About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Self-organizing Nano-architectured Materials
|
Presentation Title |
Grain Boundary Effects in Liquid Metal Dealloying: A Phase Field Study |
Author(s) |
Nathan Bieberdorf, Laurent Capolungo, Mark Asta |
On-Site Speaker (Planned) |
Nathan Bieberdorf |
Abstract Scope |
Nano-porous metals processing by dealloying is very sensitive to the microstructure of the base alloy. In particular, grain boundaries have been observed to significantly vary the parting limit and final ligament morphology in nano-porous dealloyed metals. However, fundamental understanding of the mechanisms by which grain boundaries influence the dealloying process remains incomplete. Here, we use phase-field modeling to study the effects of grain boundaries in model liquid-metal dealloying systems. We find that localized dissolution and grain boundary migration are key mechanisms to dealloying polycrystalline metals, and these mechanisms are controlled by grain boundary properties such as mobility, diffusivity, and energy (all of which are expected to vary with grain-boundary character). Implications of the results for dealloying by different methods will be discussed. |
Proceedings Inclusion? |
Undecided |
Keywords |
Nanotechnology, Modeling and Simulation, Computational Materials Science & Engineering |