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Substrate roughness and thickness effects on cold spray nanocrystalline Al−Mg coatings

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Abstract

Nanocrystalline Al−Mg coatings were produced using the cold gas dynamic-spraying technique. Unsieved Al−Mg powder of average nanocrystalline grain size in the range of 10 to 30 nm and with a particle size distribution from 10 to >100 μm was used as the feedstock powder. The resulting coatings were evaluated using scanning electron microscopy (SEM), transmission electron microscopy, as well as microhardness and nanoindentation measurements. Coating observations suggest that the wide particle size distribution of the feedstock powder has a detrimental effect on the coating quality but that it can be successfully mitigated by optimizing the spraying parameters. Nanohardness values close to 3.6 GPa were observed in both the feedstock powder and coatings, suggesting the absence of cold-working hardening effects during the process. The effects of the substrate surface roughness and thickness on coating quality were investigated. The deposited mass measurements performed on the coatings showed that the effect of using different grit sizes for the substrate preparation is limited to small changes in the deposition efficiency of only the first few layers of deposited material. The SEM observation showed that the substrate surface roughness has no significant effect on the macrostructures and microstructures of the coating. The ability to use the cold gas dynamic spraying process to produce coatings on thin parts without noticeable substrate damage and with the same quality as coatings produced on thicker substrates was demonstrated in this work.

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Authors and Affiliations

  1. Department of Mechanical of Engineering, University of Ottawa, ON, Canada

    P. Richer & B. Jodoin

  2. Department of Chemical Engineering and Materials Science, University of California, 95616-5294, Davis, CA

    L. Ajdelsztajn

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  1. P. Richer
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  2. B. Jodoin
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  3. L. Ajdelsztajn
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Additional information

The original version of this paper was published in the CD ROM Thermal Spray Connects: Explore Its Surfacing Potential, International Thermal Spray Conference, sponsored by DVS, ASM International, and IIW International Institute of Welding, Basel, Switzerland, May 2–4, 2005, DVS-Verlag GmbH, Düsseldorf, Germany.

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Richer, P., Jodoin, B. & Ajdelsztajn, L. Substrate roughness and thickness effects on cold spray nanocrystalline Al−Mg coatings. J Therm Spray Tech 15, 246–254 (2006). https://doi.org/10.1361/105996306X108174

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  • DOI: https://doi.org/10.1361/105996306X108174

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