(1. 东北大学 材料与冶金学院， 沈阳 110004；2. 北京航空制造工程研究所，北京 100024)
摘 要: 对TC21合金的热变形行为进行研究，通过对该合金变形过程中应变速率敏感性指数m值、热变形激活能Q、晶粒指数P的计算，得出不同应变速率和温度下m值、Q值和P值的变化规律。在绘制动态DMM模型热加工图的同时构建含位错数量的双相钛合金高温变形机理图。应用热加工图分析TC21合金热变形工艺，确定加工失稳区以及适合加工区域。运用双相钛合金高温变形机理图，根据不同温度下TC21合金柏氏矢量补偿的晶粒尺寸、模量补偿的应力值和位错数量预报该合金的热变形机理。
关键字: TC21合金；变形激活能；应变速率敏感性指数；晶粒指数；加工图；变形机理图
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
