About medical titanium alloys?

Titanium is non-toxic, light in weight, high in strength and has excellent biocompatibility. It is a very ideal medical metal material and can be used as an implant for implantation in the human body. Ti-6Al-4v ELI alloy is still widely used in the medical field. However, the latter will precipitate a very small amount of vanadium and aluminum ions, which reduces its cell adaptability and may cause harm to the human body. This problem has long attracted widespread attention in the medical community. As early as the mid-1980s, the United States began to develop aluminum-free, vanadium-free, and biocompatible titanium alloys, which were used in orthopedics. Japan and the United Kingdom 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 better than Ti-6Al-4v ELI. Compared with α+β titanium alloy, β titanium alloy has a higher level of strength, better incision performance and toughness, and is more suitable for implantation into the human body as an implant. In the United States, five beta titanium alloys have been recommended to the medical field, namely 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 type 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[28,32] .

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