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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer

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Title
Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer
Author
Park, Sun-YoungKim, Young-CheonRuoff, Rodney S.Kim, Ju-Young
Issue Date
2019-03
Publisher
American Institute of Physics Inc.
Citation
APL MATERIALS, v.7, no.3, pp.031106
Abstract
Cu coated with a graphene layer increases the elastic modulus from 163.4 GPa to 176.7 GPa, as analyzed for the initial elastic loading during nanoindentation by the Hertzian contact theory. This is attributed to stiffening, due to the ultra-high elastic modulus of the graphene layer, and the compressive in-plane residual stresses in the Cu surface volume introduced by the lattice mismatch between graphene and Cu. The graphene layer induces incipient plasticity, manifested by pop-in events during nanoindentation loading, at shallower indentation depths. This could be due to the compressive in-plane residual stress in the Cu surface volume; however, this compressive stress does not significantly change the critical resolved shear stress for the incipient plasticity. Even in the fully plastic contact region, at an indentation depth of 100 nm, the graphene layer affects the stress distribution underneath the indenter, resulting in a lower pile-up height. When considering this reduced pile-up height, the graphene layer is found to enhance elastic modulus by 5%, whereas it has no effect on hardness.
URI
https://scholarworks.unist.ac.kr/handle/201301/27047
URL
https://aip.scitation.org/doi/10.1063/1.5086333
DOI
10.1063/1.5086333
ISSN
2166-532X
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