated. Experimental results showed that leaching efficiency of vanadium is significantly affected by the leaching conditions. The results revealed that with acid concentration of about 15%, temperature around 75 °C, acid/TPPA ratio~15, leaching time about 120 minutes and particle size of 75 - 150 pm, almost 92% of vanadium can be dissolved}, Keywords = {Vanadium. Acid Leaching, Thermal Power Plant Ash}, volume = {11}, Number = {1}, pages = {46-52}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-630-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-630-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {A.Najafi, and F.Golestani-Fard, and H.R.Rezaie,}, title = {THE EFFECT OF PROCESSING PARAMETERS ON SOL GEL SYNTHESIS OF β-SiC NANO POWDER}, abstract ={Mono dispersed nano SiC particles with spherical morphology were synthesized in this project by hydrolysis and condensation mechanism during sol gel processing. pH, temperature and precursor’s ratio considered as the main parameters which could influence particles size. According to DLS test results, the smallest size of particles in the sol (<5nm) was obtained at pH<4. It can be observed from rheology test results optimum temperature for achieving nanometeric gel is about 60 ˚C. The optimum pH values for sol stabilization was (2-5) determined by zeta potentiometery. Si 29NMR analysis was used in order to get more details on final structure of gel powders resulted from initial sol. X-ray diffraction studies showed sythesized powder consists of β-SiC phase. Scanning electron microscopy indicated agglomerates size in β-SiC synthesis is less than 100 nm. Finally, TEM studies revealed morphology of β-SiC particles treated in 1500˚C and after 1hr aging is spherical with (20-30) nm size}, Keywords = { carbides; nanostructures; sol-gel chemistry; nuclear magnetic resonance (NMR); microstructure.}, volume = {11}, Number = {1}, pages = {53-61}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-632-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-632-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.Ghavidel, and S.M.Rabiee, and M.Rajabi,}, title = {THE EFFECT OF NANO BIOGLASS ON THE FABRICATION OF POROUS TITANIUM SCAFFOLDS}, abstract ={In this study, porous titanium composites containing 5, 10 and 15 wt. % nanobioglass were fabricated by space holder sintering process. The pore morphology and phase constituents of the porous samples were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The mechanical properties were determined by compression test. The porosity of the sintered samples showed an upward trend with an increase in bioglass content. As the bioglass content was increased, the compressive strength was first increased and then decreased. The results obtained in this work suggest that the fabricated porous compact with 10 wt. % bioglass with compressive strength value of about 76.7 MPa, high porosity and good biocompatibility has the potential application for bone tissue engineering.}, Keywords = {Titanium, Bioglass, Mechanical properties, Porosity.}, volume = {11}, Number = {1}, pages = {62-66}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-631-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-631-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.Mohammadnejad, and M.Ehteshamzadeh, and S.Soroushian,}, title = {EFFECT OF ANNEALING ON MICROSTRUCTURE AND CORROSION PERFORMANCE OF ADB AND ALB ALLOYS}, abstract ={Microstructure and corrosion performance of admiralty brass (ADB) and aluminum brass (ALB) alloys after passing different annealing heat treatments were investigated using optical and scanning electron microscope, energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), DC polarization measurements and electrochemical impedance spectroscopy (EIS). The results showed that heat treating of ALB caused gradient in aluminum concentration across the grains whose increased with increasing of annealing temperature. On the other hand, corrosion current density (i corr) of ADB in 3.5%NaCl media decreased with increasing of recrystallization, while ALB showed corrosion behavior inconsistent with ADB. The impedance measurements showed that corrosion rate of ADB decreased with increasing of exposure time from 0 to 15 days which could be related to the formation of SnO 2 surface film and the Sn-rich phases. While polarization resistance of ALB decreased by passing days in the corrosive media which could be associated to establishing of differential aluminum concentration cells.}, Keywords = {Admiralty brass, Aluminum brass, Annealing, Microstructure, Corrosion resistance}, volume = {11}, Number = {2}, pages = {1-13}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-651-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {A.Khakzadshahandashti, and N.Varahram, and P.Davami,}, title = {EFFECT OF CERAMIC FOAM FILTERS ON OXIDES REMOVAL AND THE TENSILE PROPERTIES OF A-356 ALLOY CASTINGS}, abstract ={This article examines the Weibull statistical analysis that was used for investigating the effect of melt filtration on tensile properties and defects formed inside the casting. Forming and entrapping of double oxide films have been explained by using the context of critical velocity of melt in the runner. SutCast software results were used to examine the amounts of the velocity of melt as such. SEM/EDX analysis is used to observe the presence of double oxide films in the fracture surfaces of the tensile specimens. The article goes on to propose that castings made with foam filters with smaller pores show higher mechanical properties and reliability due to higher Weibull modulus and fewer defects}, Keywords = {Double oxide film defect, Ceramic