Tutorial: Crystal orientations and EBSD - Or which way is up?
Tutorial: Crystal orientations and EBSD - Or which way is up?
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DOI：
10.1016/j.matchar.2016.04.008
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发表时间：
2016-07-01
影响因子：
4.7
通讯作者：
Wilkinson, A. J.
中科院分区：
文献类型：
--
作者：
Britton, T. B.;Jiang, J.;Wilkinson, A. J.
电子背向散射衍射(EBSD)是一种自动化技术，可以非常快速地测量样品中晶体的取向。有许多复杂的软件包可以显示测量数据。不幸的是，由于晶体的对称性以及显微镜和EBSD软件设置的不同，在将晶体取向与特定的微结构特征联系起来时，可能存在准确性问题。在这篇文章中，我们概述了一系列用于描述晶体取向和坐标系的约定。这些惯例被用来成功地证明，在样品、单胞、极图和衍射图的参照系中使用了一致的参照系。我们建立了一个植根于衍射图测量的坐标系，并随后将其链接到所有其他坐标系。该分析的一个基本结果是注意到需要精确地定义波束移位坐标系以进行一致的3D微结构分析。通过一系列案例研究来检验显微镜设置的特定特征和/或明确的结晶学特征，支持了这一点。这些案例研究可以很容易地在大多数实验室中生成，并提供了一次机会来证明对使用已记录的定向数据的信心。最后，我们还提供了一个简单的软件工具，用MATLAB和Python编写，读者可以用它来比较他们自己的显微镜设置的一致性，并可以作为进一步离线分析的跳板。(C)2016年提交人。由爱思唯尔公司出版。
Electron backscatter diffraction (EBSD) is an automated technique that can measure the orientation of crystals in a sample very rapidly. There are many sophisticated software packages that present measured data. Unfortunately, due to crystal symmetry and differences in the set-up of microscope and EBSD software, there may be accuracy issues when linking the crystal orientation to a particular microstructural feature. In this paper we outline a series of conventions used to describe crystal orientations and coordinate systems. These conventions have been used to successfully demonstrate that a consistent frame of reference is used in the sample, unit cell, pole figure and diffraction pattern frames of reference. We establish a coordinate system rooted in measurement of the diffraction pattern and subsequently link this to all other coordinate systems. A fundamental outcome of this analysis is to note that the beamshift coordinate system needs to be precisely defined for consistent 3D microstructure analysis. This is supported through a series of case studies examining particular features of the microscope settings and/or unambiguous crystallographic features. These case studies can be generated easily in most laboratories and represent an opportunity to demonstrate confidence in use of recorded orientation data. Finally, we include a simple software tool, written in both MATLAB and Python, which the reader can use to compare consistency with their own microscope set-up and which may act as a springboard for further offline analysis. (C) 2016 The Authors. Published by Elsevier Inc.