Strengthening effect of single-atomic-layer graphene in metal-graphene nanolayered composites.

Abstract:

:Graphene is a single-atomic-layer material with excellent mechanical properties and has the potential to enhance the strength of composites. Its two-dimensional geometry, high intrinsic strength and modulus can effectively constrain dislocation motion, resulting in the significant strengthening of metals. Here we demonstrate a new material design in the form of a nanolayered composite consisting of alternating layers of metal (copper or nickel) and monolayer graphene that has ultra-high strengths of 1.5 and 4.0 GPa for copper-graphene with 70-nm repeat layer spacing and nickel-graphene with 100-nm repeat layer spacing, respectively. The ultra-high strengths of these metal-graphene nanolayered structures indicate the effectiveness of graphene in blocking dislocation propagation across the metal-graphene interface. Ex situ and in situ transmission electron microscopy compression tests and molecular dynamics simulations confirm a build-up of dislocations at the graphene interface.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kim Y,Lee J,Yeom MS,Shin JW,Kim H,Cui Y,Kysar JW,Hone J,Jung Y,Jeon S,Han SM

doi

10.1038/ncomms3114

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2114

issn

2041-1723

pii

ncomms3114

journal_volume

4

pub_type

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