foam filter, Weibull module, Aluminum A356 alloy, Critical velocity}, volume = {11}, Number = {2}, pages = {14-24}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-652-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {A.Nikfahm, and I.Danaee, and A.Ashrafi, and M.R.Toroghinejad,}, title = {INVESTIGATING THE CORROSION BEHAVIOR OF NANO STRUCTURED COPPER STRIP PRODUCED BY ACCUMULATIVE ROLL BONDING (ARB) PROCESS IN ACIDIC CHLORIDE ENVIRONMENT}, abstract ={In this research accumulative roll bonding process as sever plastic deformation process was applied up to 8 cycles to produce the ultrafine grain copper. Microstructure of cycle 1, cycle 4 and cycle 8 investigated by TEM images. By analyzing TEM images the grain size measured below 100 nm in cycle 8 and it was with an average grain size of 200 nm. Corrosion resistance of rolled copper strips in comparing with unrolled copper strip was investigated in acidic (pH=2) 3.5 wt. % NaCl solution. Potentiodynamic polarization and EIS tests used for corrosion resistance investigations. The corrosion morphologies analyzed by FE-SEM microscopy after polarization test and immersion for 40 hours. Results show that the corrosion resistance decreased up to cycle 2 and increased after rolled for forth time. The corrosion degradation was more intergranular in cycle 2 and unrolled counterpart. It was more uniform rather than intergranular type in cycle 8. Corrosion current density in unrolled sample (2.55 µAcm -2 ) was about two times of that in cycle 8 (1.45 µAcm -2 ). The higher corrosion rate in cycle 2 in comparison with others was attributed to unstable microstructure and increase in dislocation density whereas the uniform corrosion in cycle 8 was due to stable UFG formation}, Keywords = {Ultrafine Grain, Corrosion, Copper, NaCl, Accumulative Roll Bonding, SPD}, volume = {11}, Number = {2}, pages = {25-36}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-653-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.GhobeitiHasab, and F.Rashchi, and Sh.Raygan,}, title = {KINETIC STUDIES FOR GOLD LEACHING OF A REFRACTORY SULFIDE CONCENTRATE BY CHLORIDE–HYPOCHLORITE SOLUTION}, abstract ={In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching rate were reported. Experimental data for leaching rate of gold were analyzed with the shrinking–core model. Results were consistent with chemical reaction control mechanism in the first 1 h of leaching and diffusion control mechanism in the second 1 h. Apparent activation energy also was found to be 22.68 kJ/mol in the first step and 3.93 kJ/mol in the second step of leaching.}, Keywords = {Gold concentrate, Non–cyanide leaching, Chloride–hypochlorite, Kinetic.}, volume = {11}, Number = {2}, pages = {37-47}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-654-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {M.Ghanbari, and M.R.Aboutalebi, and S.G.Shabestari,}, title = {EFFECT OF SPIRAL DESIGN ON CRYSTAL ORIENTATION DURING SINGLE CRYSTAL GROWTH}, abstract ={Geometrical design of the spiral crystal selector can affect crystal orientation in the final single crystal structure. To achieve a better understanding of conditions associated with the onset of crystal orientation in a spiral crystal selector, temperature field was investigated using three-dimensional finite element method during the process. Different geometries of spiral crystal selector were used to produce Al- 3 wt. % Cu alloy single crystal using a Bridgman type furnace. The Crystal orientation of the samples was determined using electron backscattered diffraction (EBSD) and optical microscopy. Analysing the temperature field in the crystal selector revealed that, the orientation of growing dendrites against liquidus isotherm in the spiral selector was the reason for crystal misorientation which differs in various selector geometries. Increasing the take-off angle from 35° up to 45° increases the misorientation with respect to direction. Further increase of take-off angle greater than 45° will decrease the crystal misorientation again and the efficiency of the selector to produce a single grain is decreased.}, Keywords = {spiral crystal selector, crystal orientation, aluminum-copper alloy, EBSD, numerical simulation.}, volume = {11}, Number = {2}, pages = {48-58}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-655-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {A.Fattah-alhosseini, and O.Imantalab,}, title = {EFFECT OF IMMERSION TIME ON THE ELECTROCHEMICAL BEHAVIOUR OF AISI 321 STAINLESS STEEL IN 0.1 M H2SO4 SOLUTION}, abstract ={In this study, effect of immersion time on the electrochemical behaviour of AISI 321 stainless steel (AISI 321) in 0.1 M H 2SO 4 solution under open circuit potential (OCP) conditions was evaluated by potentiodynamic polarization, Mott–Schottky analysis and electrochemical impedance spectroscopy (EIS). Mott–Schottky analysis revealed that the passive films behave as n-type and p-type semiconductors at potentials below and above the flat band potential, respectively. Also, Mott–Schottky analysis indicated that the donor and acceptor densities are in the range 1021 cm-3 and increased with the immersion time. EIS results showed that the best equivalent circuit presents two time constants: The high-medium frequencies time constant can be correlated with the charge transfer process and the low frequencies time constant has been associated with the redox processes taking place in the surface film. According to this equivalent circuit, the polarization resistance (interfacial impedance) initially increases with the immersion time (1 to 12 h), and then it is observed to decreases. This variation is fully accordance with potentiodynamic