期刊
SCRIPTA MATERIALIA
卷 64, 期 4, 页码 327-330出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2010.10.027
关键词
Severe plastic deformation; Nanocrystalline materials; Dislocation density; High-pressure torsion
类别
资金
- Australian Microscopy & Microanalysis Research Facility node at the University of Sydney
- Australian Research Council [DP0772880]
- Los Alamos National Laboratory
- Office of Naval Research [N00014-04-1-0370, N00014-08-1-0405]
- National Science Foundation of the United States [DMR-0855009]
- US Army Research Office and Army Research Laboratory
- China Scholarship Council
The structural evolution of a nanocrystalline Ni-Fe alloy induced by high-pressure torsion (H PT) was investigated. HPT-induced grain growth occurred via grain rotation and coalescence, forming three-dimensional small-angle sub-grain boundaries. Further deformation eliminates the sub-grain boundaries from which dislocations glide away on different {1 1 1} planes. A significant number of these dislocations corm together to form Lomer-Cottrell locks that effectively increase the dislocation storage capacity of the nanocrystalline material. These observations may help with developing strong and ductile nanocrystalline materials. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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