Effect of Fe and Mo additions on microstructure and
mechanical properties of TiAl intermetallics
mechanical properties of TiAl intermetallics
(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: The ductility of TiAl intermetallics can be improved through stabilizing the ductile β phase. New β-stabilized Ti−45Al−xFe−yMo (x, y=1, 2, 3, 4) alloys were designed through adding the β stabilizing elements Fe and Mo. The microstructural evolution and deformation behavior of the Ti−45Al−xFe−yMo alloys were investigated. The results show that the amount of β(B2) phase is increased with the increase of alloying elements. Mo shows a higher capability for stabilizing the β phase than Fe. In the optimized Ti−45Al−3Fe−2Mo alloy, the grains are significantly refined to about 12 μm, and this alloy shows a very good hot ductility at the elevated temperature.
Key words: TiAl intermetallics; Fe; Mo; β phase; grain refinement