polarization results}, Keywords = {Stainless steel, immersion time, Mott–Schottky, Equivalent circuit}, volume = {11}, Number = {2}, pages = {57-70}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-656-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Sh.Damghanian, and H.Omidvar, and S.H.Tabaian, and A.R.Azadmehr,}, title = {FABRICATION OF A “CONE PAA NANOSTRUCTURE” BY GRADUAL DECREASE OF VOLTAGE}, abstract ={The conical nanostructure improves the applications of alumina membranes and provides three dimensional nanometer scale systems to study the chemical and physical properties. In this study, the nano cone structure is produced in porous anodic alumina (PAA) by two-step anodizing. This conical nanostructure will improve the application of PAA membranes. This approach is novel generation of the so-called "gradually decreased voltage" technique, in which the voltage- time curve is divided into three stages and the effect of each step is investigated for different electrolytes. The effect of the decreasing voltage is examined in two types of electrolytes oxalic and phosphoric acid with a constant decrease in voltage rate. The results of SEM, FE-SEM images show the slope of the inner cone layer in the oxalic acid to be considerably larger compared with phosphoric acid.}, Keywords = {Porous anodic alumina, anodizing, phosphoric acid, oxalic acid, nanostructures, cone porous}, volume = {11}, Number = {2}, pages = {71-78}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-657-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {S.Mohamed, and S.Jamal, and M.Zafer, and A.Sh.M.Yassin,}, title = {HEAT TREATMENT AND OPTICAL SPECTROSCOPY OF CR4+:GGG FOR PASSIVELY Q-SWITCHING ND:GARNET LASERS}, abstract ={High quality GGG:Cr,Ca crystal for passive Q-switching Nd:garnet lasers has been grown by the Czochralski method. Thermal treatment of GGG crystals co-doped with Cr4+ and Ca2+ at different temperatures is investigated. The absorption spectra were resolved into different peaks, of modified Gaussian line-shape. Transition from octahedral sites to tetrahedral ones is thermally activated. An optimal temperature interval for this transition was found to be 1200-1300 ˚C. The investigated samples were used as saturable absorbers in flash-lamp pumped Nd:YAG laser, and a pulse width of about 16 nsec was obtained}, Keywords = {Cr,Ca:GGG, Czochralski method, Passive Q-switch, Saturable absorber.}, volume = {11}, Number = {2}, pages = {79-86}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-658-en.html}, eprint = {}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Najmoddin, N. and Rezaie, H.R. and Beitollahi, A. and Toprak, M.S.}, title = {INFLUENCE OF THE PREPARATION METHOD ON THE STRUCTURE,PHASE FORMATION AND MAGNETIC PROPERTIES OF TEMPLATED CUFE2O4 SPINEL}, abstract ={The synthesis of mesoporous CuFe2O4 spinel by several nanocasting strategies (i.e., multi-step nanocasting, one step nanocasting, modified solid-liquid), in which copper and iron nitrates are used as precursors and Pluronic P123 as surfactant, is explored. We have also checked the effect of pH, citric acid and sodium citrate in multi-step nanocasting method. The modified solid-liquid method which contains impregnating mesoporous silica by molten state salts in a non-ionic solvent seems to be the best choice to obtain single phase ordered mesoporous copper ferrite. Other methods suffer from the presence of copper oxide or hematite as impurities or lack of integrity in the mesoporous structure. Increasing pH up to 9.5 does not enhance the phase formation inside the pores of the silica matrix. The citric acid yields a fine structure but does not facilitate the phase formation. Adding sodium citrate neither heals the phase formation nor the structure of the final product. Moreover, vinyl- functionalized mesoporous silica exploited in this study as a hard template entraps both metal nitrates in the pores, assisting impregnation procedure}, Keywords = {Mesoporous materials, Synthesis, Nanocasting, vinyl-functionalized hard template.}, volume = {11}, Number = {3}, pages = {1-10}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-676-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-676-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Ahmadi, S. and Shahverdi, H.R. and Arabi, H.}, title = {EFFECTS OF ELECTRO-SLAG REMELTING PROCESS (ESR) ON MACROSTRUCTURE AND REFINEMENT OF A MEDICAL GRADE OF STAINLESS STEEL}, abstract ={This study is focused on the effects of electroslag remelting by prefused slag (CaO, Al2O3, and CaF2) on macrostructure and reduction of inclusions in the medical grad of 316LC (316LVM) stainless steel. Results showed that in order to obtain uniform ingot structures during electroslag remelting, the shape and depth of the molten pool should be carefully controlled. High melting rates lead to deeper pool depths and interior radial solidification characteristics. Furthermore, decrease in the melting rate caused more reduction of non-metallic inclusions. In practice, large shrinkage cavities formed during the conventional casting process in the primary ingots were the cause of the fluctuation in the melting rate, pool depth and extension of equiaxal crystals zone}, Keywords = {ultra clean steel, electroslag remelting, prefused slag, vertical solidification, radial solidification and 316LVM}, volume = {11}, Number = {3}, pages = {11-17}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-677-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-677-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Allahkaram, S.R. and Mazaheri, H.