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Title: Prediction of potential pseudo-symmetry issues in the indexing of electron backscatter diffraction patterns

Abstract

A new methodology to predict potential pseudo-symmetric or systematically mis-indexed orientations for an arbitrary crystal structure is presented. The method leverages the recently proposed spherical indexing algorithm to index electron backscatter diffraction patterns. Potential pseudo-symmetric orientations are interpreted as secondary peaks in the autocorrelation of the Kikuchi sphere. The generality of the method is illustrated using a number of crystal systems, ranging from nickel, where no significant pseudo-symmetric issues are expected, to SrTiO 3, with mild occurrence of such issues, to the olivine series, γ-TiAl and U-6%Nb systems, where the traditional Hough method systematically mis-indexes the pseudo-symmetric variants. Here, the method predicts the severity of potential pseudo-symmetric matches and ranks all variants using a normalized autocorrelation coefficient.

Authors:
 [1];  [2];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1575873
Report Number(s):
LLNL-JRNL-787810
Journal ID: ISSN 1600-5767; JACGAR; 983893
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Crystallography (Online)
Additional Journal Information:
Journal Name: Journal of Applied Crystallography (Online); Journal Volume: 52; Journal Issue: 5; Journal ID: ISSN 1600-5767
Publisher:
International Union of Crystallography
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electron backscatter diffraction; EBSD; pseudo-symmetry; autocorrelation; spherical harmonic transform

Citation Formats

Lenthe, William, Singh, Saransh, and De Graef, Marc. Prediction of potential pseudo-symmetry issues in the indexing of electron backscatter diffraction patterns. United States: N. p., 2019. Web. doi:10.1107/S1600576719011233.
Lenthe, William, Singh, Saransh, & De Graef, Marc. Prediction of potential pseudo-symmetry issues in the indexing of electron backscatter diffraction patterns. United States. doi:10.1107/S1600576719011233.
Lenthe, William, Singh, Saransh, and De Graef, Marc. Mon . "Prediction of potential pseudo-symmetry issues in the indexing of electron backscatter diffraction patterns". United States. doi:10.1107/S1600576719011233.
@article{osti_1575873,
title = {Prediction of potential pseudo-symmetry issues in the indexing of electron backscatter diffraction patterns},
author = {Lenthe, William and Singh, Saransh and De Graef, Marc},
abstractNote = {A new methodology to predict potential pseudo-symmetric or systematically mis-indexed orientations for an arbitrary crystal structure is presented. The method leverages the recently proposed spherical indexing algorithm to index electron backscatter diffraction patterns. Potential pseudo-symmetric orientations are interpreted as secondary peaks in the autocorrelation of the Kikuchi sphere. The generality of the method is illustrated using a number of crystal systems, ranging from nickel, where no significant pseudo-symmetric issues are expected, to SrTiO3, with mild occurrence of such issues, to the olivine series, γ-TiAl and U-6%Nb systems, where the traditional Hough method systematically mis-indexes the pseudo-symmetric variants. Here, the method predicts the severity of potential pseudo-symmetric matches and ranks all variants using a normalized autocorrelation coefficient.},
doi = {10.1107/S1600576719011233},
journal = {Journal of Applied Crystallography (Online)},
number = 5,
volume = 52,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
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