Fabrication of nickel-graphene composites with superior hardness

Kurapova, Olga Yu.; Lomakin, Ivan; Sergeev, S. N.; Solovyeva, E. N.; Zhilyaev, Alexander P.; Archakov, I. Yu.; Конаков, В. Г.

doi:10.1016/j.jallcom.2020.155463

Cited by 29 publications

(21 citation statements)

References 27 publications

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“…This implies that microcracks formed during tensile testing of this composite can decrease its ductility. The above result is in contrast to the observations [40] of fracture surfaces of bimodal Ni/graphene composites, which show the presence of voids. The reason can lie in the initial porosity of bimodal Ni/ graphene composites fabricated in [40], in contrast to nearly fully dense Cu-4Al specimens produced in [41].…”

contrasting

confidence: 99%

“…The above result is in contrast to the observations [40] of fracture surfaces of bimodal Ni/graphene composites, which show the presence of voids. The reason can lie in the initial porosity of bimodal Ni/ graphene composites fabricated in [40], in contrast to nearly fully dense Cu-4Al specimens produced in [41]. The formation of cracks in bimodal Al-4Cu/Gr composites can be related to the formation of the bimodal grain structure, which is absent in graphene-free Cu-4Al alloy.…”

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confidence: 99%

“…In particular, Kurapova et al [40] and Khoshghadam-Pireyousefan et al [41] produced metal/graphene composites with the Ni [40] and Al-4Cu [41] matrices characterized by bimodal grain size distributions. The Al-4Cu/graphene composites have shown an improvement of 79%, 49% and 44% of yield strength, ultimate strength, and Vickers hardness, respectively, for the nanocomposite containing 1 wt.% of graphene in comparison to the unreinforced Al-4Cu alloy (Fig.…”

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Plastic Deformation of Metal/Graphene Composites with Bimodal Grain Size Distribution: a Brief Review

Sheĭnerman¹

2020

Rev Adv Mater Tech

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We briefly review the experimental data and analytical models that describe plastic deformation and fracture processes in metal/graphene composites with a bimodal grain size distribution of the metallic matrix.We demonstrate that such composites can have high strength combined with good ductility. The effects of dislocation plasticity, grain boundary sliding and fracture processes on the mechanical properties of such composites are discussed.

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Plastic Deformation of Metal/Graphene Composites with Bimodal Grain Size Distribution: a Brief Review

Sheĭnerman¹

2020

Rev Adv Mater Tech

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“…Bimodal metal-graphene composites (materials consisting of large (micrometer-size) grains embedded into a nanocrystalline/ultrafine-grained (NC/UFG) metal-matrix) demonstrate that combination of bimodal grain size distribution with graphene fillers can provide simultaneously high strength and good ductility of the composite [1][2][3][4][5][6]. In such materials, the plastically nanocrystalline NC/UFG metal-matrix are responsible for ultrahigh strength, while plastically coarse grains provide good ductility.…”

Section: Introductionmentioning

confidence: 99%

“…In such materials, the plastically nanocrystalline NC/UFG metal-matrix are responsible for ultrahigh strength, while plastically coarse grains provide good ductility. Fracture processes in bimodal metalgraphene composites (having high strength and good ductility) are the subject of intensive experimental research [5,6], computer simulations [7,8] and theoretical examinations [9]. Metal-graphene composites exhibit either ductile or brittle fracture behavior, depending on their structural characteristics and the conditions of mechanical loading.…”

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confidence: 99%

Competition Between Generation of Nanovoids and Nanocracksin Bimodal Metal-Graphene Composites

Скиба¹

2021

Rev Adv Mater Tech

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A theoretical model which describes micromechanisms of the deformation-induced formation of nanovoids and the competition between the nanovoid formation and the deformation-induced formation of nanocracks in bimodal metal-graphene composites is presented. In the framework of the model, the formation of nanovoids and nanocracks occurs at the grain boundary (GB) disclination dipoles near the graphene inclusions. It is demonstrated that the formation of nanovoids at the GB disclination dipoles is energetically favorable process in deformed bimodal Ni-graphene composite.

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Breaking the Intrinsic Strength‐Ductility Tradeoff in Graphene‐Metal Composites

Choi,

Das,

Kim

et al. 2024

Small Methods

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Small carbon materials, such as graphene, offer excellent mechanical strength. Micro/nano carbon materials are often dispersed into a metal matrix to form bulk composites with mechanical enhancement. Despite technical progress, such composites intrinsically suffer from a trade‐off condition between strength and ductility because the load transfer path forms between mechanically strong yet chemically inert micro/nano carbon materials or between the carbon‐metal interfaces. In other words, conventional carbon and metal composites become stronger with increasing carbon contents, but the weak interfaces also increase, leading to premature failure. In this regard, crucial advances are presented toward breaking the strength‐ductility trade‐off condition by utilizing Axially bi‐Continuous Graphene‐Nickel (ACGN) wires. This innovative ACGN achieves excellent combined strength and ductility–the highest among the current Ni‐, Al‐, and Cu‐based carbon‐enhanced metal matrix composites. For example, the ultimate strength and failure strain of 25‐µm‐diameter ACGN wires are improved by 71.76% and 58.24%, compared to their counterparts. The experimental and theoretical analyses indicate that the graphene‐nickel interplay via their axially bi‐continuous structure is the main underlying mechanism for the superb mechanical behavior. In specific, the continuous graphene, in addition to effective load‐sharing, passivates the free surface of fine wire, forming dislocation pileups along the graphene‐nickel interface and, therefore, hindering localized necking.

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Fabrication of nickel-graphene composites with superior hardness

Cited by 29 publications

References 27 publications

Plastic Deformation of Metal/Graphene Composites with Bimodal Grain Size Distribution: a Brief Review

Plastic Deformation of Metal/Graphene Composites with Bimodal Grain Size Distribution: a Brief Review

Competition Between Generation of Nanovoids and Nanocracksin Bimodal Metal-Graphene Composites

Breaking the Intrinsic Strength‐Ductility Tradeoff in Graphene‐Metal Composites

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