铸态ZnAl10Cu2合金热变形本构方程  

Constitutive equation of hot deformation for casting ZnAl10Cu2 alloy

作　　者：邬小萍[1] 李德富[1] 郭胜利[1] 许晓庆[1] 贺金宇[1] 胡捷[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《锻压技术》2011年第1期119-123,135,共6页Forging & Stamping Technology

基　　金：十一五国家科技支撑计划(2009BAE71B03)

摘　　要：在Gleeble-3500热模拟机上采用等温压缩实验研究了ZnAl10Cu2合金在温度为210～300℃、应变速率为10-2～10 s-1条件下的热变形行为,获得了该合金热变形过程中的真应力-应变曲线。结果表明:ZnAl10Cu2合金的峰值流变应力随温度升高而降低,随应变速率的提高而增大。通过双曲正弦模型确定了该合金的高温材料常数,Q=144.161 kJ/mol,n=4.443,A=4.7×1012s-1,α=0.01037 MPa-1,并采用修正的Kumar模型建立了考虑应变对流变应力影响的高温本构关系,其拟合度为9.14%。The hot deformation behavior of ZnAl10Cu2 alloy at strain rate ranging from 0.01 to 10.0 s-1 and deformation temperature ranging from 210 to 300 ℃ was studied by isothermal compression performed on a Gleeble-3500 simulated machine.The true stress-true strain curves of ZnAl10Cu2 alloy were obtained.The results show that the peak flow stress decreases with increasing temperature and increases with increasing strain rate.High temperature material constants were obtained using the hyperbolic-sine mathematics model,Q=144.161 kJ·mol-1,n=4.443,A=4.7×1012 s-1,α=0.01037MPa-1,and established the hot deformation constitutive relationship considering the effects of strain on flow stress by using modified Kumar model,the goodness of fit was 9.14%.

关 键 词：ZnAl10Cu2合金 热变形 Kumar模型 热变形激活能 

分 类 号：TG136.1[一般工业技术—材料科学与工程]