MST-8, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Sci Rep. 2013;3:2448. doi: 10.1038/srep02448.
In semi-coherent interface, a superposed network of interface dislocations accommodates the attendant coherency strains in the adjacent crystals and their intersections (referred to as nodes) can act as sinks and sources for point defects because of the low formation energy. Nodes in {111} semi-coherent interfaces are characterized with a spiral pattern (SP), wherein the line direction of each dislocation entering a node curves. The structure of SP nodes is able to switch between condensed and expanded by either reaction with point defects or mechanical deformation. Due to the switching of the node structures, point defect formation energies at nodes can be significantly reduced. Combining atomistic simulation and dislocation theory, these features are proven universal corresponding to the node density and the character of interface dislocations.
在半相干界面中，界面位错的叠加网络可容纳相邻晶体中的伴随相干应变，其交点（称为节点）由于形成能较低，可作为点缺陷的汇和源。{111}半相干界面中的节点具有螺旋图案（SP）的特征，其中进入节点的每个位错的线方向都发生弯曲。SP 节点的结构可以通过与点缺陷的反应或机械变形在凝聚态和扩展态之间切换。由于节点结构的切换，节点处的点缺陷形成能可以显著降低。通过原子模拟和位错理论的结合，这些特征与节点密度和界面位错的特征相对应，被证明是普遍存在的。
