Self-organization of plastic deformation and deformation relief in FCC single crystals

E. A. Alfyorova, D. V. Lychagin

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The purpose of this article is to present patterns for various types of deformation relief formed by octahedral slip, ways of its self-organization and its ability for stress relaxation. The article shows quantitatively that with the scale-up of the structural element of the deformation relief in the sequence of “shear traces, mesobands, macrobands, folds” the deformation becomes more inhomogeneous at their joints. At the same time, self-organization of deformation within the area occupied by one type of relief occurs in such a way that inhomogeneity of deformation within the occupied area decreases, and deformation in any local area tends to the average deformation on the face. The research shows that deformation relief formed on the crystal surface by octahedral slip releases stress at the meso and macro levels. It is shown that self-organization of shear traces into pack slip band, meso and macro bands reduces local stresses at the place of their formation as compared to the zone occupied by the shear traces. Estimated calculations showed that the difference in the rate of local strain between different types of structural elements of relief increased by about 40%. It is shown that the development of the quasiperiodic profile of the crystal surface upon plastic deformation occurs in terms of the Asaro-Tiller-Grinfeld instability. The critical wavelengths of surface perturbations λc are calculated for structural elements of the various relief types. Qualitative similarities of the deformation relief which forms in FCC single crystals suggests possible similarities in the results provided.

Original languageEnglish
Pages (from-to)202-213
Number of pages12
JournalMechanics of Materials
Volume117
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • Crystal plasticity
  • Deformation inhomogeneity
  • Deformation relief
  • Grinfeld instability
  • Self-organization
  • Stress relaxation

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)
  • Mechanics of Materials

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