Formation of Carbides in the Aluminum Matrix Composites Reinforced by Multi-Walled Carbon Nanotubes

Enormous work has been conducted on the strengthening behavior of aluminum-multi-walled carbon nanotubes(MWCNTs) composites by powder metallurgy. Generally, MWCNTs are individually dispersed and mechanically interlocked in the aluminum matrix of Al/MWCNT composites and they thermally diffuse to form...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Shin, Seeun, Kang, Heon, Bae, Donghyun
Format: Article
Language:English
Subjects:
Aluminum
Aluminum carbides
Aluminum matrix composites
Annealing
Carbides
Diffusion
Dispersion
Nanostructure
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Summary:Enormous work has been conducted on the strengthening behavior of aluminum-multi-walled carbon nanotubes(MWCNTs) composites by powder metallurgy. Generally, MWCNTs are individually dispersed and mechanically interlocked in the aluminum matrix of Al/MWCNT composites and they thermally diffuse to form aluminum carbides from aluminum matrix during hot process. However, the process of the formation of carbides has not well attended. This study clearly explores the formation of carbides during heat treatment for the samples which damaged MWCNTs which thermally diffused more actively using argon containing 3% hydrogen atmosphere. While Al/MWCNT composite annealed at 500 degree C, the aluminum atoms decomposed from aluminum matrix and they diffused to individually dispersed MWCNTs to form aluminum carbides, then they occupied the interstitial sites of MWCNTs as a sphere. The hardness decreases when the composites are annealed for up to 3 h, and it gradually increases up to 24 h, significantly decreases as annealing time up to 72 h.
ISSN:0094-243X