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TEM nano-Moiré evaluation for invisible lattice structure near grain interface


Moiré technique is a powerful, important and effective tool for scientific research, from nano-scale to macro-scale, of which is essentially the interference between two or more periodic structures with similar frequency. In this study, an inverse transmission electron microscope (TEM) nano-Moiré method was proposed, for the first time, to reconstruct the invisible lattice structure near grain interface, where only one kind of lattice structure and Moiré fringe was visible in a high resolution TEM (HRTEM) image simultaneously. The inversion process was introduced 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 coatings (TBCs) 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 the 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 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 TBCs spallation from nano-scale to micro-scale were discussed.

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Publication details

The article was received on 14 Jun 2017, accepted on 11 Sep 2017 and first published on 14 Sep 2017

Article type: Paper
DOI: 10.1039/C7NR04262K
Citation: Nanoscale, 2017, Accepted Manuscript
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    TEM nano-Moiré evaluation for invisible lattice structure near grain interface

    H. Zhang, H. Wen, Z. Liu, Q. Zhang and H. Xie, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04262K

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