Abstract
We have tried to develop shape memory alloys which show martensitic transformation at a lower temperature and have better mechanical properties for use as biomaterials.The influence of alloy composition and heat treatment upon the phase transformation of TiPd and TiPd-Co alloys has been examined in this study.The phase transformed temperature of the TiPd-Co alloys which had a part of Pd contained in the Ti-42.5mol% Pd alloy exchanged for Co was lowered increasing Co concentration.The phase transformed temperature of the TiPd-Co alloys was lower than that of the Ti-42.5mol% Pd alloy.The hardness number of the Ti-37.5mol% Pd-5mol% Co alloy(VHN 260)was smallest in the TiPd and TiPd-Co alloys(0mol%<Co<15mol%)with heat treatment at 900℃ and showed a shape memory effect at a lower temperature(100℃〜200℃)than the TiPd alloys.These results indicate that TiPd-Co alloys will be useful biomaterials for shape memory alloys, such as orthodontic wire, clasp and implant denture.
