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Russian Physics Journal

, Volume 62, Issue 5, pp 886–892 | Cite as

Atomic Models of Mechanical Twinning and <110>-Reorientations in BCC-Crystals

  • I. Yu. LitovchenkoEmail author
  • A. N. Tyumentsev
Article
  • 8 Downloads

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.

Keywords

deformation mechanisms nanocrystals reversible transformations via alternative pathways mechanical twinning crystal lattice reorientations 

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Intstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of SciencesTomskRussia
  2. 2.National Research Tomsk State UniversityTomskRussia

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