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다차원 탄소재료 연구단
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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(s)
Sun-Young Park; Young-Cheon Kim; Rodney S. Ruoff; Ju-Young Kim
Publication Date
2019-03
Journal
APL MATERIALS, v.7, no.3, pp.031106 -
Publisher
AMER INST PHYSICS
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. (C) 2019 Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/5892
ISSN
2166-532X
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
Files in This Item:
4. 1.5086333.pdfDownload

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