Edge-to-edge matching - a new approach to the morphology and crystallography of precipitates
Edge-to-edge matching - a new approach to the morphology and crystallography of precipitates
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发表时间：
1999
影响因子：
6.2
通讯作者：
P. Kelly;Mingxing Zhang
中科院分区：
文献类型：
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作者：
P. Kelly;Mingxing Zhang
采用了一种全新的方法来理解由扩散过程形成的部分相干沉淀物的形态和晶体学-“边缘到边缘匹配”。这种方法是基于Shiflet和Van der Merwe提出的简单而有根据的结果，即当原子行在界面上匹配时，界面能最小化。对于fcc/bcc系统中的各种晶格参数来说，实现这种原子行匹配所必需的几何条件是可能的，只要在每两个相中都有包含这些行的平面的边缘到边缘匹配。这个新模型不依赖于有效性可疑的物理假设，比如存在远程通信。它与现有模型的不同之处在于，它不需要将特定的方向关系作为输入数据的一部分。相反，它能够从第一性原理预测取向关系。描述了fcc/bcc系统边缘到边缘匹配背后概念的发展，对各种不同沉淀的取向关系和习惯面进行了预测，并表明与报道的实验结果非常吻合。
An entirely new approach is taken to understanding the morphology and crystallography of partially coherent precipitates formed by diffusional processes - `edge-to-edge matching'. This approach is based on the simple, well founded result put forward by Shiflet and Van der Merwe - namely that minimization of interfacial energy results when rows of atoms match across the interface. The geometric conditions necessary to achieve this atom row matching are shown to be possible for a variety of lattice parameters in the fcc/bcc system provided there is edge-to-edge matching of planes containing these rows in each of the two phases. This new model does not rely on physical assumptions of dubious validity, such as the existence of a long-range correspondence. It also differs from the existing models in that it does not need to include the particular orientation relationship as part of the input data. Instead it is capable of predicting the orientation relationship from first principles. The development of the concepts behind edge-to-edge matching are described for the fcc/bcc system, predictions of orientation relationships and habit planes are made for a variety of different precipitates and shown to be in extremely good agreement with reported experimental results.