Lattice Strain Mapping of Cracks and Indentations in UO2 using Synchrotron Microdiffraction

Mo, Kun; Miao, Yinbin; Xu, Ruqing; Yao, Tiankai; Lian, Jie; Jamison, Laura M.; Yacout, Abdellatif M.

doi:10.1016/j.jnucmat.2019.151943

Title: Lattice Strain Mapping of Cracks and Indentations in UO₂ using Synchrotron Microdiffraction

Journal Article · 03 December 2019 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2019.151943 · OSTI ID:1606403

Mo, Kun ^[1]; Miao, Yinbin ^[1]; Xu, Ruqing ^[1]; Yao, Tiankai ^[2]; Lian, Jie ^[3]; Jamison, Laura M. ^[1]; Yacout, Abdellatif M. ^[1]

Argonne National Lab. (ANL), Lemont, IL (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)

Fractures and cracks commonly found in UO₂ fuel in nuclear reactors have been studied for decades. In this study, an advanced synchrotron micro X-ray diffraction (XRD) technique was used to study lattice strain development in cracking and indentation regions of micro-indented UO₂ materials. A stoichiometric UO₂ sample prepared by spark plasma sintering (SPS) was indented with a microscale Vickers indenter. The cracks and other defects on the sample surface observed in scanning electron microscope were correlated to the micro-diffraction measurements by Laue diffraction signal intensities, so that the lattice strains developed in those microstructures could be precisely mapped. We report the highest and lowest strained areas were found near the indentation tip and within the "open" crack, respectively. Induced by the residual stress, the lattice strain near the indentation was found to progressively decrease radially from the indentation boundary.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: AC02-06CH11357; NE0008564

OSTI ID:: 1606403

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 529; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Lattice Strain Mapping of Cracks and Indentations in UO2 using Synchrotron Microdiffraction

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Title: Lattice Strain Mapping of Cracks and Indentations in UO₂ using Synchrotron Microdiffraction