Applications of multivariate statistical methods and simulation libraries to analysis of electron backscatter diffraction and transmission Kikuchi diffraction datasets

Wilkinson, Angus J and Collins, David M and Zayachuk, Yevhen and Korla, Rajesh and Vilalta-Clemente, Arantxa (2019) Applications of multivariate statistical methods and simulation libraries to analysis of electron backscatter diffraction and transmission Kikuchi diffraction datasets. Ultramicroscopy, 196. pp. 88-98. ISSN 0304-3991

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Abstract

Multivariate statistical methods are widely used throughout the sciences, including microscopy, however, their utilisation for analysis of electron backscatter diffraction (EBSD) data has not been adequately explored. The basic aim of most EBSD analysis is to segment the spatial domain to reveal and quantify the microstructure, and links this to knowledge of the crystallography (e.g. crystal phase, orientation) within each segmented region. Two analysis strategies have been explored; principal component analysis (PCA) and k-means clustering. The intensity at individual (binned) pixels on the detector were used as the variables defining the multidimensional space in which each pattern in the map generates a single discrete point. PCA analysis alone did not work well but rotating factors to the VARIMAX solution did. K-means clustering also successfully segmented the data but was computational more expensive. The characteristic patterns produced by either VARIMAX or k-means clustering enhance weak patterns, remove pattern overlap, and allow subtle effects from polarity to be distinguished. Combining multivariate statistical analysis (MSA) approaches with template matching to simulation libraries can significantly reduce computational demand as the number of patterns to be matched is drastically reduced. Both template matching and MSA approaches may augment existing analysis methods but will not replace them in the majority of applications.

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IITH Creators:
IITH CreatorsORCiD
Korla, RajeshUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: EB strengthening, FE modeling, Flexure, Hybrid strengthening, Interaction diagram, NSM, strengthening, RC beam
Subjects: Others > Metallurgy Metallurgical Engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 29 Oct 2018 04:56
Last Modified: 29 Oct 2018 04:56
URI: http://raiithold.iith.ac.in/id/eprint/4499
Publisher URL: http://doi.org/10.1016/j.ultramic.2018.09.011
OA policy: http://www.sherpa.ac.uk/romeo/issn/0304-3991/
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