Effect of 0.2%Sn addition on microstructure and mechanical properties of Al-Si-Mg alloy

doi:10.13251/j.issn.0254-6051.2020.04.004

Abstract

Abstract: Effect of 0.2%Sn addition on the microstructures and mechanical properties of Al-Si-Mg alloy with as-cast and T6 heat treated state was studied by optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum analysis (EDS) and tensile testing. The results show that the addition of 0.2%Sn refines the morphology of the eutectic silicon phase and makes the primary α-aluminum grains more uniform, which reduces and improves the morphology and distribution of harmful impurities. At T6 state (solution treatment at 535 ℃ for 6 h+aging at 160 ℃ for 5 h), the proof strength, plastic extension and tensile strength of the alloy reach 262.3 MPa and 305.1 MPa respectively, is increased by 9.8% and 12.4% higher than that of the base alloy without Sn addition, and the elongation is 4.32%, which is increased by 22.6%.

Key words: Sn element, Al-Si-Mg-based aluminum alloy, as-cast microstructure, T6 heat treatment, mechanical properties

CLC Number:

TG166.3

Yin Xin, Yin Dengfeng, Wang Kaixian, Li Jilin, Chi Guoming, Cao Hanquan. Effect of 0.2%Sn addition on microstructure and mechanical properties of Al-Si-Mg alloy[J]. Heat Treatment of Metals, 2020, 45(4): 16-21.

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