Effect of aging on martensitic transformation in Ti-Rich Ti-Pd shape memory alloy

Abstract

Effect of aging on successive martensitic transformation in a Ti-47 at%Pd shape memory alloy has been studied by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). After short time aging successive transformation takes place in Ti-47 at%Pd alloy irrespective of aging temperature. On the other hand, after relatively prolonged period only the specimen aged above 1073 K shows successive transformation. The change of transformation behavior with aging condition is discussed on the basis of equilibrium between TiPd matrix and Ti2Pd precipitate. The homogeneity range of TiPd compound is also estimated from the transformation behavior and TEM observations.