摘要
利用GPL-1500热模拟试验机对Al-6.2Zn-2.3Mg-2.3Cu合金在不同温度和不同应变速率条件下进行高温压缩试验,得到压缩真应力-应变曲线,并得出该合金的变形激活能和流变应力-应变方程。结果表明,变形温度和应变速率的变化对流变应力的影响明显,流变应力随变形温度的提高而显著降低,随应变速率的提高而增加。该合金高温变形过程的流变应力可用Zener-Hollomon参数(Z)描述;用双曲正弦函数修正的Arrhenius关系表示的流变应力方程为.ε·=1.282×100[sin(0.010σ)]4.9145exp(-134157/RT)。
The high temperature compression tests of Al-6.2Zn-2.3Mg-2.3Cu aluminum alloy at different temperature and strain rate were carried out on GPL-1500 thermal simulation testing machine. The true stress-strain curves are obtained. The equation of deformation activation energy and flow stress-strain is worked out. The results show that the flow stress is influenced by deformation temperature and strain rate obviously; the flow stress decreases greatly with increasing of temperature and increases with increasing of strain rate. The flow stress of this aluminum alloy during high temperature deformation can be described by Zener- hollomon parameter（Z）. The flow stress equation of Arrhenius relation modified by hyperbolic sine function is ε = 1. 282 ×10^0[ sin（0. 010σ） ]4 9145exp（ - 134157/RT）.
出处
《轻合金加工技术》
CAS
北大核心
2011年第11期64-71,共8页
Light Alloy Fabrication Technology
关键词
铝合金
热压缩变形
流变应力
显微组织
激活能
aluminum alloy
hot compression deformation
flow stress
microstructure
activation energy
