Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer
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 compres...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2019-03-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/1.5086333 |
| _version_ | 1818173704162508800 |
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| author | Sun-Young Park Young-Cheon Kim Rodney S. Ruoff Ju-Young Kim |
| author_facet | Sun-Young Park Young-Cheon Kim Rodney S. Ruoff Ju-Young Kim |
| author_sort | Sun-Young Park |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T19:32:44Z |
| format | Article |
| id | doaj.art-653e7b001eeb4e79a370e0bbda536565 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-12-11T19:32:44Z |
| publishDate | 2019-03-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-653e7b001eeb4e79a370e0bbda5365652022-12-22T00:53:13ZengAIP Publishing LLCAPL Materials2166-532X2019-03-0173031106031106-510.1063/1.5086333006903APMIncipient plasticity and fully plastic contact behavior of copper coated with a graphene layerSun-Young Park0Young-Cheon Kim1Rodney S. Ruoff2Ju-Young Kim3Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, South KoreaSchool of Advanced Materials Engineering, Andong National University, Gyeongsangbuk-do 36729, South KoreaCenter for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, South KoreaCenter for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, South KoreaCu 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.http://dx.doi.org/10.1063/1.5086333 |
| spellingShingle | Sun-Young Park Young-Cheon Kim Rodney S. Ruoff Ju-Young Kim Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer APL Materials |
| title | Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| title_full | Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| title_fullStr | Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| title_full_unstemmed | Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| title_short | Incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| title_sort | incipient plasticity and fully plastic contact behavior of copper coated with a graphene layer |
| url | http://dx.doi.org/10.1063/1.5086333 |
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