7085铝合金热压缩变形的流变应力本构方程  

Flow Stress Constitutive Equation of 7085 Aluminum Alloy during Hot Compression

作　　者：沈耀红[1] 张志清[1] 覃丽禄[1] 黄光杰[1] 刘庆[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料导报》2011年第4期127-130,共4页Materials Reports

基　　金：国家自然科学基金资助项目(50901092);中央高校基本科研业务费资助项目(CDJRC10130008)

摘　　要：采用Glecbc-1500热模拟机对7085铝合金进行热压缩，研究了该合金在应变速率为1～38s^-1、变形温度为260-440℃条件下的流变应力行为。结果表明，7085铝合金流变应力在变形初期随着应变的增加而增大，出现峰值后逐渐趋于平稳；峰值应力随应变速率的增加而增加，随温度的升高而降低；通过线性回归分析计算出7085材料的应变硬化指数n以及变形激活能Q，获得了7085铝合金高温条件下的流变应力本构方程。The flow stress behavior of 7085 aluminum alloy during hot compression deformation was studied by thermal simulation test at the strain rate of 1-38s^-1 and the deformation temperature of 260-440℃ on the Gleebe- 1500 thermal-mechanical similar. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The peak stress increases with increase of strain rate, and decreases with increase of de formation temperature. The flow strain hardening coefficient n and deformation activation energy Q were evaluated by linear regression analysis. And the flow stress constitutive equation of 7085 aluminum alloy during hot compression was obtained.

关 键 词：7085铝合金 热压缩变形 流变应力 动态再结晶 本构方程 

分 类 号：TB301[一般工业技术—材料科学与工程]