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Structural refinement and deformation mechanisms in nanostructured metals

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
60
Issue
12
Identifiers
DOI: 10.1016/j.scriptamat.2009.02.027
Keywords
  • Deformation Mechanisms
  • Nanostructured Metal
  • Twinning
  • Structural Refinement
  • Plastic Deformation

Abstract

Abstract Deformation mechanisms in metals deformed to ultrahigh strains are analyzed based on a general pattern of grain subdivision down to structural scales ∼10 nm. The materials analyzed are medium- to high-stacking fault energy face-centered cubic and body-centered cubic metals with different loading conditions. The analysis points to dislocation glide as the dominant deformation mechanism at different length scales supplemented by a limited amount of twinning at the finest scales. With decreasing deformation temperature and increasing strain rate, the contribution of twinning increases.

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