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Abstract
A study of the crystallography of the martensitic transformation in a Cu-26.71Zn-4.15Al shape memory alloy by means of group theory is presented. The habit plane of the martensite calculated from the phenomenological crystallographic theory of martensitic transformations proposed by W-L-R is found to be (−1, 7.55, 7.83) assuming a model of B2 (parent) to modified 9R monoclinic structure (martensite) which is quite consistent with that of experimental results (−1,7,8). From group theory we have obtained the irreducible representation and the 24 martensite variants associated with the martensitic transformation in this alloy system. A self-accommodating group is found to be D 2 k and the symmetry in one and the set of self-accommodating groups is analyzed. The results show that group theory may be an important tool for the study of martensitic transformations.
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