中文摘要：

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。

英文摘要：

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.