Transactions of Materials and Heat Treatment

Title：Prediction model on microstructure for as-extruded magnesium alloy in thermal compression

Authors： Ding Xiaofeng Kuai Yulong Hu Jianhua Shuang Yuanhua

Unit： Taiyuan University of Science and Technology

KeyWords： magnesium alloy thermal compression dynamic recrystallization critical strain microstructure prediction model

ClassificationCode：TG335.71

year,vol(issue):pagenumber：2022,47(2):199-206

Abstract：

Under the conditions of the deformation temperatures of 250-450 ℃ and the strain rates of 0.005-5 s-1, the flow stress-strain curves were obtained by thermal simulation compression experiment, and the thermal deformation and dynamic recrystallization behavior of as-extruded magnesium alloy were investigated. The results show that the critical strain of dynamic recrystallization for AZ31 magnesium alloy decreases with the increasing of deformation temperature or the decreasing of strain rate, and the activation energy required for dynamic recrystallization in the initial deformation of magnesium alloy is 191.2 kJ·mol-1. Based on the regression analysis of experimental data, the dynamic recrystallization critical strain model of AZ31 magnesium alloy was established, and the ratio of dynamic recrystallization critical strain to peak strain in the rheological flow stress curve was about 0.57. Furthermore, the dynamic recrystallization kinetics model of magnesium alloy was established by Avrami equation to predict the critical strain value of dynamic recrystallization for magnesium alloy, which was consistent with the results of microstructure experiments. Thus, the correctness of the model was verified, and the model could predict dynamic recrystallization in the hot working of AZ31 magnesium alloy.

Funds：

山西省优秀来晋博士人员科研资助(20202002)；山西省高校科技创新项目(2019L0626)；太原科技大学科研启动金(20182043)；山西省科技重大专项(20191102009)

作者简介：丁小凤（1987-），女，博士，副教授，E-mail：dingxiaofeng@tyust.edu.cn

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