Influence of Heat Treatment on Martensitic Transformations in Copper-Based Alloys with Shape Memory Effect
In the present work the copper base alloys with shape memory effects were characterized. The alloys were subjected to three different heat treatments that promoted changes in characteristics of thermoelastic martensitic transformation (transformation temperatures, thermal hysteresis and enthalpies of transformation). The alloys have their microstructures characterized by optical and scanning electron microscopy. Microhardness tests were performed. Differential scanning calorimetry (DSC) was used to evaluate the transformation critical temperatures of alloy and the transformation enthalpies for each heat treated sample. Thermoelastic properties have changed for each heat treatment. In the micrographs of the heat-treated samples was possible to observe the microstructure of the martensitic phase characteristic. They show the presence of martensite platelets (needles) self-accommodation.
Carlos Roberto Grandini
L. C. Sekitani da Silva et al., "Influence of Heat Treatment on Martensitic Transformations in Copper-Based Alloys with Shape Memory Effect", Materials Science Forum, Vol. 869, pp. 474-478, 2016