水素環境下におけるTi-Ni-Cu合金の形状記憶特性

抄録

Shape memory properties of Ti-Ni-Cu alloy under a mild hydrogen absorbing condition have been studied. Decreases in mechanical properties such as tensile strength and total elongation occurred because of hydrogen absorption. Critical value of hydrogen content for the decrease in mechanical properties was higher in comparison to Ti-Ni alloy. Decreases in shape recovery stress and recovery rate due to hydrogen absorption during the cyclic shape memory test were not as great as that of Ti-Ni alloy. These results were considered to be caused by relatively small plastic deformation and dislocations introduced during the cyclic test, resulting from small absorption content of hydrogen due to the presence of some protective surface layer. In conclusion, Ti-Ni-Cu alloy is suitable for applications in hydrogen environment, in comparison to Ti-Ni alloy.