Abstract

The equilibrium internal twin structure of a martensite plate can be changed and the habit plane deviates from an invariant plane under external stresses. Therefore, the internal stress and the elastic energy arise. It leads to the unstability of martensitic stress-induced transformations and the thermodynamic (not dependent on strain rate) hysteresis of the superelastic deformation. The hysteresis width depends strongly on the type of martensitic transformation and the orientation of external load. The theoretical conception is well supported by available experimental data.

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