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Fabrication and microstrain evolution of Al-TiB2 composite coating by cold spray deposition

Chen, H.; Pala, Zdenek; Hussain, T.; McCartney, D.G.

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Authors

H. Chen

Zdenek Pala

Profile image of TANVIR HUSSAIN

TANVIR HUSSAIN TANVIR.HUSSAIN@NOTTINGHAM.AC.UK
Professor of Coatings and Surface Engineering

D.G. McCartney



Abstract

This paper investigates the microstructure evolution of Al-TiB2 coatings prepared by cold spraying. In situ Al-TiB2 composite powders containing uniformly distributed titanium diboride (TiB2) particles with a size range of 5 to 100 nm in the Al matrix and Al/Al-TiB2 blended powders were used as the cold spray feedstock for coating fabrication on aluminium alloy substrates. The microstructures of the feedstock powders and as-deposited coatings were characterised using scanning electron microscopy with energy dispersive X-ray (EDX) analysis and X-ray diffraction (XRD). Al/Al-TiB2 blended powder coatings, compromising closely packed powder particles, were sprayed to an approximate thickness of 500 μm. Al-TiB2 composite coatings (approximately 50 μm thick) were obtained retaining the microstructure of the composite powders being sprayed and no evidence of detrimental phase transformation was found. However, micro-cracks were found to exist in the Al-TiB2 coating due to the hardly deformable powder particles. Little or no microstrain was revealed in the as-sprayed Al-TiB2 coating, indicating that annealing may have occurred due to the localised adiabatic heating during the spraying process. It is demonstrated that it is possible to fabricate the Al-TiB2 composite coating by cold spray deposition but further improvements to eliminate coating cracking are required.

Citation

Chen, H., Pala, Z., Hussain, T., & McCartney, D. (in press). Fabrication and microstrain evolution of Al-TiB2 composite coating by cold spray deposition. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, https://doi.org/10.1177/1464420717690559

Journal Article Type Article
Acceptance Date Jan 4, 2017
Online Publication Date Jan 29, 2017
Deposit Date Feb 3, 2017
Publicly Available Date Feb 3, 2017
Journal Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Print ISSN 1464-4207
Electronic ISSN 2041-3076
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1177/1464420717690559
Keywords Aluminium matrix composite, cold spray, Al-TiB2, cracking, microstrain
Public URL https://nottingham-repository.worktribe.com/output/838713
Publisher URL http://journals.sagepub.com/doi/10.1177/1464420717690559
Contract Date Feb 3, 2017

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