Аннотация:The dependence of the stress of the onset of structural deformation of titanium nickelide on thedegree of reverse phase transformation occurring after complete direct martensitic transformation is experimentallyinvestigated. The experimental results are described qualitatively and quantitatively correctly interms of a model, in which the maximum intrinsic inelastic strain intensity of the martensitic part of the representativevolume of a shape memory alloy is used as an isotropic hardening parameter.