It was recalled that the response of twinned domains under stress played a critical role in the anisotropy of the mechanical (stress-strain curve) and thermomechanical (stress-strain-temperature curve) behaviours of textured shape memory alloys. Recent results had shown that the relationship, between the shear direction of texturally distributed martensite twins and the loading direction, played a critical role in the anisotropy of both microscopic and macroscopic deformation processes. On the basis of this observation, the orientation dependence of the de-twinning process was analyzed from a crystallographic point of view by using mechanics of heterogeneous materials. The results were found to agree with experimental observations. For a NiTi sheet with a given texture, the predicted responses of 2 types of martensite twin, <011>-type II and (001) compound, as a function of loading direction agreed well with the main features of experimental observations.

Prediction of the De-Twinning Anisotropy in Textured NiTi Shape Memory Alloy. Q.S.Zheng, Y.Liu: Philosophical Magazine A, 2002, 82[4], 665-83