Study on the strengthening mechanisms of Cu/CNT nano-composites

Xiang, Ling; Bai, Yuanli; Algarni, Mohammed; Choi, Youngsik; Chen, Quanfang

doi:10.1016/j.msea.2015.08.012

Cited by 57 publications

(21 citation statements)

References 41 publications

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“…Finally, it should be noted that adhesion between the particle and the matrix results in a strengthening via the load transfer mechanism, which is due to the volume fraction and the aspect ratio of particles in a MMC. This eventually leads to a better transfer of stress from the matrix to the CNTs [59,60].…”

Section: Xrd Measurementsmentioning

confidence: 99%

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

et al. 2016

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In this work, carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composites are synthesized using Bc equal-channel angular extrusion (ECAP) route and their mechanical behavior is examined under compression and shear deformation. The results show that at room temperature, eight ECAP passes are necessary to achieve the density of the composite where the effect of CNTs in enhancing the mechanical properties become significant. Samples of pure Al are also processed under the same ECAP conditions, and their properties are further examined to facilitate the comparison. The well-densified composites with only 2 vol. % of CNTs exhibit an approximately 30% increase in yield strength compared to the pure Al samples. Microstructure data in terms of porosity volume fraction, crystallite size, and dislocation density, along with the residual lattice strain measurements, are used to explain the observed improvements in strength. As measured by X-ray diffraction (XRD), higher levels of dislocation density, smaller crystallite sizes, and larger residual lattice strains are present in Al-CNT than in pure Al samples. Finally, fractographic analysis using scanning electron microscopy is performed revealing that the fracture surfaces of the composite exhibit a more brittle behavior than pure Al samples.

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Section: Xrd Measurementsmentioning

confidence: 99%

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

et al. 2016

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“…The other one is that CNTs and CNTs, CNTs and copper, copper and copper are interconnected, forming 3D network structure, which increases the resistance to dislocation motion, and reduces the peeling speed and slows the destruction rate of materials. Meanwhile, the strengthening and toughening effect of carbon nanotubes hinders the extension of cracks [32]. The conductivity of the 3D interconnected CNTs/Cu composites and CuCr was measured by eddy current Table 1.…”

Section: Microstructural Characterization Of the 3d Interconnected Cnmentioning

confidence: 99%

Preparation and properties of 3D interconnected CNTs/Cu composites

Chen

et al. 2020

Nanotechnology Reviews

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AbstractIn this paper, the 3D pore structure of CuCr powders were obtained by pre-press shaping process, and finally the 3D interconnected carbon nanotubes/copper (CNTs/Cu) composites with excellent properties were insitu synthesized by chemical vapor deposition (CVD) and spark plasma sintering (SPS) technique. The morphology and structure of CNTs/ Cu composites are characterized by scanning electron microscopy (SEM), Raman spectra, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the results showed that the quality of CNTs and the interfacial bonding strength of CNTs/ Cu composites can be improved owing to the 3D pore structure. Meanwhile, the 3D pore structure was favorable to avoid pollution of CNTs during the synthesis process. The tensile strength of CNTs/ Cu composites increased to 421.2 MPa, with 47.6% enhancements compared to CuCr. Furthermore, the coefficient of friction (COF) reduced to 0.22 and the corrosion resistance were increased by 51.86% compared to CuCr. Consequently, our research provides a novel and an effective method for the synthesis of high quality CNTs/ Cu composites.

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“…Three strengthening mechanisms have been reported to govern enhanced mechanical properties of Al-CNT composites: load transfer, generation of dislocations by thermal mismatch, and stored dislocations resulting from severe plastic deformation [11][12][13][14]16]. The strengthening via load transfer mechanism is due to volume fraction and aspect ratio of particles in a metal matrix composite.…”

Section: Hardness Of Al and Al-cnt Composites Processed By Ecapmentioning

confidence: 99%

“…Critical to the realization of such materials with improved properties is the development of fabrication techniques providing a homogeneous dispersion of nanotubes in the metallic matrix. As a result of fabrication, these materials are usually nanostructured in terms of not only CNTs distribution but also in terms of grain size distribution, which provides another strengthening mechanism originating from large content of grain boundary area defects and dislocation substructures [11][12][13][14]. To date, a number of nano-materials have been synthesized to exit in the form of atomic clusters or nano-particles [15][16][17], nano-crystallines [18][19][20], nano-rods [21][22][23], nano-tubes [24,25], and nano-layers [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of carbon nanotubes reinforced aluminum matrix composites synthesized via equal-channel angular pressing

Zare

Jahedi

Toroghinejad

et al. 2016

Materials Science and Engineering: A

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a b s t r a c tIn this work, 2 vol% carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composites of superior microstructural homogeneity are successfully synthesized using Bc equal-channel angular extrusion (ECAP) route. The key step in arriving at high level of homogeneous distribution of CNTs within Al was preparation of the powder using simultaneous attrition milling and ultra-sonication processes. Microstructure as revealed by electron microscopy and absence of Vickers hardness gradients across the material demonstrate that the material reached the homogeneous state in terms of CNT distribution, porosity distribution, and grain structure after eight ECAP passes. To facilitate comparison of microstructure and hardness, samples of Al were processed under the same ECAP conditions. Significantly, the composite containing only 2 vol% exhibits 20% increase in hardness relative to the Al samples.

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Study on the strengthening mechanisms of Cu/CNT nano-composites

Cited by 57 publications

References 41 publications

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation

Preparation and properties of 3D interconnected CNTs/Cu composites

Microstructure and mechanical properties of carbon nanotubes reinforced aluminum matrix composites synthesized via equal-channel angular pressing

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