Transactions of Materials and Heat Treatment

Title：Accurate characterization on inelastic recovery for deformation magnesium alloy

Authors： Yang Chong1 2 Zhao Hui1 2 Zhu Guoguo1 2 Peng Yan1 2 Shi Baodong1 2

Unit：

KeyWords：

ClassificationCode：TG386

year,vol(issue):pagenumber：2021,46(9):85-89

Abstract：

Compared with FCC and BCC metals, a large inelastic recovery strain is produced after unloading for magnesium alloy with HCP structure, which is the key factor restricting the springback prediction accuracy of magnesium alloy sheet. The results show that both Chord modulus and Yoshida2020 models are invalid to predict the inelastic recovery strain of AZ31 deformation magnesium alloy sheet after unloading. In order to accurately predict the inelastic recovery of magnesium alloy, a stress dependent variable elastic modulus model was proposed by introducing a stress factor and exponential function, that is SDE (Stress Dependent Exponential) model. Compared with the experimental results, the model accurately calculated the unloading mechanical response of wrought magnesium alloy, and the inelastic recovery after unloading made the residual strain less than the residual strain after linear elastic unloading. Then, the residual strain after uniaxial tensile unloading with constant modulus and stress dependent variable elastic modulus was simulated by finite element software. The results show that the maximum residual strain value after unloading with constant modulus is 1.08%, and the maximum residual strain value after unloading with variable modulus is 0.94%.

Funds：

国家自然科学基金资助项目（51771166）；河北省杰出青年基金资助项目（E2019203452）；河北省高层次人才资助项目（A202002002）；华中科技大学材料成形与模具技术国家重点实验室（P2020-013）；河北省研究生创新资助项目（CXZZBS2020053）

杨冲（1993-），男，博士研究生 E-mail：1750796646@qq.com 通信作者：石宝东（1982-），男，博士，教授 E-mail： baodong.shi@ysu.edu.cn

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