<報文>高温用形状記憶材TiPd合金の変態温度と相境界

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Effects of heat treatment on the transformation temperature and determination of phase boundary of the TiPd phase have been studied for near equiatomic TiPd alloys. In TiPd alloys containing less than 50.0mol% Pd, the As temperature increases linearly with Pd concentration within the homogeneous single region. When TiPd phase coexists with the Ti_2Pd phase, the As temperature does not depend on Pd concentration but only on the annealing temperature. On the other hand in TiPd alloys containing more than 50.0mol% Pd, the As temperature is constant at 848±5 K because of coexistence of the TiPd phase and the Ti_2Pd_3 phase, independently of composition and annealing temperature. The TiPd phase exists at nonstoichiometric compositions at the Ti-rich side. The boundary at Pd-rich side of the TiPd phase is 50.0mol% Pd independent of temperature below 1180 K, whereas the boundary at Ti-rich side is 49.0mol% Pd at 973 K and gradually decreases its Pd content down to a value of 47.8mol% Pd at 1073 K. X-ray diffraction and density measurements suggested that the defect structure of the martensitic phase is considered to be of the substitutional-type over the nonstoichiometric composition of the TiPd phase.Ti-Pd alloyhigh temperature shape memorymartensitic transformationtransformation temperatureTiPd phase diagramphase boundarynonstoichiometricdefect structure
東北大学の論文
1988-03-25