(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: 在Gleeble-1500D熱模擬試驗機上，通過高溫等溫壓縮試驗，對Cu-Cr-Zr-Ce合金在應(yīng)變速率為0.01~5 s-1、變形溫度為600~800 ℃的組織轉(zhuǎn)變以及動態(tài)再結(jié)晶行為進行了研究。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。同時從流變應(yīng)力、應(yīng)變速率和溫度的相關(guān)性，得出了該合金高溫?zé)釅嚎s變形時的熱變形激活能Q為495.8 kJ/mol，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)動態(tài)材料模型計算并分析了該合金的熱加工圖，利用熱加工圖確定熱變形的流變失穩(wěn)區(qū)，并且獲得了試驗參數(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-Ce合金；高溫壓縮；動態(tài)再結(jié)晶；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 and dynamic recrystallization behavior of Cu-Cr-Zr-Ce alloy at 0.01-5 s-1 and 600-800 ℃ were performed on Gleeble-1500D. The results show that the flow stress decreases with the increase of temperature while increases with the increase of strain rate. The hot deformation activation energy Q=495.8 kJ/mol and constitutive equation are obtained from the correlativity of flow stress, strain rate and temperature by stepwise regression analysis. With consideration of the effects of the deformation temperatures and the stain rates, the processing maps are established based on the dynamic material model. The instability zones of flow behavior can be recognized by the plans. 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 are also analyzed by the processing maps.
Key words: Cu-Cr-Zr-Ce alloy; high temperature deformation; dynamic recrystallization; constitutive equation; processing map
