Abstract
A study was carried out on the deformation of nanocrystalline cobalt. For cold-rolled nanocrystalline cobalt, the X-ray diffraction peaks narrowed instead of broadened on deformation. The results of transmission electron microscopy showed that grain size (17.8 nm on average) was not increased. The results can be explained in terms of the production and activity of vacancies and vacancy clusters.
Acknowledgement
This work was supported by the National Nature Science Fund (No. 50471086; No. 50461001).