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Pseudo Hall-Petch strength reduction in polycrystalline graphene
Nano letters, 2013-04, Vol.13 (4), p.1829
[Peer Reviewed Journal]
EISSN: 1530-6992 ;DOI: 10.1021/nl400542n ;PMID: 23528068
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Title:
Pseudo Hall-Petch strength reduction in polycrystalline graphene
Author:
Song, Zhigong
;
Artyukhov, Vasilii I
;
Yakobson, Boris I
;
Xu, Zhiping
Subjects:
Computer Simulation
;
Elastic Modulus
;
Graphite - chemistry
;
Models, Chemical
;
Molecular Dynamics Simulation
;
Nanoparticles - chemistry
;
Nanostructures
;
Particle Size
;
Surface Properties
Is Part Of:
Nano letters, 2013-04, Vol.13 (4), p.1829
Description:
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.
Publisher:
United States
Language:
English
Identifier:
EISSN: 1530-6992
DOI: 10.1021/nl400542n
PMID: 23528068
Source:
MEDLINE
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