Medical titanium alloy

Titanium is non-toxic, light, high strength and has excellent biocompatibility, and is a very ideal medical metal material, which can be used as implants for human body. At present, Ti-6Al-4v ELI alloy is still widely used in the medical field. However, the latter will precipitate extremely small amounts of vanadium and aluminum ions, which reduces its cellular adaptability and may cause harm to the human body, which has already aroused widespread concern in the medical community. As early as the mid-1980s, the United States began to develop aluminum-free, vanadium-free, biocompatible titanium alloys for use in orthopedics. Japan, the United Kingdom and so on have also done a lot of research work in this area, and made some new progress. For example, Japan has developed a series of α+β titanium alloys with excellent biocompatibility, Including Ti-15Zr-4Nb-4Ta-0.2Pd, Ti-15Zr-4Nb-aTa-0.2Pd-0.20~0.05N, Ti-15Sn-4Nb-2Ta-0.2Pd and Ti-15SN-4Nb-2Ta-0.2Pd-0.20, The corrosion strength, fatigue strength and corrosion resistance of these alloys are superior to Ti-6Al-4v ELI. Compared with α+β titanium alloy, β titanium alloy has higher strength, better incision performance and toughness, and is more suitable for implantation in the human body as an implant. In the United States, five beta titanium alloys have been recommended for medical use, These include TMZFTM (Ti-12Mo-Zr-2Fe), Ti-13Nb-13Zr, Timetal 21SRx (Ti-15Mo-2.5Nb-0.2Si), Tiadyne 1610 (Ti-16Nb-9.5Hf), and Ti-15Mo. It is estimated that in the near future, this kind of titanium alloy with high strength, low elastic modulus, excellent formability and corrosion resistance is likely to replace the Ti-6Al-4V ELI alloy widely used in the medical field.