Hot deformation behavior and microstructural evolution of powder metallurgical TiAl alloy  

作　　者：Na Liu Zhou Li Wen-Yong Xu Yue Wang Guo-Qing Zhang Hua Yuan 

机构地区：[1]Science and Technology on Advanced High TemperatureStructural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

出　　处：《Rare Metals》2017年第4期236-241,共6页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51301157 and 51105102);the National High Technology Research and Development Program (No. 2013AA031103)

摘　　要：The hot deformation behavior of powder met- allurgical （PM） TiAI alloys was investigated on Gleeble- 3500 thermomechanical simulator, at a temperature range of 1050-1200 ℃ with an interval of 50℃ and a strain rate range of 0.001-1.000 s-1. The results show that the flow stress of PM TiAI alloy is sensitive to deformation tem- perature and strain rate, the peak stress decreases with the increase in deformation temperature and decrease in strain rate, and dynamic recrystallization occurs during the hot compression. The deformation active energy was calcu- lated and the flow stress model during high-temperature deformation was established based on the Arrhenius equations and Zener-Hollomon parameter. The deformed microstructure consists of refined homogeneous γ and α2/γ grains.The hot deformation behavior of powder met- allurgical （PM） TiAI alloys was investigated on Gleeble- 3500 thermomechanical simulator, at a temperature range of 1050-1200 ℃ with an interval of 50℃ and a strain rate range of 0.001-1.000 s-1. The results show that the flow stress of PM TiAI alloy is sensitive to deformation tem- perature and strain rate, the peak stress decreases with the increase in deformation temperature and decrease in strain rate, and dynamic recrystallization occurs during the hot compression. The deformation active energy was calcu- lated and the flow stress model during high-temperature deformation was established based on the Arrhenius equations and Zener-Hollomon parameter. The deformed microstructure consists of refined homogeneous γ and α2/γ grains.

关 键 词：TiAI alloy Powder metallurgy Hotdeformation Flow stress 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TQ323.4[金属学及工艺—金属材料]