Abstract
The reverse transformation sequences in an as-quenched Cu11.88Al5.06Ni1.65Mn0.96Ti (wt%) shape memory alloy during heating or isochronical annealing up to 650°C have been studied by means of differential scanning calorimetry, high temperature X-ray diffraction as well as transmission electron microscopy and optical observations. The results show that at least seven stages of structural evolution, depending upon heating rate, can be distinguished: the reverse martensitic transformation and the martensite stabilization; atomic reordering in parent phase; two phase separation in D0 3 and the reversion; atomic disordering in matrix; bainitic transformation; D0 3 = B2 transition; and the precipitation of equilibrium phases. The different dependence of the evolution stages on heating rate is analyzed and discussed.
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