| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments III
|
| Presentation Title |
Effects of Microstructure on Hydrogen Retention in Metal Hydride Moderators |
| Author(s) |
Jianqi Xi, Nicholas Dailey |
| On-Site Speaker (Planned) |
Jianqi Xi |
| Abstract Scope |
Metal hydride moderators are expected to display compactness and excellent neutron moderation properties in microreactors due to their high hydrogen density. These moderators are currently supported through the DOE-Microreactor Program. An important concern for metal hydride moderator usage is the tendency of hydrogen release at high temperatures, which causes loss of moderation power and disrupts normal reactor operations. In this talk, I will discuss our recent studies addressing the knowledge gap regarding the influence of microstructure on hydrogen retention in metal hydride moderators, e.g. δ-ZrH2-x. We have developed a machine learning interatomic potential (MLIP) for molecular dynamics simulations to study the hydrogen behavior within the microstructures of hydrides. Specifically, we have calculated and compared the trapping energy and hydrogen diffusivity within these microstructures to those in the bulk materials. Our study considered both the intrinsic microstructures (e.g., grain boundaries and stacking faults) and extrinsic microstructures (e.g., secondary phase precipitates). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, |