Development of Ti-Ni alloy as a stress shielding biomaterial

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The purpose of this research was to evaluate the impact stress transmission of Ti-Ni alloy for biomedical stress shielding. An impact compression test was carried out with use of split-Hopkinson pressure-bar technique with cylindrical specimens of Ti-Ni alloy, titanium and stainless steel. As a result, the transmitted pulse through Ti-Ni alloy was considerably depressed as compared with those through titanium and stainless steel. The initial stress reduction was large through Ti-Ni alloy and titanium, but the stress reduction through Ti-Ni alloy was much more continuous than titanium. The maximum value in the stress difference betweeen incident and transmitted pulses throgh Ti-Ni alloy or titanium was higher than that through stainless steel, while the stress reduction in the maximum stress through Ti-Ni alloy was statistically larger than that through titanium or stainless steel. Ti-Ni alloy transmitted less impact stress than titanium or stainless steel, which suggested that the loading stress to adjacent tissues could be decreased with use of Ti-Ni alloy as a component material in an implant system. Transformation behavior of the alloy, which is an important factor on the stress transmission, were alos investigated by means of DSC.