Improvement in Fatigue Strength of Ti-29Nb-13Ta-4.6Zr with Low Young's Modulus

摘要

In order to achieve the improvement in fatigue strength of Ti-29Nb-13Ta-4.6Zr (TNTZ) with low Young's modulus, a thermomechanical treatment was optimized in this study[1]. The ω phase, which is likely to increase mechanical strength significantly but decrease ductility drastically in comparison with the a phase, was employed for precipitation strengthening. Further, a short time aging treatment was examined because a small amount of precipitated phase can suppress the increase in Young's modulus. As a result, the fatigue strength of TNTZ could be improved through a short time aging treatment using ω phase precipitation while keeping relatively low Young's modulus.