Ti 29Nb 13Ta 4.6Zr (TNTZ) which was developed for biomedical applications, is a b type titanium alloy with a relatively low Young's modulus. However, its fabrication cost is high because the alloying elements of Nb and Ta, which are b stabilizers with high melting points, are expensive and rare metals. In this study, Ti Mn system alloys were developed as low cost titanium binary alloys for biomedical applications, and their mechanical properties (tensile strength and Young's modulus) and biocompatibility (bone contact ratio) were investigated to evaluate their possible use as next generation metallic biomaterials.Ti 12Mn has a tensile strength of approximately 950 MPa, which is similar to those of annealed Ti 6Al 4V ELI (Extra Low interstitial) and insufficiently aged TNTZ. Ti 9.2Mn has the lowest Young's modulus of approximately 90 GPa among the alloys investigated. The mean values of bone contact ratios on Ti 12Mn were obtained 12, 52 and 96 weeks after the implantation of rabbit femurs and were found to be slightly lower than the values for commercially pure Ti, although a small amount of Mn element was detected at a interfacial bone tissue with the concentration gradient at 96 weeks after implantation. However, there appeared to be no significant effects of the release of Mn to the bone tissue on bone formation.From these results, it is considered that Ti Mn system alloys are promising biomaterials with attractive mechanical properties and relatively good biocompatibility.
Ti 29Nb 13Ta 4.6Zr (TNTZ) is a very attractive material for biomedical applications because of its low Young's modulus. However, this alloy contains a certain amount of rare metals elements. In this study, Ti Fe Nb Zr system alloys were developed by substituting Fe for Ta as the low cost b stabilizer, and the mechanical properties and biocompatibility of these alloys were investigated forˆve diŠerent compositions through thermo mechanical treatments. The micro Vickers hardness of the Ti Fe Nb Zr system alloy decreases with Fe addition up to 7 mol because of the suppression of the v phase precipitate. Subsequently, it increases by further Fe addition due to solid solution strengthening. Ti 5Fe 3Nb 3Zr (Ti 5 3 3) subjected to solution treatment (ST) shows the lowest Young's modulus among the other composition. In addition, the tensile strength of Ti 5 3 3 subjected to ST is higher than those of the annealed Ti 6Al 4V ELI and TNTZ subjected to ST. The specimens of the alloy implanted in the femoral epicondyle of rabbit are surrounded by new bone tissue formed with direct contact after 24 and 48 weeks from the implantation. It is considered that Ti 5 3 3 has relatively good biocompatibility with contact osteo genesis as compared with those of Ti 6Al 4V ELI and SUS316L stainless steel.
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