A high-resolution neutron scattering study of Ni62.5{Al}37.5$ shows that the martensitic transformation is associated with a homogeneous distortion and a nearly seven-fold modulation of the cubic lattice which is predicted by an observed phonon anomaly above ${T}M$. In the low-temperature 7R phase a nonuniform spacing of superlattice reflections and unusual line shapes are observed which are believed to arise from stacking faults.
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Shapiro et al. (1989) studied this question.
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