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We present a calorimetric and TEM study of the thermal cycling effects on the martensitic transformation in [MATH] Cu-Zn-Al single crystals containing different distributions of [MATH]-phase precipitates. The calorimetric results show a high reproducibility of the transformation during cycling (up to 200 cycles) for dense distributions of coherent precipitates, and a shift towards higher temperatures (mainly the direct transformation) for a distribution of precipitates of bigger size. Arrays of dislocations similar to those formed in precipitate-free specimens were observed in this study, although in a small quantity. Moreover, complex dislocation networks in the matrix surrounding the precipitates were also observed. The effects of both kinds of dislocation arrays on the martensitic transformation are discussed

EFFECT OF THERMAL CYCLING ON THE MARTENSITIC TRANSFORMATION OF βCu-Zn-Al CONTAINING γ PRECIPITATES