Microstructural Characterization of Carbon Nanotubes (CNTs)-Reinforced Nickel Matrix Nanocomposites

Simões, Sónia; Carneiro, Íris; Viana, Filomena; Reis, M. A.; Vieira, Manuel F.

doi:10.1017/s1431927618015064

Cited by 9 publications

(26 citation statements)

References 24 publications

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“…Similar results have already been reported in Ni-CNT nanocomposites [5], where these colour gradients were associated with the formation of dislocation cells. These results showed that the presence of CNTs did not induce significant microstructural changes during the dispersion/mixture and pressing processes.…”

Section: Resultssupporting

confidence: 90%

“…After sintering, Ni samples showed larger grain sizes than those of nanocomposites, confirming that the presence of CNTs influences the grain growth of the matrix during sintering [39]. In our previous study [5], the presence of CNTs in the Ni matrix also induced microstructural changes in the nanocomposite during the powder metallurgy process. The nanocomposites, unlike the samples without CNTs, exhibited a dense dislocation structure, whereas the pure Ni consisted mainly of recrystallized grains with their associated low dislocation density.…”

Section: Introductionmentioning

confidence: 62%

“…MMNCs are good candidates for wide use in components for various sectors, such as the automotive and aerospace industries [3,4]. Ni [3,4,5,6], Cu [7,8,9,10] and Al [11,12,13,14] represent the materials most commonly studied as matrices of these nanocomposites, due to the nanoreinforcements’ strengthening potential, thus becoming advantageous alternatives to conventional materials. Among the various nanoreinforcements investigated, carbon nanotubes (CNTs) have aroused great interest amongst the scientific community [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…MMNCs reinforced with CNTs can be produced using powder metallurgy routes [5,6,10,17,18,19]. However, the expected improvement in properties was not fully achieved, due to several factors.…”

Section: Introductionmentioning

confidence: 99%

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EBSD Analysis of Metal Matrix Nanocomposite Microstructure Produced by Powder Metallurgy

et al. 2019

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The development of metal nanocomposites reinforced by carbon nanotubes (CNTs) remains a focus of the scientific community due to the growing need to produce lightweight advanced materials with unique mechanical properties. However, for the successful production of these nanocomposites, there is a need to consolidate knowledge about how reinforcement influences the matrix microstructure and which are the strengthening mechanisms promoting the best properties. In this context, this investigation focuses on the study of the reinforcement effect on the microstructure of an Ni-CNT nanocomposites produced by powder metallurgy. The microstructural evolution was analysed by electron backscattered diffraction (EBSD). The EBSD results revealed that the dispersion/mixing and pressing processes induce plastic deformation in the as-received powders. The dislocation structures produced in those initial steps are partially eliminated in the sintering process due to the activation of recovery and recrystallization mechanisms. However, the presence of CNTs in the matrix has a significant effect on the dislocation annihilation, thus reducing the recovery of the dislocation structures.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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EBSD Analysis of Metal Matrix Nanocomposite Microstructure Produced by Powder Metallurgy

et al. 2019

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“…The mixture and dispersion were ultrasonicated in isopropanol for 15 min, filtered and dried. The powder mixtures were pressed with 900 MPa and subsequently sintered at 950 • C under vacuum for 120 min, based on the conditions reported for the better ones described in previous studies [39][40][41].…”

Section: Methodsmentioning

confidence: 99%

Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites

Carneiro

Simões

2020

Materials

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The effect of using different carbon nanotubes (CNTs) on the production of nanocomposites was evaluated in this work. The investigated CNTs were multi-walled carbon nanotubes (MWCNTs) with different morphologies and structures. The main objective was to relate the results reported by numerical simulation with the results obtained experimentally in order to validate these methodologies. A detailed characterization of CNTs was carried out to establish the different main characteristics, such as inner and outer diameters, defects, structure and the number of walls. Metal matrix nanocomposites were produced using the powder metallurgy route. The experimental results show that the morphology and structure of MWCNTs have a significant effect on the dispersion process for nanocomposite production. Straight CNTs with a larger diameter and with few defects allow for the production of nanocomposites with uniform dispersion and strong interface bonding, leading to a higher hardness value. In addition, the CNT introduction into a metal matrix induces a change in the deformation behavior that plays an important role in the strengthening mechanisms. Although some aspects are not considered in the molecular dynamic (MD) simulation, such as the CNT random orientation and CNT agglomeration, some comparative relationships can be performed in order to validate some methodologies. While the structure and morphology of the CNTs have a significant influence on the dispersion process, the influence of the diameter and the functionalization treatment on the properties of the nanocomposites is also identified. The experimental results show that the decrease in the diameter of the CNTs and the use of functionalized CNTs also contribute to the obtention of lower mechanical properties of the nanocomposites, as is pointed out in the results of MD carried out in nanocomposites.

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Removal of antimonite (Sb(III)) from aqueous solution using a magnetic iron-modified carbon nanotubes (CNTs) composite: Experimental observations and governing mechanisms

et al. 2022

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Microstructural Characterization of Carbon Nanotubes (CNTs)-Reinforced Nickel Matrix Nanocomposites

Cited by 9 publications

References 24 publications

EBSD Analysis of Metal Matrix Nanocomposite Microstructure Produced by Powder Metallurgy

EBSD Analysis of Metal Matrix Nanocomposite Microstructure Produced by Powder Metallurgy

Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites

Removal of antimonite (Sb(III)) from aqueous solution using a magnetic iron-modified carbon nanotubes (CNTs) composite: Experimental observations and governing mechanisms

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