Grain refining of TiAl alloy by rapid deformation

Grain refining of TiAl intermetallics by rapid deformation was investigated. The as-cast TiAl alloy has very large grains and serious composition segregation. Most of the large grains of TiAl alloy can be refined after the first rapid deformation and heat treatment. However, a few of the coarse grains of TiAl still remained. When the second rapid deformation and heat treatment was conducted, all of the remaining coarse TiAl grains can be refined. As the grains were refined, the properties of TiAl alloy were significantly improved.