|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Effect of Melt Composition on Morphological Evolution during Liquid Metal Dealloying
||Longhai Lai, Bernard Gaskey, Jonah Erlebacher, Alain Karma
|On-Site Speaker (Planned)
Liquid metal dealloying (LMD) is a novel technique to produce nanocomposite and open nanoporous structures with ultra-high interfacial area for diverse applications. Previous studies of LMD considered the case where a solid alloy (e.g. Ta-Ti) is placed in contact with a pure liquid metal (e.g. Cu), which selectively dissolves the miscible element of the alloy (Ti). Here we study computationally and experimentally the more general case where the liquid metal also contains the miscible alloy element using Ta-Ti alloys in contact with Cu-Ti melts. Phase-field simulations show that Ti addition in the melt leads to slower dealloying kinetics and increased ligament width. In addition, it yields a transition to a morphologically stable planar dissolution regime when the Ti concentration exceeds a threshold that is weakly dependent on the base alloy composition. The existence of this transition is validated experimentally and explained theoretically within the framework of interfacial spinodal decomposition.
||Planned: Supplemental Proceedings volume