Deposition Mechanism and Microstructure of Laser-Assisted Cold-Sprayed (LACS) Al-12 wt.%Si Coatings: Effects of Laser Power

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Author list: Olakanmi EO, Tlotleng M, Meacock C, Pityana S, Doyoyo M

Publisher: Springer

Place: NEW YORK

Publication year: 2013

Journal: JOM: The Journal of the Minerals, Metals and Materials Society (1047-4838)

Journal acronym: JOM-US

Volume number: 65

Issue number: 6

Start page: 776

End page: 783

Number of pages: 8

ISSN: 1047-4838

eISSN: 1543-1851

Languages: English-Great Britain (EN-GB)

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Abstract

Surface treatment is one of the most costly processes for treating metallic components against corrosion. Laser-assisted cold spray (LACS) has an opportunity to decrease those costs particularly in transportation systems, chemical industries, and renewable energy systems. This article highlights some of those potential applications. In the LACS process, a laser beam irradiates the substrate and the particles, thereby softening both of them. Consequently, the particles deform upon impact at the substrate and build up a coating. To circumvent the processing problems associated with cold-spray (CS) deposition of low-temperature, corrosion-resistant Al-12 wt.%Si coatings, a preliminary investigation detailing the effect of laser power on its LACS deposition mechanism and microstructural properties is presented. The deposition efficiency, the microstructure, and the microhardness of the LACS-deposited coatings produced by a 4.4-kW Nd:YAG laser system were evaluated. The outcome of this study shows that pore- and crack-free Al-12 wt.%Si coatings were deposited via softening by laser irradiation and adiabatic shearing phenomena at an optimum laser power of 2.5 kW.

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