Fuel Element Design and Modelling

Frost, B.R.T.

doi:10.1016/b978-0-08-020412-3.50009-9

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Cast U metals often have enough impurities to have a significant impact on material properties. The most prevalent impurity is C, and commonly forms hard carbide precipitates [21,22]. These precipitates form during the melting and casting of U, as it must be raised to high temperatures (~1750 K) at which U is highly reactive [23,24].…”

Section: Introductionmentioning

confidence: 99%

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

Bair¹,

Abrecht²,

Reilly³

et al. 2019

J. Phys.: Condens. Matter

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A Phase Field model is developed combining the Orientation Field approach to modeling solidification with the Kim, Kim, Suzuki method of modeling binary alloys. These combined methods produce a model capable of simulating randomly oriented second phase dendrites with discrete control of the solid-liquid interface energy and thickness. The example system of carbon in a liquid uranium (U) melt is used as a test for the model. The formation of uranium carbide within a liquid U melt is simulated for isothermal conditions and compares well with experiments.

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Section: Introductionmentioning

confidence: 99%

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

Bair¹,

Abrecht²,

Reilly³

et al. 2019

J. Phys.: Condens. Matter

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show abstract

“…with 50 ppm or less for other impurity elements (Gittus 1976, Frost 1982. Many of these contaminants are a result of the melting and casting of uranium metal (Jessen 1982).…”

Section: Introductionmentioning

confidence: 99%

Carbon diffusion in molten uranium: anab initiomolecular dynamics study

Garrett

Abrecht

Henson

et al. 2018

Modelling Simul. Mater. Sci. Eng.

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In this work we used ab initio molecular dynamics within the framework of density functional theory and the projector-augmented wave method to study carbon diffusion in liquid uranium at temperatures above 1600 K. The electronic interactions of carbon and uranium were described using the local density approximation (LDA). The self-diffusion of uranium based on this approach is compared with literature computational and experimental results for liquid uranium. The temperature dependence of carbon and uranium diffusion in the melt was evaluated by fitting the resulting diffusion coefficients to an Arrhenius relationship. We found that the LDA calculated activation energy for carbon was nearly twice that of uranium: 0.55 ± 0.03 eV for carbon compared to 0.32 ± 0.04 eV for uranium. Structural analysis of the liquid uranium–carbon system is also discussed.

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Fuel Element Design and Modelling

Cited by 2 publications

References 6 publications

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

Phase field model of uranium carbide solidification through a combined KKS and orientation field approach

Carbon diffusion in molten uranium: anab initiomolecular dynamics study

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