}, title = {STUDY OF CHARACTERIZATION AND CORROSION RESISTANCE OF NIP/NANO-DIAMOND ELECTROLESS COMPOSITE DEPOSITION}, abstract ={Ni-P Electroless coatings provide appropriate resistance to wear and corrosion. Co-deposition of particles between layers can improve their properties, especially general corrosion and erosion-corrosion behavior by means of nano diamond as reinforcing particles. In this study Ni-P/nano diamond composite deposition were deposited on steel substrate. Structure of the coatings and corrosion resistance of theme were investigated by scanning electron microscopy and corrosion tests in salty media. The composite structure of the deposit was evaluated as nano size without using any surfactants. Also results for the composite coating show better corrosion protection and higher hardness comparing with as -deposited Ni-P. The optimum concentration of diamond nanometer particles were found by evaluation of scanning electron microscopy pictures, hardness measurement, linear polarization and electrochemical impedance spectroscopy results}, Keywords = {nano size, composite deposition, electroless coating}, volume = {11}, Number = {3}, pages = {18-23}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-678-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-678-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Azizi, and Soltanieh,}, title = {STUDY ON NIOBIUM CARBIDE COATING FORMATION ON AISI L2 STEEL USING THERMO-REACTIVE DEPOSITION METHOD}, abstract ={In the present research, to form niobium carbide coating on the surface of AISI L2 steel Thermo-Reactive Deposition method (TRD) in a molten bath was used. Niobium carbide coating treatment was carried out at 1173 K, 1273 K, and 1373 K for 2, 4, and 8 hours. The molten bath contained 20wt.% borax (Na2B4O7), 5 wt.% boric acid (B2O3), and 75 wt.% ferro-niobium. The presence and properties of the coated layer were studied by means of Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD) analysis. The thickness of coating ranged between 6.6 µm to 33µm depending on treatment time, and temperature. The effects of treatment time and temperature on the coating thickness were studied. Kinetic study of the formation of NbC coating showed that growth of the coating is under the control of diffusion. The activation energy of the process was estimated to be 122 kJ/mol. A practical formula to estimate the coating thickness was suggested.}, Keywords = {Surfaces, Thermo-Reactive Deposition, Carbide Coating}, volume = {11}, Number = {3}, pages = {24-31}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-679-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-679-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Fazli, R. and Golestani-Fard, F. and Safaei-Naeini, Y. and Zhang, S.}, title = {EFFECT OF ZrO2 PARTICLE SIZE ON MORPHOLOGY and SYNTHESIS OF NANO CaZrO3Via MOLTEN SALT METHOD}, abstract ={Well crystallized pure calcium zirconate (CaZrO3 ) nanopowder was successfully synthesized using the molten-salt method. CaCl2 , Na 2CO3, micro-ZrO 2and nano-ZrO 2 were used as starting materials. On heating, Na2CO3 reacted with CaCl 2to form NaCl and CaCO 3. Nano CaZrO 3 was formed by reacting equimolar amounts of in situformed CaCO 3 (or CaO) and ZrO 2 in molten Na 2CO3-NaCl eutectic mixture. CaZrO 3 particle size and synthesis temparture was tailored as a function of ZrO 2particle size. Due to the usage of nano-ZrO 2 , the molten salt synthesis (MSS) temperature was decreased and possible impurity phases in the final product were suppressed. The synthesis temperature was lowered to 800°C and soaking time of the optimal synthesis condition was reduced to 3h. After washing with hot-distilled water, the n-ZrO2sample heated at 800°C for 3h, was single phase CaZrO 3with 70-90 nm in particle size, while the m-ZrO 2sample heated at 1000°C for 3h, was single phase CaZrO 3 with 250-400 nm in particle size. Based on the TEM observation and thermodynamic analysis, the synthesized CaZrO 3 grains retained the morphology of the ZrO2 nanopowders, which indicated that a template formation mechanism play a dominant role in synthesis process}, Keywords = {Molten salt method, Nano materials, Calcium zirconate, Template growth}, volume = {11}, Number = {3}, pages = {32-38}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-680-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-680-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Mousavi, E. and Aboutalebi, M. R. and Seyedein, S. H. and Abbasi, S. M.}, title = {INFLUENCE OF CARBON ON THE AGEING BEHAVIOUR OF TI-13V-11CR-3AL}, abstract ={The effect of aging time and temperature on the microstructure and mechanical properties of Ti-13V-11Cr-3Al and Ti-13V-11Cr-3Al-0.2C was studied. The carbon addition increases the rate of age hardening as well as the peak hardness of aged samples. The presence of titanium carbides in Ti-13V-11Cr-3Al-0.2C limits grain growth during the process. The observations in this work are discussed in terms of the effect of the microstructural changes in quenched and aged samples associated with the presence of carbide precipitates}, Keywords = {Ti-13V-11Cr-3Al Alloy, Carbon content, Age Hardening}, volume = {11}, Number = {3}, pages = {40-47}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-681-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-681-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Ahangarkani, and Zangeneh-Madar, and Abbaszadeh, and Rahmani, and Borgi,}, title = {THE EFFECT OF COBALT ADDITIVE ON MICROSTRUCTURE AND PROPERTIES OF W-CU COMPOSITES PREPARED BY SINTERING AND INFILTRATION PROCESSES}, abstract ={In the present paper, the influence of cobalt additive on the sintering/infiltration behavior of W-Cu composite was studied. For this purpose, the mixed powders of tungsten and