Experimental determination of stress of structural transition beginning in titanium nickelide after oriented transformation

The results of experimental studies on oriented transformation followed by loading in the mode of martensitic inelasticity of titanium nickelide are presented. It is shown, in order to describe the structural mechanism of shape memory alloy (SMA) deformation, it is more correct to use the maximum intensity of the martensitic part deformation of the SMAs representative volume as an isotropic hardening parameter, rather than the averaged phase-structural deformation. The hypothesis of a linear dependence of the SMA compliance 1 / E on the volume fraction of the martensite phase q is better in agreement with the experimental data than the hypothesis of a linear dependence of Youngs modulus E on q.