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Using in situ UO2 bicrystal sintering to understand grain boundary dislocation nucleation kinetics and creep.

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Title: Using in situ UO2 bicrystal sintering to understand grain boundary dislocation nucleation kinetics and creep.
Authors: Dillon, Shen J.1 (AUTHOR) sdillon1@uci.edu, Finkeldei, Sarah C.1,2,3 (AUTHOR), Lang, Eric4 (AUTHOR), Hattar, Khalid5 (AUTHOR), Nelson, Andrew T.6 (AUTHOR)
Source: Journal of the American Ceramic Society. Oct2024, Vol. 107 Issue 10, p6701-6714. 14p.
Subjects: Dislocation nucleation, Uranium compounds, Rate of nucleation, Transmission electron microscopy, Uraninite, Crystal grain boundaries
Abstract: Capillary evolution at bicrystal UO2 grain boundaries is characterized using in situ transmission electron microscopy. The discontinuous nature of the densification process, both particle rotation and axial strain, along with the large activation stress for densification support a hypothesis that grain boundary strain in UO2 follows nucleation rate limited kinetics at low to intermediate stresses, that is, less than ≈108Pa$ \approx {10}^8\ {\mathrm{Pa}}$. The temperature dependence of the average activation stress for sintering agrees well with analysis of bulk sintering data and creep data reported within the literature when analyzed in the context of a grain boundary dislocation nucleation rate limited kinetic model. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 178813667
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  Label: Title
  Group: Ti
  Data: Using in situ UO<subscript>2</subscript> bicrystal sintering to understand grain boundary dislocation nucleation kinetics and creep.
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  Data: <searchLink fieldCode="AR" term="%22Dillon%2C+Shen+J%2E%22">Dillon, Shen J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sdillon1@uci.edu</i><br /><searchLink fieldCode="AR" term="%22Finkeldei%2C+Sarah+C%2E%22">Finkeldei, Sarah C.</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lang%2C+Eric%22">Lang, Eric</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hattar%2C+Khalid%22">Hattar, Khalid</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nelson%2C+Andrew+T%2E%22">Nelson, Andrew T.</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Oct2024, Vol. 107 Issue 10, p6701-6714. 14p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Dislocation+nucleation%22">Dislocation nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium+compounds%22">Uranium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Rate+of+nucleation%22">Rate of nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Uraninite%22">Uraninite</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Capillary evolution at bicrystal UO2 grain boundaries is characterized using in situ transmission electron microscopy. The discontinuous nature of the densification process, both particle rotation and axial strain, along with the large activation stress for densification support a hypothesis that grain boundary strain in UO2 follows nucleation rate limited kinetics at low to intermediate stresses, that is, less than ≈108Pa$ \approx {10}^8\ {\mathrm{Pa}}$. The temperature dependence of the average activation stress for sintering agrees well with analysis of bulk sintering data and creep data reported within the literature when analyzed in the context of a grain boundary dislocation nucleation rate limited kinetic model. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1111/jace.19960
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 6701
    Subjects:
      – SubjectFull: Dislocation nucleation
        Type: general
      – SubjectFull: Uranium compounds
        Type: general
      – SubjectFull: Rate of nucleation
        Type: general
      – SubjectFull: Transmission electron microscopy
        Type: general
      – SubjectFull: Uraninite
        Type: general
      – SubjectFull: Crystal grain boundaries
        Type: general
    Titles:
      – TitleFull: Using in situ UO2 bicrystal sintering to understand grain boundary dislocation nucleation kinetics and creep.
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            NameFull: Dillon, Shen J.
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            NameFull: Finkeldei, Sarah C.
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            NameFull: Lang, Eric
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            NameFull: Hattar, Khalid
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            NameFull: Nelson, Andrew T.
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            – D: 01
              M: 10
              Text: Oct2024
              Type: published
              Y: 2024
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