Abstract
The present study explores the behavior of dislocations in uranium dioxide (UO2) under mechanical loading at high-temperature. Transmission electron microscopy characterization was carried out on polycrystalline UO2 pellets after uniaxial compression tests performed at constant strain rate and 1550 °C. The detailed characterization of dislocation motion provides insights on the deformation processes operating at the nanoscale that are critical to better understand the viscoplastic response of the UO2 nuclear fuel during off-normal power transient. Results emphasize the complexity of dislocation motion at high temperature since it involves glide and a mixed mechanism involving climb, called mixed climb, which was not evidenced earlier in this material.
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