About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Porous Graphite Fabricated by Liquid Metal Dealloying of Silicon Carbide |
| Author(s) |
Gina Greenidge, Jonah Erlebacher |
| On-Site Speaker (Planned) |
Gina Greenidge |
| Abstract Scope |
Conventional liquid metal dealloying (LMD) is a processing technique whereby one component of an alloy is selectively dissolved in a melt at high temperatures. Microstructural evolution in this process is quite complex and often leads to a bicontinuous topologically-connected two-phase microstructure. We used LMD to prepare porous graphite by dealloying silicon carbide in molten germanium. SiC further complicates phase evolution in LMD by adding a chemical transformation wherein the hybridization of carbon changes from sp3 to sp2. The dealloying depth, concentration profile and length scales of the dealloyed microstructure were examined and we introduce here a quantitative kinetic model for the interface velocity and steady-state concentration profile in the dealloyed layer. Our observations are consistent with rate-limiting kinetics in the germanium side of the interface due to a spatially varying diffusion rate associated with the development of the carbon phase. |
| Proceedings Inclusion? |
Planned: |