Microstructures of TiAl3 intermetallic compound solidified under ultra high pressure
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The phase constitutes and microstructures of TiAl3 intermetallic compound solidified under vacuum and 5.5GPa pressure conditions were investigated. The results show that the phase constitutes of Ti80Al alloy solifified under vacuum and ultra high pressure are the same as those of TiAl3+Al. There are no new phases generated. However, under ultra high pressure solidification, the morphology of TiAl3 changes obviously. The shape of TiAl3 changes from pin-like to massive. Furthermore, Ti content in Al increases under ultra high pressure solidification. Analysis results indicate that the change of microstructure under ultra high pressure is involved in the influence of solute diffusion coefficient, the microstructure and stability of the solid/liquid interface with pressure mainly.
Key words: ultra high pressure； TiAl3 intermetallic compound； solute diffusion coefficient