Journal
SCRIPTA MATERIALIA
Volume 154, Issue -, Pages 49-53Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.05.023
Keywords
Complexion; Nanocrystalline metal; Grain growth; Grain boundary segregation; Interface structure
Categories
Funding
- U.S. Army Research Office [W911NF-16-1-0369]
- National Science Foundation Center for Chemistry at the Space-Time Limit [CHE-0802913]
- U.S. Department of Energy (DOE) Office of Science [DE-AC52-06NA25396]
- Sandia National Laboratories [DE-NA-0003525]
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Solute segregation is used to limit grain growth in nanocrystalline metals, but this stabilization often breaks down at high temperatures. Amorphous intergranular films can form in certain alloys at sufficiently high temperatures, providing a possible alternative route to lower grain boundary energy and therefore limit grain growth. In this study, nanocrystalline Ni-W that is annealed at temperatures of 1000 degrees C and above, then rapidly quenched, is found to contain amorphous intergranular films. These complexions lead to a new, unexpected region of nano crystalline stability at elevated temperatures. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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