Microstructure preparation and hot-deformation of Ti–46.2Al–2.0V–1.0Cr–0.5Ni alloy

In this paper the near gamma microstructure with equiaxed fine grains was prepared in the cast Ti–46.2Al–2.0V–1.0Cr–0.5Ni alloy for the hot-compression tests. It has been found that the lamellar breakdown and segmental coarsening occurred when the cast lamellar microstructure was annealed at 1150°C. These degradation mechanisms resulted in the lamellar spheroidization and microstructure refinement in the studied alloy. This alloy with the prepared near gamma microstructure exhibited relatively good deformability at the temperatures below Te, such as keeping the soundness up to 150% true compressive strain and exhibiting rather low deformation resistance at the moderate strain rates in the isothermal hot-compression tests. Besides, the non-banded microstructure was observed in the deformed specimens.