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Repeated stress relaxation tests and strain rate jump tests have been carried out over a range of deformation temperatures (77–373K) on electrodeposited nanocrystalline Ni with an average grain size of ∼30nm. The strain rate sensitivity, the apparent and physical activation volume, and the activation energy have been determined. The magnitude observed for these characteristic deformation parameters,...
The strength of electrodeposited nanocrystalline Ni increased rather than decreased after annealing for 1 h at temperatures below 150°C, with little change in the grain sizes or detectable impurity segregation. Annealing at 200°C can be utilized to tailor the grain size distribution for improved ductility in combination with good strength. Further annealing at above 250°C, however, induced a transition...
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