Atomic models of twinning and formation of <110>-reorientation bands in bcc-crystals via bcc→fcc→bcctransformations accompanied by a change in the reverse transformation system are proposed. It is shown that {112} deformation twins are formed in the course of these transformations, when the shears and directions of homogeneous deformation of the reverse transformation occur in the crystallographically equivalent directions, making 60° angles with the initial direction (during the forward transformation) and the Kurdyumov–Sachs relations are valid. A fulfillment of the Nishiyama–Wassermann orientation relationships or a change in the type such dependence in the course of the reverse transformations gives rise to reorientation of the crystal lattice of these microbands around the <110>-type directions by the angles 60° or (60 ± 5.23)°. An important feature of these models is a considerable contribution of homogeneous transformation deformation of the martensitic type into the value of plastic deformation of the twin.
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08 November 2019
At the end of the article the acknowledgement should be added: “This work was financially supported by a grant from the Russian Science Foundation (project No. 17-19-01374)”.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 142–148, May, 2019.
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Litovchenko, I.Y., Tyumentsev, A.N. Atomic Models of Mechanical Twinning and <110>-Reorientations in BCC-Crystals. Russ Phys J 62, 886–892 (2019). https://doi.org/10.1007/s11182-019-01792-y
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DOI: https://doi.org/10.1007/s11182-019-01792-y