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Evolution of the Microstructure during Hot Working of Gamma-Based TiAl Alloys

Abstract Cast products of two-phase titanium aluminides suffer from microsegregation of the alloying elements, which arises from the peritectic solidification pathway. The resulting variation in composition and microstructure occurs on a length scale in the range of 1 mm and, thus, cannot be tolerated for the anticipated applications of the materials. A significant structural and chemical consolidation can be achieved by homogenization and hot-working procedures, however, the processing experience is limited. This problem is addressed in the present paper in that the evolution of the microstructure of two-phase alloys after different stages of wrought processing is characterized by structural and chemical microanalysis involving scanning electron microscopy and energy dispersive X-ray analysis. The investigations involve different two-phase alloys in order to assess the effects of ternary and higher alloying elements on the finally obtained microstructure.