(1. 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004；2. 北京航空制造工程研究所，北京 100024)
摘 要: 對(duì)TC21合金的熱變形行為進(jìn)行研究，通過對(duì)該合金變形過程中應(yīng)變速率敏感性指數(shù)m值、熱變形激活能Q、晶粒指數(shù)P的計(jì)算，得出不同應(yīng)變速率和溫度下m值、Q值和P值的變化規(guī)律。在繪制動(dòng)態(tài)DMM模型熱加工圖的同時(shí)構(gòu)建含位錯(cuò)數(shù)量的雙相鈦合金高溫變形機(jī)理圖。應(yīng)用熱加工圖分析TC21合金熱變形工藝，確定加工失穩(wěn)區(qū)以及適合加工區(qū)域。運(yùn)用雙相鈦合金高溫變形機(jī)理圖，根據(jù)不同溫度下TC21合金柏氏矢量補(bǔ)償?shù)木Я３叽纭⒛Ａ垦a(bǔ)償?shù)膽?yīng)力值和位錯(cuò)數(shù)量預(yù)報(bào)該合金的熱變形機(jī)理。
關(guān)鍵字: TC21合金；變形激活能；應(yīng)變速率敏感性指數(shù)；晶粒指數(shù)；加工圖；變形機(jī)理圖
deformation mechanisms of TC21 alloy
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 10024, China）
Abstract:The hot compression deformation of TC21 alloy was investigated. Throngh the calculation of strain rate sensitivity exponent (m), deformation activation energy (Q) and grain size exponent (P) during hot compression deformation, the variations of m, Q and P values at different strain rates and temperatures were obtained. The hot processing map based on the dynamic materials modeling was drawn while the high-temperature deformation mechanism maps incorporating dislocations inside grains were obtained. The processing map was used to analyze the hot deformation behavior and determine the processing instability regime and appropriate processing regimes. Within appropriate processing regime, based on the elevated temperature deformation mechanism maps, the Burgers vector compensated grain size, modulus compensated stress and dislocation quantities of TC21 alloy at different temperatures were calculated to elucidate the hot deformation mechanisms.
Key words: TC21 alloy; deformation activation energy; strain rate sensitivity exponent；grain size exponent; processing map; deformation mechanism map
