Journal
SCRIPTA MATERIALIA
Volume 163, Issue -, Pages 157-162Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.01.011
Keywords
Alumina (alpha-Al2O3); Plastic deformation; Dislocation structure; Nanoindentation; Scanning/transmission electron microscopy (STEM)
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Funding
- Japan Society for the Promotion of Science (JSPS) [JP17H06094]
- Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science, and Technology in Japan (MEXT)
- Nanotechnology Platform of MEXT [12024046]
- JSPS KAKENHI [JP18K13981, 18K13982]
- China Scholarship Council (CSC)
- Grants-in-Aid for Scientific Research [18K13982] Funding Source: KAKEN
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The dislocation associated with the (0001)1/3<11<(2)over bar>0> basal slip in alumina plays an important role on its plastic deformation at elevated temperatures. A 60 degrees mixed basal dislocation was preferentially introduced by in situ transmission electron microscopy (TEM) nanoindentation, and characterized by atomic-resolution scanning TEM (STEM). It was revealed that the 60 degrees mixed basal dislocation dissociates into two partial dislocations via self-climb with a stacking fault on the {1 (1) over bar 00} plane. The dissociation mechanisms of the basal dislocation have been discussed in terms of its core structure and atomic diffusion process. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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