Thermally activated step motion observed by HREM at a (113) symmetric tilt grain boundary in Al.
Journal Article
·
· Philos. Mag. Lett.
Grain-boundary migration is demonstrated to proceed by lateral propagation of a small step in a (113), [110] symmetric Al tilt grain-boundary. In-situ high-resolution (transmission) electron microscopy (HREM) at 523K allowed the study of atomic-scale detail at video rates during the migration process. The grain-boundary translational states on both sides of the step are identical, which leads to a step dislocation. This defect can move laterally by a combination of climb and glide. Dynamic HREM images indicate considerable atomic agitation within the dislocation core. A detailed temporal analysis of the step movements shows small random displacements of the dislocation core.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949690
- Report Number(s):
- ANL/MSD/JA-43329
- Journal Information:
- Philos. Mag. Lett., Journal Name: Philos. Mag. Lett. Journal Issue: 11 ; Nov. 2002 Vol. 82; ISSN 0950-0839; ISSN PMLEEG
- Country of Publication:
- United States
- Language:
- ENGLISH
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