Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites

Carneiro, Íris; Simões, Sónia

doi:10.3390/ma13235557

Cited by 14 publications

(19 citation statements)

References 51 publications

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“…In Figure 2, it is possible to observe the optical microscopy images for the samples heat-treated at 1100 • C for 30 min. As already mentioned in previously published research [24,26,27], nanocomposites exhibit the CNT clusters mainly at the grain boundaries and pores. In the OM images, the pores and CNTs clusters can be identified as the dark phase.…”

Section: Resultssupporting

confidence: 63%

“…The relative densities of the Ni and Ni-CNT samples are 0.824 and 0.785, respectively. previously published research [24,26,27], nanocomposites exhibit the CNT clusters mainly at the grain boundaries and pores. In the OM images, the pores and CNTs clusters can be identified as the dark phase.…”

Section: Resultsmentioning

confidence: 73%

“…The nanocomposites used in this research were produced by powder metallurgy. Nickel powder was provided by Goodfellow Cambridge Ltd. (Huntingdon, UK) and multi-walled carbon nanotubes (MWCNTs) were obtained from Fibermax Nanocomposites Ltd. (London, UK), which were already characterized in previous research [ 14 , 24 , 25 , 26 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

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Heat-Treated Ni-CNT Nanocomposites Produced by Powder Metallurgy Route

Carneiro

Simões

2021

Materials

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Nickel nanocomposites reinforced by carbon nanotubes (Ni-CNTs) are one of the possible candidates for applications in highly demanding industries such as the automotive and aerospace industries. As is well known, one of the limitations on the use of some materials in these applications is thermal stability. Some components in these industries are frequently subjected to high temperatures, which is crucial to understanding their microstructures and, consequently, their mechanical properties. For this reason, the main objective of this research is to understand the microstructural evolution of Ni-CNTs nanocomposites when subjected to heat treatment. The nanocomposites with varying levels of CNT content were produced by powder metallurgy, and unreinforced nickel was used for comparison purposes under the same conditions. The dispersion of CNTs, a critical aspect of nanocomposites production, was carried out by ultrasonication, which already proved its efficiency in previous research. The heat treatments were performed under high vacuum conditions at high temperatures (700 and 1100 °C for 30 and 120 min, respectively). Microhardness tests analyzed the mechanical properties while the extensive microstructural evaluation was conducted by combining advanced characterization techniques such as scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and high-resolution TEM. The obtained results are promising and show that the presence of CNTs can contribute to the thermal stability of the Ni-CNT nanocomposites produced.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 73%

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Heat-Treated Ni-CNT Nanocomposites Produced by Powder Metallurgy Route

Carneiro

Simões

2021

Materials

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“…However, as it can be seen in Figure 7, the nanocomposites produced presented, although few, some nanometric and very localized particles of Ni 3 C carbides. The explanation for this can be related to some deformation that occurred during the processing of the powders, which potentiate this formation, or even with the possible presence of Ni particles inside the carbon nanotubes, due to their production, as mentioned in previous works [37][38][39][40][41]. The presence of the Ni 3 C phase, even in small quantities, can contribute to the strengthening effect of the nanocomposites since it can improve the bonding between the CNT and the matrix, as well as act as an obstacle to the movement of dislocation and grain boundaries.…”

Section: Resultsmentioning

confidence: 74%

Investigation on the Strengthening Mechanisms of Nickel Matrix Nanocomposites

2021

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The strengthening effect of carbon nanotubes (CNTs) in metal matrix nanocomposites occurs due to several mechanisms that act simultaneously. The possible strengthening mechanisms for metal matrix nanocomposites reinforced with CNTs consist of: (1) load transfer, (2) grain refinement and texture strengthening, (3) second phase strengthening, and (4) strain hardening. The main focus of this work is to identify the strengthening mechanisms that play a role in the case of the Ni-CNT nanocomposite produced by powder metallurgy. For the dispersion and mixing of the metallic powders with CNTs, two different routes were performed by ultrasonication and ball milling. The results indicated that four different strengthening mechanisms are present in the nanocomposites and had a different contribution to the final mechanical properties. The load transfer and the increase in dislocation density seem to strongly affect the properties and microstructure of the nanocomposite. The grain refinement and the presence of second phase particles have a small contribution in the strengthening of this nanocomposite, since the introduction of CNTs in the Ni matrix slightly affects the size and orientation of the grains in the matrix and a few nanometric particles of Ni3C were identified.

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“…Carbon nano-tubes (CNTs) are well-known reinforcement in metal-matrix-nano-composites, due to their excellent mechanical properties such as superior tensile strength (150 GPa) and high elastic modulus (1TPa). Hence, CNTs have been extensively used to reinforce the nano-composites [19][20][21]. Significant increase in the mechanical properties of the commercially pure aluminum has been reported by Rikhtegar et.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of the Al-Mg/MWCNTs composite powders: The effects of ball milling process parameters

Ahmadian

2021

Preprint

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The effects of multi-walled carbon nano-tubes (MWCNTs) and the ball milling parameters on the mechanical properties of the Al-Mg alloy powders were investigated. Three different composite powders were synthesized through ball-milling process at different time and milling rates. The microstructural and phase analyses were carried out via scanning electron microscopy and X-ray diffraction spectroscopy, respectively. The results indicated that increasing the ball-milling time and rate would lead to the formation of finer particles, which consequently intensifies the plastic deformation and then, results in lower crystallite size. The morphological investigations indicated that while the MWCNTs agglomerates in lower milling rates, increased milling rate not only improve the distribution of the MWCNTs, but also decreases the length of the nano-tubes and promotes their diffusion into Al-Mg matrix. The formation of Al-Mg intermetallic phases through the ball-milling process of the composite powders was also confirmed via microstructural investigations.

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Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites

Cited by 14 publications

References 51 publications

Heat-Treated Ni-CNT Nanocomposites Produced by Powder Metallurgy Route

Heat-Treated Ni-CNT Nanocomposites Produced by Powder Metallurgy Route

Investigation on the Strengthening Mechanisms of Nickel Matrix Nanocomposites

Mechanical properties of the Al-Mg/MWCNTs composite powders: The effects of ball milling process parameters

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