抄録
This paper describes effects of Mo and Nb contents on mechanical properties of Ni-free Ti-Nb-Mo-Al alloys. The materials are Ti-8Nb-4Mo-3Al, Ti-8Nb-(5-6)Mo-5Al and Ti-(10-12)Nb-4Mo-5Al (mol%). Loading-unloading tensile tests were carried out at 173K, 296K and 413K. Young's modulus decreases with increasing Mo and Nb contents, and the Ti-8Nb-6Mo-5Al and Ti-12Nb-4Mo-5Al alloys show low Young's modulus. Also, there is scarcely an effect of temperature on Young' modulus. The elastic strain increases with increasing Mo and Nb contents. The Ti-8Nb-5Mo-Al and Ti-12Nb-4Mo-5Al alloys show the large superelastic recovery strain at 173K and 296K. However, there is scarcely the superelastic recovery strain at 413K. The large total recovery strain is seen in the Ti-8Nb-(5-6)Mo-5Al and Ti-12Nb-4Mo-5Al alloys at 173K and 296K.
