Titanium is non-toxic, light, strong and has excellent biocompatibility, is
an ideal medical metal material, can be used as implants into the human body. At
present, Ti-6 Al-4v ELI alloys are still widely used in the field of medicine.
However, the latter will precipitate very small amounts of radon and aluminum
ions, reduce their cell adaptability and may cause harm to the human body, the
problem has long attracted widespread attention in the medical community.
As early as the mid-1980s, the United States began to develop
aluminum-free, molybdenum-free, biocompatible titanium alloy, it is used in
orthopaedics.
Japan, the United Kingdom, etc. have also done a lot of research work in
this area, and made some new progress. For example, Japan has developed a range
of α with excellent biocompatible β titanium alloys, including
Ti-15Zr-4Nb_4ta-0.2Pd, Ti-15Zr-4Nb-aTa-0.2Pd 0.20 to 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 those of the Ti-6Al-4v ELI. Titanium alloys β have
higher strength, better incision properties and toughness than α-β titanium
alloys, and are better suited for implantation into the body as implants. In the
United States, five β titanium alloys have been recommended for medical use,
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, such ti-6 Al-4V ELI alloys with
high strength, low elasticity modulus and excellent forming and corrosion
resistance are likely to replace the Ti-6Al-4V ELI alloys, which are widely used
in the medical field.
