Abstract
The collapse of stacking-fault tetrahedra (SFT) by gliding dislocations was observed in in situ straining experiments in a transmission electron microscope (TEM). A stacking-fault tetrahedron was collapsed by intersection with a gliding perfect dislocation: only the base portion divided by the gliding plane of the dislocation annihilated, while the apex portion remained intact. As a result of analysis on evolution of atom configuration induced by intersection with perfect dislocation in SFT, it was found that an unusual atom configuration inevitably appeared in one of the ledges formed on stacking-fault planes, which is traditionally called I-ledge: the atoms on adjacent (1 1 1) planes were overlapping each other. The overlapping configuration provides a strong repulsive force, being a conceivable driving force to induce a chain reaction of atom displacements that collapses the SFT base portion.
| Original language | English |
|---|---|
| Pages (from-to) | 366-369 |
| Number of pages | 4 |
| Journal | Materials Science and Engineering: A |
| Volume | 400-401 |
| Issue number | 1-2 SUPPL. |
| DOIs | |
| State | Published - Jul 25 2005 |
Funding
This research was sponsored by Office of Fusion Energy Sciences, US Department of Energy, under contract DE-ACO5-00OR22725 with UT-Battelle, LLC. We are grateful to Kathy Yarborough for specimen preparation, and Cecil Carmichael for furnace operation for heat treatments. Also, we thank Drs. Stas Golubov, Nao Hashimoto, Thak Sang Byun in ORNL and Dr. Kazuto Arakawa in Osaka University for valuable comments.
| Funders | Funder number |
|---|---|
| US Department of Energy | DE-ACO5-00OR22725 |
| Fusion Energy Sciences |