cobalt were compacted by CIP method and then sintered at 1450, 1550 and 1600 °C in a hydrogen atmosphere. The sintered specimens at 1550 °C were subsequently infiltrated with liquid copper at 1250 °C for 10, 60 and 120 min. The microstructure and composition of samples were evaluated using SEM, EDS as well as XRD techniques. The density of the sintered samples was measured by Archimedes method. Vickers indentation test was used to measurement hardness. It was found that sintering mechanism of tungsten powder depends on temperature and cobalt additive content. Also, the best infiltration behavior was observed in the samples with optimum cobalt value. In addition, it was found that the W-W contiguity as well as dihedral angle decreases as cobalt increases. Density and hardness of infiltrated specimens are attained 16.28-16.79 g.cm-3 and 220-251 VHN, respectively.}, Keywords = {Co additive, W-Cu composite, Activated sintering, Infiltrated density, Contiguity}, volume = {11}, Number = {3}, pages = {48-57}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-682-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-682-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Abadi, Z. and Bidoki, S. M. and Mottaghitalab, V. and Benvidi, A. and Shams-Nateri, A.}, title = {INKJET DEPOSITED SILVER NANOPARTICLE ELECTRODES}, abstract ={Silver nanoparticles are being given considerable attention because of their interesting properties and potential applications. One such exploitable use is as the major constituent of conductive inks and pastes used for printing various electronic components. This paper presents a novel direct-writing process for fabrication of the first deposited silver nanoparticles (AgNPs) (50-200nm) electrode via a thermal inkjet printer. In this method, AgNPs were chemically deposited by ejection of ascorbic acid and silver nitrate solutions onto different substrates such as paper and textile fabrics. Silver deposited patterns were used as electrodes in different electrochemical experiments and their morphology was also investigated in SEM observations. The highest conductivity of deposited electrodes obtained on paper as the substrate was found to be around 5.54x105 S/m. Inkjet fabricated electrodes exhibited acceptable electrochemical behavior in experiments designed for measuring the concentration of hydrogen peroxide as a fundamental procedure for early determination of glucose. This novel inkjet silver deposition technique is introduced to be considered as a promising method for ultimate single step fabrication of different electrochemical bio-sensors.}, Keywords = {Flexible electrode, Inkjet deposition, Printed biosensor, Silver electrode, Silver nanoparticles}, volume = {11}, Number = {3}, pages = {58-66}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-683-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-683-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Mohammadzadeh, A. and SabahiNamini, A. and Azadbeh, M.}, title = {DENSIFICATION AND MICROSTRUCTURE CHARACTERISTICS OF A PREALLOYED ALPHA BRASS POWDER PROCESSED BY LIQUID PHASE SINTERING}, abstract ={The rapidly solidified prealloyed alpha brass powder with a size range of 40 to 100 μm produced by water atomization process was consolidated using liquid phase sintering process. The relationships between sintering temperature, physic-mechanical properties and microstructural characteristics were investigated. Maximum densification was obtained at 930 °C, under 600 MPa compacting pressure, with 60 min holding time. The microstructure of the sintered brass was influenced by dezincification and structural coarsening during supersolidus liquid phase sintering. As a consequence of Kirkendall effect atomic motion between Cu and Zn atoms caused to dezincification at the grain boundaries and formation of ZnO particles on the pore surfaces. It was concluded that microstructural analysis is in a well agreement with obtained physical and mechanical properties. Also, the amount of liquid phase, which depends on sintering temperature, results in different load bearing cross section areas, and it affects the type of fracture morphologies.}, Keywords = {Cu-20Zn alloy, Supersolidus liquid phase sintering, Densification and Coarsening}, volume = {11}, Number = {3}, pages = {67-74}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-684-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-684-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Safabinesh, H. and ArabFatideh, A. and Navidirad, M. and GhassemiKakroudi, M.}, title = {THE EFFECT OF CRYOLITE NA3ALF6 AND SODIUM FLUORIDE NAF ON THE CORROSION AND WETTING BY MOLTEN AL-SI ALLOY OF ANDALUSITE BASED REFRACTORIES}, abstract ={In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, alkaline fluoride NaF and cryolite Na3AlF6 powders were studied. Both physical and chemical properties are known to influence wetting and corrosion behavior. This paper devoted to determine the influence of alkaline fluoride and cryolite added to andalusite based castable on the reaction with aluminum alloys. These additives led to the in-situ formation of celsian phases within the refractory matrix that led to improved corrosion resistance at 1300°C. Phase analysis revealed that celsian formation suppressed the formation of mullite within refractories, thereby reducing Penetration}, Keywords = {Aluminosilicate based refractories, molten aluminum, corrosion non-wetting chemical additives}, volume = {11}, Number = {3}, pages = {75-82}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-685-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-685-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {EftekhariYekta, B and