Overview of the Low-cycle Fatigue Failure Mechanism of TiAl Alloy
Author of the article:LUOQingsong1, XIANG Henggao1, WEI Daixiu1, YIN Yajun2, QI Zhixiang1, ZHENG Gong1, XUHao1, ZHOUBing1
Author's Workplace：1. State Key Laboratory of Advanced Casting Technologies, MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China; 2. School of Materials Science and Engineering, State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Key Words：TiAl alloy; low-cycle fatigue; lamella orientation; dislocation; twin; failure mechanism
Abstract：
TiAl alloys have excellent specific strength and high-temperature microstructure stability and are widely used in
the aerospace field. With the increasing demand for stable and reliable aircraft engine operation in social development, the
low-cycle fatigue performance and failure mechanism of TiAl alloys are receiving increasing attention. This study
summarizes the research on low-cycle fatigue of TiAl alloys over the past 30 years, including the influence mechanism of
strain range, temperature, alloy composition, microstructure type, layer orientation, and microdeformation on the low-cycle
fatigue behavior of TiAl alloys. The effects of the interaction between the test conditions and the TiAl alloy microstructure
on the fatigue failure behavior are emphasized.
