Coarsening of (αTi) + (βTi) Microstructure in the Ti–Al–V Alloy at Constant Temperature

The microstructure evolution of the Ti–6 wt% Al–4 wt% V alloy with increasing annealing time t at constant temperature T = 800 °C is studied. This temperature is in the two‐phase region (αTi) + (βTi) of Ti–Al–V ternary phase diagram. The annealing time t varies from 7 to 840 h. The microstructure of the annealed samples is investigated using optical and scanning electron microscopy. The average grain size of (αTi) and (βTi) phases grows approximately proportional to t 1/4 . This indicates that both processes are controlled by the diffusion along grain boundaries (αTi)/(αTi) and (βTi)/(βTi) and/or interphase boundaries (αTi)/(βTi).