(1. 河南科技大學 材料科學與工程學院，洛陽 471003；
2. 河南科技大學 有色金屬共性技術(shù)河南省協(xié)同創(chuàng)新中心，洛陽 471003；
3. 上海理工大學 材料科學與工程學院，上海 200093)
摘 要: 在Gleeble-1500D熱模擬試驗機上對Cu-Cr-Zr-Nd合金進行熱壓縮實驗，對合金在應變速率分別為0.001、0.01、0.1、1、10 s-1，變形溫度分別為650、750、850、900、950 ℃的高溫變形過程中的流變應力行為、熱變形過程中的組織演變和動態(tài)再結(jié)晶機制進行研究。結(jié)果表明：流變應力隨變形溫度的升高而減小，隨應變速率的提高而增大。Cu-Cr-Zr-Nd合金在熱變形過程中的動態(tài)再結(jié)晶機制受變形溫度和應變速率的影響。當溫度為900 ℃、應變速率為10 s-1時，Cu-Cr-Zr-Nd合金發(fā)生完全的動態(tài)再結(jié)晶。從流變應力、應變速率和溫度的相關性，得出該合金高溫熱壓縮變形時的熱變形激活能Q為404.84 kJ/mol，同時利用逐步回歸的方法建立該合金的流變應力方程。
關鍵字: Cu-Cr-Zr-Nd合金；高溫壓縮；流變應力方程；熱激活能；動態(tài)再結(jié)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
