Journal article
Determination of minimal energy facet structures in Sigma 3 and Sigma 9 grain boundaries: Experiment and simulation
Materialia, v 5
01 Mar 2019
Abstract
Grain boundary engineering (GBE) in FCC alloys relies on the presence of low-energy, coherent Sigma 3 boundaries to improve material performance. To make microstructures with a profuse network of Sigma 3 boundaries, a repetitive cycle of low-level deformation and followed by annealing is commonly employed. In this work, we use a combination of in situ SEM, in situ TEM, and a relaxation theory for grain boundaries to investigate the structural states of grain boundaries in Cu after a cycle or many cycles of deformation and annealing steps. It is revealed that during annealing the orientation relationships and boundary morphology of deformed Sigma 3 and higher order variants, Sigma 9 boundaries, change appreciably, from being curved to distinctly, crystallographically faceted. The theoretical analysis identifies the faceting process and the crystallography of the facets as corresponding to the optimal, low-energy structures for the observed orientation relationships. It is, therefore, shown that post-deformation heat treatments used in GBE are recovering the highly deviated and deformed Sigma 3s boundaries to a low-energy state.
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Details
- Title
- Determination of minimal energy facet structures in Sigma 3 and Sigma 9 grain boundaries: Experiment and simulation
- Creators
- A. C. Leff - Drexel UniversityB. Runnels - University of Colorado Colorado SpringsA. Nye - Drexel UniversityI. J. Beyerlein - University of California, Santa BarbaraM. L. Taheri - Drexel University
- Publication Details
- Materialia, v 5
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- N00014-17-1-2810 / Office of Naval Research DE-SC0008274 / United States Department of Energy, Office of Science, Office of Basic Energy Sciences, under the Early Career program; United States Department of Energy (DOE) 1140807 / National Science Foundation's Early Career Program; National Science Foundation (NSF) UCCS Committee for Research and Creative Works (CRCW) program TG-PHY130007; ACI-1548562 / Extreme Science and Engineering Discovery Environment (XSEDE) - National Science Foundation
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000536259200017
- Scopus ID
- 2-s2.0-85061049522
- Other Identifier
- 991019335239604721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary