Fabrication of biological Ti-based alloy by pulse current sintering and its mechanical properties

Abstract

In this study, the fabrication conditions of Ti-29Nb-13Ta-4.6Zr (TNTZ) alloy by pulse-current sintering and the properties of the alloy were investigated experimentally. The sintering was performed at various temperatures in a vacuum, and then the solution treatment was carried out in Ar gas atmosphere. Finally the aging treatment was carried out. As a result, the alloy sintered at 1473 K or more was showed almost full density. The microstructure of the as-sintered alloy became almost β-phase by solution treatment. The tensile strength and elongation of the solution-treated alloy were 578 MPa and 25.6 %, respectively. The Young's modulus was around 55 GPa and was similar to that of the wrought alloy. It was found that α-phase and β-phase exist at aging temperature of 723 K more than 100 ks. The hardness of the aged alloy is much higher than that of the wrought alloy.