| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Phase Field Modeling of NiCr Alloys Undergoing Molten Salt Dealloying Corrosion |
| Author(s) |
Nathan Bieberdorf, Xueyang Wu, Laurent Capolungo, Mark Asta |
| On-Site Speaker (Planned) |
Nathan Bieberdorf |
| Abstract Scope |
Metals in contact with molten salts have been shown to corrode via a dealloying process, wherein selective dissolution of the less-noble metal elements leads to the formation of a porous structure that is enriched in the more-noble elements. The metal’s microstructure and the salt’s chemistry are known to influence this process, however a mechanistic understanding of how these factors synergistically control corrosion morphology remains incomplete. In this work, we use an electrochemical phase field model to simulate dealloying corrosion of NiCr metals in contact with molten fluoride salts. The model incorporates metal dissolution into the salt via redox potentials for Ni and Cr, and we illustrate that pore growth strongly depends on solute transport rates within the metal and molten salt, and also along their interface. We further discuss how overall corrosion morphology is influenced by radiation-enhanced transport in the metal and oxidizing species content in the molten salt. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, Computational Materials Science & Engineering |