摘要
文章通过对AZ80镁合金在不同变形温度和应变速率下的压缩实验,研究了其高温变形力学行为。讨论了中、高应变速率变形条件下,变形过程中试样温升对流变应力的影响,并进行了修正。将修正后的流变应力应用于合金挤压变形过程的数值模拟。结果表明,模拟挤压变形力与实测值接近,说明修正后的流变应力能很好地反映材料的变形力学行为。
In the present study, hot compression tests of AZ80 magnesium alloy were performed on Gleeble 3500 at strain rates between 0.01s ^-150～s^-1 and deformation temperatures between 300℃～450℃. It was found that the flow stress increases with the decreasing of deformation temperature and increasing of strain rate. With the increasing of strain rate, deformation heating became more pronounced. Thus a correction of flow stress for deformation heating at medium/high strain rates was carried out. The corrected flow stress was introduced to a numerical simulation of hot extrusion process. Good agreements between the predicted and measured values in extrusion pressure were achieved.
出处
《塑性工程学报》
EI
CAS
CSCD
北大核心
2008年第2期96-99,共4页
Journal of Plasticity Engineering
基金
教育部新世纪优秀人才计划资助项目(20062148183)。
关键词
流变应力
应变速率
变形热
数值仿真
flow stress
strain rate
deformation heating
numerical simulation
