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Strengthening mechanisms in carbon nanotube-reinforced aluminum composites

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Title
Strengthening mechanisms in carbon nanotube-reinforced aluminum composites
Author(s)
Jong Gil Park; Dong Hoon Keum; Young Hee Lee
Publication Date
2015-12
Journal
CARBON, v.95, no., pp.690 - 698
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Although carbon nanotubes (CNTs) are used to reinforce aluminum alloys, the underlying strengthening mechanisms have not yet been clarified. Here, we focus on elucidating several of these mechanisms including load transfer, generation of dislocations from thermal mismatch, and the Orowan looping system to explain the enhanced mechanical properties of CNT-reinforced Al. The sample preparation procedure involves mechanically pulverizing Al in paraffin oil mixed with CNTs dispersed in dichloroethane. The mixture was then sintered and melt-blended to produce solid samples. The formation of covalent bonds (Al4C3) between Al and CNT walls was confirmed by X-ray diffraction, Raman spectroscopy, and transmission electron microscope measurements. The yield strength and tensile strength were improved by 60% and 23%, respectively, with the addition of 0.2 wt% CNTs. These enhancements corroborate well with the predicted values from the multiple strengthening mechanisms. © 2015 Elsevier Ltd. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2226
ISSN
0008-6223
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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