Influence of Exposure at 750℃ on Room Temperature Tensile Ductility of Cast TiAl Alloy with the Directional Lamellar Microstructure
in this study,based on cast Ti-47.5Al-2.5V-1.0Cr (at.%) alloy with the directional lamellar microstructure,the influence of exposure at 750℃ in air on room temperature tensile ductility was investigated as a function of time,ranging from1hr to 300hr,in order to determine the onset exposure time for a significant reduction in RT ductility and the fracture mechanism for the exposed specimens.The results indicated that this alloy could still retain more than 2.0% of its ductility after exposure at 750℃ for 150hr,and its ductility decreased to 1.58% and ~1.0% even after exposure for 200hr and 300hr,respectively.High ductility for the directional lamellar microstructure could be retained after exposure for 150hr,which was attributed to its high crack origination and propagation resistance at specific lamellar orientation.And the fracture mechanism of the exposed specimen with this special structure would also be discussed.
Titanium aluminide Thermal exposure Ductility Directional lamellar microstructure Fracture mechanism
Chunlei Zhu Xiwen Zhang Ji Zhang
Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron & Steel Research Institute, Xueyuan Nanlu No.76, Beijing, 100081, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
115-123
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）