The precipitation processes of the γ1 phase in Ti–53Al–18Nb alloys

The microstructures of high-Nb-containing TiAl alloys with a nominal composition of Ti–53Al–18Nb (at.%) having a γ1 + γ phase region were studied. The range of Al and Nb content in which the γ1 phase is able to precipitate has been determined. High Al content and high Nb content favor the precipitation of the γ1 phase in the γ matrix. The distribution and morphology of the γ1 phase in the γ matrix were also studied.