7075铝合金热压缩动态软化行为的本构模型  

Constitutive Model of Dynamic Softening Behavior of 7075 Aluminum Alloy during Hot Compression

作　　者：权国政[1] 刘克威[1] 王凤彪[1] 宋涛[1] 周一俊[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《机械工程材料》2010年第10期82-86,共5页Materials For Mechanical Engineering

基　　金：国家科技部技术创新基金资助项目(07C26215110824);重庆市重大科技攻关项目(cstc2009aa3012-1);重庆大学大型仪器设备开放基金资助项目

摘　　要：在应变速率为0.01～10 s-1、温度为250～450℃的条件下,采用Gleeble-1500型热模拟试验机对7075铝合金进行了高温热压缩试验,得出其变形过程中的真应力-真应变曲线;通过拟合回归分析得出了该合金高温变形过程中的本构模型并对其应变行为进行了预测。结果表明:在峰值应力之前,Fields-Backofen本构模型预测值与试验值比较吻合;在加入软化因子之后,模型的预测值更接近试验值。Hot compression tests of 7075 aluminum alloy were performed on Gleeble-1500 thermal simulater at strain rate of 0. 01--10 s-1 and deformation temperature of 250--450℃. The true stress-true strain curves during the deformation process were obtained. The constitutive model of the alloy during deformation at high temperatures was obtained through fitting regression and the strain behavior was predicted. The results show that the simulation results of the Fields＇-Backofen constitutive model agreed well with the test values before the peak value of the flow stress, while the predicted values of the model which contained a softening factor were closer to the test values.

关 键 词：7075铝合金 热压缩 流变应力 本构模型 

分 类 号：TB301[一般工业技术—材料科学与工程]