Relaxation Rotation during Martensitic Transformation in Alloys with Thermoelastic and Nonthermoelastic Martensite

It is shown that application of the crystallographic theory of martensitic transformation instead of
the phenomenological one allows proper understanding of the mechanism of martensitic transformation in
crystallographic analysis and computing, in addition to the previous characteristics, a new important characteristic,
that is, the relaxation rotation of martensite crystallites to obtain the invariant plane. It is demonstrated
that the angle of relaxation rotation is most strongly dependent on the crystallographic systems of the original and final phases, as well as on the lattice parameters of these phases. It has been discovered that scattering
of the texture peaks of martensite, determined as the integral half-width of the texture maximum, is in linear proportion to the angle of relaxation rotation of martensite crystals.