Mechanical anisotropy associated with the beta 2 to zeta 2′ martensitic transformation in AuCd shape memory alloys – IOPscience

Applying stress to shape memory alloy (SMA) single crystals in the superelastic temperature regime induces reversible strain associated with transformation from austenite to martensite. The phenomenological theory of martensite crystallography predicts a reversible transformation strain for SMAs, which can be closely approximated by a set of shear vector-shear plane combinations. Since the transformation shear systems have particular orientations relative to the austenite crystal, it is expected that the stress required for transformation, and the resulting transformation strain, will be anisotropic. A correlation has recently been proposed between the shear vector-shear plane orientations and mechanical anisotropy of SMA single crystals. The present paper models the beta 2 to zeta 2' (trigonal) martensitic transformation in AuCd with the objective of testing the proposed correlation. The transformation shear systems in AuCd approximate (110)(011) beta 2 and shear systems, which the correlation suggests should result in strong mechanical anisotropy. The model results for AuCd exhibit strong anisotropy, consistent with the previously proposed correlation. Please see the page article level metrics in IOPscience for more information about the statistics available. Article usage data are updated once a week. Source.

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