Effect of a two-step solution heat treatment on the microstructure and mechanical properties of 332 aluminium silicon cast alloy

• Main Authors: Mohamed Ariff, Azmah Hanim, Chang, S. Chuan, Chuan, O. Khang
• Format: Article
• Language: English
• Published: Elsevier 2011
• Online Access: http://psasir.upm.edu.my/id/eprint/22946/1/Effect%20of%20a%20two-step%20solution%20heat%20treatment%20on%20the%20microstructure%20and%20mechanical%20properties%20of%20332%20aluminium%20silicon%20cast%20alloy.pdf; http://psasir.upm.edu.my/id/eprint/22946/; http://www.sciencedirect.com/science/article/pii/S0261306910007685

This paper investigated the effect of a two-step solution heat treatment on the mechanical properties and silicon-rich phase of 332 aluminium alloy. Traditional single-step T6 solution treatment (495 °C/6 h) increased the hardness value of the alloy by 5.96%, increased the tensile strength by 20.42% and reduced the elongation by 3.97%. Two-step solution treatment of the alloy (495 °C/2 h followed by 515 °C/4 h) increased the hardness value by 6.64%, increased the tensile strength by 16.01%, and reduced the elongation by 4.67% compared to the as-cast samples. Both solution treatments were followed by hot water quenching (75–90 °C) and artificial aging at 250 °C for 4 h. The difference in mechanical properties after heat treatment can be linked to the refinement and the spheroidisation of the silicon-rich phase in the alloy.