Hot deformation behavior of AZ80 Mg alloy

ZHANG Kang; ZHANG Kui; LI Xinggang; LI Yongjun; XU Yulei; ZHANG Kai; MA Minglong; MI Xujun

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Hot deformation behavior of AZ80 Mg alloy
Issue S1, Pages: 236-239(2008)
Published： 2008 ，
DOI：

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[1]张康,张奎,李兴刚,李永军,徐玉磊,张凯,马鸣龙,米绪军.AZ80镁合金热变形行为[J].特种铸造及有色合金,2008(S1):236-239.

ZHANG Kang, ZHANG Kui, LI Xinggang, et al. Hot deformation behavior of AZ80 Mg alloy. [J]. Special Casting & Nonferrous Alloys (S1):236-239(2008)
[1]张康,张奎,李兴刚,李永军,徐玉磊,张凯,马鸣龙,米绪军.AZ80镁合金热变形行为[J].特种铸造及有色合金,2008(S1):236-239. DOI：

ZHANG Kang, ZHANG Kui, LI Xinggang, et al. Hot deformation behavior of AZ80 Mg alloy. [J]. Special Casting & Nonferrous Alloys (S1):236-239(2008) DOI：

摘要

采用圆柱体等温热压缩试验对AZ80镁合金的变形行为进行研究。结果表明

当变形温度为200

50℃

应变速率为0.002

s-1

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;通过线形回归获得了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Zenner-Hollmon参数的关系式。

Abstract

The cylindrical compression test is employed in this paper in order to study the deformation behavior of AZ80 Mg alloy at high temperature. The results show that with the increase of strain rate and the decrease of deformation temperature

the flow stress increases under the circumstance that the range of temperature

strain rate are 200～350 ℃ and 0.002～1 s-1 respectively. The constitutive equation of AZ80 Mg alloy during hot compression is deduced by linear regression analysis. The sensitivity exponent of strain rate increased with the increase of deformation temperature. The value of critical strain for dynamic recrystallization was determined from the strain-stress curves. The equation related to the Zener-Hollomon parameter was obtained too.