Hot compression mechanical behavior and microstructure of Al-Mg-Si alloy with different heat treatment

doi:10.13251/j.issn.0254-6051.2021.02.030

Abstract

Abstract: High temperature compression test of the Al-Mg-Si alloy with different heat treatment state was carried out by Gleeble-3500 thermal simulation test machine. The hot deformation behavior of the solid solution treated and aged alloy was studied under the condition of deformation temperature of 100-400 ℃ with strain rate of 0.01 s^-1. The results show that the alloy mainly undergoes two stages of strain hardening stage and steady-state deformation stage. The flow stress decreases with the increase of compression temperature, and at the same deformation temperature, the flow stress of aged alloy is higher than that of solid solution treated alloy. With the increase of deformation temperature, the flow stress difference between the solid solution treated and aged alloy becomes smaller and smaller. During the process of deformation, a large number of dislocation structures are produced in the alloy. And because the dispersedly distributed precipitated phase pins dislocation, the dislocation distribution of the aged alloy is more uniform, and the deformation resistance is larger. With the increase of deformation temperature, the dislocation density decreases, and the main mechanism of softening is dynamic recovery.

Key words: Al-Mg-Si alloy, solid solution and aging, hot compression, mechanical properties, microstructure

CLC Number:

TG146.2

Liu Wei, Liu Wei, Zou Wenjie, Wu Yuanzhi, Deng Bin, Liu Anmin, Ye Tuo. Hot compression mechanical behavior and microstructure of Al-Mg-Si alloy with different heat treatment[J]. Heat Treatment of Metals, 2021, 46(2): 168-172.

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