铜铝复合接触线用银铜合金高温流变应力行为研究  

Flow Stress Behaviors of Cu-Ag Alloy Copper Contact Wire During High Temperature

作　　者：赵鸿金[1] 巢洁[1] 周军[1] 姜科[1] 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《热加工工艺》2015年第24期75-78,81,共5页Hot Working Technology

基　　金：国家高技术研究发展计划(863)资助项目(2006AA03Z531);江西省科技支撑计划项目(2007年)

摘　　要：采用Gleeble-1500热模拟试验机研究了银铜合金在变形温度700~950℃、应变速率0.01~10 s^(-1)条件下的高温流变应力特性,绘制出了真应力-真应变曲线;分析了变形温度及应变速率对高温流变应力的影响。通过线性回归法分析了银铜合金的形变激活能,并获得该银铜合金的高温流变应力本构方程。结果表明:银铜合金在热压缩变形过程中发生了明显的动态回复与再结晶。随变形温度与应变速率的不同,其主要动态软化机制不同。在高温低应变情况下,软化效果较佳。试验所得流变应力与预测值误差大约在5%。The high temperature flow stress behaviors of Cu-Ag alloy were investigated at 700-950℃ and strain rate of 0.01-10 s^-1 on Gleeble-1500 thermo-simulation machine and the true stress-true swain curve was drawn out. The influences of deformation temperature and strain rate on the high temperature flow stress were analyzed. The deformation activation energy for Cu-Ag alloy was analyzed by linear regression method and the high-temperature flow stress constitutive equation was obtained. The results show that the dynamic recover and dynamic recrystallization occurs obviously during hot compression of Cu-Ag alloy. Under different deformation temperature and strain rate, the main dynamic softening mechanism is different. At high temperature and low strain condition, the softening effect is better. The maximum relative error between predicted and experimental result is about 5%.

关 键 词：银铜合金 流变应力 激活能 软化机制 

分 类 号：TG146.1[一般工业技术—材料科学与工程]