Singly dispersed carbon nanotube/aluminum composites fabricated by powder metallurgy combined with friction stir processing

Liu, Z. Y.; Xiao, B.L.; Wang, W. G.; Y., Z.

doi:10.1016/j.carbon.2011.12.034

Cited by 276 publications

(82 citation statements)

References 32 publications

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“…49 As such, degradation of strength with MoTe 2 content is to be expected given the platelet aggregation observed in Fig 1E. The strain at break also decreases relatively uniformly with increased levels of MoTe 2 . This behaviour has been observed for several other MMCs 9,24,25,28,30,32,34 and indeed polymer nano-composite materials 7,13,48,[50][51][52][53][54][55] .…”

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confidence: 70%

“…Previous studies have observed strength increases at relatively low loading level followed by a falloff at higher filler content for MMCs filled with both carbon nanotubes 25,26,32 and graphene 24 . A strength decrease, often at higher loading levels is commonly observed for nanomaterial-filled polymer composites.…”

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confidence: 92%

“…Of nanomaterial-reinforced MMCs, much attention has been devoted to using carbon nanotubes (CNTs) to reinforce metals. [23][24][25][26][27][28][29][30][31][32][33][34][35][36] Additionally, Boron Nitride nanotubes have been used to reinforce aluminium. 37 Only recently have reports surfaced where two dimensional filler materials have been utilised in MMCs.…”

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confidence: 99%

“…9 However, there is reason to believe that inorganic 2D materials may offer some advantages as fillers in MMCs. Several accounts from the literature highlight the presence of aggregation of CNTs either on the metal surface [30][31][32] or within fissures in the metal matrix 35 . Such agglomerations may arise due to large density differences between filler and matrix phases within the composite resulting in buoyancy-induced separation during mixing in the molten state.…”

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Reinforcement of metal with liquid-exfoliated inorganic nano-platelets

May

Khan

Coleman

2013

Applied Physics Letters

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We have prepared metal matrix composites (MMCs) of a pewter alloy filled with liquid-exfoliated Molybdenum Telluride (MoTe 2 ) nano-platelets. The combination of MoTe 2 and pewter was chosen due to their near-identical densities, thus reducing the scope for buoyancy-induced separation during melt mixing. The addition of nanofiller results in a doubling of the Young's modulus, Y, for a volume fraction, V f , of <1 % MoTe 2 , corresponding to a reinforcement of dY/dV f =110 GPa. We find that this degree of reinforcement to be reasonably consistent with that predicted by a simplified version of Halpin-Tsai theory.Over the last decade, the study of 2-dimensional (2D) nano-materials has become one of the most active areas of nanoscience. Since the discovery of graphene 1 and more recently, the surge of interest in inorganic 2D materials, 2-4 such nanostructures have been used to demonstrate a host of applications in areas from composites to energy storage to optoelectronics. 2-5 Particularly important will be applications which harness the impressive mechanical properties of 2D nano-materials. It is well known that graphene is the strongest, stiffest material known to man with strength and elastic modulus values of 130 and 1000 GPa respectively. 6 Indeed graphene nanosheets have been used in a number of mechanical applications particularly as a reinforcing filler in composites. 7-9 Less well known is the fact that boron nitride (BN) nanosheets display very similar mechanical properties to graphene. 10 Indeed a host of 2D nano-materials have Young's moduli which surpass 100 GPa. 11 Perhaps more importantly these materials may have strengths 11 as high as 36 GPa (estimated for layered WO 2 assuming its strength,  B , and modulus, Y, scale in a manner similar to MoS 2 : Y=11.7 B ) 12 . However, to the author's knowledge only three papers describe using inorganic 2D materials to mechanically reinforce any matrices; in all cases reinforcement of polymer matrices with BN nanosheets. [13][14][15] In many ways this is surprising. It was recently shown that a range of layered compounds can be exfoliated by sonication in liquids to give large quantities of 2D nanosheets. [16][17][18][19] The advantage of such liquid processing is that the resultant suspensions can be used to make a range of materials and structures including composites. 3 Because of the exceptional mechanical properties of 2D materials, 11 we would expect such composites to display enhanced mechanical properties.The vast majority of reports on nano-composites describe using nano-materials to reinforce polymer matrices. 8 Yet, many other types of composites exist; including for

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confidence: 92%

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confidence: 99%

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Reinforcement of metal with liquid-exfoliated inorganic nano-platelets

May

Khan

Coleman

2013

Applied Physics Letters

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“…MWCNT dispersion into the matrix materials is a typical task, as there is a possible formation of bundled clusters of the reinforcement. This is usually happens because of their large aspect ratios and the strong Vander forces [6]. The clustering of MWCNTs in the composites results into poor mechanical properties.…”

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confidence: 99%