Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?
Abstract
The role of grain boundaries in limiting irradiation damage in nanocrystalline materials is often correlated with the grain boundary sink efficiency. Here, we demonstrate on a tungsten material system (which has very distinct vacancy and interstitial mobilities) that sink efficiency does not unequivocally describe how grain boundaries impact irradiation damage. Rather, it reflects a particular defect diffusion equation that can change if any of the bulk conditions change. Even when denuded zone formation does not occur and grain boundaries have zero sink efficiencies, grain boundaries still impact the performance of nanocrystalline materials under irradiation by acting as a saturable defect storage site. However, denuded zone formation can occur under a necessary requirement of extra defect recombination at the grain boundaries (which, for example, is not possible when vacancy migration does not occur). These insights provide answers to several outstanding questions regarding the sink efficiency of a grain boundary and assist in parametrizing the role of grain boundaries in limiting irradiation damage in nanocrystalline materials.
- Authors:
-
[1];
[1];
[1];
[1];
[1]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Middle East Technical Univ., Ankara (Turkey). Metallurgical and Materials Engineering
- Idaho National Lab. (INL), Idaho Falls, ID (United States). Fusion Safety Program
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1511606
- Alternate Identifier(s):
- OSTI ID: 1483027
- Report Number(s):
- LA-UR-18-26334
Journal ID: ISSN 2475-9953; PRMHAR
- Grant/Contract Number:
- 89233218CNA000001; SC0008875
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 11; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
El Atwani, Osman, Martinez Saez, Enrique, Esquivel, Erika V., Efe, Mert, Taylor, Chase, Wang, Yongqiang, Uberuaga, Blas P., and Maloy, Stuart Andrew. Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?. United States: N. p., 2018.
Web. doi:10.1103/PhysRevMaterials.2.113604.
El Atwani, Osman, Martinez Saez, Enrique, Esquivel, Erika V., Efe, Mert, Taylor, Chase, Wang, Yongqiang, Uberuaga, Blas P., & Maloy, Stuart Andrew. Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?. United States. https://doi.org/10.1103/PhysRevMaterials.2.113604
El Atwani, Osman, Martinez Saez, Enrique, Esquivel, Erika V., Efe, Mert, Taylor, Chase, Wang, Yongqiang, Uberuaga, Blas P., and Maloy, Stuart Andrew. Wed .
"Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?". United States. https://doi.org/10.1103/PhysRevMaterials.2.113604. https://www.osti.gov/servlets/purl/1511606.
@article{osti_1511606,
title = {Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage?},
author = {El Atwani, Osman and Martinez Saez, Enrique and Esquivel, Erika V. and Efe, Mert and Taylor, Chase and Wang, Yongqiang and Uberuaga, Blas P. and Maloy, Stuart Andrew},
abstractNote = {The role of grain boundaries in limiting irradiation damage in nanocrystalline materials is often correlated with the grain boundary sink efficiency. Here, we demonstrate on a tungsten material system (which has very distinct vacancy and interstitial mobilities) that sink efficiency does not unequivocally describe how grain boundaries impact irradiation damage. Rather, it reflects a particular defect diffusion equation that can change if any of the bulk conditions change. Even when denuded zone formation does not occur and grain boundaries have zero sink efficiencies, grain boundaries still impact the performance of nanocrystalline materials under irradiation by acting as a saturable defect storage site. However, denuded zone formation can occur under a necessary requirement of extra defect recombination at the grain boundaries (which, for example, is not possible when vacancy migration does not occur). These insights provide answers to several outstanding questions regarding the sink efficiency of a grain boundary and assist in parametrizing the role of grain boundaries in limiting irradiation damage in nanocrystalline materials.},
doi = {10.1103/PhysRevMaterials.2.113604},
journal = {Physical Review Materials},
number = 11,
volume = 2,
place = {United States},
year = {Wed Nov 21 00:00:00 EST 2018},
month = {Wed Nov 21 00:00:00 EST 2018}
}
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