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

Youbin Kim, Jinsup Lee, Min Sun Yeom, Jae Won Shin, Hyungjun Kim, Yi Cui, Jeffrey W. Kysar, James Hone, Yousung Jung (), Seokwoo Jeon () and Seung Min Han ()
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Youbin Kim: Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of Science & Technology
Jinsup Lee: Korea Advanced Institute of Science & Technology
Min Sun Yeom: SMB Knowledge Support Center, KISTI
Jae Won Shin: Korea Basic Science Institute (KBSI)
Hyungjun Kim: Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of Science & Technology
Yi Cui: Stanford University
Jeffrey W. Kysar: Columbia University
James Hone: Columbia University
Yousung Jung: Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of Science & Technology
Seokwoo Jeon: Korea Advanced Institute of Science & Technology
Seung Min Han: Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of Science & Technology

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3114

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