Volume 6, Issue 3 (Summer 2009 2009)                   IJMSE 2009, 6(3): 15-20 | Back to browse issues page

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A. Shokuhfar, S. Ahmadi, H. Arabi, S. Nouri. MECHANISMS OFPRECIPITATES FORMATION IN AN Al- Cu- Li-ZrALLOYUSINGDSC TECHNIQUE AND ELECTRICALRESISTANCE MEASUREMENTS. IJMSE 2009; 6 (3) :15-20
URL: http://ijmse.iust.ac.ir/article-1-197-en.html
MECHANISMS OFPRECIPITATES FORMATION IN AN Al- Cu- Li-ZrALLOYUSINGDSC TECHNIQUE AND ELECTRICALRESISTANCE MEASUREMENTS
A. Shokuhfar , S. Ahmadi , H. Arabi , S. Nouri
Abstract:   (34870 Views)
Abstract: Guinier-Preston (GP) zone formation and precipitation behavior of T1 (Al2CuLi) phase during the ageingof an Al-Cu-Li-Zr alloy was studied by differential scanning calorimetry (DSC) technique and electrical resistancemeasurement of the samples. Results show that endothermic effects in the thermograms of the alloy between 180°Cand 240°C can be related to the enthalpy of GPzones dissolution. Formation of GPzones in the structure increasedhardness, tensile strength and electrical resistance of the Al-Cu-Li-Zr alloy. Furthermore, precipitation of T1 phaseoccurred in temperature range of 250ºC to 300ºC whereas its dissolution occurred within the temperature of 450-530ºC. Activation energies for precipitation and dissolution of T1 phase which were determined for the first time inthis research, were 122.1(kJ/mol) and 130.3(kJ/mol) respectively. Results of electrical resistance measurementsshowed that an increase in the aging time resulted in the reduction of electrical resistance of the aged samples.
Keywords: aluminum- lithium alloys, DSC; activation energy, natural aging, Al-Cu-Li-Zr alloy, T1 phase, dissolutionenergies
     
Type of Study: Research Paper | Subject: Ceramics
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