Transactions of Materials and Heat Treatment

Title：Influence of solution time on microstructure and properties for A357 alloy with Sr/Ce complex modification

Authors： Wang Bo Li Qing Liu Rangxian Chen Shengqian

Unit： Zhangjiajie Institute of Aeronautical Engineering Guangzhou College of Technology and Business

KeyWords： A357 alloy solution time Mg2Si eutectic silicon iron-rich phase

ClassificationCode：TG292

year,vol(issue):pagenumber：2022,47(8):200-207

Abstract：

The microstructure and properties of A357 alloy with Sr/Ce complex modification under different solution time were studied by metallurgical microscope, scanning electron microscope, tensile testing machine and microhardness tester, and the evolution process of the second phase characteristics and their effects on the properties of the alloy were discussed. The research results show that the area fractions of eutectic silicon and Mg2Si both decrease significantly after T6 heat treatment and show a trend of first decrease and then increase with the extending of solution time. However, the equivalent diameter of eutectic silicon increases with the extending of solution time, and the corresponding shape factor gradually increases. The tensile strength, yield strength and microhardness of the alloy are significantly improved, but the elongation is greatly reduced. With the extending of solution time, the strength and microhardness of the alloy show a trend of first increase and then decrease, while the elongation gradually decreases. When the solution time is four hours, the residual Mg2Si content in the alloy is the least, the size of eutectic silicon is smaller and the sphericity is higher, and the comprehensive mechanical properties of the alloy are the best. The tensile strength, yield strength, elongation and microhardness of the alloy reach 350 MPa, 290 MPa, 6.5% and 125 HV, respectively.

Funds：

湖南省自然科学基金资助项目（2020JJ7074）；广东省金属强韧化技术与应用重点实验室开放课题

作者简介：王波（1987-），女，硕士，副教授，E-mail：zjjlalawww@126.com

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