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

Lenthe, William; Singh, Saransh; De Graef, Marc

doi:10.1107/S1600576719011233

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

Journal Article · Mon Sep 23 00:00:00 EDT 2019 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/S1600576719011233· OSTI ID:1575873

Lenthe, William ^[1]; Singh, Saransh ^[2]; De Graef, Marc ^[1]

Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1575873

Report Number(s):: LLNL-JRNL--787810; 983893

Journal Information:: Journal of Applied Crystallography (Online), Journal Name: Journal of Applied Crystallography (Online) Journal Issue: 5 Vol. 52; ISSN 1600-5767; ISSN JACGAR

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
EBSD
autocorrelation
electron backscatter diffraction
pseudo-symmetry
spherical harmonic transform

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

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References (13)

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