Change in microstructures and mechanical properties of biomedical Ti-Nb-Ta-Zr system alloy through cross-rolling

Abstract

The microstructures and mechanical properties of Ti-35Nb-2Ta-3Zr alloy, which was fabricated by vacuum consumable are melting furnace followed by hot pressing, subjected to cross-rolling were investigated in this study. Shear slip and stress-induced α″ martensite phase transformation play an important role in the plastic deformation. Hundred nanometers-sized grains are obtained, when the alloy is cross-rolled at a reduction ratio of 99%. The cross-rolled alloy exhibits considerable low Young's modulus (around 48 GPa) and high ultimate tensile strength (around 880MPa) accompanying with ductile fracture. For Ti-35Nb-2Ta-3Zr alloy cross-rolled at a reduction ratio of 60%, excellent isotropy of mechanical properties along different directions of specimens are obtained. © 2008 The Japan Institute of Metals.