Abstract
The elemental powder metallurgy (EPM) process is used to prepare TiAl-base intermetallics. An EPM process conducted by two-stage solid-state hot pressing was employed to prepare TiAl-base intermetallics and to investigate the resulting microstructural changes. The results showed that the TiAl3 phase forms in the first stage. During the temperature increase to the second sintering stage, lamellar phases start to precipitate in the TiAl3 matrix. Further, the TiAl3 phase transforms to TiAl, and Ti3Al layers develop in the remaining titanium particles. Meanwhile, the lamellar phases grow into ring-type structures between the TiAl matrix and the Ti3 Al layers. After the second stage, the remaining titanium particles are fully reacted, and a microstructure of Ti3Al phases enclosed by fine-grained lamellar rings in the TiAl matrix is developed.
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