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    Effect of heat-treatment on the thermal and mechanical stability of Ni/Al2O3 nanocrystalline coatings

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    Publication date
    2020-02-28
    Author
    Cooke, Kavian O.
    Khan, T.I.
    Shar, M.A.
    Keyword
    Co-electrodeposition
    Grain growth
    Heat treatment
    Nanocrystalline
    Sliding wear
    Rights
    (c) 2020 The Authors. This is an Open Access article distributed under the Creative Commons CC-BY license (https://creativecommons.org/licenses/by/4.0/)
    Peer-Reviewed
    Yes
    
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    Abstract
    Heat-treatment is a frequently used technique for modifying the physical and chemical properties of materials. In this study, the effect of heat-treatment on the mechanical properties, thermal stability and surface morphology of two types of electrodeposited coatings (pure-Ni and Ni/Al2O3) were investigated. The XRD analyses showed that the crystal structure of the as-deposited coating changes from slightly amorphous to crystalline as the heat-treatment temperature increases. The heat-treatment of both the pure-Ni and the Ni/Al2O3 coating caused an increase of the grain size within the coatings. However, the unreinforced Ni coating experienced a faster growth rate than the Ni/Al2O3 coating, which resulted in a larger average grain size. The temperature-driven changes to the microstructure of the coatings caused a reduction in the hardness and wear resistance of the coatings. The presence of nanoparticles within the Ni/Al2O3 coating can successfully extend the operational temperature range of the coating to 473 K by pinning grain boundaries.
    URI
    http://hdl.handle.net/10454/18198
    Version
    Published version
    Citation
    Cooke KO, Khan TI and Shar, MA (2020) Effect of heat-treatment on the thermal and mechanical stability of Ni/Al2O3 nanocrystalline coatings. Journal of Manufacturing and Materials Processing. 4(1): 17.
    Type
    Article
    Collections
    Engineering and Informatics Publications

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