About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Coupled Effects of Potential, Microstructure, Temperature, Composition, and Irradiation on Molten Fluoride Salt Corrosion of Ni-Cr Alloys |
| Author(s) |
John Scully, Harjot Singh, Elena Romanovskaia, Avi Patel, Ho Lun Chan, Valentin Romanovski |
| On-Site Speaker (Planned) |
John Scully |
| Abstract Scope |
The long-term reliability of structural materials is critical for the safe operation of high-temperature Generation IV molten salt reactors (MSRs), where selective dealloying of less noble elements (e.g., Cr) remains a key challenge. In this work, the corrosion dealloying behavior of model binary Ni-Cr alloys (2-20 wt.%) was studied in molten LiF-NaF-KF (FLiNaK) eutectic salt. Applied electrochemical potential regulates selective Cr oxidation relative to Nernst potentials. The corrosion regime and the resulting morphology are a function of thermodynamic and kinetic factors. Cold-rolled alloys (10-50% thickness reduction) exhibit accelerated dealloying, wherein dislocation substructures serve as short-circuit paths for outward Cr transport. These factors, as well as temperature (500-700 °C), govern the types of morphology (e.g., bicontinuous porosity). Cr content controls the onset and extent of bicontinuous porosity. Ni ion irradiation (up to 60 dpa) produced different dealloying behavior compared to annealed controls. Post-test SEM, EBSD, and STEM characterization elucidates each contribution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, High-Temperature Materials, Characterization |