Interfacial strengthening and self-healing effect in graphene-copper nanolayered composites under shear deformation

Liu, Xiaoyi; Wang, Fengchao; Wang, WenQiang; Wu, HengAn

doi:10.1016/j.carbon.2016.06.071

Cited by 93 publications

(46 citation statements)

References 55 publications

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“…Another point is that the interactions between copper and carbon atoms should be characterized by Lennard Jones (LJ) potential. In the previous study, Duan [29] and Liu [26,31] found that the LJ potential successfully described the characteristics of interactions between copper and carbon atoms. Table 1 shows parameters of the LJ potential for the interactions between copper and carbon atoms.…”

Section: Mechanical Models and Methods Of Graphene/copper Layered Commentioning

confidence: 98%

“…Huang et al [25] found that layered structures can effectively improve the mechanical properties and interfacial stability of graphene/copper composites. To avoid the initial dislocation or stress generation, the length of the analog box along the X and Y axes should be set to an integer multiple of the diameter of the graphene/copper composites, and the insertion position of graphene is the integer lattice constant of copper [26]. The X, Y, and Z directions are periodic conditions, the time step is 0.4 fs, and the fastest descent method is used to minimize the energy of the structure.…”

Section: Mechanical Models and Methods Of Graphene/copper Layered Commentioning

confidence: 99%

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The Effect of Ion Irradiation Induced Defects on Mechanical Properties of Graphene/Copper Layered Nanocomposites

Yao

Fan

2019

Metals

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One of the miraculous functions of graphene is to use its defects to alter the material properties of graphene composites and, thereby, expand the application of graphene in other fields. In this paper, various defects have been created in graphene by using ion irradiation. Defective graphene is sandwiched between two copper layers. A numerical model of Graphene/Copper layered composites after irradiation damage was established by the molecular dynamics method. The effects of ion irradiation and temperature coupling on defective graphene/copper composites were studied. The results show that there are a lot of empty defects in graphene after irradiation injury, which will produce more incomplete bonding. Although the bonds between carbon atoms can be weakened, defective graphene still enhances the mechanical properties of pure copper. At the same time, the location and arrangement of defects have a great influence on the mechanical stability of graphene/copper composites, and the arrangement of empty defects has different effects on deformation behavior and the stress transfer mechanism. It can be concluded that the defects formed by radiation have an effect on the physical properties of two-dimensional materials. Therefore, irradiation technology can be used to artificially control the formation of defects, and then make appropriate adjustments to their properties. This can not only optimize the radiation resistance and mechanical properties of nuclear materials, but also expand the application of graphene in electronic devices and other fields.

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Section: Mechanical Models and Methods Of Graphene/copper Layered Commentioning

confidence: 98%

Section: Mechanical Models and Methods Of Graphene/copper Layered Commentioning

confidence: 99%

The Effect of Ion Irradiation Induced Defects on Mechanical Properties of Graphene/Copper Layered Nanocomposites

Yao

Fan

2019

Metals

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“…Reactive empirical bond order potential is used to depict the interaction between carbon atoms. While the interaction between carbon and copper atoms is described by Lennard-Jones (LJ) potentials which have been proven to successfully investigate the peeling 37 , thermal conductance 38 and shear deformation 2 of nanolaminated graphene/metal composites. The LJ parameters with equilibrium separation σ (C-Cu) = 3.0825 Å, potential depth ɛ (C-Cu) = 0.02578 eV and the cutoff r c = 2.5 σ (C-Cu) are adopted 10 , 20 , 39 .…”

Section: Simulation Detailsmentioning

confidence: 99%

“…Graphene, as one of the most promising two dimensional material, has shown extraordinary intrinsic electrical, thermal and mechanical properties 1 . However, It is still quite difficult to directly apply graphene as structure materials due to its unique geometric features and the interfacial instability 2 . Using graphene as constituent phase in composites thus has been considered as a versatile method to make use of the excellent performance of graphene.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of strengthening mechanism of nanolaminated graphene/Cu composites under compression

Weng

Ning

et al. 2018

Sci Rep

115

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Molecular dynamics simulations of nanolaminated graphene/Cu (NGCu) and pure Cu under compression are conducted to investigate the underlying strengthening mechanism of graphene and the effect of lamella thickness. It is found that the stress-strain curves of NGCu undergo 3 regimes i.e. the elastic regime I, plastic strengthening regime II and plastic flow regime III. Incorporating graphene monolayer is proved to simultaneously contribute to the strength and ductility of the composites and the lamella thickness has a great effect on the mechanical properties of NGCu composites. Different strengthening mechanisms play main role in different regimes, the transition of mechanisms is found to be related to the deformation behavior. Graphene affected zone is developed and integrated with rule of mixtures and confined layer slip model to describe the elastic properties of NGCu and the strengthening effect of the incorporated graphene.

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“…In these, graphene-with its high in-plane elastic modulus and yield strength-is used as reinforcement component for ductile metals [2][3][4][5]. The increase in strength in the nanocomposite materials is usually attributed to the presence of interfaces that act as barriers to the propagation of dislocations [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

Vardanyan

Urbassek

2020

Materials

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Nanoindentation simulations are performed for a Ni(111) bi-crystal, in which the grain boundary is coated by a graphene layer. We study both a weak and a strong interface, realized by a 30 ∘ and a 60 ∘ twist boundary, respectively, and compare our results for the composite also with those of an elemental Ni bi-crystal. We find hardening of the elemental Ni when a strong, i.e., low-energy, grain boundary is introduced, and softening for a weak grain boundary. For the strong grain boundary, the interface barrier strength felt by dislocations upon passing the interface is responsible for the hardening; for the weak grain boundary, confinement of the dislocations results in the weakening. For the Ni-graphene composite, we find in all cases a weakening influence that is caused by the graphene blocking the passage of dislocations and absorbing them. In addition, interface failure occurs when the indenter reaches the graphene, again weakening the composite structure.

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Interfacial strengthening and self-healing effect in graphene-copper nanolayered composites under shear deformation

Cited by 93 publications

References 55 publications

The Effect of Ion Irradiation Induced Defects on Mechanical Properties of Graphene/Copper Layered Nanocomposites

The Effect of Ion Irradiation Induced Defects on Mechanical Properties of Graphene/Copper Layered Nanocomposites

Molecular dynamics study of strengthening mechanism of nanolaminated graphene/Cu composites under compression

Strength of Graphene-Coated Ni Bi-Crystals: A Molecular Dynamics Nano-Indentation Study

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