Plasticity responses in ultra-small confined cubes and films

M. J. Cordill, M. D. Chambers, M. S. Lund, D. M. Hallman, C. R. Perrey, C. B. Carter, A. Bapat, U. Kortshagen, W. W. Gerberich

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Nanoindentation-induced dislocation emission at 5-7 nm displacements in ultra-thin films (12-33 nm) and nanocubes (40-60 nm) is used to examine deformation and plasticity models. Using the Tabor estimate, this displacement corresponds to a plastic strain of 3-5%. Load-displacement curves produced using nanoindentation show evidence of discretized, Burgers vector-length displacement steps, or excursions, which can be associated with individual dislocation emission events. Using these displacement steps and the residual plasticity present on unloading, theoretical hardening models are developed. Linear and parabolic hardening approaches are compared for ultra-thin films of nickel, cobalt, and Permalloy (Ni80Fe20), and also for silicon nanocubes. It is determined that the linear hardening model can predict the early trends of the experimental data while parabolic hardening may be more appropriate at later stages.

Original languageEnglish (US)
Pages (from-to)4515-4523
Number of pages9
JournalActa Materialia
Volume54
Issue number17
DOIs
StatePublished - Oct 1 2006

Keywords

  • Deformation
  • Dislocation
  • Nanoindentation
  • Plasticity
  • Thin films

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    Cordill, M. J., Chambers, M. D., Lund, M. S., Hallman, D. M., Perrey, C. R., Carter, C. B., Bapat, A., Kortshagen, U., & Gerberich, W. W. (2006). Plasticity responses in ultra-small confined cubes and films. Acta Materialia, 54(17), 4515-4523. https://doi.org/10.1016/j.actamat.2006.05.037