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Author

H.G. Prashantha Kumar

Other affiliations: Indian Institutes of Technology
Bio: H.G. Prashantha Kumar is an academic researcher from VIT University. The author has contributed to research in topics: Graphene & Powder metallurgy. The author has an hindex of 9, co-authored 21 publications receiving 325 citations. Previous affiliations of H.G. Prashantha Kumar include Indian Institutes of Technology.

Papers
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TL;DR: In this article, a wide-ranging overview on the state of the dispersion of graphene in composites, including materials already synthesized and characterization, is given, focusing on different dispersion methods, mechanism of strengthening, composites synthesized using graphene and its applications.

191 citations

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TL;DR: In this paper, the fatigue and wear behavior of Al6061-Graphene (varying weight fraction 0.2, 0.4 and 0.6) particulate composite are investigated in comparison with monolithic alloy.
Abstract: Graphene being one of the allotropes of carbon, has attracted and evoked keen interest in recent times as an ideal reinforcement for the composites due its outstanding strength. In the current research work, the fatigue and wear behavior of Al6061–Graphene (varying weight fraction 0.2, 0.4, 0.6 wt%) particulate composite are investigated in comparison with monolithic alloy. Initially dispersion of Graphene is carried out by ultra-sonication followed by ball milling on adding Al6061 alloy powder, consolidated by powder metallurgy process and subjected to sintering under inert gas atmosphere. The investigation on the effect of Graphene flakes on micro hardness, mass loss, coefficient of friction and surface roughness values are done under different loading conditions for the prepared samples and wear tracks are analyzed under a microscope. The possible reasons for crack initiation and subsequent fatigue failure under cyclic loading with stress ratio R = −1(sinusoidal waveform), cyclic frequency 5 Hz and stress amplitude 40–140 MPa at room temperature conditions and the type of wear due to increase in Graphene weight fractions were studied through tests results and SEM characterizations.

38 citations

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TL;DR: In this paper, the role of Graphene in reducing the wear and frictional coefficient of Al 2024-SiC -Graphene reinforced hybrid composites was investigated under dry wear conditions and processed through ultrasonication and ball milling.

31 citations

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TL;DR: In this article, the role of graphene in reducing the wear and frictional coefficient of Al 6061-graphene-reinforced metal-matrix composites (MMCs) was investigated.
Abstract: Graphene, no wonder has attracted a significant research interest due to its extensive physical properties at its single atomic thickness and 2D morphology. The current studies focus on the role of graphene in reducing the wear and frictional coefficient of Al 6061–graphene-reinforced metal–matrix composites (MMC’s). Reinforcement chosen is 0.3, 0.6 and 0.9 wt% of graphene to investigate the self-lubricating property under dry wear condition and processed through the ultrasonic liquid processor. The dry frictional wear test was carried out using pin-on-disc tribometer to evaluate the effect of graphene content in the composites under various normal load (5, 10, 15 N) and disc sliding speed (0.4, 0.8, 1.2 m/s) conditions. The results show that there is a significant increase in the hardness and wear resistance and a reduction in the coefficient of friction (μ) values compared to pure alloys. Arithmetic mean surface roughness values (Ra), max profile peak (Rp) and max valley depth (Rv) are found to ...

28 citations

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TL;DR: Graphene reinforced metal matrix composites (GRMMCs) as mentioned in this paper is the state-of-the-art material for composites with high crystal and strengthening quality.

27 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a comprehensive understanding of the fundamentals of the microstructural evolution during FSW/P has been developed, including the mechanisms underlying the development of grain structures and textures, phases, phase transformations and precipitation.

390 citations

Journal ArticleDOI
TL;DR: In this paper, three major technologies that are utilised for carbon capture are evaluated: pre-combustion, post combustion and oxyfuel combustion, and they compare carbon uptake technologies with techniques of carbon dioxide separation.
Abstract: Human activities have led to a massive increase in $$\hbox {CO}_{2}$$ emissions as a primary greenhouse gas that is contributing to climate change with higher than $$1\,^{\circ }\hbox {C}$$ global warming than that of the pre-industrial level. We evaluate the three major technologies that are utilised for carbon capture: pre-combustion, post-combustion and oxyfuel combustion. We review the advances in carbon capture, storage and utilisation. We compare carbon uptake technologies with techniques of carbon dioxide separation. Monoethanolamine is the most common carbon sorbent; yet it requires a high regeneration energy of 3.5 GJ per tonne of $$\hbox {CO}_{2}$$ . Alternatively, recent advances in sorbent technology reveal novel solvents such as a modulated amine blend with lower regeneration energy of 2.17 GJ per tonne of $$\hbox {CO}_{2}$$ . Graphene-type materials show $$\hbox {CO}_{2}$$ adsorption capacity of 0.07 mol/g, which is 10 times higher than that of specific types of activated carbon, zeolites and metal–organic frameworks. $$\hbox {CO}_{2}$$ geosequestration provides an efficient and long-term strategy for storing the captured $$\hbox {CO}_{2}$$ in geological formations with a global storage capacity factor at a Gt-scale within operational timescales. Regarding the utilisation route, currently, the gross global utilisation of $$\hbox {CO}_{2}$$ is lower than 200 million tonnes per year, which is roughly negligible compared with the extent of global anthropogenic $$\hbox {CO}_{2}$$ emissions, which is higher than 32,000 million tonnes per year. Herein, we review different $$\hbox {CO}_{2}$$ utilisation methods such as direct routes, i.e. beverage carbonation, food packaging and oil recovery, chemical industries and fuels. Moreover, we investigated additional $$\hbox {CO}_{2}$$ utilisation for base-load power generation, seasonal energy storage, and district cooling and cryogenic direct air $$\hbox {CO}_{2}$$ capture using geothermal energy. Through bibliometric mapping, we identified the research gap in the literature within this field which requires future investigations, for instance, designing new and stable ionic liquids, pore size and selectivity of metal–organic frameworks and enhancing the adsorption capacity of novel solvents. Moreover, areas such as techno-economic evaluation of novel solvents, process design and dynamic simulation require further effort as well as research and development before pilot- and commercial-scale trials.

270 citations

Journal ArticleDOI
TL;DR: In this paper, a review of recent advances in processing, microstructure, wear, and mechanical characterization of aluminum composites reinforced with different particles are addressed, and future scope of these composites is also briefly discussed at the end of the manuscript.

175 citations

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TL;DR: In this paper, an extensive account of the large number of processing methods that can be employed to prepare copper/graphene composites along with a description of the microstructures that may be produced.
Abstract: Recent research upon the incorporation of graphene into copper matrix composites is reviewed in detail. An extensive account is given of the large number of processing methods that can be employed to prepare copper/graphene composites along with a description of the microstructures that may be produced. Processing routes that have been employed are described including powder methods, electrochemical processing, chemical vapour deposition, layer-by-layer processing, liquid metal infiltration among a number of others. The mechanical properties of the composites are described in detail along with an account of the structural factors that control mechanical behaviour. The mechanics and mechanisms of deformation are discussed, and the effect of factors such as the graphene content and the type of graphene used, along with processing conditions for the fabrication of the composites, is described. The functional properties of copper/graphene composites are also reviewed including their electrical and thermal properties, and tribological and corrosion behaviour. In each case, the effect of the graphene type and content, and processing conditions are also described. Finally, possible future applications of copper/graphene composites are discussed.

164 citations

Journal ArticleDOI
TL;DR: In this paper, a method of creating lightweight, aluminum-metallic, composite materials under halides melt at temperatures 973 −1073 ǫ under air atmosphere is proposed.

140 citations