About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Self-organizing Nano-architectured Materials
|
Presentation Title |
Coupled Coarsening and Dissolution Kinetics during Liquid Metal Dealloying |
Author(s) |
Longhai Lai, Bernard Gaskey, Alyssa Chuang, Jonah Erlebacher, Alain Karma |
On-Site Speaker (Planned) |
Longhai Lai |
Abstract Scope |
Liquid metal dealloying is an established synthesis method to produce bicontinuous structures of two interpenetrating phases by selective dissolution of one alloy element into a metal bath. To date, coarsening of the solid structure behind the dealloying front has been assumed to be controlled by diffusion confined at the solid-liquid interface, in direct analogy with surface diffusion in electrochemical dealloying. We present phase-field simulation and experimental results demonstrating that the coarsening kinetics is strongly influenced by bulk diffusion in the liquid due to the small, albeit finite, solubility of the immiscible alloy element. Liquid-state diffusion causes simultaneous coarsening and dissolution of the ligaments and a dramatic reduction of the genus of the solid structure when the solid fraction is sufficiently reduced. We demonstrate that the coarsening kinetics and the genus can be controlled by varying the solubility of the immiscible element by the choice of bath composition. |
Proceedings Inclusion? |
Undecided |
Keywords |
Modeling and Simulation, |