Strengthening mechanisms of graphene sheets in aluminium matrix nanocomposites

Boostani, A. Fadavi; Yazdani, S.; Mousavian, R. Taherzadeh; Tahamtan, S.; Khosroshahi, R. Azari; Wei, Dong Bin; Brabazon, Dermot; Xu, Jianzhong; Zhang, X.M.; Jiang, Zhengyi

doi:10.1016/j.matdes.2015.09.063

Cited by 147 publications

(20 citation statements)

References 35 publications

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“…Diffusion or chemical bonding, mechanical bonding, and Van der Waals bonding are the main interfacial bonding reported in metal-matrix composites [61]. Due to the low processing temperature (200 °C) used in the current investigation, the brittle Al 4 C 3 phase did not form in the Al-GNS interface, and mechanical bonding resulting from surface wrinkles in the GNSs was the dominant interfacial bonding [62]. Therefore, better mechanical properties were expected.…”

Section: Resultsmentioning

confidence: 99%

Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing

et al. 2019

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Layered-graphene reinforced-metal matrix nanocomposites with excellent mechanical properties and low density are a new class of advanced materials for a broad range of applications. A facile three-step approach based on ultra-sonication for dispersion of graphene nanosheets (GNSs), ball milling for Al-powder mixing with different weight percentages of GNSs, and equal-channel angular pressing for powders’ consolidation at 200 °C was applied for nanocomposite fabrication. The Raman analysis revealed that the GNSs in the sample with 0.25 wt.% GNSs were exfoliated by the creation of some defects and disordering. X-ray diffraction and microstructural analysis confirmed that the interaction of the GNSs and the matrix was almost mechanical, interfacial bonding. The density test demonstrated that all samples except the 1 wt.% GNSs were fully densified due to the formation of microvoids, which were observed in the scanning electron microscope analysis. Investigation of the mechanical properties showed that by using Al powders with commercial purity, the 0.25 wt.% GNS sample possessed the maximum hardness, ultimate shear strength, and uniform normal displacement in comparison with the other samples. The highest mechanical properties were observed in the 0.25 wt.% GNSs composite, resulting from the embedding of exfoliated GNSs between Al powders, excellent mechanical bonding, and grain refinement. In contrast, agglomerated GNSs and the existence of microvoids caused deterioration of the mechanical properties in the 1 wt.% GNSs sample.

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Section: Resultsmentioning

confidence: 99%

Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing

et al. 2019

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“…Apart from these promising results, the enhancement in the strength and conductivity of these composites requires further examination and development to actualize the potential of this new material. The possibility of using SiC nanoparticles wrapped by graphene sheets as carrier agents for the incorporation of these structures into AMCs is a promising new route [35] to achieve this.…”

Section: S C =  Rmentioning

confidence: 99%

Graphene oxide and graphene nanosheet reinforced aluminium matrix composites: Powder synthesis and prepared composite characteristics

et al. 2016

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The preparation and properties of reduced graphene oxide (rGO) and graphene nanosheets (GNSs) reinforcement of aluminium matrix nanocomposites (AMCs) are reported. For the rGO-AMCs, commercial colloidal GO was coated onto aluminium powder particles and then reduced via thermal annealing. For the GNS-AMCs, graphene exfoliated from graphite through ultrasonication and centrifugation was coated onto aluminium particle surfaces via dispersion mixing, filtering and drying. Pure aluminium and aluminium composites with various reinforcement concentrations of rGO and GNS were cold compacted into disc-shaped specimens and sintered in inert atmosphere. The mechanical properties and microstructure were studied and characterised via Vickers hardness, X-ray diffraction, density measurement, and scanning electron microscopy. The reinforcements were uniformly distributed onto the aluminium particle surfaces before and after consolidation within the composites. The relevant factors for the powder metallurgy process (compaction pressure, density, and sintering conditions) were optimised. Increased levels of increased hardness were recorded, over baseline compacted and sintered pure aluminium samples, prepared under identical experimental conditions, of 32% and 43% respectively for the 0.3wt.% rGO-Al and 0.15wt.% GNSs-Al composites. The process developed and presented herein provides encouraging results for realising rGO-AMC and GNS-AMC nanocomposites via low cost cold powder compaction and sintering metallurgy techniques.

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“…Только в последние два года развиты методы, позволяющие избегать образования карбида алюминия. В настоящее время опубликованы работы по синтезу алюминий-графеновых композитов, в которых также наблюдается одновременное увеличение прочности и относительного удлинения для композитов, содержащих до 3 мас.% графена [10,21]. Как известно, графен одновременно обладает высокими прочностными и пластическими свойствами.…”

Section: идентификация диаграммы пластичностиunclassified

“…По всей видимости, и алюминийграфеновый материал может проявлять это уникальное сочетание свойств в тех случаях, когда: 1) графеновые включения в композите представляют собой графен, а не малослойный графит; 2) листы графена равномерно распределены по всему объему композита; 3) не образуется фаза карбида алюминия, которая охрупчивает композитный материал. К сожалению, в настоящее время ни одна из имеющихся теорий [10] не может объяснить этот многократно подтвержденный экспериментальный факт.…”

Section: идентификация диаграммы пластичностиunclassified

A fracture locus for a 1 wt% aluminum-graphene metal matrix composite at 300°C

Вичужанин¹,

Yolshina²,

Muradymov³

et al. 2018

LoM

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A fracture locus for a 1 wt% aluminum-graphene metal matrix composite is obtained from experiments at 300°C. The fracture locus determines a functional dependence of ultimate metal ductility on the stress state characteristics. Tensile tests of smooth cylindrical specimens, notched cylindrical specimens, bell-shaped specimens and tests on conventional and "supported" pressing of the bottoms of thick-walled cups are performed. The tests are simulated by the finite-element method to evaluate the stress-strain state in the fracture region. The fracture locus makes it possible to evaluate the ultimate ductility of the composite as a function of the stress triaxiality factor k and the Lode-Nadai coefficient μ σ . The fracture locus can be used in the range of k from −0.08 to 1.39 and in the full range of μ σ . The composite under study manifests a significant ductility. The plastic strain to fracture of the composite under axisymmetric deformation, when μ σ = −1, is at least 2.6 times higher than that of commercially pure aluminum, while under the plane stress state the excess ratio is at least 2.2. The plastic strain to fracture of the composite under axisymmetric deformation for μ σ = +1 and k = +1 is approximately the same as that of commercially pure aluminum. As the stress state becomes less severe, the ductility of the composite becomes higher than that of commercially pure aluminum. The obtained fracture locus is applicable to the evaluation of damage accumulated in the composite in a metal forming process.

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Strengthening mechanisms of graphene sheets in aluminium matrix nanocomposites

Cited by 147 publications

References 35 publications

Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing

Investigating the Microstructure and Mechanical Properties of Aluminum-Matrix Reinforced-Graphene Nanosheet Composites Fabricated by Mechanical Milling and Equal-Channel Angular Pressing

Graphene oxide and graphene nanosheet reinforced aluminium matrix composites: Powder synthesis and prepared composite characteristics

A fracture locus for a 1 wt% aluminum-graphene metal matrix composite at 300°C

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