Honarvar, Sh}, title = {EFFECT OF TiO2 ADDITION ON BONDING STRENGTH OF CaO-P2O5 Na2O-TiO2 BIOACTIVE GLASS CERAMIC COATING}, abstract ={The effect of titanium dioxide addition on bonding strength of CaO-P2O5 -Na 2O-TiO2glass-ceramic system was investigated as a coating on titanium substrate. Thus, different amounts of TiO2 (2, 3.5 and 5mol %) were added to the base glass batch composition. The prepared glaze slips were applied on the substrate by dip coating method, dried and then heat treated at various temperatures. After that, bonding strength of the glass- substrates was determined via shear stress testing method. The de-bonded interfaces were analyzed by scanning electron microscopy (SEM). According to these results, the 5 mol% TiO 2 containing coating showed the best bonding strength, comparing with the other coatings. The bioactivity of the coated samples was investigated by soaking them in simulated body fluid (SBF). The surface of the samples was studied using SEM and X-Ray microprobe and it was observed that an apatite layer was grown on their surface}, Keywords = {Titanium, Bioactive Coating, Bonding Strength}, volume = {11}, Number = {4}, pages = {1-7}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-714-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-714-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Parvin, N and DerakhshandehHaghighi, R and Naeimi, M and ParastarNamin, R and Hadavi, M. M.}, title = {EFFECT OF NICKEL AND COBALT ADDITIONS ON INFILTRATION BEHAVIOR, MICROSTRUCTURE AND HARDNESS OF W-AG COMPOSITES}, abstract ={In this research, infiltration behavior of W-Ag composite compacts with Nickel and Cobalt as additives has been investigated. Nickel and Cobalt were added to Tungsten powder by two distinct methods: mixing elementally and reduction of salt solution. The coated Tungsten powders were compacted under controlled pressures to make porous skeleton with 32-37 vol. % porosity. Infiltration process was carried out at 1100 ̊C under a reducing atmosphere for 1h. The effect of additives on infiltration of Ag and density were evaluated by SEM and Archimedes methods. Properties of the specimens were compared following two distinct processes namely: I) sintering simultaneously with infiltration process and II) sintering prior to infiltration (pre-sintering process). It was found that specimens which were pre-sintered and then infiltrated with molten silver represent higher hardness and finer microstructure than the specimens infiltrated simultaneously with sintering.}, Keywords = {Infiltration, W-Ag Composites, Powder Metallurgy, Mixing Elementally, Reduction of Salt Solution}, volume = {11}, Number = {4}, pages = {8-11}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-715-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-715-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Foadian, F and Soltanieh, M and Adeli, M and Etminanbakhsh, M}, title = {THE FORMATION OF TiAl3 DURING HEAT TREATMENT IN EXPLOSIVELY WELDED Ti-Al MULTILAYERS}, abstract ={Metallic-intermetallic laminate (MIL) composites are promising materials for structural applications especially in the aerospace industry. One of the interesting laminate composites is the Ti-TiAl 3 multilayer. In this work, commercially pure sheets of aluminum and titanium with almost equal thickness of around 0.5 mm were explosively joined. The achieved multilayers were annealed at 630 ℃in different times so that an intermetallic layer was formed at the Ti/Al interface. The resulting microstructure was studied by optical and scanning electron microscopy and Energy Dispersive Spectroscopy (EDS). TiAl3 was the only intermetallic phase that was observed in all annealing times. The kinetics of the formation of TiAl 3 was investigated and compared to previous research studies performed on Ti-Al multilayers which were fabricated using methods other than explosive welding.}, Keywords = {Intermetallic, Laminate Composites, TiAl}, volume = {11}, Number = {4}, pages = {12-19}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-716-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-716-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Fattah-alhosseini, A and AsadiAsadabad, M}, title = {PHASE STABILITY AND SEMICONDUCTING BEHAVIOUR OF LOW ACTIVATION AUSTENITIC MN-CR STEELS}, abstract ={Four compositions of austenitic Mn-Cr steels have been developed successfully for in-vessel component materials in power plant industry. The phase stability of these Mn-Cr steels was studied by and X-ray diffraction (XRD) patterns. XRD patterns have shown that the matrix of these Mn-Cr steels is a single γ-phase structure. The potentiodynamic polarisation curves suggested that these fabricated Mn-Cr steels showed passive behaviour in 0.1M H2SO 4solution. Therefore, semiconducting behaviour of passive film formed on these fabricated Mn-Cr steels in 0.1M H2SO 4 solution was evaluated by Mott–Schottky analysis. This analysis revealed that passive films behave as n-type and p-type semiconductors. Based on the Mott–Schottky analysis, it was also shown that donor and acceptor densities are in the order of 1021 cm -3 and are comparable for other austenitic stainless steels in acidic environments}, Keywords = {Low activation, Mn-Cr steel, XRD, Mott–Schottky}, volume = {11}, Number = {4}, pages = {20-27}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-717-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-717-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Ahmadi, S and Shahverdi, H. R.