TEM-based phase characterization of $\mathrm{U–19Pu–10Zr}$ irradiated in ATR

Rahn, Thaddeus; Miller, Brandon D.; Capriotti, Luca; Aitkaliyeva, Assel

doi:10.1557/s43577-022-00422-2

TEM-based phase characterization of $$\mathrm{U–19Pu–10Zr}$$ irradiated in ATR

Journal Article · Wed Nov 02 00:00:00 EDT 2022 · MRS Bulletin

DOI:https://doi.org/10.1557/s43577-022-00422-2· OSTI ID:1968156

Rahn, Thaddeus ^[1]; ^[2]; ^[2]; ^[1]

University of Florida, Gainesville, FL (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

We report the results of the microstructural examination of the irradiated U–19Pu–10Zr fuel. New insights gained using selective area electron diffraction analysis in a transmission electron microscope provide crystallographic information on the phases previously identified based primarily on the chemical compositions. After irradiation, the microstructure of the fuel separates into γ-(U, Pu, Zr) in the central region with a secondary nanocrystalline UO₂ phase, γ-(U, Pu, Zr) with a secondary ZrO₂ phase in the intermediate, and ζ-(U, Pu) in the outer regions. While the surface microstructural features and porosity indicate separation into three concentric zones consistent with the existing constituent redistribution model, crystallographically the fuel consists of two zones: inner (with γ-(U, Pu, Zr) as a matrix phase) and outer (with ζ-(U, Pu) as a matrix phase). Our results highlight the importance of crystal structure in phase identification and can be used to supplement the existing constituent redistribution model.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1968156

Report Number(s):: INL/JOU-23-71117-Revision-0

Journal Information:: MRS Bulletin, Journal Name: MRS Bulletin Journal Issue: July 2023 Vol. 48; ISSN 0883-7694

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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