Pronounced grain boundary network evolution in nanocrystalline Cu subjected to large cyclic strains
Abstract
The grain boundary network of nanocrystalline Cu foils was modified by the application of cyclic loadings and elevated temperatures. Broadly, the changes to the boundary network were directly correlated with the applied temperature and accumulated strain, including a 300% increase in the twin length fraction. By independently varying each treatment variable, a matrix of grain boundary statistics was built to check the plausibility of hypothesized mechanisms against their expected temperature and stress/strain dependences. These comparisons allow the field of candidate mechanisms to be significantly narrowed. Most importantly, the effects of temperature and strain on twin length fraction were found to be strongly synergistic, with the combined effect being ~150% that of the summed individual contributions. Looking beyond scalar metrics, an analysis of the grain boundary network showed that twin related domain formation favored larger sizes and repeated twin variant selection over the creation of many small domains with diverse variants.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Irvine, CA (United States)
- École Polytechnique Fédérale de Lausanne (Switzerland)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Irvine, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1633519
- Report Number(s):
- LLNL-JRNL-752223
Journal ID: ISSN 0884-2914; 938313
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Research
- Additional Journal Information:
- Journal Volume: 34; Journal Issue: 1; Journal ID: ISSN 0884-2914
- Publisher:
- Materials Research Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Nanostructure; grain boundaries; fatigue
Citation Formats
Bober, David B., LaGrange, Thomas, Kumar, Mukul, and Rupert, Timothy J. Pronounced grain boundary network evolution in nanocrystalline Cu subjected to large cyclic strains. United States: N. p., 2018.
Web. doi:10.1557/jmr.2018.334.
Bober, David B., LaGrange, Thomas, Kumar, Mukul, & Rupert, Timothy J. Pronounced grain boundary network evolution in nanocrystalline Cu subjected to large cyclic strains. United States. https://doi.org/10.1557/jmr.2018.334
Bober, David B., LaGrange, Thomas, Kumar, Mukul, and Rupert, Timothy J. Tue .
"Pronounced grain boundary network evolution in nanocrystalline Cu subjected to large cyclic strains". United States. https://doi.org/10.1557/jmr.2018.334. https://www.osti.gov/servlets/purl/1633519.
@article{osti_1633519,
title = {Pronounced grain boundary network evolution in nanocrystalline Cu subjected to large cyclic strains},
author = {Bober, David B. and LaGrange, Thomas and Kumar, Mukul and Rupert, Timothy J.},
abstractNote = {The grain boundary network of nanocrystalline Cu foils was modified by the application of cyclic loadings and elevated temperatures. Broadly, the changes to the boundary network were directly correlated with the applied temperature and accumulated strain, including a 300% increase in the twin length fraction. By independently varying each treatment variable, a matrix of grain boundary statistics was built to check the plausibility of hypothesized mechanisms against their expected temperature and stress/strain dependences. These comparisons allow the field of candidate mechanisms to be significantly narrowed. Most importantly, the effects of temperature and strain on twin length fraction were found to be strongly synergistic, with the combined effect being ~150% that of the summed individual contributions. Looking beyond scalar metrics, an analysis of the grain boundary network showed that twin related domain formation favored larger sizes and repeated twin variant selection over the creation of many small domains with diverse variants.},
doi = {10.1557/jmr.2018.334},
journal = {Journal of Materials Research},
number = 1,
volume = 34,
place = {United States},
year = {Tue Nov 13 00:00:00 EST 2018},
month = {Tue Nov 13 00:00:00 EST 2018}
}
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