skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Three-dimensional phase-field simulations of intragranular gas bubble evolution in irradiated U-Mo fuel

Abstract

The evolution of fission gas bubbles in irradiated materials plays a critical role in the microstructural processes that leads to dimensional changes of U-Mo alloy fuels, e.g., fuel swelling. Although the intergranular bubbles-induced fuel swelling has been long-discussed for U-Mo fuel, there are very few computational studies of the formation of intragranular gas bubbles and its impact on fuel swelling. To this end, we develop a three-dimensional phase-field model to investigate the evolution of intragranular gas bubbles in U-Mo fuel. Fission induced defect formation and annihilation processes, such as vacancy-interstitial recombination, fission gas atom resolution, and interactions with dislocations and grain boundaries are incorporated in the model. Simulations show that the intragranular gas bubbles can be stabilized to certain sizes due to the balance between the generation and annihilation of defects. The intragranular gas bubbles induced fuel swelling is predicted to be comparable to experimental measurements. The effects of the irradiation and fuel fabrication conditions (i.e., fission rate, fuel grain size, and mechanical work induced deformation) on the bubble evolution and the resultant swelling are investigated. The current simulations provide a better understanding of intragranular gas bubble-induced swelling and a solid foundation for the future study of the nucleation andmore » growth of intergranular gas bubbles and recrystallization in U-Mo fuel. Published by Elsevier B.V.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1459945
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Computational Materials Science
Additional Journal Information:
Journal Volume: 145; Journal Issue: C; Journal ID: ISSN 0927-0256
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Phase-field; fuel swelling; intragranular gas bubbles

Citation Formats

Liang, Linyun, Mei, Zhi-Gang, Soo Kim, Yeon, Anitescu, Mihai, and Yacout, Abdellatif M. Three-dimensional phase-field simulations of intragranular gas bubble evolution in irradiated U-Mo fuel. United States: N. p., 2018. Web. doi:10.1016/j.commatsci.2017.12.061.
Liang, Linyun, Mei, Zhi-Gang, Soo Kim, Yeon, Anitescu, Mihai, & Yacout, Abdellatif M. Three-dimensional phase-field simulations of intragranular gas bubble evolution in irradiated U-Mo fuel. United States. doi:10.1016/j.commatsci.2017.12.061.
Liang, Linyun, Mei, Zhi-Gang, Soo Kim, Yeon, Anitescu, Mihai, and Yacout, Abdellatif M. Sun . "Three-dimensional phase-field simulations of intragranular gas bubble evolution in irradiated U-Mo fuel". United States. doi:10.1016/j.commatsci.2017.12.061.
@article{osti_1459945,
title = {Three-dimensional phase-field simulations of intragranular gas bubble evolution in irradiated U-Mo fuel},
author = {Liang, Linyun and Mei, Zhi-Gang and Soo Kim, Yeon and Anitescu, Mihai and Yacout, Abdellatif M.},
abstractNote = {The evolution of fission gas bubbles in irradiated materials plays a critical role in the microstructural processes that leads to dimensional changes of U-Mo alloy fuels, e.g., fuel swelling. Although the intergranular bubbles-induced fuel swelling has been long-discussed for U-Mo fuel, there are very few computational studies of the formation of intragranular gas bubbles and its impact on fuel swelling. To this end, we develop a three-dimensional phase-field model to investigate the evolution of intragranular gas bubbles in U-Mo fuel. Fission induced defect formation and annihilation processes, such as vacancy-interstitial recombination, fission gas atom resolution, and interactions with dislocations and grain boundaries are incorporated in the model. Simulations show that the intragranular gas bubbles can be stabilized to certain sizes due to the balance between the generation and annihilation of defects. The intragranular gas bubbles induced fuel swelling is predicted to be comparable to experimental measurements. The effects of the irradiation and fuel fabrication conditions (i.e., fission rate, fuel grain size, and mechanical work induced deformation) on the bubble evolution and the resultant swelling are investigated. The current simulations provide a better understanding of intragranular gas bubble-induced swelling and a solid foundation for the future study of the nucleation and growth of intergranular gas bubbles and recrystallization in U-Mo fuel. Published by Elsevier B.V.},
doi = {10.1016/j.commatsci.2017.12.061},
journal = {Computational Materials Science},
issn = {0927-0256},
number = C,
volume = 145,
place = {United States},
year = {2018},
month = {4}
}