|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Microstructural, Mechanical and Chemical Behavior of Solid Nuclear Fuel and Fuel-cladding Interface
||Molecular Dynamics Based Microstructural Evaluation of the Surviving Defects in α-U Induced by a Single Displacement Cascade
||Khadija Mahbuba, Benjamin Beeler, Andrea Jokisaari
|On-Site Speaker (Planned)
A single crystal of anisotropic α-U experiences expansion in the  direction and contraction in the  direction under irradiation, which is in contradiction with the directionally anisotropic thermal expansion. Though the temperature-dependent irradiation growth of α-U was first observed in the early sixties, the mechanism is not still well understood. It is believed that the increased temperature from the displacement cascade leads to anisotropic expansion, which subsequently results in preferential nucleation of point defects in an orientation which leads to the observed irradiation growth response. To validate this hypothesis, an atomistic study of displacement cascades of α-U is conducted. Primary knock-on atoms (PKAs) with both variable kinetic energy (varying from 1keV to 50keV) and incident direction are deployed to perform displacement cascade simulations. The population and structure of the surviving defects are evaluated, and the temperature dependence of the induced irradiation growth is analyzed.
||Nuclear Materials, Computational Materials Science & Engineering, Other