(1. 河南科技大学 材料科学与工程学院，洛阳 471003；
2. 河南科技大学 有色金属共性技术河南省协同创新中心，洛阳 471003；
3. 上海理工大学 材料科学与工程学院，上海 200093)
摘 要: 在Gleeble-1500D热模拟试验机上对Cu-Cr-Zr-Nd合金进行热压缩实验，对合金在应变速率分别为0.001、0.01、0.1、1、10 s-1，变形温度分别为650、750、850、900、950 ℃的高温变形过程中的流变应力行为、热变形过程中的组织演变和动态再结晶机制进行研究。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。Cu-Cr-Zr-Nd合金在热变形过程中的动态再结晶机制受变形温度和应变速率的影响。当温度为900 ℃、应变速率为10 s-1时，Cu-Cr-Zr-Nd合金发生完全的动态再结晶。从流变应力、应变速率和温度的相关性，得出该合金高温热压缩变形时的热变形激活能Q为404.84 kJ/mol，同时利用逐步回归的方法建立该合金的流变应力方程。
关键字: Cu-Cr-Zr-Nd合金；高温压缩；流变应力方程；热激活能；动态再结晶
（1. College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Luoyang 471003, China;
3. College of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China）
Abstract:The high temperature deformation behavior, microstructure evolution and dynamic recrystallization nucleation mechanisms of Cu-Cr-Zr-Nd alloy were investigated by compressive tests using Gleeble-1500D thermal-mechanical simulating tester at the deformation temperatures of 650, 750, 850, 900, 950 ℃ and strain rates of 0.001, 0.01, 0.1, 1, 10 s-1. The results show that the flow stress decreases with the increase of temperature, and the flow stress increases with the increase of strain rate. The dynamic recrystallization process of Cu-Cr-Zr-Nd alloy is controlled by deformation temperature and strain rate. The dynamic recrystallization is complete when the temperature and strain rate are 900 ℃ and 10 s-1, respectively. The hot deformation activation energy Q is 404.84 kJ/mol and constitutive equation is obtained from the correlativity of flow stress, strain rate and temperature by stepwise regression analysis.
Key words: Cu-Cr-Zr-Nd alloy; high temperature compression; constitutive equation; hot deformation activation energy; dynamic recrystallization
