Grain boundary kinetics: 2, In-situ observations of the role of grain boundary dislocations in high-angle boundary migration
The capillarity-induced motion of near-..sigma..5 grain boundaries in Au was directly observed and video-recorded by means of hot-stage in-situ transmission electron microscopy. The observed boundary motion differed from the boundary ''displacement'' caused by the stress-induced passage of secondary grain boundary dislocation (SGBD)-steps along the boundary which was studied in Part I of this work in the following respects. It occurred in a jerky fashion, no translation of one abutting crystal with respect to the other was observed, and quantitative evidence proved that SGBDs were not involved. These results ruled out the SGBD-Step Model for the observed motion which was identified as common long-range boundary migration. In-situ observations of the migration of more general high-angle boundaries in polycrystalline Al films revealed similar jerky motion and an apparent lack of any significant contribution to migration by observed SGBDs. 26 refs., 7 figs.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Materials Science and Engineering
- DOE Contract Number:
- FG02-87ER45310
- OSTI ID:
- 6486281
- Report Number(s):
- DOE/ER/45310-16; ON: DE89006791
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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