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 

作者机构：Science and Technology on Advanced High TemperatureStructural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第4期

页      面：236-241页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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) 

主　　题：TiAI alloy Powder metallurgy Hotdeformation Flow stress 

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.