Fabrication of a High Performance Ti Alloy Implant for an Artificial Hip Joint

Abstract:

A new fabrication process of a stem for an artificial hip joint has been investigated to improve mechanical properties and to reduce both the fabrication cost and consumption of expensive Ti alloys by swaging and die-forging into near-net-shape at room temperature, followed by local heat treatment and precise machining. In this study metastable Ti-Nb-Sn alloys consisting of non-cytotoxic elements (biocompatible Ti alloys) were used for biomedical applications. It is found that swaging at both ends of a rod before die-forging saves material consumption by approximately 50% in comparison with turning, and enhances subsequent age-hardening. In addition the cold die-forging enables the fabrication costs to decrease. It is suggested that high strength of higher than 1100 MPa in the proximal part connected to a stem head and low Young’s modulus of less than 60 GPa in the distal part implanted in a femur can be obtained simultaneously in advanced Ti alloy stems.

• Periodical: Materials Science Forum (Volumes 620-622)
• Pages: 591-594
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.620-622.591
• Online since: April 2009
• Authors: Taek Kyun Jung, Tadasu Abumiya, Naoya Masahashi, Mok Soon Kim, Shuji Hanada
• Keywords: Artificial Hip Joint, Biocompatible Titanium Alloy, Cold Die-Forging, Strength, Young's Modulus

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