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Localised surface modification of high-strength aluminium–alumina metal matrix composite coatings using cold spraying and friction stir processing

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1080/17436753.2023.2227446
AuthorSearch for: ; Search for: 1ORCID identifier: https://orcid.org/0000-0001-7662-984X; Search for: 1ORCID identifier: https://orcid.org/0000-0002-1853-919X; Search for: ; Search for:
Affiliation
  1. National Research Council of Canada. Aerospace
FunderSearch for: Natural Sciences and Engineering Research Council of Canada under a Discovery Grant
FormatText, Article
Abstract
This study presents a novel approach for surface repairs of high-strength, cold-worked aluminium (Al) alloys, without negatively affecting the base material strength. Low-pressure cold spraying was used to fabricate Al–Al₂O₃ metal matrix composite overlays, with varying concentrations of Al₂O₃ deposited on an Al alloy. Friction stir processing (FSP) was employed to disperse and consolidate the overlay coating on the base material. The FSP was found to improve the Al₂O₃ particle distribution in the coating and reduce the mean free path between Al₂O₃ particles. The coating hardness increased after FSP. The post-FSPed overlays also exhibited lower wear rates compared to the as-sprayed condition. Remarkable improvement was observed in the tensile properties of the coatings, which were attributed to the improved dispersion of Al₂O₃ particles in the matrix, while the enhanced ductility was attributed to the possible grain refinement that occurred due to the recrystallisation of Al during FSP.
Publication date
PublisherSAGE Publications
Institute of Materials, Minerals and Mining (UK)
In
  • Advances in Applied Ceramics: Structural, Functional and Bioceramics 122, no. 3-4 (May 2023): 181–196.
LanguageEnglish
Peer reviewedYes
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Record identifier8a8a2bf2-4cf1-4e0a-a2f4-bb445acba8a5
Record created2024-09-06
Record modified2024-09-06
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