1. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083, China
TiAl intermetallic have broad application prospects in aerospace and automotive fields because of their low density, excellent high temperature strength and high temperature creep resistance. However, the traditional TiAl alloy has more stringent requirements for the equipment in hot processing,forming and other aspects, hinder its further development in industrial applications. In order to improve the overall workability, TNM alloy, β solidified, with nominal composition Ti-43.5Al-4Nb-1Mo-0.1B (at%) was successfully designed and selected by alloy design, which is an ideal deformed TiAl alloy at present. The alloy not only has excellent machining properties, but also takes into account the performance objectives of strength, plasticity,fracture toughness and creep resistance. The research progress of TNM alloy design concept, microstructure evolution law, microalloying process,heat treatment process, room temperature and high temperature performance and practical application are summarized briefly，andthe future development of alloys are prospected.