Effect of solution treatment process on microstructure and hardness of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy

doi:10.13251/j.issn.0254-6051.2021.03.016

Abstract

Abstract: Effects of different solution treatment processes on microstructure and mechanical properties of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy were studied by means of DSC, OM, SEM, and TEM. The results show that, after solid solution treatment the microstructure of the alloy consists of α-Mg matrix, Mg₁₂Zn(Gd,Y) phase and phases rich in rare earth. With the increase of holding time, the regular striated LPSO phase is precipitated in the matrix when the tested alloy solution treated at 490 ℃, which plays an important role in second phase strengthening and remarkably improves the microhardness of the tested material. The optimum solution treatment process of the alloy is 490 ℃×13 h, at which the highest average microhardness of the tested alloy can reach 77 HV0.2.

Key words: Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy, solution treatment, microstructure, hardness

CLC Number:

TG166.4

Wu Xiaobao, Zhang Xing, Zhang Jinlu. Effect of solution treatment process on microstructure and hardness of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy[J]. Heat Treatment of Metals, 2021, 46(3): 80-85.

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