Abstract
The study of martensitic transformations in shape memory alloys by means of techniques such as unconventional scanning calorimetry, acoustic emission and optical microscopy has made it possible to establish the existing links between the hysteresis cycle and the internal state of a given material We have studied the changes in the hysteresis cycle, concerning its shape, width and relevant temperatures, which are produced as a consequence of different thermal treatments and repetitive thermal cycling, for a Cu-Zn-Al single crystal. The effect of thermomechanical treatments in Cu-Zn-Al samples with different surface orientation is also studied. Relevant changes in a mixed hysteresis cycle (Cu-Al-Ni polycrystal with two martensite phases) are observed in annealing treatments. On the other hand, observation of the interfaces movement in reduced thermal cycling establishes the temperature scale and the geometrical conditions to obtain a repetitive/recoverable hysteresis cycle
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