TRIP near-alpha titanium alloy and preparation method and application thereof

Abstract

The invention provides a TRIP near-alpha titanium alloy and a preparation method and application thereof, and belongs to the technical field of titanium alloys. The microstructure of the titanium alloy comprises the alpha phase and the metastable beta phase, the alpha phase has a few slippage systems and is high in dislocation blocking capacity, and it can be guaranteed that the alloy has high yield strength by limiting the proportion of the alpha phase and the metastable beta phase; the broken alpha phase keeps high dislocation density, the fine metastable beta phase increases the number of grain boundaries, the critical shear stress required by the TRIP effect is improved, and the yield strength is improved; in the deformation process of the alloy, the metastable beta phase generates stress to induce phase transformation of alpha-phase martensite, a small amount of fine alpha-phase stress induces twin crystals, dynamic grain refinement of an alloy matrix is caused, and the average free path of dislocation is reduced; the double-phase induction mechanism generates a strong dynamic Hall-Eupe effect, so that the alloy has an excellent work hardening rate while keeping high strength.

Images