Fatigue Performance of New Developed Biomedical Ti-15Mo Alloy with Surface Modified by TiO2 Nanotubes Formation

In recent years, it was demonstrated that Ti-Mo alloys are promising to be use as orthopedic implants. The presence of TiO₂ nanotubes can increase the bioactivity and improve the osseointegration of Ti and its alloys implants, although this modification could lead to a reduction in the dynamic mechanical properties. In this context, the purpose of the present study was to obtain self-organized nanotubes on the surface of biomedical Ti-15Mo alloy and verify whether the fatigue performance was significantly changed. Organized nanotubes were obtained by anodic oxidation using ethylene glycol + NH₄F solution. The axial fatigue behavior was characterized by stepwise increases of the applied load in air and in physiological media at 37°C. The results was compared with the as-polished samples in order to compare if the Ti-15Mo alloy fatigue behavior was affected by the surface modification, and it was found that the mechanical performance of the Ti-15Mo alloy was affected by the surface modification, in that specific experimental conditions used to obtain the nanotubes.