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Evaluation of misindexing of EBSD patterns in a ferritic steel
Author(s) -
KARTHIKEYAN T.,
DASH M.K.,
SAROJA S.,
VIJAYALAKSHMI M.
Publication year - 2013
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2012.03676.x
Subject(s) - electron backscatter diffraction , orientation (vector space) , diffraction , materials science , coincidence , detector , lattice (music) , zone axis , crystallography , symmetry (geometry) , kikuchi line , optics , electron diffraction , geometry , physics , chemistry , mathematics , reflection high energy electron diffraction , acoustics , medicine , alternative medicine , pathology
Summary The systematic misindexing caused by pseudo‐symmetry Kikuchi diffraction patterns in automated Electron Backscatter Diffraction analysis has been studied in a 9Cr‐1Mo ferritic steel. Grains with its [1 1 1] directed towards detector centre were found to be prone to misindexing, and the solutions exhibit a relative orientation of ±30° and 60° about the common [1 1 1] axis (as compared to the true orientation). Fictitious boundaries were detected within such grains, which satisfy the Σ3 or Σ13b type coincidence site lattice boundary criteria. Misindexing rate was reduced with more than six detected bands, but 30° rotated solution was comparatively more persistent, as the additional bands of (3 1 0)‐type exhibited a nearly good pattern match. Increase in detector collection angle to 0.96 sr or number of detected bands to nine were found to be beneficial in preventing the misindexing problem.