Microstructure and hardness of copper–carbon nanotube composites consolidated by High Pressure Torsion

Jenei, Péter; Yoon, Eun Yoo; Gubicza, Jenő; Kim, Hyoung Seop; Lábár, János L.; Ungár, Tamás

doi:10.1016/j.msea.2011.02.066

Cited by 81 publications

(58 citation statements)

References 30 publications

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“…A similar trend was also observed for the shore hardness with increasing the Cu : C ratio in these nanocomposites, due to the lower hardness of Cu as compared to carbon material. 32 The electrical resistivity was calculated by eqn (1). The results clearly reveal that HTPAHs are highly resistive ($4.62 mU cm), compared to C-Cu nanocomposites (batches B and C), i.e.…”

Section: 31mentioning

confidence: 99%

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

et al. 2014

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A facile method of developing carbon-copper (C-Cu) nanocomposites by coating nanocrystalline Cu on heat-treated polyaromatic hydrocarbons (HTPAHs) has been reported. These synthesized nanocomposites have been extensively characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), a scanning electron microscope (SEM), and transmission electron microscopy (TEM). The synthesized HTPAHs-based C-Cu nanocomposites exhibit improved mechanical and electrical properties, which could be tailored by varying the Cu nanoparticle loading. The highest electromagnetic interference shielding effectiveness (EMI SE) due to absorption and reflection at 12.4 GHz is 46.1 dB and 12.5 dB, respectively, for a 2 mm thick sample resulting in a total shielding effectiveness of 58.7 dB. This observed shielding effectiveness in these C-Cu nanocomposites is far above the threshold shielding effectiveness required for techno-commercial applications, especially in the Ku band of RF.

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Section: 31mentioning

confidence: 99%

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

et al. 2014

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“…In this technique, a disk sample is located between two anvils rotating under a high pressure of ~2-8 GPa. Applying the high hydrostatic pressure during straining can hinder vacancy migration during deformation thereby retarding the annihilation mechanisms of dislocations [3]. Furthermore, it enables HPT method for consolidating metallic powders to produce densely-packed bulk materials.…”

Section: Introductionmentioning

confidence: 99%

“…Besides single phase metals, HPT has been also used to fabricate metal matrix composites (MMCs) reinforced with carbon nanostructures [3][4][5][6]. Carbon nanotubes (CNTs) are promising reinforcement phase in MMCs because of their high aspect ratio, high elastic modulus (>1 TPa) and high tensile strength (>30 GPa) [7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al-3 Vol% CNT Nanocomposites Processed by High-Pressure Torsion

Asgharzadeh

Kim

2017

Archives of Metallurgy and Materials

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Al-3 vol% CNT nanocomposites were processed by high-pressure torsion (HPT) at room temperature under the pressure in the range of 2.5-10 GPa for up to 10 turns. Optical microscopy, scanning electron microscopy, and transmission electron microscopy (TEM) were used to investigate the microstructural evolutions upon HPT. Mechanical properties of the HPT-processed disks were studied using tensile tests and microhardness measurements. The results show gradual evolutions in the density, microstructure, and hardness with increasing the number of turns and applied presure. Nanostructured and elongated Al grains with an average grain thickness of ~40 nm perpendicular to the compression axis of HPT and an aspect ratio of ~3 are formed after 10 turns under 6 GPa. Evaluating the mechanical properties of the 10-turn processed Al/CNT nanocomposites indicates a tensile strength of 321 MPa and a hardness of 122 Hv. The tensile fracture surface of the Al/CNT nanocomposite mostly demonstrates a smooth fracture manner with fine dimples resulting in a low tensile ductility of ~1.5%.

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“…high elastic modulus, low density, large aspect ratio) [40]. Metal matrixCNT composites are usually processed by powder metallurgy including the blending of CNTs with the powder of the metal matrix by highenergy milling and then the consolidation of the powder blend [41,42]. The latter step can be carried out by HPT, as in this case an UFG microstructure is achieved in the matrix, yielding a further enhancement of the yield strength.…”

Section: Methodsmentioning

confidence: 99%

Correlation between Processing Conditions, Lattice Defect Structure and Mechanical Performance of Ultrafine-Grained Materials

Gubicza

2015

Acta Phys. Pol. A

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The mechanical performance of ultrane-grained materials is strongly inuenced by the lattice defect structure, i.e. the vacancy concentration, the type, arrangement and density of dislocations, the planar fault probability, as well as the amount and character of grain boundaries. In this paper, the correlation between the processing conditions, the lattice defect structure and the plastic behavior of ultrane-grained materials is overviewed. For the processing route of severe plastic deformation, the inuence of applied strain, hydrostatic pressure, as well as melting point, stacking fault energy and alloying on grain size, dislocation density and strength is studied. For nanopowder sintering techniques, the eect of atmosphere, temperature and time of consolidation on lattice defects and mechanical properties is discussed in detail.

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Microstructure and hardness of copper–carbon nanotube composites consolidated by High Pressure Torsion

Cited by 81 publications

References 30 publications

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Microstructure and Mechanical Properties of Al-3 Vol% CNT Nanocomposites Processed by High-Pressure Torsion

Correlation between Processing Conditions, Lattice Defect Structure and Mechanical Performance of Ultrafine-Grained Materials

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