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- Title
Direct Observation of a Screw Dislocation Normal to the Beam by Z-Contrast STEM.
- Authors
Li, Fangzhi; Nian, Hongqiang; Du, Kui; Wang, Jiemin; Wang, Jingyang; Zhou, Yanchun; Mitchell, T.
- Abstract
Dislocation core structures in metals and ceramics are long-standing questions in materials research. Detailed knowledge about core structure of screw dislocations remains a major challenge. We have designed and synthesized a novel HfAl4C4 ceramic with a large c axis and vast difference in atomic numbers, in which a c[0001] screw dislocation is directly observed with dislocation line perpendicular to the viewing direction by STEM. This observation has cast a new light on revealing the detailed core structure of screw dislocations.
- Subjects
MATERIALS; BUILDING materials research; DISLOCATIONS in metals; SCANNING transmission electron microscopy; CERAMICS; STRUCTURAL analysis (Engineering)
- Publication
Journal of the American Ceramic Society, 2012, Vol 95, Issue 2, p466
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2011.05016.x