}, title = {DEVELOPMENT OF HARDNESS IN A Fe- BASED NANO-COMPOSITE ALLOY}, abstract ={Achieving extreme hardness in the newly synthetic steel formed by converting from initial amorphous state to subse-quent crystalline structure –named as devitrification process- was studied in this research work. Results of TEM observa-tions and XRD tests showed that crystallized microstructure were made up four different nano-scale phases i.e., α-Fe, Fe 36 Cr12 Mo10 , Fe 3 C and Fe3 B. More, Vickers hardness testing revealed a maximum hardness of 18.6 GPa which is signifi-cantly harder than existing hardmetals. Detailed kinetic and structural studies have been proof that two key factors were contributed to achieve this extreme hardness supersaturation of transition metal alloying elements (especially Nb) and also reduction in the structure to the nano-size crystals.}, Keywords = {Transmission electron microscopy (TEM), Nano composites, X-ray diffraction (XRD)}, volume = {11}, Number = {4}, pages = {28-32}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-718-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-718-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {MohammadiSamani, M. M. and Baharvandi, H. R. and Abdizadeh, H. and Rezapour, J.}, title = {PRESSURELESS SINTERING OF B4C-NANOTiB2 NANOCOMPOSITE BY ADDITION OF Fe AND Ni AS SINTERING AIDS}, abstract ={B4C and its composites with TiB2 as second phase continues to be extensively used as the preferred ceramic material in military applications as armor systems for absorbing and dissipating kinetic energy from high velocity projectiles. It also exhibits a high melting point (2427 °C), and high neutron absorption cross section. Pressureless sintering of the B 4C-nanoTiB2 nanocomposite using small amount of Fe and Ni (≤3 Wt%) as sintering aids was investigated in order to clarify the role of Fe and Ni additions on the mechanical and microstructural properties of B4C-nanoTiB2 nanocomposites. Different amount of Fe and Ni, mainly 1 to 3 Wt% were added to the base material. Pressureless sintering was conducted at 2175, 2225 and 2300 °C. It was found that Addition of 3 Wt% Fe and 3 wt% Ni and sintering at 2300 °C resulted in improving the density of the samples to about 99% of theoretical density. The nanocomposite samples exhibited high density, hardness, and microstructural uniformity.}, Keywords = {B4C, TiB2, Pressureless Sintering, Nanocomposite, Sintering Aid.}, volume = {11}, Number = {4}, pages = {33-39}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-719-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-719-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Sedghi, A. and Vahed, R.}, title = {EFFECT OF FABRICATION PARAMETERS ON SYNTHESIS OF Ti2AlC AND Ti3AlC2MAX PHASES BY MASHS}, abstract ={Mechanically Activated Self-propagating High temperature Synthesis (MASHS) is the method which is used to promote self-propagating synthesis by increasing activity of reactants and increase the purity of products. In this study Ti 2 AlC and Ti3AlC2 max phases were synthesized by using mechanically activated self-propagating high temperature synthesis (MASHS) and samples reactivity and phase structure of samples was studied. This process was performed by combination of short duration ball milling (MA) of reactants (Ti, Al and C as raw materials) and selfpropagating high temperature synthesis (SHS) by microwave or furnace. Mixtures of Ti/Al/C by mole ratio of 2:1:1 and 3:1:2 were milled for 2h., then exothermic reaction was initiated in microwave or high temperature furnace and their reaction behavior and structure have been investigated by DTA and XRD. Results revealed that it’s possible to fabricate these materials by MASHS method but purity of them depends on type of reaction condition. DTA and XRD analyses proved that increasing of soaking time did not improve purity of compounds and some impurities such as TiC would be formed in non-optimized reaction routes.}, Keywords = { MAX phases , MASHS, Ti2}, volume = {11}, Number = {4}, pages = {40-47}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-720-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-720-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Tavighi, K. and Emamy, M. and Emami, A. R.}, title = {EFFECTS OF CU AND SOLUTION HEAT TREATMENT ON THE MICROSTRUCTURE AND HARDNESS OF IN-SITU ALUMINIUM MATRIX COMPOSITE CONTAINING AL4SR PHASE}, abstract ={This study was undertaken to investigate the effects of Cu and solution heat treatment on the microstructure and hardness of cast Al-Al4Sr metal matrix composite. Different amounts of Cu (0.3, 0.5, 1, 3 and 5 wt.%) were added to the composite. Specimens were heat treated at 500 °C for 4 hours followed by water quenching. Microstructural studies were assessed by the use of optical microscope, scanning electron microscope (SEM) and x-ray diffractometry (XRD). The results showed that addition of 5 wt.% Cu reduces the length of large needle-like Al4Sr phase and refines the microstructure. In addition, the presence of Cu-intermetallics increases hardness of the composite. Cu mainly forms θ phase which segregates at the grain boundaries. Heat treatment partially dissolves Cu-intermetallics and homogenizes the distribution of θ phase in the matrix.}, Keywords = {Metal matrix composite (MMC), Microstructure, Intermetallic, Hardness, Heat treatment.