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在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr合金在应变速率为0.001~10 s-1、变形温度为650~850℃的高温变形过程中的流变应力行为进行了研究。利用光学显微镜分析了合金在热变形过程中的组织演变及动态再结晶机制。结果表明:流变应力随变形温度的升高而减小,随应变速率的提高而增大。升高变形温度以及降低应变速率,均有利于Cu-Cr-Zr合金的动态再结晶发生。从流变应力、应变速率和温度的相关性,得出了该合金高温热压缩变形时的热变形激活能Q为392.5 kJ/mol,同时利用逐步回归的方法建立了该合金的流变应力方程。
The flow stress behavior of Cu-Cr-Zr alloy during high temperature deformation with strain rate of 0.001-10 s-1 and deformation temperature of 650-850 ℃ was studied on a Gleeble-1500D thermal simulator. The microstructure evolution and dynamic recrystallization mechanism of the alloy during hot deformation were analyzed by optical microscope. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. Increasing the deformation temperature and reducing the strain rate are conducive to the dynamic recrystallization of Cu-Cr-Zr alloy. Based on the correlation between the flow stress, strain rate and temperature, the hot deformation activation energy (Q) was 392.5 kJ / mol at high temperature, and the flow stress equation of the alloy was established by stepwise regression .