Temperature-dependent strain rate sensitivity and activation volume of nanocrystalline Ni

Repeated stress relaxation tests and strain rate jump tests have been carried out over a range of deformation temperatures (77–373 K) on electrodeposited nanocrystalline Ni with an average grain size of ∼30 nm. 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, as well as their temperature-dependent...