Abstract
The growth of subgrains is studied in strongly deformed 99·80% pure polycrystalline nickel. The observed zone of the specimen was heated by means of an illuminating electron-beam. It has been verified that the subgrains grow by the migration of their boundaries in steps of the order of 1 μ. In metals, the subgrains, the “nuclei” of which are already observed in the deformed material, grow first. Before a perfect subgrain is formed, its “nucleus” with diffusion subboundaries can always be found. The formation of subgrains by the coalescence of individual slightly misoriented zones is observed in some cases. The growth of subgrains in further stages however, does not, proceed in the above manner.
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