| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Non-ideality of Hydrogen Isotope Permeation in Metals & Alloys |
| Author(s) |
Kacie Annelies Breeding, Steven Zinkle, Weicheng Zhong |
| On-Site Speaker (Planned) |
Kacie Annelies Breeding |
| Abstract Scope |
Tritium extraction from breeder blanket hot working fluids is a key technological feasibility issue for fusion energy. A leading extraction method utilizes vacuum permeators, where tritium selectively permeates through tubing material with high hydrogen isotope permeability. Group V metals & alloys have the highest reported permeability, however experimental results can vary wildly by orders of magnitude (including positive and negative slopes for permeability versus inverse temperature). We have performed experimental permeation tests on V and Nb alloys over a wide range of pressures and temperatures and analyzed the conditions that lead to apparent deviation from Sievert’s law for diatomic gas solubility. In general, key phenomena such as time constants for molecule dissociation and reattachment as well as the time to approach solubility limits need to be considered when setting up test temperatures and pressures. Additional factors include uninvestigated phase transitions, permeate formation, hydrogen trapping & non-ideal gaseous permeate behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Nuclear Materials, Phase Transformations |