Phase-field simulations of intragranular fission gas bubble evolution in UO2 under post-irradiation thermal annealing
Fission gas bubbles are one of the evolving microstructures that affect thermal mechanical properties, such as thermal conductivity, gas release, volume swelling, and cracking, in operating nuclear fuels. Therefore, fundamental understanding of gas bubble evolution kinetics is essential to predict t...
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| Veröffentlicht in: | Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 303:62-67 Beam Interactions with Materials and Atoms, 303:62-67, 2013-05, Vol.303, p.62-67 |
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| container_title | Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 303:62-67 |
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| creator | Li, Yulan Hu, Shenyang Montgomery, Robert Gao, Fei Sun, Xin |
| description | Fission gas bubbles are one of the evolving microstructures that affect thermal mechanical properties, such as thermal conductivity, gas release, volume swelling, and cracking, in operating nuclear fuels. Therefore, fundamental understanding of gas bubble evolution kinetics is essential to predict the thermodynamic property and performance changes of fuels. In this work, a generic phase-field model was developed to describe the evolution kinetics of intragranular fission gas bubbles in UO2 fuels under post-irradiation thermal annealing conditions. Free energy functional and model parameters are evaluated from atomistic simulations and experiments. Critical nucleus size of gas bubbles and gas bubble evolution were simulated. A linear relationship between logarithmic bubble number density and logarithmic mean bubble diameter was predicted, which is in good agreement with experimental data. |
| doi_str_mv | 10.1016/j.nimb.2012.11.028 |
| format | Article |
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(PNNL), Richland, WA (United States)</creatorcontrib><description>Fission gas bubbles are one of the evolving microstructures that affect thermal mechanical properties, such as thermal conductivity, gas release, volume swelling, and cracking, in operating nuclear fuels. Therefore, fundamental understanding of gas bubble evolution kinetics is essential to predict the thermodynamic property and performance changes of fuels. In this work, a generic phase-field model was developed to describe the evolution kinetics of intragranular fission gas bubbles in UO2 fuels under post-irradiation thermal annealing conditions. Free energy functional and model parameters are evaluated from atomistic simulations and experiments. Critical nucleus size of gas bubbles and gas bubble evolution were simulated. A linear relationship between logarithmic bubble number density and logarithmic mean bubble diameter was predicted, which is in good agreement with experimental data.</description><identifier>ISSN: 0168-583X</identifier><identifier>EISSN: 1872-9584</identifier><identifier>DOI: 10.1016/j.nimb.2012.11.028</identifier><language>eng</language><publisher>United States: Elsevier B.V</publisher><subject>Annealing ; Bubbles ; Computer simulation ; Density ; Evolution ; Fuels ; Intra-granular gas bubbles evolution ; Intragranular gas bubble evolution ; Mathematical models ; Nuclear fission ; Phase-field approach ; Post-irradiation annealing ; post-irradiation annealing, UO2 ; UO2</subject><ispartof>Nuclear Instruments and Methods in Physics Research. 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(PNNL), Richland, WA (United States)</creatorcontrib><title>Phase-field simulations of intragranular fission gas bubble evolution in UO2 under post-irradiation thermal annealing</title><title>Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 303:62-67</title><description>Fission gas bubbles are one of the evolving microstructures that affect thermal mechanical properties, such as thermal conductivity, gas release, volume swelling, and cracking, in operating nuclear fuels. Therefore, fundamental understanding of gas bubble evolution kinetics is essential to predict the thermodynamic property and performance changes of fuels. In this work, a generic phase-field model was developed to describe the evolution kinetics of intragranular fission gas bubbles in UO2 fuels under post-irradiation thermal annealing conditions. Free energy functional and model parameters are evaluated from atomistic simulations and experiments. Critical nucleus size of gas bubbles and gas bubble evolution were simulated. 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| identifier | ISSN: 0168-583X |
| ispartof | Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 303:62-67, 2013-05, Vol.303, p.62-67 |
| issn | 0168-583X 1872-9584 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Annealing Bubbles Computer simulation Density Evolution Fuels Intra-granular gas bubbles evolution Intragranular gas bubble evolution Mathematical models Nuclear fission Phase-field approach Post-irradiation annealing post-irradiation annealing, UO2 UO2 |
| title | Phase-field simulations of intragranular fission gas bubble evolution in UO2 under post-irradiation thermal annealing |
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