Investigation on mechanical behavior of multilayer graphene reinforced aluminum composites

Wang, Xue; Xiao, Wei; Wang, Ligen; Shi, Jing-Min; Sun, Lu; Cui, Jiandong; Wang, Jianwei

doi:10.1016/j.physe.2020.114172

Cited by 21 publications

(4 citation statements)

References 22 publications

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“…It means that embedded graphene just plays a functional role in transferring tensile load [ 29 ], especially in the model with normal tension where graphene is prone to in-plane bending. Therefore, it is safe to say that graphene may give rise to a distinct improvement in mechanical performance, but it is impossible for the composite to approach the level of graphene itself, unlike other simulations on metal–graphene composites where graphene directly bears a large deformation [ 16 , 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Atomistic Study on the Sintering Process and the Strengthening Mechanism of Al-Graphene System

Zhu

et al. 2022

Materials

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The powder metallurgy process of the Al–graphene system is conducted by molecular dynamics (MD) simulations to investigate the role of graphene. During the sintering process, graphene is considered to reduce the pore size and metal grain size based on the volume change and atomic configuration of the Al parts in the composite. Compared with the pure Al system, the space occupied by the same number of Al atoms in the sintered composite is 15–20 nm3 smaller, and the sintered composite has about 5000 fewer arranged atoms. Because these models are carefully designed to avoid a serious deformation of graphene in the tension of sandwich-like composite models, the strengthening mechanism close to the experimental theory where graphene just serves to transfer a load can be studied dynamically. The boundary comprising of two phases is confirmed to hinder the motion of dislocations, while the crack grows along the interface beside graphene, forming a fracture surface of orderly arranged Al atoms. The results indicate that single-layer graphene (SLG) gives rise to an increase of 1.2 or 0.4 GPa in tensile strength when stretched in in-plane or normal direction, while bilayer graphene (BLG) brings a clear rise of 1.2–1.3 GPa in both directions. In both in-plane and normal stretching directions, the mechanical properties of the composite can be improved clearly by graphene giving rise to a strong boundary, new crack path, and more dense structure.

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Section: Resultsmentioning

confidence: 99%

Atomistic Study on the Sintering Process and the Strengthening Mechanism of Al-Graphene System

Zhu

et al. 2022

Materials

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“…Graphene, as a model of two-dimensional carbon material with excellent mechanical, physical, and chemical properties, is potentially used in new-generation composites. By combining unique electricity [1][2][3], heat [4], mechanics [5][6][7][8], and other properties [9][10][11], graphene reinforced metal matrix composites such as copper [12][13][14], aluminum [15][16][17], nickel [18,19], and iron [20,21] are prosperous in the applications of future aerospace, military, transportation, and energy industries. For instance, compared with unreinforced aluminum matrix, the tensile strength and elongation of nano-graphene reinforced aluminum matrix composites increased from 233 MPa to 287 MPa and 5.5% to 5.8%, respectively [17].…”

Section: Introductionmentioning

confidence: 99%

Interfacial Characteristics of Graphene-Reinforced Iron Composites: A Molecular Dynamics Study

et al. 2022

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Interface has a significant effect on mechanical properties of graphene reinforced metal composites. Taking graphene nanosheet reinforced iron composite (Gr/Fe) as an example, the interfacial characteristics of Gr/Fe (110), (111), (112¯), and (001) interfaces have been studied using molecular dynamics (MD) simulations. Two types of interfacial bonding have been examined: physical and chemical bonding. The results show that when the graphene and iron form a physical adsorption (weak−bonded) interface, the interactive energy of the graphene and Fe (110), (111), (112¯), and (001) interface is −1.00 J/m2, −0.73 J/m2, −0.82 J/m2, and −0.81 J/m2, respectively. The lengths of the Fe−C bonding are distributed in the range of 2.20–3.00 Å without carbide formation, and no distinct patterns of atomic structure are identified. When the graphene and iron form a chemical (strong−bonded) interface, the corresponding interactive energy is −5.63 J/m2, −4.32 J/m2, −4.39 J/m2, and −4.52 J/m2, respectively. The lengths of the Fe−C bonding are mainly distributed in the ranges of 1.80−2.00 Å and 2.30−2.50 Å, which the carbides such as Fe3C and Fe7C3 are formed at the interface. Moiré patterns are observed at different−oriented interfaces, because of the lattice geometrical mismatch between graphene and different−oriented iron crystal structures. The pattern of diamond stripe is at the (110) interface, which is in good accordance with the experiment. Other patterns are the hexagonal pattern at the (111) interface, the wavy stripe pattern at the (112¯) interface, and the chain pattern at the (001) interface. These moiré patterns are formed through the competition and coordination of the three binding sites (Hollow, Bridge, and Top) of graphene with Fe atoms.

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“…1,23 Current thinking suggests that a key route to effectively enhancing the properties of GO-based polymer composites is achieving the uniform dispersion of GO and strong interfacial interactions between GO and the polymeric matrix. 24 Compared with other nanollers like carbon nanotubes, 25,26 graphite nanoplates, [27][28][29] montmorillonite, 30 and graphene, [31][32][33] there are abundant oxygen-containing groups (e.g., carboxyl, hydroxyl, and epoxide groups) on the surface of GO, 34 which possess the potential to undergo chemical reactions with the matrix. Currently, covalent crosslinking between these active groups and the polymer matrix, with specic modiers as connectors, has been proved to be an effective strategy for addressing the above-mentioned issues.…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched polyamide modified graphene oxide-reinforced polyurethane nanocomposites with enhanced mechanical properties

et al. 2021

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Investigation on mechanical behavior of multilayer graphene reinforced aluminum composites

Cited by 21 publications

References 22 publications

Atomistic Study on the Sintering Process and the Strengthening Mechanism of Al-Graphene System

Atomistic Study on the Sintering Process and the Strengthening Mechanism of Al-Graphene System

Interfacial Characteristics of Graphene-Reinforced Iron Composites: A Molecular Dynamics Study

Hyperbranched polyamide modified graphene oxide-reinforced polyurethane nanocomposites with enhanced mechanical properties

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