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 γ 1  + γ phase region were studied. The range of Al and Nb content in which the γ 1 phase is able to precipitate has been determined. High Al content and high Nb content favor the precipitation of the γ 1 phase in the γ matrix. The distribution and morphology of the γ 1 phase in the γ matrix were also studied.