Research on Solution and Aging Process of Microstructure and Properties of A357 Cast Alloy
Author of the article:WU Kaiwei;YONG Xuechao;ZHOU Xiying;WANG Fuxin;LI Shaowei
Author's Workplace：College of Materials Engineering,Shanghai University of Engineering Sciences,Shanghai 201620,China
Key Words：A357 casting alloy solution artificial aging microstructure
Abstract：
The effects of solution and aging process on the microstructure and properties of A357 aluminum alloy were studied by means of optical microscope(OM)and scanning electron microscope(SEM).The results show that the microstructure of A357 cast aluminum alloy is composed ofα-Al matrix,eutectic silicon and Mg2Si phase.After solid solution at 540℃×4 h and aging treatment at 145℃×4 h,eutectic silicon is more round and uniform,eutectic silicon and Mg2Si phases are uniformly dispersed at the grain boundary ofα-Al matrix,and the tensile property is greatly improved,so that the performance of A357 aluminum alloy casting reach the expected requirements.The optimal heat treatment process of A357 cast aluminum alloy is:solid solution treatment:(540±3)℃×4 h;Aging treatment:(145±5)℃×4 h.
