Internal friction and modulus changes associated with martensitic and reverse transformations in a single crystal Ni48.5Mn31.4Ga20.1 alloy

Abstract

Internal friction and the elastic modulus of Ni–Mn–Ga single crystals have been simultaneously measured as a function of the temperature during cooling and heating at 3 °C/min between 140 and 20 or 0 °C. The measurements were done in single cantilever mode. Two distinct internal friction peaks indicate martensitic and reverse transformation, respectively. The martensitic transformation temperature TM and reverse transformation temperature TA agree with that determined by differential scanning calorimetry. Softening of the modulus is observed near both the martensitic transformation and the reverse transformation.