Pb-Mg-Al合金的热变形行为与加工图  

Hot deformation behavior and processing map of Pb-Mg-Al alloy

作　　者：段永华[1] 孙勇[1] 何建洪[1] 方东升[1] 郭中正[1] 

机构地区：[1]昆明理工大学材料科学与工程学院云南省新材料制备与加工重点实验室,昆明650093

出　　处：《中国有色金属学报》2013年第2期311-319,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50871049);昆明理工大学引进人才科研启动基金项目(KKSY201251033);昆明理工大学重点实验室开放基金资助项目(ZD2010021D)

摘　　要：采用Gleeble-1500热模拟试验机研究Pb-Mg-Al合金在变形温度453～613 K、应变速率0.01～1 s-1条件下的热压缩流变行为,计算应力指数和变形激活能,采用Zener-Hollomon参数法构建合金的高温变形的本构关系,基于Murty准则,建立Pb-Mg-Al合金的加工图。结果表明:Pb-Mg-Al合金为正应变速率敏感材料;该合金的热压缩变形流变应力行为可用双曲正弦函数本构方程和Zener-Hollomon参数来描述,其平均变形激活能为149.524 4kJ/mol;从加工图分析并结合激活能,确定Pb-Mg-Al合金的最优变形温度和应变速率分别为533 K和0.1 s-1。The flow stress behaviors and the deformation microstructure of hot compressed Pb-Mg-Al alloy were investigated by hot compressive tests on Gleeble-1500 thermo-simulation machine in the temperature range of 453-613 K and strain rates range of 0.01-1 s^-1. The stress exponent and deformation activation at elevated temperatures were calculated. The constitutive relationship of the Pb-Mg-Al alloy during hot compression deformation at high temperatures was obtained by introducing Zener-Hollomon parameter. Based on Murty criterion, the processing map for the Pb-Mg-Al alloy was obtained. The results show that Pb-Mg-Al alloy is sensitive to strain rate. The hot deformation behavior can be described by a constitutive equation in hyperbolic sine function and Zener-Hollomon parameter. The average hot deformation activation energy of Pb-Mg-Al alloy is 149.524 4 kJ/mol. The optimal processing parameters derived from processing map and activation energy are 533 K in temperature and 0.1 s 1 in strain rate.

关 键 词：Pb-Mg-Al合金 本构关系 变形激活能 加工图 

分 类 号：TG301[金属学及工艺—金属压力加工]