| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Phase Stability of Metal Hydrides under Combined Radiation and Thermal Environments |
| Author(s) |
Caitlin A. Kohnert, Matheus Tunes, Yongqiang Wang, Matthew Chancey, Tyler Smith, Aditya Shivprasad, Thomas Nizolek, Erik Luther, Tarik Saleh |
| On-Site Speaker (Planned) |
Caitlin A. Kohnert |
| Abstract Scope |
Metal hydrides, especially zirconium hydride (ZrHx) and yttrium hydride (YHx), are being considered for neutron moderators in microreactors and space reactors. These materials contain a high density of hydrogen at room temperature but begin to release hydrogen at elevated temperatures depending on the partial hydrogen pressure. Hydrogen release causes ZrHx and YHx to undergo a phase transformation from the hydride phase (fcc or tetragonal in ZrHx, and fcc in YHx) back to the metal phase (hcp in both Zr and Y), resulting in hydrogen density changes and moderation changes. Pressure-temperature-composition curves accurately describe the equilibrium hydrogen release thermodynamics in both materials, but the effects of non-equilibrium irradiation conditions on hydrogen release are not understood in these hydrides. This talk will outline our work using ion irradiation to investigate hydride phase stability and hydrogen retention in ZrHx and YHx during irradiation up to 2 dpa at various temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, |