Abstract
A novel electroformed nanocrystalline nickel cobalt alloy (n-NiCo) developed for sheet metal applications was investigated in terms of microstructure, as well as mechanical, thermal stability, and corrosion properties. The as-received material with a grain size of 18 ± 5 nm exhibited enhanced hardness compared with conventional polycrystalline NiCo mainly due to the Hall–Petch strengthening effect. Differential scanning calorimetry and annealing treatment results revealed that the n-NiCo was stable up to 200 °C for at least 1 h, and the onset of abnormal grain growth was observed when the material was annealed to 250 °C. While low-temperature annealing treatment was shown to increase the hardness of the material slightly, annealing at temperatures of 300 °C and above resulted in a reduction in hardness due to rapid normal grain growth. The n-NiCo sheet exhibited mixed Ni/Co anodic polarization behavior in environments of varying pH.
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TEM and SEM characterizations were performed at the Ontario Centre for the Characterization of Advanced Materials (OCCAM). We thank Dr. R. Acosta and Dr. D. Grozea for their contributions to this work. Financial support from the Natural Sciences and Engineering Research Council of Canada is gratefully acknowledged.
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JK and MS contributed to conceptualization, methodology, formal analysis, investigation, writing—original draft, writing—review and editing, project administration. LM and JT contributed to investigation, formal analysis, writing—review and editing. JLM and GP contributed to investigation, resources, writing—review and editing.JH contributed to investigation, writing—review and editing. UE contributed to conceptualization, investigation, writing—original draft, writing—review and editing, supervision, project administration, and funding acquisition.
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Kong, J., Sabatini, M., Monaco, L. et al. Characterization of a nanocrystalline NiCo electroformed sheet metal. J Mater Sci 56, 1749–1767 (2021). https://doi.org/10.1007/s10853-020-05325-8
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DOI: https://doi.org/10.1007/s10853-020-05325-8