|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Interface-driven Phenomena in Solids: Thermodynamics, Kinetics and Chemistry
||The Atomistic Mechanism of Interface Migration during a Diffusional Structural Phase Transition
||Tao Yang, Yipeng Gao, Dong Wang, Zhen Chen, Yunzhi Wang
|On-Site Speaker (Planned)
Diffusional migration of an interphase boundaries in solids control microstructural evolution during solid-state phase transformations, for which a detailed atomic picture does not exist. Using a combination of phase field crystal modeling and crystallography analysis, we present here a complete atomistic description of the relationship between atomic structure and migration mechanism of a high-index planar interface during a hexagonal to square polymorphic (reconstructive or diffusional) phase transition. In particular we show that a terrace-step interface advances macroscopically in the form of growth ledge without producing any shape strain, while microscopically its migration occurs by opposite shearing on the terraces and climbing of interfacial dislocations on the steps, following a unique one-to-two lattice site correspondence.
||Planned: A print-only volume