Plastic deformation recovery in freestanding nanocrystalline aluminum and gold thin films

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

Research output: Contribution to journalArticle

136 Scopus citations

Abstract

In nanocrystalline metals, lack of intragranular dislocation sources leads to plastic deformation mechanisms that substantially differ from those in coarse-grained metals. However, irrespective of grain size, plastic deformation is considered irrecoverable. We show experimentally that plastically deformed nanocrystalline aluminum and gold films with grain sizes of 65 nanometers and 50 nanometers, respectively, recovered a substantial fraction (50 to 100%) of plastic strain after unloading. This recovery was time dependent and was expedited at higher temperatures. Furthermore, the stress-strain characteristics during the next loading remained almost unchanged when strain recovery was complete. These observations in two dissimilar face-centered cubic metals suggest that strain recovery might be characteristic of other metals with similar grain sizes and crystalline packing.

Original languageEnglish (US)
Pages (from-to)1831-1834
Number of pages4
JournalScience
Volume315
Issue number5820
DOIs
StatePublished - Mar 30 2007
Externally publishedYes

ASJC Scopus subject areas

  • General

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