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Open accessJournal ArticleDOI: 10.1088/1757-899X/149/1/012086

Synthesis and characterization of AA 6061- Graphene - SiC hybrid nanocomposites processed through microwave sintering

01 Sep 2016-Vol. 149, Iss: 1, pp 012086
Abstract: As one of the most essential industrial and engineering materials, Aluminum alloy 6061 have been extensively used in automobile industries and many engineering applications due to its impending properties like low density, good structural rigidity, feasibility to incorporate and enhance the strength by addition of various reinforcing materials. The essential criteria in enhancing the properties without sacrificing the ductility is always challenging in Aluminum and its alloys based composites. In the recent years, enormous research has been carried on ceramic based and carbon based reinforcement materials used in Aluminum metal matrix composites. But the combination of both is never tried so far due to lack of processing methods. The current research work is carried out to process, synthesize and perform the characterization of Al 6061 matrix nanocomposites with Graphene of flake size 10 μm and SiC of particle size 10 pm as reinforcement combinations in various proportions (weight percentage) which are carried out through powder metallurgy (PM) approach. The powders are processed through ultrasonic liquid processing method and the mixtures were ball milled by adding SiC particles followed by uniaxial hot compaction. Thus prepared compacts are sintered (conventional and microwave) and mechanical properties like hardness, density are investigated as a function of Graphene and SiC concentrations (weight fraction). Relevant strengthening mechanism involved in the Al6061 - Graphene -SiC composites in comparison with monolithic Al 6061 alloy were discussed.

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Topics: Powder metallurgy (54%), Ceramic (53%), Nanocomposite (52%) ...read more
Citations
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Journal ArticleDOI: 10.1080/10426914.2020.1718698
S. A. A. Alem1, R. Latifi2, Shayan Angizi3, F. Hassanaghaei1  +3 moreInstitutions (4)
Abstract: By developing the applications of metal matrix composites (MMCs), employing more efficient fabrication methods seems necessary. Within the two last decades, microwave (MW) sintering was int...

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Topics: Powder metallurgy (55%), Metal matrix composite (54%), Ceramic (53%) ...read more

17 Citations


Open accessBook ChapterDOI: 10.5772/INTECHOPEN.90569
04 Mar 2020-

6 Citations


Open accessJournal ArticleDOI: 10.4149/KM_2020_5_341
01 Jan 2020-Metallic Materials
Abstract: Owing to its outstanding mechanical and thermal properties, graphene has shown enormous potentials as an improvement material for composites. This paper investigates the properties of graphene-reinforced 6061 aluminium alloy Metal Matrix Composites (MMCs) with varying weight percentages (5 and 10 wt.% graphene) of reinforcement. Energy Dispersive Spectroscopy (EDS) and Scanning Electron Microscope (SEM) studies of the MMC confirm the presence and distribution of graphene particles in the Al6061 matrix materials. Mechanical properties such as tensile strength, hardness, and impact strength of MMCs were studied and assessed. Tensile and impact strength of the MMC’s increased from 25 to 60 % by the addition of 10 wt.% graphene in aluminium 6061 alloys. The percentage of elongation diminished with the addition of reinforcement in the matrix. The most significant improvement in hardness can be found in additional graphene particles. Wear-test had been performed using the pin-on-disc machine at 10 N load. It was observed that the tribological behaviour of the composite improved after the addition of graphene in Al6061. K e y w o r d s: aluminium alloy 6061, graphene, tensile strength, impact strength, voids, debris

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Topics: Metal matrix composite (66%), Aluminium alloy (62%), Graphene (53%)

2 Citations


Journal ArticleDOI: 10.1016/J.MATPR.2020.10.418
Abstract: The nanoindentation behavior of aluminum alloy 6061 (Al6061) reinforced with varying weight fractions of (coated /uncoated) Multi walled Carbon Nanotubes (MWCNTs)/Graphene were studied. The nanocomposites were prepared by using powder metallurgy technique reinforced with fixed 2 wt% of (coated/uncoated) MWCNTs and 0.5 wt% & 1 wt% of varying graphene with Al6061 alloy. It was observed that, nanohardness and young's modulus increased with the addition of 2 wt% copper coated MWCNTs and 1 wt% graphene when compared with other composites. The load v/s displacement curve showed least displacement for the coated MWCNTs/graphene composites.

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Topics: Carbon nanotube (56%), Graphene (55%), Nanoindentation (50%)

1 Citations


Open accessJournal ArticleDOI: 10.3390/JCS5060155
10 Jun 2021-
Abstract: MMC based on aluminium (Al) were produced for light-weight applications especially in aviation and automobile areas. Present paper deals with the fabrication and mechanical performance of AA6061 matrix composites fortified with Al2O3 (alumina) and graphene particulates. Fluid metallurgy method namely stir casting route was employed for fabricating the hybrid composites. Al2O3p and graphene powder are mixed in different weight fractions in which graphene (1 wt. %) particle reinforcement is held consistent and Al2O3 reinforcement is differed freely with 5, 10 and 15 wt. %. Using optical analyser and SEM equipment, microstructural examination is carried out and the result reveals that the graphene and Al2O3 particles prevalently are homogeneously appropriated on the grain limits of Al matrix and Al2O3 particles are disseminated between graphene in the as-cast AA6061 MMC’s. Detailed analysis on investigation of the microstructure and mechanical aspects of Al6061-graphene-Al2O3p composites is presented by following ASTM guidelines; results uncovered that with increment in reinforcement particles, there is an enhancement in the hardness, ultimate strength, yield strength and a decline in the elongation values was however noticed when contrasted with Al6061 alloy. Fractography investigation revealed dimples in unreinforced alloy and the composite.

