C-P MEASUREMENTS AROUND THE MARTENSITIC-TRANSFORMATION TEMPERATURE OFA CUALNI ALLOY

C-p measurements on a CuAlNi single crystal around its martensitic tra nsformation temperature are made by differential calorimetry (DSC). Th e results show that the transformation is not finished at the general values of M(f) (the finishing temperature of the parent phase --> pare nt phase transformation during heating). The specific heat difference between the martensite and parent phase (Delta C-p) is not equal to ze ro in the transformation temperature range. The critical stress induci ng the martensite transformation is approximately a linear function of temperature. However, the Delta S value obtained by the use of a Clau sius-Clapeyron-like relationship is a little larger than that measured by DSC.