(1. 南昌航空大学 材料科学与工程学院，南昌 330063；
2. 南京航空航天大学 材料科学与技术学院，南京 210016；
3. 北京航空材料研究院，北京100095)
摘 要:
利用基于Murty准则的加工图技术研究具有粗片层α的TC11合金在α+β两相区的热态变形行为。结果表明，基于Murty准则的加工图技术能较好地预测流动失稳区域和反映耗散能量的变形机制和微观组织。通过加工图分析和微观组织观察得到，流动失稳区域为750~
关键字: TC11合金；Murty准则；加工图；热变形；变形机制；流动失稳
（1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Institute of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The hot deformation behavior of TC11 alloy with thick lamellar α was investigated by the approach of processing map based on Murty criterion. The results show that the approach of processing map based on Murty criterion can predict flow instability zones and exhibit deformation mechanisms and microstructures dissipating energy well. By analyzing the processing map and observing microstructures, the flow instability zones are in the ranges of 750−880 ℃, 0.007−10.0 /s and 880−950 ℃, 0.2−10.0 /s, and the manifestations of flow instability are macro cracking, adiabatic shear bands and prior β boundary cavities. The preferable ranges for hot working are in the ranges of 770−900 ℃, 0.001−0.005 /s and 900−950 ℃, 0.001−0.03 /s. In this two ranges, the globularization of lamellar α operates and globularization of lamellar α along with α+β→β phase transformation operates, respectively. For forging of TC11 alloy, the optimum temperature can be selected between 850 ℃ and 950 ℃ in light of the need of α phase content, and the optimum stain rate is 0.001 /s.
Key words: TC11 alloy; Murty criterion; processing map; hot deformation; deformation mechanism; flow instability
