THE ROLE OF SELFACCOMMODATION COMPLEXES IN THE CRYSTALLOGRAPHIC REVERSIBILITY OF NONTHERMOELASTIC MARTENSITE TRANSFORMATIONS AND CONJUGATION OF ANISOTROPIC STRUCTURES

The possible structure of self-accommodation complexes of martensite crystals in alloys based on g-Mn and titanium nickelide has been analyzed. The analysis is based on the calculation of shape deformation, averaged over an ensemble of domains (equivalent versions of orientation relationships); for complete self-accommodation this deformation should be described by a unit matrix. In this case the compensation of the shape variation and minimization of elastic energy occur on the microscopic level of individual complexes of twinned martensite crystals. It is shown that complete self-accommodation of rhombohedral martensite R, as well as tetragonal and orthorhombic martensites in alloys based on y-Mn is implemented only in the complexes containing either all crystallographically equivalent versions of orientation relationships or their doubled number