Grain growth and pore coarsening in dense nano-crystalline UO2+x fuel pellets
Abstract
Abstract Dense nano‐sized UO 2+ x pellets are synthesized by spark plasma sintering with controlled stoichiometries (UO 2.03 and UO 2.11 ) and grain sizes (~100 nm), and subsequently isothermally annealed to study their effects on grain growth kinetics and microstructure stability. The grain growth kinetics is determined and analyzed focusing on the interaction between grain boundary migration, pore growth, and coalescence. Grains grow much bigger in nano‐sized UO 2.11 than UO 2.03 upon thermal annealing, consistent with the fact that hyper‐stoichiometric UO 2+ x is beneficial for sintering due to enhanced U ion diffusion from excessive O ion interstitials. The activation energies of the grain growth for UO 2.03 and UO 2.11 are determined as ~1.0 and ~2.0 eV, respectively. As compared with the micrometer‐sized UO 2 in which volumetric diffusion dominates the grain coarsening with an activation energy of ~3.0 eV, the enhanced grain growth kinetics in nano‐sized UO 2+ x suggests that grain boundary diffusion controls grain growth. The higher activation energy of more hyper‐stoichiometric nano‐sized UO 2.11 may be attributed to the excessive O interstitials pinning grain boundary migration.
- Authors:
-
- Rensselaer Polytechnic Institute, Troy, NY (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States); Xi'an Jiaotong Univ., Shaanxi (China)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Programs (NEUP); National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1373755
- Alternate Identifier(s):
- OSTI ID: 1401771
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Grain growth; Pore; Stoichiometry; UO2
Citation Formats
Yao, Tiankai, Mo, Kun, Yun, Di, Nanda, Sonal, Yacout, Abedellatif M., and Lian, Jie. Grain growth and pore coarsening in dense nano-crystalline UO2+x fuel pellets. United States: N. p., 2017.
Web. doi:10.1111/jace.14780.
Yao, Tiankai, Mo, Kun, Yun, Di, Nanda, Sonal, Yacout, Abedellatif M., & Lian, Jie. Grain growth and pore coarsening in dense nano-crystalline UO2+x fuel pellets. United States. https://doi.org/10.1111/jace.14780
Yao, Tiankai, Mo, Kun, Yun, Di, Nanda, Sonal, Yacout, Abedellatif M., and Lian, Jie. Sat .
"Grain growth and pore coarsening in dense nano-crystalline UO2+x fuel pellets". United States. https://doi.org/10.1111/jace.14780. https://www.osti.gov/servlets/purl/1373755.
@article{osti_1373755,
title = {Grain growth and pore coarsening in dense nano-crystalline UO2+x fuel pellets},
author = {Yao, Tiankai and Mo, Kun and Yun, Di and Nanda, Sonal and Yacout, Abedellatif M. and Lian, Jie},
abstractNote = {Abstract Dense nano‐sized UO 2+ x pellets are synthesized by spark plasma sintering with controlled stoichiometries (UO 2.03 and UO 2.11 ) and grain sizes (~100 nm), and subsequently isothermally annealed to study their effects on grain growth kinetics and microstructure stability. The grain growth kinetics is determined and analyzed focusing on the interaction between grain boundary migration, pore growth, and coalescence. Grains grow much bigger in nano‐sized UO 2.11 than UO 2.03 upon thermal annealing, consistent with the fact that hyper‐stoichiometric UO 2+ x is beneficial for sintering due to enhanced U ion diffusion from excessive O ion interstitials. The activation energies of the grain growth for UO 2.03 and UO 2.11 are determined as ~1.0 and ~2.0 eV, respectively. As compared with the micrometer‐sized UO 2 in which volumetric diffusion dominates the grain coarsening with an activation energy of ~3.0 eV, the enhanced grain growth kinetics in nano‐sized UO 2+ x suggests that grain boundary diffusion controls grain growth. The higher activation energy of more hyper‐stoichiometric nano‐sized UO 2.11 may be attributed to the excessive O interstitials pinning grain boundary migration.},
doi = {10.1111/jace.14780},
journal = {Journal of the American Ceramic Society},
number = 6,
volume = 100,
place = {United States},
year = {Sat Mar 25 00:00:00 EDT 2017},
month = {Sat Mar 25 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Kinetic study on the grain growth of PuO 2 nanocrystals
journal, January 2019
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Consolidation of commercial-size UO2 fuel pellets using spark plasma sintering and microstructure/microchemical analysis
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