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 degrees C. Massive formation of the wiso phase from the parent (3-phase occurred during annealing without external stress or with stress well below the yield stress. Moreover, a massive alpha phase precipitation takes place under simultaneous annealing and plastic deformation. Plastic deformation plays a key role in (3- alpha transformation and achieving refined alpha + (3 type microstructure resulted in improved mechanical properties. Studying phase transformations during plastic deformation is critical for understanding and optimizing thermomechanical processing of metastable (3-Ti alloys.