Effect of β grain size on stress induced martensitic transformation in β solution treated Ti-10V-2Fe-3Al alloy

Grain size in β-solution treated Ti-10V-2Fe-3Al alloy has been shown to have a profound effect on the triggering stress of the stress induced martensitic (SIM) transformation. The triggering stress is shown to increase with increasing β grain size up to a grain size of 300 μm, after which it was found to become constant. Dependence of the triggering stress on β grain size has been explained in terms of the free energy change during such a transformation.