Abstract
Although the binary Ti-7.5Mo alloy had low elastic modulus which is an advantageous for orthopedic applications from the viewpoint of stress-shielding effect, but α”-phase titanium alloy has a relatively low strength. The present study was an attempt to increase the strength level, decrease the elastic modulus and enhanced the fatigue life of the Ti-7.5Mo alloy by thermo-mechanical treatment. Furthermore, the study compares structure and tensile/fatigue properties of the Ti-7.5Mo samples under different thermo-mechanical treatment. The Ti-7.5Mo alloy plate used in this study which was prepared by VAR process. The as-received Ti-7.5Mo alloy samples were one-step hot-rolled, solution treated, multi-step cold-rolled, and aged. The highest strength-modulus ratio of Ti-7.5Mo alloy in this study was 13.67 which was much higher than control group, Ti-6Al-4V ELI alloy. And the best 7% strain-controlled of fatigue cycles in this study was 36 times than Ti-6Al-4V ELI alloy. Based on the strength-to-modulus ratio and fatigue properties of Ti-7.5Mo alloy which prepared with the above processes and compare with Ti-6Al-4V ELI alloy, the Ti-7.5Mo alloy prepared with 65% HR reduction followed by 30 min of solution treatment, 35% of cold rolling, and a final 12 hours aging is a potential implant material
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