Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy

doi:10.13251/j.issn.0254-6051.2022.04.005

Abstract

Abstract: Effect of alloy composition on microstructure and properties of five kinds of Al-Mg-Si alloys was investigated by using universal tensile testing machine, SEM, TEM, etc. The results show that the microstructure, mechanical properties and conductivity of the five alloys are strongly depended on the Mg and Si contents. With increase of Mg and Si contents, the tensile strength of the alloy increases, whereas the conductivity tends to decrease. Although the total atoms of Mg and Si are equal for the Al-0.7Mg-0.5Si and Al-0.6Mg-0.6Si alloys, the different ratios of Mg to Si between the two alloys lead to distinct microstructure, so causing obvious difference in their performance. The Ce-microalloyed Al-0.7Mg-0.6Si-0.2Ce alloy aged at 175 ℃ for 4 h exhibits a good combination between mechanical properties and electrical properties, the tensile strength is up to 325 MPa, and the electrical conductivity is 56.2%IACS.

Key words: Al-Mg-Si alloy, microstructure, mechanical properties, electrical conductivity

CLC Number:

TG244.2

Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, Han Yu, Pan Xuedong, Zhang Lei, Chen Suhong. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy[J]. Heat Treatment of Metals, 2022, 47(4): 30-38.

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