(1. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽 471003；
2. 上海理工大學(xué) 材料科學(xué)與工程學(xué)院，上海 200093)
摘 要: 采用Gleeble-1500D熱模擬試驗機，對Cu-Cr-Zr合金在應(yīng)變速率為0.001~10 s-1、變形溫度為650~850 ℃的高溫變形過程中的變形行為(流變應(yīng)力和顯微組織)進行研究。根據(jù)動態(tài)材料模型計算并分析該合金的熱加工圖，并結(jié)合變形顯微組織觀察確定該合金在實驗條件下的高溫變形機制及加工工藝。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。從流變應(yīng)力、應(yīng)變速率和溫度的相關(guān)性，得出該合金高溫?zé)釅嚎s變形時的熱變形激活能(Q)為392.5 kJ/mol，同時利用逐步回歸的方法建立該合金的流變應(yīng)力方程。利用熱加工圖確定熱變形的流變失穩(wěn)區(qū)，并且獲得了實驗參數(shù)范圍內(nèi)熱變形過程的最佳工藝參數(shù)：溫度范圍為750~850 ℃，應(yīng)變速率范圍為0.001~0.1 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合金；高溫壓縮變形；熱激活能；流變應(yīng)力方程；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）
Abstract:The high temperature deformation behaviors (flow stress and microstructure) of Cu-Cr-Zr alloy were investigated by compressive tests on Gleeble-1500D thermal-mechanical simulating tester in the strain rate range of 0.001-10 s-1 and temperatures range of 650-850 ℃. Based on dynamic materials model, the processing maps were established and analyzed. Combined with the microstructure observation the hot deformation mechanism and process of Cu-Cr-Zr alloy were worked out. The results show that the flow stress decreases with the increase of temperature and increases with the increase of strain rate. The hot deformation activation energy Q=392.5 kJ/mol is obtained and the flow stress constitutive equation is established from the correlativity of flow stress, strain rate and temperature by stepwise regression analysis. The instability zones of flow behavior can be recognized by the processing maps. The optimum processing parameters of hot deformation in the range of this experiment can also be attained by the processing maps，in which the hot temperature range is 750-850 ℃ and the strain rate range is 0.001-0.1 s-1. The hot deformation characteristics and microstructures were also analyzed with the processing maps.
Key words: Cu-Cr-Zr alloy; high temperature deformation; hot deformation activation energy; constitutive equation; processing map
