AZ80镁合金热变形本构方程  

Constitutive Equation of Stress-strain for AZ80 Magnesium Alloy at Thermal Deformation

作　　者：王琪 王忠堂[1] 安玉良[1] WANG Qi;WANG Zhongtang;AN Yuliang(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

出　　处：《沈阳理工大学学报》2019年第5期1-5,84,共6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(LG201701)

摘　　要：在变形温度为533~683K,应变速率为0.001~10s-1条件下,采用热拉伸实验方法测试AZ80镁合金的真实应力-应变曲线,分析应力-应变曲线的变化规律及AZ80镁合金热变形时的微观组织变化规律。结果表明,在一定变形温度条件下,应变速率越高,动态再结晶发生的越充分,再结晶晶粒尺寸越小;在应变速率为0.01s^-1时,随着变形温度升高,动态再结晶程度提高;依据Arrhenius本构方程形式,确定适合于AZ80镁合金热变形的本构关系模型,该本构关系模型的相对误差小于18.5%。The curves of true stress-strain of AZ80 magnesium alloy are tested by thermal tensile test,under the condition that the ranges of temperature is 533~683K and strain rates is 0.001~10s^-1.The variation law of stress-strain curve is analyzed.Microstructure changes of AZ80 magnesium alloy during hot deformation are analyzed.At a certain deformation temperature,the higher the strain rate,the more sufficient the dynamic recrystallization oc-curs,and the smaller the recrystallized grain size is.When the strain rate is 0.01s^-1,the de-gree of dynamic recrystallization increases with the rise of deformation temperature.Accord-ing to the Arrhenius equation,the equation of stress-strain for AZ80 magnesium alloy at thermal deformation is determined,and the relative errors between calculation results by the model and experiment results are less than 18.5%.

关 键 词：AZ80 镁合金 本构方程 流动应力 热变形 

分 类 号：TG301[金属学及工艺—金属压力加工]