(1.中南工业大学粉冶所，长沙 410083；
2.郑州轻金属研究院，郑州 450041)
摘 要:
关键字: TiAl基合金 全层片组织 断裂韧性
（1.Powder Metallurgy Research Institute,
Central South University of Technology, Changsha 410083 ;
2.Zhengzhou Light Metal Research Institute, Zhengzhou 450041）
Abstract:The fracture toughness of the fully lamellar TiAl -based alloy was measured with standard specimens at ambient temperature. The process of initiation and extension of crack were in-situ observed with plate and foil specimens in SEM and TEM. The results revealed that the fracture toughness of specimens shows anisotropism depend on the lamellar orientation, the α2 phase lath may hinder the extension of crack and make the crack-tip blunt. Thus, the materials with random lamellar orientation exhibits highest room-temperature fracture toughness.
Key words: TiAl-based alloy fully-lamellar microstructure fracture toughness
