(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽 471023；
2. 河南科技大學(xué) 河南省有色金屬共性技術(shù)河南省協(xié)同創(chuàng)新中心，洛陽 471023；
3. 河南科技大學(xué) 河南省有色金屬材料科學(xué)與加工技術(shù)重點實驗室，洛陽 471023)
摘 要: 利用Gleeble-1500型熱模擬試驗機對Cu-0.6Cr-0.03Zr合金進(jìn)行高溫?zé)釅嚎s變形，研究了合金在550~ 750 ℃變形溫度、0.01~5 s-1應(yīng)變速率條件下的熱壓縮變形行為，建立Cu-0.6Cr-0.03Zr合金的熱變形本構(gòu)方程及熱加工圖。結(jié)果表明：Cu-0.6Cr-0.03Zr合金的流變應(yīng)力隨變形溫度的升高而減小，隨應(yīng)變速率的增大而增大；Cu-0.6Cr-0.03Zr合金的流變行為可用包含Zener-Hollomon參數(shù)的Arrhenius雙曲正弦模型來描述，合金的熱變形激活能為572.05 kJ/mol；Cu-0.6Cr-0.03Zr合金在高溫?zé)釅嚎s變形時存在3個安全加工區(qū)，合金最佳熱變形參數(shù)為變形溫度770~800 ℃、應(yīng)變速率0.01~0.05 s-1、功率耗散效率因子32%~40%。
關(guān)鍵字: Cu-Cr-Zr合金；熱變形行為；本構(gòu)方程；熱加工圖
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;
2. Henan Province Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Luoyang 471023, China;
3. Henan Key Laboratory of Non-ferrous Materials Science and Processing Technology, Henan University of Science and Technology, Luoyang 471023, China）
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%.
Key words: Cu-Cr-Zr alloy; hot deformation behavior; constitutive equation; processing map
