Stress-induced phase transformations in Ti-15Mo alloy at elevated temperature

Abstract

Controlled mechanical loading was applied to Ti-15Mo alloy during annealing at 550 ${}^{\circ }$C. Massive formation of the $\ddot{I}{‰}_{\text{iso}}$ phase from the parent ${\hat{I}}^2$-phase occurred during annealing at 550 ${}^{\circ }$C without external stress or with stress well below the yield stress. Moreover, a massive $\hat{I}\pm$ phase precipitation takes place under simultaneous annealing and plastic deformation. Plastic deformation plays a key role in ${\hat{I}}^2\to \hat{I}\pm$ transformation and achieving refined $\hat{I}\pm +{\hat{I}}^2$ type microstructure resulted in improved mechanical properties. Studying phase transformations during plastic deformation is critical for understanding and optimizing thermomechanical processing of metastable ${\hat{I}}^2$-Ti alloys.

Published manuscript (VoR, Materials Letters, Elsevier)