论文标题
界面置式定义由断开介导的
Interface Faceting-Defaceting Mediated by Disconnections
论文作者
论文摘要
晶体系统中几乎所有内部接口的固有特征（同型和异方相）是断开连接的存在（拓扑线缺陷限制在具有阶跃和脱位字符的界面）。断开连接在确定界面热力学和动力学方面起主要作用。我们证明，断开之间的弹性相互作用导致热力学，一阶，有限温度，刻面切面跃迁与实验一致。这些弹性相互作用强烈改变了平衡界面形态（与仅由各向异性表面能量确定的形态相比）以及迁移界面的动力学和形态。我们通过基于一般的，连续断开的模型来证明这些现象，用于界面热力学和动力学，应用于嵌入式颗粒/晶粒，稳态界面迁移几何形状以及名义平坦的接口。
An intrinsic feature of nearly all internal interfaces in crystalline systems (homo- and hetero-phase) is the presence of disconnections (topological line defects constrained to the interface that have both step and dislocation character). Disconnections play a major role in determining interface thermodynamics and kinetics. We demonstrate that elastic interactions between disconnections lead to a thermodynamic, first-order, finite-temperature, faceting-defaceting transition, in agreement with experiments. These elastic interactions strongly modify equilibrium interface morphologies (compared with those solely determined by anisotropic surface energy) as well as the kinetics and morphologies of migrating interfaces. We demonstrate these phenomena through numerical simulations based upon a general, continuum disconnection-based model for interface thermodynamics and kinetics applied to embedded particles/grains, steady-state interface migration geometries, and nominally flat interfaces.
