Observations of grain boundary structure in submicrometer-grained Cu and Ni using high-resolution electron microscopy
Abstract
Submicrometer-grained (SMG) structures were produced in Cu and Ni using an intense plastic straining technique, and the grain boundaries and their vicinities were observed by high-resolution electron microscopy. The grain boundaries exhibited zigzag configurations with irregular arrangements of facets and steps, and thus they were found to be in a high-energy nonequilibrium state. A similar conclusion was reached earlier for SMG Al-Mg solid solution alloys which have much lower melting points than Cu and Ni, suggesting that nonequilibrium grain boundaries are a typical feature of metals processed by intense plastic straining.
- Publication:
-
Journal of Materials Research
- Pub Date:
- February 1998
- DOI:
- 10.1557/JMR.1998.0057
- Bibcode:
- 1998JMatR..13..446H