摘要
采用Gleeble-1500热模拟试验机进行压缩实验,研究Mg-5.3Zn-0.8Zr镁合金在变形温度为473～723K、应变速率为0.01～1.00s-1的变形行为。分析合金流变应力与应变速率、变形温度之间的关系,计算高温(573～723K)下合金变形时的应力指数和变形激活能,并采用Zener-Hollomon参数法构建该合金高温塑性变形的本构关系。研究结果表明:在实验变形条件范围内,合金的真应力-真应变曲线为动态再结晶型;在573～723K,应力指数随着变形温度升高而增加,而且增加的幅度逐渐增大,变形激活能随着变形温度和应变速率的改变而发生变化。
The hot deformation behavior of a Mg-5.3Zn-0.8Zr magnesium alloy was investigated by hot compressive tests on Gleeble-1500 thermal simulation test machine at 473-723 K and at the strain rates of 0.01-1.00 s^-1. The relationships of flow stress, strain rate and deformation temperature were analyzed, the stress exponent and the deformation activation energy at elevated temperatures （573-723K） were calculated. The constitutive equation of the plastic deformation of Mg-5.3Zn-0.8Zr alloy at elevated temperatures （573-723K） was obtained by introducing Zener-Hollomon parameter. The results show that the true stress-strain curves of the alloy have dynamic recrystallization character under the present deformation conditions; within the range from 573 K to 723 K temperature, the stress exponent increases with the increase of deformation temperature and the increment increases gradually. The deformation activation energy changes with the deformation temperature and strain rate.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第1期123-128,共6页
Journal of Central South University:Science and Technology
基金
湖南省科技攻关项目(04GK1008-2)
关键词
塑性变形
热模拟
动态再结晶
镁合金
plastic deformation
thermal simulation
dynamic recrystallization
magnesium alloy
