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Journal ArticleDOI

Ultrasonication and microwave processing of aluminum alloy- Graphene - Al2O3 nanocomposite

02 Jan 2018-Materials and Manufacturing Processes (Taylor & Francis)-Vol. 33, Iss: 1, pp 13-18
TL;DR: Nanocomposites with Graphene and Al2O3 (particulates) as reinforcement combinations with various proportions (weight percentage) in aluminum alloy AA 2024 and AA 2219 matrix with 30 to 40
Abstract: Nanocomposites with Graphene and Al2O3 (particulates) as reinforcement combinations with various proportions (weight percentage) in aluminum alloy AA 2024 and AA 2219 matrix with 30 to 40 µm are pr...
Citations
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Journal ArticleDOI
01 Jun 2020-Carbon
TL;DR: The relationship between interfacial structure and mechanical properties of Graphene/Al matrix composites has not been fully understood yet as mentioned in this paper, however, the authors in this paper have shown that the interfacial bonding affects the performance of Granular Alloy Matrix Composites significantly, and they used polydimethylsiloxane (PDMS) as process control agent.

51 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a review of the literature on metal matrix composites reinforced with graphene, CNT and other carbonaceous materials, with a special focus on the mechanical, structural, and electrical properties.
Abstract: This articles reviews till-date available literature on metal matrix composites reinforced with graphene, CNT and other carbonaceous materials. The article has a special focus on the mechanical, tr...

24 citations

Journal ArticleDOI
TL;DR: In this article , a comprehensive and critical review of the state-of-the-art research activities related to the processing, properties, and applications of AGNCs is provided.

18 citations

Journal ArticleDOI
TL;DR: In this article, the effect of graphite nanoplatelets (GNPs) on tribological properties of the aluminum (Al), and Al/alumina (Al2O3) composite are studied.
Abstract: In the present work, the effect of graphite nanoplatelets (GNPs) on tribological properties of the aluminum (Al), and Al/alumina (Al2O3) composite are studied. GNPs are multilayer graphene sheets which were used as a solid lubricant material. Two sets of composites, Al/GNPs and Al/GNPs/Al2O3 with varying amounts of reinforcements, were synthesized by powder metallurgy that involves cold compaction followed by hot compaction. The hardness of the composites increased with the addition of GNPs and Al2O3. The Al/GNPs composite with 1 wt.% of GNPs (Al/1GNPs) showed a 20% increase in hardness whereas Al/GNPs/ Al2O3 composite with 1 wt.% GNPs and 2 wt.% Al2O3 (Al/1GNPs/2Al2O3) showed 27% increases in hardness compared to the pure Al. The coefficient of friction measured at 20 N was observed to be 22% and 53% lesser for Al/1GNPs and Al/1GNPs/2Al2O3, respectively, compared to corresponding alloys without graphene Al. The X-ray diffraction and scanning electron microscopy analysis revealed the presence of GNPs at the worn surface after the tribology tests. The wear rate was also reduced significantly. In comparison with pure Al, the Al/1GNPs and Al/1GNPs/2Al2O3 composites resulted in 5- and 20-times lesser wear rate, respectively. The addition of Al2O3 caused reduction in wear rate due to higher hardness and load carrying ability, whereas composites with more than 1 wt.% GNPs showed higher wear rate due to lower hardness and higher porosity. The Al/1GNPs/2Al2O3 composite exhibited the least coefficient of friction (0.2–0.25) and wear rate (1 × 10−6–4 × 10−6 mm3/N.m) compared to other GNPs and Al2O3 reinforced Al composites. The worn surfaces were further analyzed to understand the wear mechanism by Raman spectroscopy, transmission electron microscopy, and x-ray diffraction to detect the Al4C3 phase formation, chemical bonding, and defect formation in graphene.

15 citations

References
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Journal ArticleDOI
Shuan Liu1, Lin Gu1, Haichao Zhao1, Jianmin Chen1, Haibin Yu1 
TL;DR: Graphene (G) was dispersed uniformly in water and used as an inhibitor in waterborne epoxy coatings and the effect of dispersed G on anticorrosion performance was evaluated.

