Effects of Ta content on Young's modulus and tensile properties of binary Ti-Ta alloys for biomedical applications

The effects of Ta content on the microstructures, dynamic Young's modulus and tensile properties of the quenched Ti-Ta alloys were investigated for biomedical applications. The microstructures were examined using a scanning electron microscopy (SEM) and an X-ray diffraction (XRD) analysis. The results indicate that the microstructures of the quenched binary Ti-Ta alloys are sensitive to Ta content. The Ti-Ta alloys exhibit lamellar HCP martensite (α') structure at a Ta content below 20%, needle-like orthorhombic martensite (α'') structure at a Ta content between 30-50%, metastable β+α'' structure at a Ta content of 60%, and single metastable structure at a Ta content above 60%. The dynamic Young's modulus and tensile properties of the binary Ti-Ta alloys depend strongly on Ta content. Ti-30% Ta and 70% Ta alloys have much lower modulus and a good combination of high strength and low modulus among all the studied Ti-Ta alloys. They have the great potential to become new candidates for biomedical applications