Tutorial: Crystal orientations and EBSD - Or which way is up?

Britton, TB and Jiang, J and Guo, Y and Vilalta-Clemente, A and Wallis, David and Hansen, LN and Winkelmann, A and Wilkinson, AJ (2016) Tutorial: Crystal orientations and EBSD - Or which way is up? Materials Characterization, 117. pp. 113-126. ISSN 1044-5803 DOI https://doi.org/10.1016/j.matchar.2016.04.008

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© 2016 The Authors. Published by Elsevier Inc. 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.

Item Type: Article
Uncontrolled Keywords: NILAREP
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title: Materials Characterization
Volume: 117
Page Range: pp. 113-126
Identification Number: https://doi.org/10.1016/j.matchar.2016.04.008
Depositing User: Sarah Humbert
Date Deposited: 25 Mar 2022 18:10
Last Modified: 25 Mar 2022 18:10
URI: http://eprints.esc.cam.ac.uk/id/eprint/4846

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