预应变对轧制镁合金AZ31孪生变形影响的数值研究

Numerical Study on the Effect of Pre-Strain on Detwinning in Rolled Mg Alloy AZ31.

作者信息

Ma Chao, Duan Xing, Guo Xiaoqian, Qiao Hua, Zhang Lianying, Wu Peidong

机构信息

School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221000, China.

School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China.

出版信息

Materials (Basel). 2021 Oct 14;14(20):6069. doi: 10.3390/ma14206069.

DOI:10.3390/ma14206069

PMID:34683657

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8537416/

Abstract

The deformation behavior of rolled Mg alloy AZ31, previously compressed along the rolling direction (RD), was numerically investigated under reverse tension. The EVPSC-TDT model was employed to study the effect of pre-strain on detwinning for 3%, 6% and 9% pre-compressed materials along the RD. A new criterion was proposed to control the exhaustion of detwinning under reverse tension. Numerical results show good agreement with the corresponding experimental data. It was demonstrated that the proposed criteria can capture the key features associated with detwinning in pre-compressed materials. Regardless of the amount of pre-compression, detwinning is activated under reverse tension, leading to low yield stress and a typical s-shaped flow curve. The inflection point reflects the exhaustion of detwinning, which is delayed when increasing the amount of pre-compression.

摘要

对先前沿轧制方向（RD）压缩的轧制镁合金AZ31在反向拉伸下的变形行为进行了数值研究。采用EVPSC-TDT模型研究了沿RD方向预压缩3%、6%和9%的材料中预应变对孪生变形的影响。提出了一个新的准则来控制反向拉伸下孪生变形的耗尽。数值结果与相应的实验数据吻合良好。结果表明，所提出的准则能够捕捉与预压缩材料中孪生变形相关的关键特征。无论预压缩量如何，反向拉伸都会激活孪生变形，导致低屈服应力和典型的S形流动曲线。拐点反映了孪生变形的耗尽，随着预压缩量的增加，拐点会延迟出现。