Using in situ UO<sub>2</sub> bicrystal sintering to understand grain boundary dislocation nucleation kinetics and creep-Reference-Cited by-同舟云学术

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

Published:2024-06-19 Issue:10 Volume:107 Page:6701-6714
ISSN:0002-7820
Container-title:Journal of the American Ceramic Society
language:en
Short-container-title:J Am Ceram Soc.

Author:

Dillon Shen J.¹^ORCID,Finkeldei Sarah C.¹²³,Lang Eric⁴,Hattar Khalid⁵,Nelson Andrew T.⁶

Affiliation:

1. Department of Materials Science and Engineering University of California Irvine Irvine California USA

2. Department of Chemistry University of California Irvine Irvine California USA

3. Department of Chemical and Biomolecular Engineering University of California Irvine Irvine California USA

4. Department of Nuclear Engineering University of New Mexico Albuquerque New Mexico USA

5. Department of Nuclear Engineering University of Tennessee Knoxville Tennessee USA

6. Oak Ridge National Laboratory Oak Ridge Tennessee USA

Abstract

AbstractCapillary 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 . 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.

Publisher

Wiley

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