AZ80镁合金热变形行为研究

张康; 张奎; 李兴刚; 李永军; 张凯; 马鸣龙

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AZ80镁合金热变形行为研究
Hot Deformation Behavior of AZ80 Magnesium Alloy
2009年29卷第5期页码：480-483
纸质出版日期： 2009 ，
DOI：

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[1]张康,张奎,李兴刚,李永军,张凯,马鸣龙.AZ80镁合金热变形行为研究[J].特种铸造及有色合金,2009,29(05):480-483+392.

Zhang Kang, Zhang Kui, Li Xinggang, et al. Hot Deformation Behavior of AZ80 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2009,29(5):480-483.
[1]张康,张奎,李兴刚,李永军,张凯,马鸣龙.AZ80镁合金热变形行为研究[J].特种铸造及有色合金,2009,29(05):480-483+392. DOI：

Zhang Kang, Zhang Kui, Li Xinggang, et al. Hot Deformation Behavior of AZ80 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2009,29(5):480-483. DOI：

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。

Abstract

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.