Dislocation density model of AZ31 magnesium alloy and microstructure prediction of thermal compression

被引：0
|
作者：
Wang J.-Q. [1 ]
Guo L.-L. [1 ]
Wang C.-F. [1 ]
机构：
[1] Continuous Extrusion Engineering Research Center, School of Materials Science and Engineering, Dalian Jiaotong University, Dalian
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2020年 / 30卷 / 01期
基金：
中国国家自然科学基金;
关键词：
AZ31 magnesium alloy; Constitutive model; Dislocation density model; Finite element simulation;
D O I：
10.11817/j.ysxb.1004.0609.2020-37477
中图分类号：
学科分类号：
摘要：
Thermal-mechanical behavior of AZ31 magnesium alloy extruded rod was investigated by thermal compression experiment at the deformation temperatures of 300, 400, 500℃ and the strain rates of 0.1, 0.01, 0.001 s-1. A flow stress constitutive model of the alloy was established based on the regression analysis by the Arrhenius type equation. The activation energy Q is 132.45 kJ/mol and the strain hardening coefficient n is 4.67. According to the dynamic recrystallization (DRX) mechanism of AZ31 magnesium alloy at high temperature deformation, a multi-scale coupled dislocation density model of macroscopic deformation-microstructure of magnesium alloy during high temperature deformation was proposed. The model could reflect the interactions among work hardening, dynamic recovery (DRV), transformation from low angle grain boundaries (LAGB) into high angle grain boundaries (HAGB) and mechanisms during the hot working process. Furthermore, the finite element simulation of the compression process was performed by VUSDFLD subroutines in ABAQUS software. As a result, DRX volume fraction, compression force, and the dislocation density of HAGB and LAGB are obtained. It is obvious that the simulated results are similar to the experimental force. The new proposed dislocation density model of AZ31 magnesium alloy is reasonable. © 2020, Science Press. All right reserved.
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页码：48 / 59
页数：11
相关论文
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