The collapse of stacking fault tetrahedra by interactions with gliding dislocations.

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Materials Science and Engineering A

DOI:https://doi.org/10.1016/j.msea.2005.01.063· OSTI ID:1003359

Matsukawa, Yoshitaka ^[1]; Osetskiy, Yury N ^[1]; Stocks, George Malcolm ^[1]; Zinkle, Steven J ^[1]

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1. ORNL

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 (111) 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003359
• Journal Information: Materials Science and Engineering A, Vol. 400-401; ISSN 0921-5093
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DISLOCATIONS
STACKING FAULTS
MASS TRANSFER
INTERACTIONS
ATOMIC DISPLACEMENTS