On plastic strain recovery in freestanding nanocrystalline metal thin films

Jagannathan Rajagopalan, Jong H. Han, M. Taher A. Saif

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

In a recent article [J. Rajagopalan, J.H. Han, M.T.A. Saif, Science 315 (2007) 1831-1834], we have reported substantial (50-100%) plastic strain recovery in freestanding nanocrystalline metal films (grain size 50-65 nm) after unloading. The strain recovery was time dependent and thermally activated. Here we model the time evolution of this strain recovery in terms of a thermally activated dislocation propagation mechanism. The model predicts an activation volume of ≈42b3 for the strain recovery process in aluminum.

Original languageEnglish (US)
Pages (from-to)921-926
Number of pages6
JournalScripta Materialia
Volume59
Issue number9
DOIs
StatePublished - Nov 1 2008
Externally publishedYes

Keywords

  • Nanocrystalline microstructure
  • Plastic deformation
  • Strain recovery
  • Thermally activated processes
  • Thin films

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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