About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Morphologies of dealloying corrosion attack at grain boundaries: 1D wormholes, 2D planes, and 3D structures |
| Author(s) |
Nathan Bieberdorf, Laurent Capolungo, Mark Asta |
| On-Site Speaker (Planned) |
Nathan Bieberdorf |
| Abstract Scope |
Alloys in molten salt environments can degrade via "dealloying," wherein selective dissolution into the corrosive medium precedes formation of porous, bicontinuous 3D structures. Recent experiments have shown that dealloying can be accelerated at grain boundaries and form deep 2D planar and 1D "wormhole" channels. These phenomena are expected to severely compromise the structural integrity of polycrystalline alloys, but the mechanisms underlying their formation remain hidden. In this work, we use phase field modeling to simulate dealloying corrosion at grain boundaries. We reveal a novel grain boundary migration-assisted dealloying mechanism, which can potentially rationalize the diverse 3D, 2D, and 1D microstructures observed in experiments. We summarize a unifying explanation for dealloying morphology selection in polycrystalline alloys, providing an important step towards their design to withstand dealloying corrosion environments. Part of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Environmental Effects, Computational Materials Science & Engineering |