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Pseudo Hall-Petch strength reduction in polycrystalline graphene.

Authors
  • Song, Zhigong
  • Artyukhov, Vasilii I
  • Yakobson, Boris I
  • Xu, Zhiping
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Apr 10, 2013
Volume
13
Issue
4
Pages
1829–1833
Identifiers
DOI: 10.1021/nl400542n
PMID: 23528068
Source
Medline
License
Unknown

Abstract

The fracture of polycrystalline graphene is explored by performing molecular dynamics simulations with realistic finite-grain-size models, emphasizing the role of grain boundary ends and junctions. The simulations reveal a ~50% or more strength reduction due to the presence of the network of boundaries between polygonal grains, with cracks preferentially starting at the junctions. With a larger grain size, a surprising systematic decrease of tensile strength and failure strain is observed, while the elastic modulus rises. The observed crack localization and strength behavior are well-explained by a dislocation-pileup model, reminiscent of the Hall-Petch effect but coming from different underlying physics.

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