High strain gradient plasticity associated with wedge indentation into face-centered cubic single crystals: Geometrically necessary dislocation densities

Jeffrey W. KYSAR*, Yong X. GAN, Timothy L. MORSE, Xi CHEN, Milton E. JONES

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

108 Citations (Scopus)

Abstract

Experimental studies on indentation into face-centered cubic (FCC) single crystals such as copper and aluminum were performed to reveal the spatially resolved variation in crystal lattice rotation induced due to wedge indentation. The crystal lattice curvature tensors of the indented crystals were calculated from the in-plane lattice rotation results as measured by electron backscatter diffraction (EBSD). Nye's dislocation density tensors for plane strain deformation of both crystals were determined from the lattice curvature tensors. The least L2-norm solutions to the geometrically necessary dislocation densities for the case in which three effective in-plane slip systems were activated in the single crystals associated with the indentation were determined. Results show the formation of lattice rotation discontinuities along with a very high density of geometrically necessary dislocations. © 2006 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1554-1573
Number of pages20
JournalJournal of the Mechanics and Physics of Solids
Volume55
Issue number7
Early online date16 Nov 2006
DOIs
Publication statusPublished - Jul 2007
Externally publishedYes

Bibliographical note

Support from the National Science Foundation under the Faculty Early Career Development Program (CMS-0134226) and AFOSR FA9550-06-1-0214 are gratefully acknowledged. This work has used the shared experimental facilities that are supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-0213574 and by the New York State Office of Science, Technology and Academic Research (NYSTAR). XC is supported by the National Science Foundation (CMS-0407743). We appreciate the reviewer's valuable suggestions on modifying the paper.

Keywords

  • Crystal plasticity
  • Dislocations
  • Electron microscopy
  • Indentation and hardness
  • Metallic materials

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