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Topics: Graphene (53%), Ultimate tensile strength (52%), Microstructure (50%) ...read more

1 Citations


References
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Open accessJournal ArticleDOI: 10.1007/BF02717141
M.K. Surappa1Institutions (1)
Abstract: Aluminium matrix composites (AMCs) refer to the class of light weight high performance aluminium centric material systems. The reinforcement in AMCs could be in the form of continuous/discontinuous fibres, whisker or particulates, in volume fractions ranging from a few percent to 70%. Properties of AMCs can be tailored to the demands of different industrial applications by suitable combinations of matrix, reinforcement and processing route. Presently several grades of AMCs are manufactured by different routes. Three decades of intensive research have provided a wealth of new scientific knowledge on the intrinsic and extrinsic effects of ceramic reinforcement vis-a-vis physical, mechanical, thermo-mechanical and tribological properties of AMCs. In the last few years, AMCs have been utilised in high-tech structural and functional applications including aerospace, defence, automotive, and thermal management areas, as well as in sports and recreation. It is interesting to note that research on particle-reinforced cast AMCs took root in India during the 70’s, attained industrial maturity in the developed world nd is currently in the process of joining the mainstream of materials. This paper presents an overview of AMC material ystems on aspects relating to processing, icrostructure, roperties and applications.

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860 Citations


Open accessJournal ArticleDOI: 10.1016/J.SCRIPTAMAT.2012.01.012
J.N. Wang1, Zhiqiang Li1, Genlian Fan1, Huanhuan Pan1  +2 moreInstitutions (2)
01 Apr 2012-Scripta Materialia
Abstract: Graphene has a high fracture strength of 125 GPa, making it an ideal reinforcement for composite materials. Aluminum composites reinforced with graphene nanosheets (GNSs) were fabricated for the first time through a feasible methodology based on flake powder metallurgy. The tensile strength of 249 MPa was achieved in the Al composite reinforced with only 0.3 wt.% GNSs, which is 62% enhancement over the unreinforced Al matrix. The relevant strengthening mechanisms involved in the GNS/Al composites were discussed along with experimental procedure.

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  • Figure 2. (a) SEM image of an Al flake surface with adsorbed GO nanosheets; (b) SEM image of an Al flake surface without GO nanosheets; (c) the EDS of the selected area in (a); (d) Raman spectra of GO powder and 0.3 wt.% GO/Al powders.
    Figure 2. (a) SEM image of an Al flake surface with adsorbed GO nanosheets; (b) SEM image of an Al flake surface without GO nanosheets; (c) the EDS of the selected area in (a); (d) Raman spectra of GO powder and 0.3 wt.% GO/Al powders.
  • Figure 1. (a) SEM image of flaky Al powder; the inset shows the average thickness of the Al flakes; (b) TEM image of the GO nanosheets; (c) AFM image of the GO nanosheets; (d) depth profile of the line on the GO nanosheets in (c).
    Figure 1. (a) SEM image of flaky Al powder; the inset shows the average thickness of the Al flakes; (b) TEM image of the GO nanosheets; (c) AFM image of the GO nanosheets; (d) depth profile of the line on the GO nanosheets in (c).
Topics: Ultimate tensile strength (52%), Graphene (51%), Composite number (51%)

622 Citations


Open accessJournal Article
Abstract: Article de synthese sur les avantages de l'utilisation d'hyperfrequences pour les traitements thermiques des ceramiques

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621 Citations


Journal ArticleDOI: 10.1016/J.MSEA.2011.07.043
Abstract: Composites of graphene platelets and powdered aluminum were made using ball milling, hot isostatic pressing and extrusion. The mechanical properties and microstructure were studied using hardness and tensile tests, as well as electron microscopy, X-ray diffraction and differential scanning calorimetry. Compared to the pure aluminum and multi-walled carbon nanotube composites, the graphene–aluminum composite showed decreased strength and hardness. This is explained in the context of enhanced aluminum carbide formation with the graphene filler.

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Topics: Hot isostatic pressing (58%), Graphene (56%), Mechanical properties of carbon nanotubes (55%) ...read more

412 Citations


Journal ArticleDOI: 10.1016/J.COMPOSITESB.2013.12.043
Mina Bastwros1, Gap-Yong Kim1, Can Zhu1, Kun Zhang2  +3 moreInstitutions (2)
Abstract: A 1.0 wt.% graphene reinforced aluminum 6061 (Al6061) composite was synthesized to investigate the effects of graphene dispersion by ball milling technique. The Al6061 powder and graphene were ball milled at different milling times. The composites were then synthesized by hot compaction in the semi-solid regime of the Al6061. A three point bending test was performed to characterize the mechanical properties of the composite. The ball milled powder and the fracture surfaces of the composites were analyzed using the scanning electron microscopy. A maximum enhancement of 47% in flexural strength was observed when compared with the reference Al6061 processed at the same condition.

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Topics: Ball mill (57%), Flexural strength (53%), Graphene (53%) ...read more

283 Citations


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20215
20203