|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors VII
||Characterization of Intragranular Creep Deformation in Uranium Dioxide Using Electron Backscatter Diffraction and Electron Channeling Contrast Imaging
||Benjamin Shaffer, Pedro Peralta
|On-Site Speaker (Planned)
Thermo-mechanical response in uranium dioxide is critical to model and understand Pellet-Cladding Mechanical Interactions (PCMI). Anisotropy in mechanical properties (e.g. elasticity) at elevated temperatures, as well as dislocation-driven plasticity and creep, can have significant effects on the mechanical behavior of fuel pellets during reactor operation, particularly during power transients and accident conditions. This work investigates intragranular creep behavior of depleted Uranium Dioxide (d-UO2) using ex-situ mechanical testing in samples with large grains; instrumented uniaxial compression testing was performed at elevated temperatures under controlled atmospheres to ensure consistent stoichiometries. Creep strain rates under load were recorded to provide intra-granular deformation data and assist in the correlation of local crystallography and mechanical behavior, while characterization using Scanning Electron Microscopy (SEM) and Electron Backscatter Diffraction (EBSD) in conjunction with Electron Channeling Contrast Imaging (ECCI) was performed to characterize changes in the microstructure and directly image and characterize dislocation traces and Burgers vectors, respectively.
||Planned: Supplemental Proceedings volume