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Revisiting thermodynamics and kinetic diffusivities of uranium-niobium with Bayesian uncertainty analysis
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2016 (English)In: CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, ISSN 0364-5916, Vol. 55, p. 219-230Article in journal (Refereed) Published
Abstract [en]

In this work, thermodynamic and kinetic diffusivities of uranium-niobium (U-Nb) are re-assessed by means of the CALPHAD (CALculation of PHAse Diagram) methodology. In order to improve the consistency and reliability of the assessments, first-principles calculations are coupled with CALPHAD. In particular, heats of formation of gamma-U-Nb are estimated and verified using various density-functional theory (DFT) approaches. These thermochemistry data are then used as constraints to guide the thermodynamic optimization process in such a way that the mutual-consistency between first-principles calculations and CALPHAD assessment is satisfactory. In addition, long-term aging experiments are conducted in order to generate new phase equilibria data at the gamma(2)/alpha + gamma(2) boundary. These data are meant to verify the thermodynamic model. Assessment results are generally in good agreement with experiments and previous calculations, without showing the artifacts that were observed in previous modeling. The mutual-consistent thermodynamic description is then used to evaluate atomic mobility and diffusivity of gamma-U-Nb. Finally, Bayesian analysis is conducted to evaluate the uncertainty of the thermodynamic model and its impact on the system's phase stability.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 55, p. 219-230
Keywords [en]
DFT, CALPHAD, Bayesian, Uncertainty analysis, Metallic fuels, U-Nb, Thermodynamics, Kinetic diffusivity
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Identifiers
URN: urn:nbn:se:kth:diva-200221DOI: 10.1016/j.calphad.2016.09.006ISI: 000390726200012Scopus ID: 2-s2.0-84994495704OAI: oai:DiVA.org:kth-200221DiVA, id: diva2:1073704
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QC 20170213

Available from: 2017-02-13 Created: 2017-02-13 Last updated: 2017-02-16Bibliographically approved

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Vitos, Levente

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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