A New Electrochemical Approach for the Synthesis of Copper-Graphene Nanocomposite Foils with High Hardness

Pavithra, C.; Sarada, Bulusu V.; Rajulapati, Koteswararao V.; Rao, Tata N.; Sundararajan, G.

doi:10.1038/srep04049

Cited by 221 publications

(119 citation statements)

References 48 publications

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“…Many previous studies have focused on designing and fabricating new graphene reinforced metal matrix composites, including aluminum [7][8][9], copper [10,11], magnesium [12], and nickel matrix composites [13,14]. In most cases, it was observed that the mechanical properties were significantly enhanced, even with the addition of a very small amount of graphene.…”

Section: Introductionmentioning

confidence: 94%

Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

et al. 2018

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Abstract:Graphene is an ideal reinforcement material for metal-matrix composites owing to its exceptional mechanical properties. However, as a 2D layered material, graphene shows highly anisotropic behavior, which greatly affects the mechanical properties of graphene-based composites. In this study, the interaction between an edge dislocation (b = 1/2 (111)) and a pair of graphene nanosheets (GNSs) in GNS reinforced iron matrix composite (GNS/Fe) was investigated using molecular dynamic simulations under simple shearing conditions. We studied the cases wherein the GNS pair was parallel to the (110), (112), and (111) planes, respectively. The results showed that the GNS reinforcement can effectively hinder dislocation motion, which improves the yield strength. The interaction between the edge dislocation and the GNS pair parallel to the (112) plane showed the strongest effect of blocking dislocations among the three cases, resulting in increases in the shear modulus and yield stress of 107% and 1400%, respectively. This remarkable enhancement was attributed to the Orowan "by-passing" strengthening mechanism, whereas cross-slip of dislocation segments was observed during looping around GNSs. Our results might contribute to the development of high-strength iron matrix composites.

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Section: Introductionmentioning

confidence: 94%

Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

et al. 2018

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“…The yield strength of composites was 376 MPa, which was 2.5 times higher than that of copper [4]. Graphene-Cu nanocomposites foils were synthesized by electrochemical way, which showed a high hardness up to 2.2-2.5 GPa and an elastic modulus to 137 GPa, increased by 96% and 30% from those of pure Cu, respectively [5]. Graphene-Al composites were obtained by powder metallurgy technique and exhibited greatly improved mechanical properties after adding graphene [6].…”

Section: Introductionmentioning

confidence: 99%

Thermal and Mechanical Properties of Graphene–Titanium Composites Synthesized by Microwave Sintering

Yang¹,

Huang²,

Wang³

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The x wt% graphene-Ti composites (x = 0, 0.2, 0.3 and 0.4) were obtained using the powder metallurgy method. The X-ray diffraction results demonstrated that the peak intensity of graphene increased monotonically with increasing graphene content. Furthermore, the number of grain boundary and interface between graphene and matrix increased as graphene increased, which led to a sharp rise of thermal resistances. The thermal conductivity and specific heat capacity of composites initially decreased drastically with addition of graphene, but then increased with increasing graphene content from 0.2 to 0.4 wt%. This phenomenon was connected with the graphene content and the characteristics of Ti matrix (pores, grain boundary and interface between graphene and matrix). The variation of the compressive strength of composites was attributed to the interaction effects of the average grain size of the Ti matrix (d m ) and the volume fraction (V f ) and aspect ratio (k) of graphene.

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“…The SEM and HRTEM analysis suggests that there is a close contact between the Cu matrix and the xGnP in the Cu-xGnP composites which contributes in enhancing the mechanical properties of the composites. Graphite nanoplatelets could be found in the grain boundary junctions [4] [35]- [37]. The theoretical density of the various Cu-xGnP composites was calculated using the rule of mixtures where the density of xGnP was 2.1 gm/cc and the density of Cu was 8.9 gm/cc.…”

Section: S N Alam Et Almentioning

confidence: 99%

Development of Cu-Exfoliated Graphite Nanoplatelets (xGnP) Metal Matrix Composite by Powder Metallurgy Route

Alam¹,

Kumar²,

Sharma³

2015

Graphene

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In the present investigation the possibility of using exfoliated graphite nanoplatelets (xGnP) as reinforcement in order to enhance the mechanical properties of Cu-based metal matrix composites is explored. Cu-based metal matrix composites reinforced with different amounts of xGnP were fabricated by powder metallurgy route. The microstructure, sliding wear behaviour and mechanical properties of the Cu-xGnP composites were investigated. xGnP has been synthesized from the graphite intercalation compounds (GIC) through rapid evaporation of the intercalant at an elevated temperature. The thermally exfoliated graphite was later sonicated for a period of 5 h in acetone in order to achieve further exfoliation. The xGnP synthesized was characterized using SEM, HRTEM, X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy. The Cu and xGnP powder mixtures were consolidated under a load of 565 MPa followed by sintering at 850˚C for 2 h in inert atmosphere. Cu-1, 2, 3 and 5 wt% xGnP composites were developed. Results of the wear test show that there is a significant improvement in the wear resistance of the composites up to addition of 2 wt% of xGnP. Hardness, tensile strength and strain at failure of the various Cu-xGnP composites also show improvement upto the addition of 2 wt% xGnP beyond which there is a decrease in these properties. The density of the composites decreases with the addition of higher wt% of xGnP although addition of higher wt% of xGnP leads to higher sinterability and densification of the composites, resulting in higher relative density values. The nature of fracture in the pure Cu as well as the various Cu-xGnP composites was found to be ductile. Nanoplatelets of graphite were found firmly embedded in the Cu matrix in case of Cu-xGnP composites containing low wt% of xGnP.

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A New Electrochemical Approach for the Synthesis of Copper-Graphene Nanocomposite Foils with High Hardness

Cited by 221 publications

References 48 publications

Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

Interaction of Edge Dislocations with Graphene Nanosheets in Graphene/Fe Composites

Thermal and Mechanical Properties of Graphene–Titanium Composites Synthesized by Microwave Sintering

Development of Cu-Exfoliated Graphite Nanoplatelets (xGnP) Metal Matrix Composite by Powder Metallurgy Route

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