Microstructures of TiAI₃ intermetallic compound solidified under ultra high pressure

The phase constitutes and microstructures of TiAl₃ intcrmetallic compound solidified under vacuum and 5. 5 GPa 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.