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A comparison of mechanical and wear properties of plasma sprayed carbon nanotube reinforced aluminum composites at nano and macro scale
, Anup Kumar Keshri, Arvind Agarwal
Published in
2011
Volume: 528
   
Issue: 9
Pages: 3375 - 3384
Abstract
The macro- and nano-scale mechanical and wear properties of carbon nanotube (CNT) reinforced Al-Si composite coatings prepared by plasma spraying have been compared in this paper. The composite coatings show a two phase microstructure; one phase being the Al-Si matrix with well dispersed CNTs and the other being the CNT clusters. Nanoindentation testing on the matrix portion with dispersed CNTs indicated an increase in the elastic modulus by 19% and 39% and an increase in the yield strength by 17.5% and 27% by the addition of 5. wt.% and 10. wt.% CNTs respectively. Macro-scale compression tests indicated no improvement in the elastic modulus but an increases in the compressive yield strength by 27% and 77% respectively, by addition of 5. wt.% and 10. wt.% CNTs. Nanoscratch testing carried out on the Al-Si matrix with dispersed CNTs indicated a decrease in scratch volume by 34% and 71% by addition of 5. wt.% and 10. wt.% CNTs respectively. Macro-scale wear tests indicated a decrease in the wear volume by 68% in case of 5. wt.% CNT coatings but an increase in the wear volume by 15% for the 10. wt.% CNT coating. The differences in mechanical and wear properties at nano and macro scales are explained in terms of the bimodal CNT dispersion (well dispersed and clusters) in Al-Si matrix, CNT cluster size and fraction and carbide formation. © 2011 Elsevier B.V.
About the journal
JournalMaterials Science and Engineering A
Open AccessNo
Concepts (35)
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    Aluminum matrix composites
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    CARBIDE FORMATION
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    Cluster sizes
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    CNT DISPERSION
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    Compression tests
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    Macro scale
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    Matrix
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    Multiscales
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    Nano scale
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    NANO-SCRATCH
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    NANOINDENTATION TESTING
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    PLASMA SPRAYED
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    REINFORCED ALUMINUM COMPOSITES
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    SI MATRIX
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    TWO-PHASE MICROSTRUCTURES
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    WEAR PROPERTIES
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    WEAR TEST
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    WEAR VOLUME
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    Well-dispersed
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    Yield strength
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    Aluminum
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    Carbides
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    Carbon nanotubes
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    Compression testing
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    Compressive strength
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    Elastic moduli
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    Mechanical properties
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    Nanoindentation
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    Plasma jets
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    Plasma spraying
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    Protective coatings
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    Silicon
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    Wear of materials
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    Yield stress
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    Composite coatings