Study of the structural defects on carbon nanotubes in metal matrix composites processed by severe plastic deformation

Aristizabal, Katherine; Katzensteiner, Andreas; Bachmaier, Andrea; Mücklich, Frank; Súarez, Sebastián

doi:10.1016/j.carbon.2017.09.075

Cited by 26 publications

(15 citation statements)

References 31 publications

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“…This can be traced back to the fact that, for the TTZ to be developed, plastic deformation must occur beneath the worn surface due to the application of cyclic shear stresses. In the case of Ni (Figure 8a,b), the deformed sample (20 T of HPT) already achieved the microstructural steady state, as previously discussed [34]. Therefore, it is expected that no further microstructural changes or strain hardening would take place during strain accumulation.…”

Section: Microstructure Under the Wear Scarsupporting

confidence: 65%

“…Lubricants 2019, 7, x FOR PEER REVIEW 8 of 10 already achieved the microstructural steady state, as previously discussed [34]. Therefore, it is expected that no further microstructural changes or strain hardening would take place during strain accumulation.…”

Section: Microstructure Under the Wear Scarmentioning

confidence: 62%

“…From the discussed results, the ultrafinegrained microstructures increase the oxidation activity of the surface due to a large grain boundary area. Moreover, even though the CNT distribution is significantly improved and the size of the agglomerates is significantly smaller in the deformed samples in comparison to the non-deformed samples [22], irreversible damage to the CNT is introduced by HPT [34] which renders them more susceptible to complete degradation and/or oxygen bonding. According to this, the CNT's ability to act as solid lubricants in the studied composites is strongly hindered.…”

Section: Wear Track Morphology and Tribo-chemical Mechanismsmentioning

confidence: 99%

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Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

et al. 2019

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Nickel (Ni) and carbon nanotube (CNT)-reinforced Ni-matrix composites were manufactured by solid state processing and severely deformed by high-pressure torsion (HPT). Micro-tribological testing was performed by reciprocating sliding and the frictional behavior was investigated. Tribo-chemical and microstructural changes were investigated using energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and focused ion beam (FIB). The CNT lubricity was hindered due to the continuous formation of a stable oxide layer promoted by a large grain boundary area and by irreversible damage introduced to the reinforcement during HPT, which controlled the frictional behavior of the studied samples. The presence of CNT reduced, to some extent, the tribo-oxidation activity on the contact zone and reduced the wear by significant hardening and stabilization of the microstructure.

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Section: Microstructure Under the Wear Scarsupporting

confidence: 65%

Section: Microstructure Under the Wear Scarmentioning

confidence: 62%

Section: Wear Track Morphology and Tribo-chemical Mechanismsmentioning

confidence: 99%

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Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

et al. 2019

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“…Due to its excellent properties, relatively low cost, and existence in various forms, carbon-based materials are widely used as reinforcing phase in the metal matrix composites [9][10][11][12][13]. Carbon-copper metal matrix composite (MMC) can be prepared using continuous copper graphite fibres by hot-pressing layers of metallic prepregs.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of graphite-reinforced copper matrix composites

Kumar

Mondal

2018

J Braz. Soc. Mech. Sci. Eng.

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In this study, copper matrix composites reinforced with graphite (5, 10, 15 wt%) were produced using powder metallurgy process. Milled powders were compacted under 637 MPa pressure to produce cylindrical specimens of approximate dimension of 10 mm diameter and 30 mm length. Cylindrical specimens were sintered under vacuum at 900, 950, 1000°C for 2 h holding time at highest temperature. Hardness and compression strength of composite samples were determined. The microstructures of specimens were investigated by optical microscope, scanning electron microscope and energydispersive spectroscopy. Homogeneous distribution of reinforcement phase in copper matrix composites was observed. Graphite reinforcement improved the compression strength of composites of around 108% with 5 wt%, around 34% with 10 wt% of reinforcement. However, significant decrease of compression strength was observed with 15 wt% of graphite reinforcement in the copper matrix. Reinforcement of graphite into copper matrix has improved the wear property of the composite materials.

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“…Accordingly, the influence of the highly energetic HPT process on the structure of the carbon nanotubes in the nickel matrix composites was studied in ref. [43]. Using Raman spectroscopy and analyzing the spectra [intensity ratio of the D and G band (ID/IG ratio), G ‐band width, and peak shifting], the structural state and the evolution of carbon nanotube deterioration were monitored as a function of the applied strain for nickel matrix composites containing different amounts of carbon nanotubes.…”

Section: Carbon Metal Compositesmentioning

confidence: 99%

Effect of Carbon in Severe Plastically Deformed Metals

2020

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In the last decades severe plastic deformation techniques have gained increasing interest as they allow the production of bulk nanostructured materials with superior mechanical and functional properties. However, because of mechanically induced grain boundary migration, the achievable grain size reduction is not indefinite but tends to stagnate once sufficient strain has been applied. Consequently, addition of solute elements or second phase particles offers the possibility to access the true nanocrystalline regime. Due to their low solubility and high mobility, interstitial elements are extremely effective at subduing boundary migration. Herein the effect of carbon on grain refinement and the resulting mechanical properties are summarized. As carbon may not only be added as graphite but could also be introduced in other forms or as allotropes such as nanotubes, nanodiamonds, or carbides, the respective advantages and problems associated with it are the center of discussion. Independent of the strategy used, strength levels hardly achievable with other alloying elements can be obtained. Moreover, as carbon does not have a negative effect on grain boundary cohesion, despite the enormous strength levels even ductility and toughness can be widely maintained.

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Study of the structural defects on carbon nanotubes in metal matrix composites processed by severe plastic deformation

Cited by 26 publications

References 31 publications

Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

Microstructure and properties of graphite-reinforced copper matrix composites

Effect of Carbon in Severe Plastically Deformed Metals

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