AZ31镁合金动态再结晶临界应变和稳态应变  

Critical Strain and Steady Strain of Dynamic Recrystallization in AZ31 Magnesium Alloy

作　　者：王忠堂[1] 刘永哲 梁海成[1] 李艳娟[1] WANG Zhongtang;LIU Yongzhe;LIANG Haicheng;LI Yanjuan(Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159

出　　处：《沈阳理工大学学报》2021年第2期39-43,共5页Journal of Shenyang Ligong University

基　　金：国家自然科学基金资助项目(51575366);辽宁省教育厅资助项目(LG202010)。

摘　　要：采用热拉伸实验测定AZ31镁合金的应力-应变曲线,依据加工硬化率理论,得到热变形过程中AZ31镁合金发生动态再结晶的临界应变和稳态应变,确定临界应变、稳态应变与塑性变形工艺参数的关系。结果表明:热变形温度和应变速率是影响AZ31镁合金动态再结晶的主要因素,提高变形温度和降低应变速率都有利于降低AZ31镁合金的临界应变和稳态应变;AZ31镁合金的动态再结晶临界应变值与Sellars经验模型的参数范围一致。The critical strain and steady strain of dynamic recrystallization of AZ31 magnesium alloy during thermal deformation are determined based on the theory of work hardening rate and the stress-strain curve of material.The relationship models of critical strain,and steady strain with plastic deformation process parameters are established.The results show that the critical strain and steady strain of AZ31 magnesium alloy are obviously affected by hot deformation temperature and strain rate.With the increase of deformation temperature and the decrease of strain rate,the critical strain and steady strain of AZ31 magnesium alloy reduce.The critical strain of dynamic recrystallization of AZ31 magnesium alloy determined by the work hardening rate theory is consistent with the parameter range of Sellars empirical model.

关 键 词：AZ31 镁合金 加工硬化率 动态再结晶 临界应变 

分 类 号：TG301[金属学及工艺—金属压力加工]