| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Dealloying of Post-Cold Rolled Model Ni-Cr alloy in Molten FLiNaK Salts |
| Author(s) |
Ho Lun Chan, Sean H. Mills, Elena Romanovskaia, Valentin Romanovski, Iliana Marrujo, Peter Hosemann, Andrew Minor, John Scully |
| On-Site Speaker (Planned) |
Ho Lun Chan |
| Abstract Scope |
Molten salt reactor environments present challenges to structural materials. One of these issues is the selective dealloying of Cr, which can be accelerated by dislocations serving as fast transport paths for outward Cr diffusion. In this work, the dealloying behavior of Ni-Cr alloy (5-20wt.%) was studied in molten LiF-NaF-KF at 600°C. Alloys were cold-rolled to achieve 10%, 30%, and 50% reduction of thickness, introducing a high density of dislocation in the grain interior and on the grain boundary (GB) as well as the formation of finer, fragmented, recrystallized grains that increase the fraction of GB exposed for corrosion dealloying. Samples were subjected to potentiostatic holds in a potential regime where only Cr dissolves. Post-dealloyed samples were characterized by SEM, EBSD, and STEM to elucidate the effect of dislocation structure on dealloying, as well as the rates and depths of penetration compared to the annealed control sample with minimal cold work. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, High-Temperature Materials, Environmental Effects |