AZ80镁合金热变形行为研究  

Hot Deformation Behavior of AZ80 Magnesium Alloy

作　　者：张康[1] 张奎[1] 李兴刚[1] 李永军[1] 张凯[1] 马鸣龙[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室

出　　处：《特种铸造及有色合金》2009年第5期480-483,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA03Z503)

摘　　要：采用圆柱体等温热压缩试验对AZ80镁合金的热变形行为进行研究。结果表明,当变形温度为200～350℃、应变速率为2×10-3～1s-1时,随着应变速率的增加和变形温度的降低,合金的流变应力增加;通过线性回归获得了AZ80镁合金高温条件下的流变应力本构方程,发现应变速率敏感指数m随着温度的升高呈上升趋势;同时采用力学方法直接从流变曲线确定了AZ80镁合金发生动态再结晶的临界应变量,并回归出临界应变量与Z参数的关系式。The hot deformation behavior of AZ80 magnesium alloy at high temperature was investigated by cylindrical isothermal compression tests.The results indicate that flow stress of the alloy is increased with increasing in strain rate and decreasing in temperature at 200～350℃ in case of 2×10-3～1 s-1.The constitutive equation for flow stress during hot compression is deduced by linear regression analysis,which shows that the sensitivity exponent of strain rate is increased with the increase of deformation temperature.Meanwhile,value of critical strain for dynamic recrystallization is determined by the strain-stress curves based on the kinetics.The equation related to the Zener-Hollomon parameters is given too.

关 键 词：AZ80镁合金 本构方程 应变敏感性指数 临界应变量 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG376.2[金属学及工艺—金属材料]