Journal ArticleDOI
Effect of Carbon Nanotube Dispersion on Mechanical Properties of Aluminum-Silicon Alloy Matrix Composites
Prathap Chandran,Tadepalli Sirimuvva,Niraj Nayan,A.K. Shukla,S. V. S. Narayana Murty,S. L. Pramod,S.C. Sharma,Srinivasa R. Bakshi +7 more
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In this paper, a study has been carried out to reinforce the commonly believed fact that the dispersion of carbon nanotubes in a composite has a profound effect on the properties of the composite.Abstract:
This study has been carried out to reinforce the commonly believed fact that the dispersion of carbon nanotubes in a composite has a profound effect on the properties of the composite. In this study, ball milling was carried out using two different parameters to obtain distinctly different degrees of dispersion of carbon nanotubes (4 wt.%) in Al-9 wt.% Si powders. Composite disks, 80 mm in diameter, having good and bad dispersions of carbon nanotubes were obtained by hot pressing. Optical micrographs and Raman spectroscopy images showed the presence of larger carbon nanotube clusters in the bad dispersion sample. Transmission electron microscopy images confirmed the presence of large clusters in the bad dispersion sample, while the good dispersion sample showed individual carbon nanotubes in the Al matrix. Nanoindentation results indicated a 41% increase in the hardness and a 27% increase in the elastic-to-plastic work ratio, while compression tests indicated a 185% increase in compression yield strength and a 109% increase in fracture strength with improvement in carbon nanotube’s dispersion.read more
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Journal ArticleDOI
Tensile properties of carbon nanotubes reinforced aluminum matrix composites: A review
M. Jagannatham,Prathap Chandran,S. Sankaran,Prathap Haridoss,Niraj Nayan,Srinivasa R. Bakshi +5 more
TL;DR: A review of the tensile properties of carbon nanotube reinforced aluminium matrix (Al-CNT) composites can be found in this article, where various processing routes for fabrication of AlCNT composites have been compared in terms of the resulting microstructure, degree of CNT dispersion, extent of interfacial reaction and its effect on the tensil properties.
Journal ArticleDOI
Manufacturing of cast A356 matrix composite reinforced with nano- to micrometer-sized SiC particles
TL;DR: In this paper, large micron-sized SiC particles were fragmented via ball-milling process in the presence of iron and nickel powders, separately, to fabricate composite powders of Fe-SiC and Ni−SiC.
Journal ArticleDOI
Exploring the reinforcing effect of TiC and CNT in dual-reinforced Al-matrix composites
TL;DR: In this article, the authors used a combination of mechanical milling and spark plasma sintering (SPS) techniques to construct a dual-reinforced Al/CNT composite.
Journal ArticleDOI
Mechanical and Tribological Behavior of Multiwalled Carbon Nanotubes-Reinforced AA7075 Composites Prepared by Powder Metallurgy and Hot Extrusion
TL;DR: In this article, a pin-on-disk method was used to evaluate dry sliding wear properties of hot-extruded carbon nanotubes-reinforced AA7075 composites and showed that the wear mechanism was plowing in the initial stages which was transformed to severe sliding and chipping with increasing load and temperature.
Journal ArticleDOI
Correlation between process and silica dispersion/distribution into composite: Impact on mechanical properties and Weibull statistical analysis
Alexandra Siot,Claire Longuet,Romain Léger,Belkacem Otazaghine,Patrick Ienny,Anne-Sophie Caro-Bretelle,Nathalie Azema +6 more
TL;DR: In this article, a methodology for controlling and monitoring particle dispersion at each step of composite manufacturing is proposed, which is based on Weibull statistical analysis and shows the impact of this dispersion state on ultimate stress.
References
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Journal ArticleDOI
Unusually High Thermal Conductivity of Carbon Nanotubes
TL;DR: An unusually high value, lambda approximately 6600 W/m K, is suggested for an isolated (10,10) nanotube at room temperature, comparable to the thermal conductivity of a hypothetical isolated graphene monolayer or diamond.
Journal ArticleDOI
Perspectives on Carbon Nanotubes and Graphene Raman Spectroscopy
TL;DR: Raman spectroscopy is shown to provide a powerful tool to differentiate between two different sp(2) carbon nanostructures (carbon nanotubes and graphene) which have many properties in common and others that differ.
Journal ArticleDOI
Metal matrix composites – From science to technological significance
TL;DR: The metal matrix composites (MMCs) have been transformed from a topic of scientific and intellectual interest to a material of broad technological and commercial significance over the past two decades as mentioned in this paper.
Journal ArticleDOI
Carbon nanotube reinforced metal matrix composites - a review
TL;DR: In this paper, a review summarises the research work carried out in the field of carbon nanotube (CNT) metal matrix composites (MMCs), focusing on the critical issues of CNT-reinforced MMCs that include processing techniques, nanotubes dispersion, interface, strengthening mechanisms and mechanical properties.
Journal ArticleDOI
Measurements of near-ultimate strength for multiwalled carbon nanotubes and irradiation-induced crosslinking improvements.
Bei Peng,Mark A Locascio,Peter Zapol,Shuyou Li,Steven L. Mielke,George C. Schatz,Horacio D. Espinosa +6 more
TL;DR: Multiwalled carbon nanotubes with a mean fracture strength >100 GPa are reported, which exceeds earlier observations by a factor of approximately three and are in excellent agreement with quantum-mechanical estimates for nanot tubes containing only an occasional vacancy defect, and are approximately 80% of the values expected for defect-free tubes.
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