Effect of multi-cycle closed die compression on microstructure and wear resistance of AZ31 alloy with different Si contents

doi:10.13251/j.issn.0254-6051.2024.05.006

Abstract

Abstract: AZ31-2%Si alloy was prepared by adding Si to the AZ31 melt. AZ31 and AZ31-2%Si alloy were processed by multi-cycle closed die compression at high temperature, and the microstructure and wear resistance were studied. The results show that the as-cast AZ31 alloy is composed of Mg and Mg₁₇Al₁₂, while the as-cast AZ31-2%Si alloy is composed of Mg, Mg₁₇Al₁₂ and Mg₂Si. After five cycles compression at 400 ℃, grain of the AZ31 alloy is transformed from coarse equiaxed grain to fine recrystallized grain and Mg₁₇Al₁₂ phase is dissolved, and the vast majority of Mg₁₇Al₁₂ phase in the AZ31-2%Si alloy is dissolved into the matrix, the coarse Mg₂Si phase is broken into fine particles and dispersed around grain boundaries. After sliding friction for 2500 m, the wear loss of the as-cast and five cycles compressed AZ31 alloy is 26.4 mg and 22.1 mg, respectively. The wear loss of the as-cast and five cycles compressed AZ31-2%Si alloy is 22.7 mg and 21.0 mg, respectively. The main factor for improving of wear resistance of the AZ31 alloy after compression is grain refinement. The main factors for improving of wear resistance of the AZ31-2%Si alloy after compression are grain refinement, Mg₂Si phase refinement and its dispersive distribution.

Key words: Mg alloy, closed die compression, microstructure, Mg₂Si phase, wear resistance

CLC Number:

TG306

Guo Wei, Guan Bo, Chen Wei, Wu Dan. Effect of multi-cycle closed die compression on microstructure and wear resistance of AZ31 alloy with different Si contents[J]. Heat Treatment of Metals, 2024, 49(5): 36-39.

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