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Effect of heat-treatment on the thermal and mechanical stability of Ni/Al2O3 nanocrystalline coatings
Cooke, Kavian O. Khan, T.I. Shar, Muhammad A.
Cooke, Kavian O.
Khan, T.I.
Shar, Muhammad A.
Publication Date
2020-02-28
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(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/)
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2020-02-28
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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.
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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.
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