248 citations

Journal ArticleDOI
TL;DR: A summary of fundamental aspects of microwave processing of metal-based materials and their interaction with metallic materials can be found in this article, where the processing challenges have been surveyed; developments in terms of techniques and tooling have been analyzed.
Abstract: Microwave processing of materials has emerged as a new method for processing of a variety of materials in the recent years. Microwaves have been used effectively with significant advantages, particularly in food processing and chemical synthesis. They are also found to be efficient for processing polymers, ceramics, polymeric composites, and ceramic composites. The physics of interaction of microwaves with characteristically different materials is not yet explored well; consequently, there are challenges in microwave processing of metal-based materials. Industrial processing of bulk metal is yet to be popular in spite of the fact that the feasibility of metal powder sintering was demonstrated a few decades ago. This article provides a summary of fundamental aspects of microwave processing of metal-based materials and their interaction with metallic materials. The processing challenges have been surveyed; developments in terms of techniques and tooling have been analyzed. Possible effects of microw...

138 citations


"Ultrasonication and microwave proce..." refers background in this paper

  • ...Graphene is evoked as a potential candidate for microwave absorption [15], and when it encapsulates with Al2O3 particulates at lower concentrations (<1 wt%), the hybrid reinforcement is subjected to improved microwave absorption performance that is attributed to the change of dielectric parameters....

    [...]

Journal ArticleDOI
TL;DR: A strong and tough nacre-inspired nanocomposite was demonstrated based on graphene oxide and polyacrylic acid prepared via a vacuum-assisted filtration self-assembly process, which results in both high strength and toughness of the bioinspirednanocomposites.
Abstract: Inspired by the relationship between interface interactions and the high performance mechanical properties of nacre, a strong and tough nacre-inspired nanocomposite was demonstrated based on graphene oxide (GO) and polyacrylic acid (PAA) prepared via a vacuum-assisted filtration self-assembly process. The abundant hydrogen bonding between GO and PAA results in both high strength and toughness of the bioinspired nanocomposites, which are 2 and 3.3 times higher than that of pure reduced GO film, respectively. In addition, the effect of environmental relative humidity on the mechanical properties of bioinspired nanocomposites is also investigated, and is consistent with previous theoretical predictions. Moreover, this nacre-inspired nanocomposite also displays high electrical conductivity of 108.9 S cm(-1). These excellent physical properties allow this type of nacre-inspired nanocomposite to be used in many applications, such as flexible electrodes, aerospace applications, and artificial muscles etc. This nacre-inspired strategy also opens an avenue for constructing integrated high performance graphene-based nanocomposites in the near future.

123 citations


"Ultrasonication and microwave proce..." refers background in this paper

  • ...75 wt% Graphene) may be due to the occurrence of Graphene slippage due to overlap and cluster in aluminum alloy matrix [12]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the trade-off between the elastic modulus and damping capacity as a function of fiber composition in carbon-flax hybrid composite laminates was investigated, and the experimental data of the flexural strength deviated negatively from the theoretical prediction, exhibiting lower values than the predicted ones.
Abstract: The trade-off between the elastic modulus and damping capacity as a function of fibre composition in carbon–flax hybrid composite laminates was investigated. Hybrid composite laminates with varying carbon–flax fibre–epoxy content were prepared using a combination of compression moulding and vacuum bagging. The elastic modulus and damping loss coefficients were determined by free-vibration in longitudinal and flexural modes, and modelled using a rule of hybrid mixtures (ROHM) and laminate theory. The models were in close agreement with the experimental data for both the longitudinal and flexural modes and thus appeared to be a feasible method of predicting the stiffness–damping relationship in this system of hybrid composite laminates. The experimental data of the tensile strength was found to also follow the ROHM. However, the experimental data of the flexural strength deviated negatively from the theoretical prediction, exhibiting lower values than the predicted ones.

66 citations


"Ultrasonication and microwave proce..." refers background in this paper

  • ...(1) [11] and the values of both theoretical and sintered density (g/cm (3)) are summarized in Table 1....

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Journal ArticleDOI
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


"Ultrasonication and microwave proce..." refers background in this paper

  • ...Also, it is strong sp(2) – hybridized 2D- nanomaterial (sheet-like morphology) that is known for extreme strength [7, 8, 9, 10]....

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