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Problems in determining the misorientation axes, for small angular misorientations, using electron backscatter

Prior1

  • 1Department of Earth Sciences, Liverpool University, Liverpool L69 3BX, U.K.

Journal of Microscopy
|August 25, 1999
PubMed
Summary
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This study experimentally assesses errors in calculating misorientation axes from electron backscatter diffraction (EBSD) data. Current EBSD techniques are reliable for misorientations >20°, but new methods are needed for precise analysis of smaller misorientations (<5°).

Area of Science:

  • Materials Science
  • Crystallography
  • Electron Microscopy

Background:

  • Electron Backscatter Diffraction (EBSD) is crucial for analyzing crystallographic orientations.
  • Accurate calculation of misorientation axes is essential for understanding material properties.
  • Experimental assessment of EBSD data errors is needed for reliable interpretation.

Purpose of the Study:

  • To experimentally evaluate the errors in calculating misorientation axes from EBSD data.
  • To determine the reliability of current EBSD techniques for various misorientation magnitudes.
  • To identify limitations and suggest future directions for EBSD analysis.

Main Methods:

  • EBSD measurements were performed on identical grains subjected to controlled rotations (2° to 180°).

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  • Misorientation magnitudes and axes were calculated from the acquired EBSD data.
  • Error analysis was conducted based on the discrepancies between imposed and calculated rotations.

    • Main Results:

    • Individual misorientation axis measurements are precise for misorientation magnitudes exceeding approximately 20°.
    • Significant errors are observed for misorientation magnitudes below 5°.
    • Current EBSD techniques are satisfactory for characterizing misorientation axes with data sets of 30 measurements for misorientations ≥10°.

    Conclusions:

    • Appreciation of errors is critical when analyzing low-magnitude misorientation data (<5°).
    • Existing EBSD methods are adequate for statistical characterization of misorientations ≥10° with sufficient data.
    • Development of novel EBSD techniques is required for accurate individual misorientation characterization below 5°.