| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
High-Temperature Dealloying in Molten Environments: Insights on Grain Boundary Effects from Phase-Field Modeling |
| Author(s) |
Nathan Bieberdorf, Xueyang Bognarova, Laurent Capolungo, Mark D. Asta |
| On-Site Speaker (Planned) |
Mark D. Asta |
| Abstract Scope |
Metal alloys exposed to high-temperature molten environments can undergo dealloying processes leading to complex nanoporous morphologies formed by the selective dissolution of the less noble component. Such phenomena are observed in liquid-metal and molten-salt environments, and are known to be influenced by interdependent kinetic processes occurring at the metal/molten-liquid interface, bulk solid and liquid phases, as well as grain boundaries. We present results of phase-field modeling based on previously published models of liquid metal dealloying, extended to include grain-boundary effects. The results highlight the ways in which parting instabilities are influenced by bulk and interfacial processes, and the roles of grain boundaries in initiating “worm holes,” localized channels that penetrate rapidly into the alloy. Extensions of the models to electrochemical molten-salt corrosion will be briefly described. This work was supported by the US Department of Energy through the FUTURE EFRC. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, |