Abstract
Nanocrystalline nickel film was electrodeposited with supercritical CO2 emulsion. The effects of annealing on nanocrystalline nickel were evaluated with scanning electron microscopy. The deposited films had a grain size of 16nm with 2at.% of interstitial carbon. A slight grain growth to 30nm grain size was observed after low temperature (<200°С) annealing. Higher temperature (>300°С) annealing caused Ni3C precipitation at grain boundaries and prominent grain growth above 300nm grain size. Micro-compression samples of each annealed films and as-deposited film were fabricated to investigate the mechanical properties. Low temperature annealed nickel was fractured by cracking with higher yield strength compared to the as-deposited nickel while high temperature annealed nickel simply had a decrease in strength. The brittle fracture after annealing is suggested to be related to the redistribution of carbon and relaxation of grain boundaries. High yield strength of 1GPa after 400°С annealing is achieved thanks to the fine precipitates of Ni3C.
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