}, volume = {11}, Number = {4}, pages = {48-54}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-721-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-721-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Ahmadi, A. and Youzbashi, A. A. and Nozad, A. and Maghsoudipour, A. and Ebadzadeh, T}, title = {TO EVALUATE THE APPLICABILITY OF ALKOXIDE SOL-GEL METHOD IN SYNTHESIS OF YSZ NANOPOWDER THROUGH APPROPRIATE HYDROLYSIS ROUTE}, abstract ={Synthesis of YSZ nanopowder by alkoxide sol-gel method, through two different hydrolysis routes, one under careful control by using acetyacetone as ligand, and the other through basic hydrolysis, was investigated. The synthesized powders were characterized by various analytical techniques such as, XRD, STA, PSA, BET, SEM, and TEM. The results showed that, the YSZ powders prepared through the basic hydrolysis route consist of weakly agglomerated nanosized spherical particles whereas the products obtained through the controlled hydrolysis route, consist of hard irregular shaped agglomerates. Sinterability of these powders was examined at 1480 °C, which showed that the powder synthesized through the basic hydrolysis route attains a density of 94%, against 60% for the other case. It was therefore concluded that, alkoxide sol-gel method through basic hydrolysis route, can be more suitable for the synthesis of YSZ nanopowder and its subsequent sintering.}, Keywords = {Yttria-stabilized zirconia, sol gel, alkoxide, hydrolysis, sintering}, volume = {11}, Number = {4}, pages = {55-62}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-722-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-722-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Badami, E. and Salehi, M. T. and Seyedein, S. H.}, title = {MODELING HIGH TEMPERATURE FLOW BEHAVIOR OF AN AL 6061 ALUMINIUM ALLOY}, abstract ={Hot deformation behavior of a medium Cr/Mn Al6061 aluminum alloy was studied by isothermal compression test at temperatures range of 320 to 480 °C and strain rates range of 0.001 to 0.1 s −1. The true stresstrue strain curves were analyzed to characterize the flow stress of Al6061. Plastic behavior, as a function of both temperature and strain rate for Al6061, was also modeled using a hyperbolic sinusoidal type equation. For different values of material constant α in the range of 0.001 to 0.4, values of A, n and Q were calculated based on mathematical relationships. The best data fit with minimum error was applied to define constitutive equation for the alloy. The predicted results of the proposed model were found to be in reasonable agreement with the experimental results, which could be used to predict the required deformation forces in hot deformation processes}, Keywords = {Al6061 Aluminium Alloy, Hot Deformation, Constitutive Equations.}, volume = {11}, Number = {4}, pages = {63-71}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-723-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-723-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Asadi, S.}, title = {SPREAD DATA ANALYSIS OF ALUMINUM OXIDE SPLATS REINFORCED WITH CARBON NANOTUBES}, abstract ={Coating of a surface by droplet spreading plays an important role in many novas industrial processes, such as plasma spray coating, ink jet printing, nano safeguard coatings and nano self-assembling. Data analysis of nano and micro droplet spreading can be widely used to predict and optimize coating processes. In this article, we want to select the most appropriate statistical distribution for spread data of aluminum oxide splats reinforced with carbon nanotubes. For this purpose a large class of probability models including generalized exponential (GE), Burr X (BX), Weibull (W), Burr III (BIII) distributions are fitted to data. The performance of the distributions are estimated using several statistical criteria, namely , Akaike Information Criterion (AIC), Baysian Information Criterion (BIC), LogLikelihood (LL) and Kolmogorove-Smirnove distance. Also, the fitted plots of probability distribution function and quantile-quantile (q-q) plots are used to verify the results of different criteria. An important implication of the present study is that the GE distribution function, in contrast to other distributions, may describe more appropriately in these datasets.}, Keywords = {Aluminum oxide, Carbon nanotube, Coating, Model selection criteria, Splat, Spread data, Statistical}, volume = {11}, Number = {4}, pages = {72-79}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-724-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-724-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} } @article{ author = {Kaiser, M. S.}, title = {FRACTIONAL RECRYSTALLIZATION KINETICS IN DIRECTLY COLD ROLLED Al-Mg, Al-Mg-Sc AND Al-Mg-Sc-Zr ALLOY}, abstract ={The evaluation of texture as a function of recrystallization has been characterized for directly cold rolled Al-6Mg, Al-6Mg-0.4Sc and Al-6Mg-0.4Sc-0.2Zr alloys. Samples were annealed isothermally at 400 °C for 1 to 240 minutes to allow recrystallization. Recrystallization kinetics of the alloys is analyzed from the micro-hardness variation. Isothermally annealed samples of aluminum alloys were also studied using JMAK type analysis to see if there exists any correlation between the methods. Recrystallization fraction behavior between two methods the scandium added alloys show the higher variation due to precipitation hardening and higher recrystallization behavior. The scandium and zirconium as a combined shows the more variation due to formation of Al3(Sc, Zr) precipitate. From the microstructure it is also observed that the base Al-Mg alloy attained almost fully re-crystallized state after annealing at 400 °C for 60 minutes}, Keywords = {Al-Mg alloys, annealing, fraction recrystallization, precipitate}, volume = {11}, Number = {4}, pages = {80-87}, publisher = { Iran University of Science & Technology}, title_fa = {}, abstract_fa ={}, keywords_fa = {}, url = {http://ijmse.iust.ac.ir/article-1-725-en.html}, eprint = {http://ijmse.iust.ac.ir/article-1-725-en.pdf}, journal = {Iranian Journal of Materials Science and Engineering}, issn = {1735-0808}, eissn = {2383-3882}, year = {2014} }