Hardness of porous nanocrystalline Co-Ni electrodeposits

MA, C., WANG, S.C., WOOD, R.J.K., ZEKONYTE, J., LUO, Quanshun and WALSH, F.C. (2013). Hardness of porous nanocrystalline Co-Ni electrodeposits. Metals and Materials International, 19 (6), 1187-1192.

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    Abstract

    The Hall-Petch relationship can fail when the grain size is below a critical value of tens of nanometres. This occurs particularly for coatings having porous surfaces. In this study, electrodeposited nanostructured Co-Ni coatings from four different nickel electroplating baths having grain sizes in the range of 11-23 nm have been investigated. The finest grain size, approximately 11 nm, was obtained from a coating developed from the nickel sulphate bath. The Co-Ni coatings have a mixed face centred cubic and hexagonal close-packed structures with varying surface morphologies and different porosities. A cluster-pore mixture model has been proposed by considering no contribution from pores to the hardness. As the porosity effect was taken into consideration, the calculated pore-free hardness is in agreement with the ordinary Hall-Petch relationship even when the grain size is reduced to 11 nm for the Co-Ni coatings with 77±2 at% cobalt. The present model was applied to other porous nanocrystalline coatings, and the Hall-Petch relationship was maintained. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht. © KIM and Springer.

    Item Type: Article
    Uncontrolled Keywords: hardness; nanocrystalline; hall-petch relationship; porosity; Co-Ni; 0912 Materials Engineering; Materials
    Identification Number: https://doi.org/10.1007/s12540-013-6006-y
    Page Range: 1187-1192
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 12 May 2020 16:31
    Last Modified: 12 May 2020 16:45
    URI: http://shura.shu.ac.uk/id/eprint/26057

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