(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)
摘 要: 在Gleeble-1500D熱模擬試驗(yàn)機(jī)上，采用高溫等溫壓縮試驗(yàn)對(duì)Cu-Ni-Si-P-Cr合金在應(yīng)變速率為0.01~5 s-1、變形溫度為600~800 ℃條件下的流變應(yīng)力行為進(jìn)行研究，利用光學(xué)顯微鏡分析合金在熱壓縮過程中的組織演變及動(dòng)態(tài)再結(jié)晶機(jī)制。結(jié)果表明：Cu-Ni-Si-P-Cr合金在熱變形過程中發(fā)生了動(dòng)態(tài)再結(jié)晶，且根據(jù)變形溫度的不同，真應(yīng)力—真應(yīng)變曲線的特征有所不同。流變應(yīng)力隨變形溫度升高而降低，隨應(yīng)變速率提高而增大。從流變應(yīng)力、應(yīng)變速率和溫度的相關(guān)性得出該合金熱壓縮變形時(shí)的熱變形激活能Q和本構(gòu)方程。
關(guān)鍵字: Cu-Ni-Si-P-Cr 合金；熱壓縮變形；流變應(yīng)力；動(dòng)態(tài)再結(jié)晶
（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 Sci）
Abstract:The flow stress behavior of Cu-Ni-Si-P-Cr alloy during hot compression deformation was studied by isothermal compression test at Gleeble-1500D thermal-mechanical simulator under condition of the temperature from 600 ℃ to 800 ℃ and the strain rate from 0.01s-1 to 5 s-1. The microstructure evolution and dynamic recrystallization nucleation mechanisms of Cu-Ni-Si-P-Cr alloy were analyzed. The results show that the dynamic recrystallization occurs during hot compression deformation. The characteristics of the true stress—true strain curve are different when the deformation temperature is different. The flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. Both the hot deformation activation energy Q and constitutive equation are derived from the correlativity of flow stress, strain rate and temperature.
Key words: Cu-Ni-Si-P-Cr alloy; hot compression deformation; flow stress; dynamic recrystallization
