| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Morphological aspects of Ni-based alloys undergoing molten salt dealloying corrosion: a phase field study |
| Author(s) |
Nathan Bieberdorf, Xueyang Bognarova, Laurent Capolungo, Mark Asta |
| On-Site Speaker (Planned) |
Nathan Bieberdorf |
| Abstract Scope |
The corrosion rate of salt-facing alloys is intimately tied to their evolving microstructure and interface morphology. Under certain conditions, this coupling facilitates rapid "dealloying" attack of the alloy, which results in highly porous, morphologically complex structures that are depleted of the less-noble alloy constituents. In other cases, the corrosion can be relatively planar or confined to occur at grain boundaries. Salt chemistry and alloy microstructure are known to influence corrosion morphology and rate, but the associated mechanisms are poorly understood. In this work, we develop an electrochemical phase field model to simulate molten salt corrosion of Ni-based alloys. The thermodynamic formulation uses experimentally informed redox potentials and mixing activities. We demonstrate that corrosion morphology and rate depend strongly on solute transport processes occurring along the solid-liquid interface and along grain boundaries. Further, we examine how the salt’s corrosion potential (as set by its oxidizing species content) influences corrosion mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Modeling and Simulation, Nuclear Materials |