【摘要】 利用Gleeble-1500型热模拟试验机对Cu-0.6Cr-0.03Zr合金进行高温热压缩变形,研究了合金在550～750℃变形温度、0.01～5 s^-1应变速率条件下的热压缩变形行为,建立Cu-0.6Cr-0.03Zr合金的热变形本构方程及热加工图。结果表明:Cu-0.6Cr-0.03Zr合金的流变应力随变形温度的升高而减小,随应变速率的增大而增大;Cu-0.6Cr-0.03Zr合金的流变行为可用包含Zener-Hollomon参数的Arrhenius双曲正弦模型来描述,合金的热变形激活能为572.05 kJ/mol;Cu-0.6Cr-0.03Zr合金在高温热压缩变形时存在3个安全加工区,合金最佳热变形参数为变形温度770～800℃、应变速率0.01～0.05 s^-1、功率耗散效率因子32%～40%。更多还原

【Abstract】 The deformation behavior of Cu-0.6Cr-0.03Zr alloy was investigated by compression test on Gleeble-1500 hot-simulation machine in the temperature range of 550-750 ℃ and the strain rate range of 0.01-5 s^-1. The hot deformation constitutive equation and processing map were established. The results show that the flow stress decreases with increasing the deformation temperature and increases with increasing the strain rate. The flow stress behavior is expressed by hyperbolic sine equation containing Zener-Hollomon parameter, and the hot deformation activation energy is calculated as 572.05 kJ/mol under the present experimental condition. There are three safe processing zones for high temperature deformation of the alloy. The optimum domain for hot working occurs at 770-800 ℃ and 0.01-0.05 s^-1, with the efficiency of power dissipation of 32%-40%.更多还原