Influence of Carbon Nanotubes on Mechanical Properties of Cast Aluminum, Grade A5

Composite materials on the basis of A5 aluminum containing 0.01–0.1 wt % of carbon nanotubes (CNT) were obtained. The composite materials were fabricated by sand casting. Carbon nanotubes were added to the aluminum melt in the form of powdered mixture preliminarily produced using an AGO2S planetary...

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Bibliographic Details
Published in:Inorganic materials : applied research 2018, Vol.9 (2), p.270-278
Main Authors: Alekseev, A. V., Dubov, D. Yu, Predtechenskiy, M. R.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum carbide
Ball milling
Carbon
Carbon nanotubes
Chemistry
Chemistry and Materials Science
Composite materials
Contact melting
Dislocations
General Purpose Materials
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Mathematical analysis
Mechanical properties
Nanotubes
Sand casting
Ultimate tensile strength
Yield strength
Yield stress
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Summary:Composite materials on the basis of A5 aluminum containing 0.01–0.1 wt % of carbon nanotubes (CNT) were obtained. The composite materials were fabricated by sand casting. Carbon nanotubes were added to the aluminum melt in the form of powdered mixture preliminarily produced using an AGO2S planetary ball mill. It was demonstrated that the CNT additions improved the ultimate tensile strength and yield strength of cast metal by 9 and 32%, respectively. The improvement of metal strength properties even at such a minor amount of nanotubes is determined not only by the inoculating effect but also by dispersion, dislocation, and, to a lesser extent, by reinforcing mechanisms of strengthening. For CNT content in aluminum equal to 0.01 wt %, the calculated yield strength agrees well with experimental values, whereas for CNT content equal to 0.05 and 0.1 wt %, the obtained strengthening is significantly lower than calculations, which can be attributed to agglomeration of nanotubes. The degree of conversion of carbon nanotubes into aluminum carbide as a consequence of interaction with aluminum melt is analyzed. It is demonstrated that less than 50% of carbon nanotubes are transformed into aluminum carbide during melting at 700–800°C. The fact that CNTs are not completely converted into carbide can be attributed to the fact that CNTs are arranged into bundles and only top layer of CNTs is in contact with the melt.
ISSN:2075-1133
2075-115X
DOI:10.1134/S2075113318020028