About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Molten Salt Corrosion: Dealloying and the Proposed Role of Grain Boundaries |
| Author(s) |
Suraj Y. Persaud, Weiyue Zhou, Hooman Gholamzadeh, Yang Yang, Mehdi Mosayebi, Travis Casagrande, Kevin Daub, Mark Daymond, Mike Short |
| On-Site Speaker (Planned) |
Suraj Y. Persaud |
| Abstract Scope |
Corrosion of Ni-based alloys in molten halide salts at 500-800 °C is a technical challenge for advanced nuclear and solar thermal storage. This research combines 3D electron microscopy with crystallographic and chemical analysis to investigate corrosion mechanisms in Ni-Cr alloys exposed to molten fluoride salts. Results suggest that grain boundaries play an important role in corrosion of Ni-Cr alloys at intermediate temperatures, facilitating Cr dealloying by diffusion induced grain boundary migration (DIGM), and diffusion induced recrystallization (DIR). This leads to corroded microstructures resembling discontinuous precipitation, but produced by selective dissolution rather than phase transformations. Furthermore, the selective dissolution of Cr results in composition gradients that, in combination with elevated diffusion rates, can induce DIR. These observations differ from classical dealloying theory in aqueous or liquid metal systems at low or high homologous temperatures. It is proposed that dealloying in molten salts at intermediate homologous temperatures is a GB-assisted bulk dealloying phenomenon. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Other |