TEM nano-Moire evaluation for an invisible lattice structure near the grain interface
TEM nano-Moire evaluation for an invisible lattice structure near the grain interface
复制标题
晶粒界面附近不可见晶格结构的 TEM 纳米莫尔条纹评估
DOI：
10.1039/c7nr04262k
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发表时间：
2017
期刊：
影响因子：
6.7
通讯作者：
Xie Huimin
中科院分区：
文献类型：
--
作者：
Zhang Hongye;Wen Huihui;Liu Zhanwei;Zhang Qi;Xie Huimin
莫尔技术是一种强大的、重要的和有效的科学研究工具，从纳米尺度到宏观尺度，其本质是两个或多个具有相似频率的周期性结构之间的干涉。在这项研究中，一个逆透射电子显微镜（TEM）纳米莫尔方法已被提出，第一次，重建一个不可见的晶格结构附近的晶粒界面，只有一种晶格结构和莫尔条纹是可见的高分辨率TEM（HRTEM）图像同时。详细地进行了反演过程。为了保证反演结果的唯一性，提出了三条准则。采用高分辨透射电镜（HRTEM）观察了热障涂层（TBC）结构中顶层涂层/热生长氧化物界面的可见点阵和莫尔条纹共存的现象。利用逆TEM纳米云纹法，反演了不可见的下层晶格，并在一定程度上重建了界面附近的三维结构。采用子集几何相分析方法，同时获得了取向不可见点阵和可见点阵的真实的应变场以及晶内和晶界附近莫尔条纹的相对应变场。讨论了TBC颗粒从纳米尺度到微米尺度的可能失效机理和失效部位。
Moiré technique is a powerful, important and effective tool for scientific research, from the nano-scale to the macro-scale, which is essentially the interference between two or more periodic structures with a similar frequency. In this study, an inverse transmission electron microscopy (TEM) nano-Moiré method has been proposed, for the first time, to reconstruct an invisible lattice structure near the grain interface, where only one kind of lattice structure and Moiré fringe were visible in a high resolution TEM (HRTEM) image simultaneously. The inversion process was performed in detail. Three rules were put forward to ensure the uniqueness of the inversion result. The HRTEM image of a top-coat/thermally grown oxide interface in a thermal barrier coating (TBC) structure was observed with coexisting visible lattice and Moiré fringes. Using the inverse TEM nano-Moiré method, the invisible lower layer lattice was inversed and a 3-dimensional structure near the interface was also reconstructed to some degree. The real strain field of oriented invisible and visible lattices and the relative strain field of the Moiré fringe in the grain and near the grain boundary were obtained simultaneously through the subset geometric phase analysis method. The possible failure mechanism and position of the TBC spallation from the nano-scale to the micro-scale were discussed.