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Title: Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation

Authors:
ORCiD logo; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1396790
Grant/Contract Number:
AC05-76RL01830
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 479; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 15:28:08; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Hu, Shenyang, Burkes, Douglas E., Lavender, Curt A., Senor, David J., Setyawan, Wahyu, and Xu, Zhijie. Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation. Netherlands: N. p., 2016. Web. doi:10.1016/j.jnucmat.2016.07.012.
Hu, Shenyang, Burkes, Douglas E., Lavender, Curt A., Senor, David J., Setyawan, Wahyu, & Xu, Zhijie. Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation. Netherlands. doi:10.1016/j.jnucmat.2016.07.012.
Hu, Shenyang, Burkes, Douglas E., Lavender, Curt A., Senor, David J., Setyawan, Wahyu, and Xu, Zhijie. Sat . "Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation". Netherlands. doi:10.1016/j.jnucmat.2016.07.012.
@article{osti_1396790,
title = {Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation},
author = {Hu, Shenyang and Burkes, Douglas E. and Lavender, Curt A. and Senor, David J. and Setyawan, Wahyu and Xu, Zhijie},
abstractNote = {},
doi = {10.1016/j.jnucmat.2016.07.012},
journal = {Journal of Nuclear Materials},
number = C,
volume = 479,
place = {Netherlands},
year = {Sat Oct 01 00:00:00 EDT 2016},
month = {Sat Oct 01 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jnucmat.2016.07.012

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Nano-gas bubble superlattices are often observed in irradiated UMo nuclear fuels. However, the for- mation mechanism of gas bubble superlattices is not well understood. A number of physical processes may affect the gas bubble nucleation and growth; hence, the morphology of gas bubble microstructures including size and spatial distributions. In this work, a phase-field model integrating a first-passage Monte Carlo method to investigate the formation mechanism of gas bubble superlattices was devel- oped. Six physical processes are taken into account in the model: 1) heterogeneous generation of gas atoms, vacancies, and interstitials informed from atomistic simulations; 2) one-dimensional (1-D) migration of interstitials; 3) irradiation-induced dissolution of gas atoms; 4) recombination between vacancies and interstitials; 5) elastic interaction; and 6) heterogeneous nucleation of gas bubbles. We found that the elastic interaction doesn’t cause the gas bubble alignment, and fast 1-D migration of interstitials alongmore » $$\langle$$110$$\rangle$$ directions in the body-centered cubic U matrix causes the gas bubble alignment along $$\langle$$110$$\rangle$$ directions. It implies that 1-D interstitial migration along [110] direction should be the primary mechanism of a fcc gas bubble superlattice which is observed in bcc UMo alloys. Simulations also show that fission rates, saturated gas concentration, and elastic interaction all affect the morphology of gas bubble microstructures.« less
  • A three dimensional microstructure dependent swelling model is developed for studying the fission gas swelling kinetics in irradiated nuclear fuels. The model is extended from the Booth model [1] in order to investigate the effect of heterogeneous microstructures on gas bubble swelling kinetics. As an application of the model, the effect of grain morphology, fission gas diffusivity, and spatial dependent fission rate on swelling kinetics are simulated in UMo fuels. It is found that the decrease of grain size, the increase of grain aspect ratio for the grain having the same volume, and the increase of fission gas diffusivity (fissionmore » rate) cause the increase of swelling kinetics. Other heterogeneities such as second phases and spatial dependent thermodynamic properties including diffusivity of fission gas, sink and source strength of defects could be naturally integrated into the model to enhance the model capability.« less
  • Recrystallization plays an important role in swelling kinetics of irradiated metallic nuclear fuels. This talk will present a three-dimensional microstructure-dependent swelling model by integrating the evolution of intra-and inter- granular gas bubbles, dislocation loop density, and recrystallization.
  • Experiments showed that recrystallization dramatically speeds up the gas bubble swelling kinetics in metallic UMo fuels. In this work a recrystallization model is developed to study the effect of microstructures and radiation conditions on recrystallization kinetics. The model integrates the rate theory of intra-granular gas bubble and interstitial loop evolution and a phase field model of recrystallization zone evolution. A fast passage method is employed to describe one dimensional diffusion of interstitials which have diffusivity several order magnitude larger than that of the fission gas Xe. With the model, the effect of grain sizes on recrystallization kinetics is simulated.