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200~350℃,应变速率为0.002~1s-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。
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 ...
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第S1期236-239,共4页
Special Casting & Nonferrous Alloys
基金
国家重点基础研究发展计划资助项目(2007CB613705)
国家高技术研究发展计划资助项目(2006AA03Z503)
关键词
AZ80镁合金
本构方程
应变敏感性指数
临界应变量
AZ80 Mg alloy
constitutive equation
sensitivity exponent of strain rate
critical strain
