(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽(yáng) 471003；
2. 上海理工大學(xué) 材料科學(xué)與工程學(xué)院，上海 200093；
3. 河南科技大學(xué) 有色金屬共性技術(shù)河南省協(xié)同創(chuàng)新中心，洛陽(yáng) 471003)
摘 要: 在Gleeble-1500D熱模擬試驗(yàn)機(jī)上對(duì)Cu-Cr-Zr-Ag合金進(jìn)行高溫等溫壓縮試驗(yàn)，當(dāng)熱壓縮應(yīng)變速率為0.001~10 s-1、熱變形溫度為650~950 ℃時(shí)，同時(shí)對(duì)合金高溫?zé)釅嚎s的熱加工圖以及變形機(jī)制進(jìn)行研究。結(jié)果表明：流變應(yīng)力隨變形溫度的升高而減小，隨應(yīng)變速率的提高而增大；熱變形過程中的穩(wěn)態(tài)流變應(yīng)力可用雙曲正弦本構(gòu)關(guān)系式來描述，其激活能為Q=343.23 kJ/mol，同時(shí)利用逐步回歸的方法建立了該合金的流變應(yīng)力方程。根據(jù)動(dòng)態(tài)材料模型計(jì)算并分析了合金的熱加工圖，并且獲得了試驗(yàn)參數(shù)范圍內(nèi)熱變形過程的最佳工藝參數(shù)：溫度為750~800 ℃、應(yīng)變速率范圍為0.01~0.1 s-1，并利用熱加工圖分析了該合金不同區(qū)域的高溫變性特征以及組織變化。
關(guān)鍵字: Cu-Cr-Zr-Ag合金；高溫壓縮；動(dòng)態(tài)再結(jié)晶；本構(gòu)方程；熱加工圖
（1. College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. College of Materials Science and Engineering, University of Shanghai for Science and Technology,
Shanghai 200093, China;
3. Collaborative Innovation Center of Nonferrous Metals, Henan Province, Henan University of Science and Technology, Luoyang 471003, China）
Abstract:The high temperature deformation mechanism and hot processing map of Cu-Cr-Zr-Ag alloy were investigated by compressive tests on Gleeble-1500D thermal-mechanical simulating tester in the temperatures range of 650-950 ℃, strain rate range of 0.001-10 s-1. The results show that the flow stress decreases with the increase of temperature, while increases with the increase of strain rate. The flow behavior is described by the hyperbolic sine constitutive equation and the activation energy of the alloy is Q=343.23 kJ/mol. The constitutive equation is obtained by stepwise regression analysis. The processing maps were established based on the dynamic material model. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the plans，in which the hot temperature is 750-800 ℃ and the strain rate is 0.01-0.1 s-1. The hot deformation characteristics and microstructures were also analyzed by the processing maps.
Key words: Cu-Cr-Zr-Ag alloy; high temperature deformation; dynamic recrystallization; constitutive equation; processing map
