The Degenerate Structure of Transformation Twins and the Monocrystallinity of Part of the Thin-Plate Martensite Initiated by a Strong Magnetic Field

Abstract–In the dynamic theory, the formation of twin martensite crystals is the result of a coordinated propagation of relatively long-wave ( $$\ell $$ -waves) and short-wave (s-waves) displacements. The matching condition is analyzed for the γ–α martensitic transformation in iron-based alloys, taking into account the quasi-longitudinalness of the $$\ell $$ -wave carrying compression deformation. It has been shown for the first time that the previously established single-crystal effect of part of the crystals of thin-plate martensite, which arises upon cooling under the action of a strong magnetic field, can naturally be interpreted as a consequence of the formation of a degenerate structure of transformation twins.