Phase Transformations in Ti-Nb-Zr-Ta-O Beta Titanium Alloys with High Oxygen and Reduced Nb and Ta Content

Abstract

Beta titanium alloys possess some attractive properties for use in load-bearing biomedical implants of large body joints. Namely high strength combined with low Young's modulus, biocompatibility and corrosion resistance.

Recently developed alloy Ti-35Nb-6Ta-7Zr-0.7O (wt.%) with high content of strengthening oxygen shows high strength of 1000 MPa and Young's modulus of 80 GPa. By reducing content of beta stabilizing elements (Nb, Ta), the high strength of 1000 MPa is preserved due to oxygen strengthening and Young's modulus is lowered, reaching value of approx. 60 GPa in Ti-29Nb-7Zr-0.7O (wt.%).