Effect of rolling temperature and post-treatment on microstructure and mechanical properties of AZ31 magnesium alloy

doi:10.13251/j.issn.0254-6051.2023.03.011

Abstract

Abstract: AZ31 magnesium alloy plates were rolled at different temperatures, and the rolled plates were immediately subjected to different post-treatments (water cooling, air cooling and annealing). The effects of rolling temperature and post-treatment on microstructure and mechanical properties of the tested magnesium alloy were investigated. The results show that when rolled at 250 ℃ and 300 ℃, there are a lot of twins in the plates after water cooling and air cooling. When rolled at 350 ℃, the number of twins is small due to the higher rolling temperature, the average grain size after water cooling is smaller than that after air cooling, and the number of twins after air cooling is slightly smaller than that after water cooling. After annealing following the 350 ℃ rolling, the grains tend to be equiaxed and finer with low lattice distortion. At the same rolling temperature, the yield strength, tensile strength and hardness of the rolled alloy plate after water cooling are higher than that of other treatments. After annealing, the elongation of the plates can be significantly increased, but the yield strength and tensile strength are slightly decreased. When the rolling temperature increases, the maximum difference of yield strength and tensile strength between the three post-treatment methods decreases.

Key words: magnesium alloy, rolling, heat treatment, microstructure, mechanical properties

CLC Number:

TG166.4

Song Xianhe, Liu Xiaoye, Bi Rengui, Lu Liwei, Liu Yanfeng, Huan Xihong. Effect of rolling temperature and post-treatment on microstructure and mechanical properties of AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(3): 62-70.

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