Microstructural Characterization and Consolidation of Severely Deformed Copper Powder Reinforced with Multiwalled Carbon Nanotubes

Akbarpour, M.R.; Salahi, E.

doi:10.12693/aphyspola.127.1722

Cited by 9 publications

(3 citation statements)

References 17 publications

(9 reference statements)

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“…Although similar regarding powder size progression, powder morphology of Cu-CNT-dry (Figure 6) and Cu-CNT-wet [Figures 8(a)-(j)] systems evolves differently: in the absence of isopropyl alcohol the powders appear to acquire plate-like instead of equiaxed shape, in good agreement with results by other authors (Akbarpour and Salahi, 2015; Liu et al , 2012; Shukla et al , 2013).…”

Section: Resultssupporting

confidence: 87%

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Nanostructured copper-carbon nanotubes composites for aircraft applications

Graça

Seixas

Ferro

et al. 2018

AEAT

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Purpose The reliable performance of critical components working under extreme conditions is paramount to the safe operation of aircraft, and material selection is critical. Copper alloys are an obvious choice for such applications whenever a combination of transport, mechanical and tribological properties is required. However, low strength and hardness issues require development of new copper alloys and composites to improve service life and reliability. This study aims to investigate the effect of carbon nanotubes as reinforcement phase in copper-matrix composites. Design/methodology/approach The development of novel copper-based composites refined to the nanoscale was envisaged through mechanical milling of mixtures containing copper and carbon nanotubes (2 Wt.%). Milling took place in a planetary ball mill for times varying between 1 h and 16 h at 400 rpm. A ball-to-powder ratio of 20:1 and alumina vial and copper spheres were used under dry conditions or with addition of isopropyl alcohol. Scanning electron microscopy/energy dispersive spectroscopy, size distribution, Raman spectroscopy and X-ray diffraction were used to study the produced powders. Findings Attained results show that mechanical milling of the studied system produces nanostructured powders containing second-phase carbon nanotubes homogeneously distributed in the metallic matrix, together with severe copper grain refinement. This should correspond to increased residual microstresses, envisaging significant improvement of mechanical properties of the produced copper composites. Originality/value The novelty of the work resides in the use of carbon nanotubes for the reinforcement of copper, and on the systematic microstructural characterisation of the produced composites.

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Section: Resultssupporting

confidence: 87%

“…93 per cent decrease compared to as-supplied copper). The achieved small copper crystallite size should correspond to increased residual microstress, envisaging significant improvement of mechanical properties (Akbarpour and Salahi, 2015).…”

Section: Resultsmentioning

confidence: 99%

Nanostructured copper-carbon nanotubes composites for aircraft applications

Graça

Seixas

Ferro

et al. 2018

AEAT

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“…If the nanotubes remain as clusters or agglomerates, the composite properties will be deteriorated [11][12]. In order to improve the dispersion of CNTs in a metal matrix, high energy mechanical milling can be used [13][14]. Another approach used to increase the dispersion of CNTs in the matrix material is a treatment in a mixture of acid prior to consolidation with metal powder [3,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Sintering and Dimensional Analysis of Cu/CNTs via a Powder Metallurgy Route

Shaari¹,

Ismail²,

Jumahat³

et al. 2020

JMechE

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Recently, carbon nanotubes (CNTs) reinforced metal matrix composites (MMCs) have attracted an increasing interest, due to their promising properties such as high Young’s modulus and tensile strength. CNTs are considered to be an attractive reinforcement material for lightweight and high-strength metallic matrix composites. When powder metallurgy (PM) is used to form these MMCs (such as Cu/CNTs composites), the sintering parameters are crucial in obtaining good final parts. This work attempts to investigate the effect of sintering parameters on physical properties in these MMCs. The process comprised of mixing of Cu powder with CNTs, compacting of the powder mixture to form green parts and sintering using a quartz tube furnace under argon atmosphere. In this study, four trials of heating rate were performed and evaluated before sintering process was conducted. Finally, the green body was initially heated isothermally at 100°C for 1 hour with heating rate of 1.0 °C/min and sintered at a temperature of 900°C for 2 hours with heating rate of 0.5 °C/min. The composites contained 0 to 4 vol% of pristine CNTs (PCNTs) and acid treatment CNTs (ACNTs), respectively. It was observed that as the CNTs content increased, the density of the composites was also decreased owing to low density of the CNTs. The sintered part in this present work has undergone volume shrinkage ranging from 12.41% to 17.02% and 13.36% to 19.30%, for Cu/PCNTs and Cu/ACNTs respectively. It was found that the heating rate played an important role in producing a good sintered part. A high heating rate induced large thermal stress and possibly increased the pore volume, leading to swelling. As part of the temperature sensitivity, the heating rate was useful in controlling microstructure evolution in sintering. A correlation between the volume shrinkage, density and porosity of the good sintered part was confirmed in this work.

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Analysis of Load Transfer Mechanism in Cu Reinforced with Carbon Nanotubes Fabricated by Powder Metallurgy Route

Akbarpour

2016

J. of Materi Eng and Perform

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Microstructural Characterization and Consolidation of Severely Deformed Copper Powder Reinforced with Multiwalled Carbon Nanotubes

Cited by 9 publications

References 17 publications

Nanostructured copper-carbon nanotubes composites for aircraft applications

Nanostructured copper-carbon nanotubes composites for aircraft applications

Sintering and Dimensional Analysis of Cu/CNTs via a Powder Metallurgy Route

Analysis of Load Transfer Mechanism in Cu Reinforced with Carbon Nanotubes Fabricated by Powder Metallurgy Route

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