Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl alloys

doi:10.13251/j.issn.0254-6051.2024.11.039

Abstract

Abstract: Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl (x=0, 1, 2, 3) alloys with different Al contents was studied by using XRD, OM, SEM, hardness test and tensile test. The results indicate that the as-cast Mg-6Sn-3Zn alloy is composed of α-Mg equiaxed dendrites and Mg₂Sn phase. The addition of Al element causes grain refinement of the as-cast alloy, and the Mg_x(ZnAl)_1-x quasicrystal phase is formed in the alloy. After 320 ℃×3 h+430 ℃×24 h solution treatment, the Mg_x(ZnAl)_1-x quasicrystal phase in the Mg-6Sn-3Zn-xAl alloy is completely dissolved, while the Mg₂Sn phase is mostly dissolved but has a small amount of residue. The aging hardening curve shows that during the aging process at 200 ℃, the Mg-6Sn-3Zn-xAl alloys all reach peak when aged for 216 h, and a large number of dispersed Mg₂Sn phases are precipitated in the peak aged alloy. The addition of Al element brings a certain strengthening effect, and both solution treatment and aging treatment improve the mechanical properties of the alloy to a certain extent. The improvement of mechanical properties of the alloy comes from the contribution of refined crystalline strengthening, solution strengthening and precipitation strengthening, respectively.

Key words: Mg-6Sn-3Zn-xAl alloy, heat treatment, microstructure, mechanical properties

CLC Number:

TG146.22

Du Jiabei, Zhang Yang, Lu Yalin. Effect of heat treatment on microstructure and mechanical properties of Mg-6Sn-3Zn-xAl alloys[J]. Heat Treatment of Metals, 2024, 49(11): 256-261.

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