摘要
采用GLEEBLE-1500热/力模拟机在变形温度为423～723K,应变速率为0.01～10s-1,最大变形量为60%的条件下对铸态AZ31镁合金进行热/力模拟研究,并结合热变形后显微组织,分析合金力学性能与显微组织之间的关系。研究结果表明:应变速率和变形温度是影响变形激活能的关键参数;当变形温度一定时,流变应力和应变速率之间呈线性关系,合金的变形激活能在523～573K时变化不大,而在大于573K时增大较快,可用包含Arrheniues项的参数Z描述AZ31镁合金热压缩变形的流变应力行为。
Using GLEEBLE-1500 thermo-mechanical simulator, the stress-strain behavior of as-cast AZ31 magnesium alloy at various strain rates and different deformation temperatures were investigated with maximum strain of 60%. The relation between microstructure and mechanical property of the experimental alloy was analyzed in hot-compression procedure. The experimental results show that the strain rate and the deformation temperature are the key parameters of deformation activation energy. When the deformation temperature is definite, the relation between flow stress and strain rate is liner, and the variation of deformation activation energy of experimental alloy is not big in 523-573 K, but the deformation activation energy increases rapidly above 573 K. The relation of peak flow stress, strain rate and temperature can be described with parameter Z which contains Arrheniues item.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期216-220,共5页
Journal of Central South University:Science and Technology
基金
"十一五"国家科技支撑计划项目(2006BAE04B2-3)
关键词
AZ31镁合金
热模拟
流变应力
AZ31 magnesium alloy
hot-compression simulation
flow stress
