The degenerate structure of transformation twins and the monocrystallinity of part of the thin-plate martensite initiated by a strong magnetic field

In the dynamic theory, the formation of twin martensite crystals is the result of a coordinated propagation of relatively long-wave (l -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 l -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. © 2020, Allerton Press, Inc