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Strengthening mechanisms of graphene coated copper under nanoindentation
Zhao, YB; Peng, XH; Fu, T; Zhu, XF; Hu, N; Yan, C; Peng, XH (reprint author), Chongqing Univ, Coll Aerosp Engn, 174 Shazheng St, Chongqing 400044, Peoples R China.; Yan, C (reprint author), Queensland Univ Technol, Sch Chem Phys & Mech Engn, Sci & Engn Fac, 2 George St,GPO Box 2434, Brisbane, Qld, Australia.
2018-03-01
Source PublicationCOMPUTATIONAL MATERIALS SCIENCE
ISSN0927-0256
Volume144Pages:42-49
AbstractWe conduct molecular dynamics simulations to investigate the strengthening mechanisms of monolayer graphene coated copper during nanoindentation. It was found that the fracture of the graphene coating includes three stages: (i) initiation of decagon defects, (ii) growth of decagon defects, and (iii) formation of pearl necklace like structure. After the graphene breaks, the intact graphene coating around the indentation still plays a role in strengthening the copper substrate. The shear modulus mismatch and the lattice mismatch at the interface result in the image and misfit stresses, which act as a barrier to impede dislocations to slip out of the copper surface, thereinto, the image stress is the dominant. In addition, it is interesting to observe pristmatic partial dislocation loop and twinning planes during the indentation. (C) 2017 Elsevier B.V. All rights reserved.; We conduct molecular dynamics simulations to investigate the strengthening mechanisms of monolayer graphene coated copper during nanoindentation. It was found that the fracture of the graphene coating includes three stages: (i) initiation of decagon defects, (ii) growth of decagon defects, and (iii) formation of pearl necklace like structure. After the graphene breaks, the intact graphene coating around the indentation still plays a role in strengthening the copper substrate. The shear modulus mismatch and the lattice mismatch at the interface result in the image and misfit stresses, which act as a barrier to impede dislocations to slip out of the copper surface, thereinto, the image stress is the dominant. In addition, it is interesting to observe pristmatic partial dislocation loop and twinning planes during the indentation. (C) 2017 Elsevier B.V. All rights reserved.
description.department[zhao, yinbo ; peng, xianghe ; fu, tao ; hu, ning] chongqing univ, coll aerosp engn, 174 shazheng st, chongqing 400044, peoples r china ; [zhao, yinbo ; zhu, xiaofei ; yan, cheng] queensland univ technol, sch chem phys & mech engn, sci & engn fac, 2 george st,gpo box 2434, brisbane, qld, australia ; [zhu, xiaofei] chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [hu, ning] chongqing univ, key lab optoelect technol & syst, educ minist china, 174 shazheng st, chongqing 400044, peoples r china
KeywordMolecular-dynamics Simulation Monolayer Graphene Deformation Twins Nanolayered Composites Atomistic Simulations Plastic-deformation Multilayers Metals Films Nanocomposites
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China [11332013, 11372104, 11632004]; ARC Discovery Project [150101717]; Key Program for International Science and Technology Cooperation Projects of Ministry of Science and Technology of China [2016YFE0125900]; program of China Scholarships Council [201606050043]; The High Performance Computing (HPC); CARF at QUT
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79466
Collection中国科学院金属研究所
Corresponding AuthorPeng, XH (reprint author), Chongqing Univ, Coll Aerosp Engn, 174 Shazheng St, Chongqing 400044, Peoples R China.; Yan, C (reprint author), Queensland Univ Technol, Sch Chem Phys & Mech Engn, Sci & Engn Fac, 2 George St,GPO Box 2434, Brisbane, Qld, Australia.
Recommended Citation
GB/T 7714
Zhao, YB,Peng, XH,Fu, T,et al. Strengthening mechanisms of graphene coated copper under nanoindentation[J]. COMPUTATIONAL MATERIALS SCIENCE,2018,144:42-49.
APA Zhao, YB.,Peng, XH.,Fu, T.,Zhu, XF.,Hu, N.,...&Yan, C .(2018).Strengthening mechanisms of graphene coated copper under nanoindentation.COMPUTATIONAL MATERIALS SCIENCE,144,42-49.
MLA Zhao, YB,et al."Strengthening mechanisms of graphene coated copper under nanoindentation".COMPUTATIONAL MATERIALS SCIENCE 144(2018):42-49.
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