Phase transition induced high strength and large ductility of a hot rolled near β Ti-5Al-5Mo-5V-1Cr-1Fe alloy

Abstract In this work, mechanical properties and phase transformation of a near-beta Ti-5Al-5Mo-5V-1Cr-1Fe alloy subjected to hot rolling deformation were investigated. Detailed transmission electron microscopy characterizations indicated that beta to alpha phase transformation occurred during hot rolling process, accompanied by the variant selection of the alpha precipitates. In addition, the hexagonal close-packed structure to face-centered cubic structure transformation was also observed inside the alpha phase near the alpha/beta interface. The relationship between the phase transformations and the mechanical properties of the alloy was systematically discussed. This work provides a new strategy to design strong and ductile Ti alloys.