Abstract
Two variant selection criteria are often used in shape memory alloys(SMAs). One is the maximum resolved shear stress (RSS) criterion and the otheris the maximum transformation work criterion. In this paper these two measuresare calculated using the crystallographic theory of martensite (CTM) for theshape memory effect (SME) case and the crystallographic theory of martensite +detwinning, distortion and slip (CTM + DDS) for the superelasticity (SE)case. The results are compared with the experimental measurements of a CuAlNisingle-crystal SMA. The comparisons show that work is better as a variantselection criterion than RSS. In the SME case, type-II twin variants are morefavorable under uniaxial tension; while type-I twin variants are morefavorable under uniaxial compression. The calculation also shows that a greattension-compression asymmetry exists in CuAlNi single crystals.
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