Abstract
The β grain growth behavior of two newly developed titanium alloys with composition Ti-10V-1Fe-3Al and Ti-10V-2Cr-3Al (wt.%) isothermally annealed at 900 °C for a different time was studied, and its effect on the triggering stress of stress-induced martensitic (SIM) transformation and related mechanical properties was evaluated. The results show that the grain size increases with the increase of annealing time. The measured grain size of Ti-10V-1Fe-3Al alloy is larger than that of Ti-10V-2Cr-3Al alloy under the same annealing conditions. The increase of the grain size leads to an increase of the triggering stress resulting in the martensitic transformation. The work hardening ability and compressive failure strain of the studied alloys decrease rapidly.

Key words
titanium alloy, grain size, phase transformation, mechanical properties

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