7B50铝合金热压缩变形行为与预测  

Hot compressive deformation behavior and flow stress prediction of 7B50 aluminum alloy

作　　者：隆平[1] 潘清林[2] 周坚[2] 陈艳[1] 焦建雄[1] 施丽丽[1] 

机构地区：[1]湖南化工职业技术学院,湖南株洲412004 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《轻金属》2014年第1期51-54,共4页Light Metals

基　　金：湖南省教育厅科学研究项目(课题编号:11C0461)

摘　　要：在变形温度为573K^733K,应变速率为0.001s-1~1s-1的条件下,采用Gleeble-1500热模拟试验机对7B50铝合金的热变形加工行为进行了研究。结果表明,7B50铝合金在热压缩变形中的流变应力随着温度的升高而减小,随着应变速率的增大而增大;建立了一个包含应变的流变应力预测模型,模型中的9个独立参数可以通过非线性最小二乘法拟合求得,预测的流变应力曲线与试验结果吻合得较好。The flow stress behavior of 7B50 aluminum alloy was investigated at the temperatures from 573 K to 733 K and strain rates from 0. 001 to 1 S - 1 on Gleeble - 1500 thermal simulator. A method to predict flow stress considering the effect of true strain was presented in this work. The results show that the flow stress decreases with increasing deforming temperature and increases with increasing strain rate. Flow stress model is expressed by 9 independent parameters and key are obtained by least square method the predicted stress - strain curves are in good agreement with experimental results, which con- firmed that the developed model can give an accurate and precise estimate of the flow stress for 7B50 aluminum alloy.

关 键 词：7B50铝合金 热压缩变形行为 峰值流变应力 

分 类 号：TG146.21[一般工业技术—材料科学与工程]