en سایر موضوعات Other subjects Research Paper Research Paper The influence of different heat treatment parameters, namely solutionizing and artificial<br> aging conditions, on the microstructure, mechanical hardness, and corrosion resistance of Al-<br> 12Si-Cu alloy are systematically explored in this work. Solution treatment was performed at<br> two temperatures (500&deg;C and 530&deg;C) and two durations (0.5 and 3 hours), and artificial aging<br> was made at two temperatures (180&deg;C and 310&deg;C) over two durations (2 and 5 hours).<br> Optical microscopy also showed interesting microstructural changes with fine grain<br> refinement and enhanced spheroidization of the coarse eutectic Si phase and a more uniform<br> distribution of primary intermetallic grains. These structural adjustments were identified as<br> direct determinants of properties of the material. Maximum microhardness (155 HV) was<br> achieved at the temperatures of 500&deg;C/3 h solutionizing and 180&deg;C for 5 h aging (S3), which<br> was ascribed to successful solid solution strengthening and fine precipitation hardening. In<br> contrast, the lowest hardness (54 HV) was obtained at the values 530&deg;C/3 h + 310&deg;C/5 h (S8),<br> showing the harmful impact of over-aging at higher temperatures. Analysis of<br> electrochemical corrosion detected a significant correlation between the corrosion resistance<br> and treated microstructure, where conditions favoring microstructural refinement resulted in a<br> decrease in corrosion current density. A Design of Experiments (DOE) method by way of the<br> Taguchi L8 orthogonal array was used to find out how each parameter contributed relative to<br> the other variable. The analysis revealed that, whilst the aging temperature was the most<br> influential factor to the microhardness, the solution time was the controlling factor on the<br> surface roughness. The results demonstrate a robust determination of the main processing<br> windows which are known to be crucial to enhance particular properties and verify the<br> tremendous feasibility of temperature control in heat treatment process optimization in<br> engineering the necessary trade-off between mechanical strength and corrosion performance<br> in Al-12Si-Cu alloys. Al-Si-Cu alloy,heat treatment,aging,corrosion,optimization. 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-6143-1&slc_lang=en&sid=1 asaad eqal asaad.kadhim@stu.edu.iq 1800319475328460022703 1800319475328460022703 Yes Southern Technical University - Amarah Technical Institute Haidar Akram drhaidar3@mtu.edu.iq 1800319475328460022704 1800319475328460022704 No Middle Technical University