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 p repared in the cast Ti-46.2Al-2.0V-1.0Cr-0.5Ni alloy for the hot-compressio n tests. It has been found that the lamellar breakdown and segmental coarse ning occurred when the cast lamellar microstructure was annealed at 1150 de grees C. These degradation mechanisms resulted in the lamellar spheroidizat ion and microstructure refinement in the studied alloy. This alloy with the prepared near gamma microstructure exhibited relatively good deformability at the temperatures below T-e, such as keeping the soundness up to 150% tr ue compressive strain and exhibiting rather low deformation resistance at t he moderate strain rates in the isothermal hot-compression tests. Besides, the non-banded microstructure was observed in the deformed specimens. (C) 2 000 Elsevier Science Ltd. All rights reserved.