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Refinements for Bragg coherent X-ray diffraction imaging: electron backscatter diffraction alignment and strain field

David Yang1, Mark T Lapington1, Guanze He1

  • 1Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK.

Journal of Applied Crystallography
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

Electron backscatter diffraction (EBSD) can pre-align samples for Bragg coherent X-ray diffraction imaging (BCDI). This method enhances the accuracy of full lattice strain tensor determination in microcrystals.

Keywords:
Bragg coherent X-ray diffraction imagingcrystal orientationelectron backscatter diffractionphase interpolationstrain calculation

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Area of Science:

  • Materials Science
  • Crystallography
  • Diffraction Imaging

Background:

  • Bragg coherent X-ray diffraction imaging (BCDI) enables 3D lattice strain measurement in microcrystals.
  • Determining the full lattice strain tensor requires multiple reflections and accurate crystal orientation.
  • Traditional orientation determination methods for BCDI are often indirect or require specialized equipment.

Purpose of the Study:

  • To present and validate an alternative method for determining crystal orientation for BCDI using electron backscatter diffraction (EBSD).
  • To demonstrate the application of EBSD-derived orientation for multi-reflection BCDI measurements.
  • To develop and apply a refined strain field computation for increased accuracy.

Main Methods:

  • Alignment of Fe-Ni and Co-Fe alloy microcrystals using EBSD on various substrates.
  • Calculation of orientation matrices from EBSD Euler angles and comparison with microbeam Laue diffraction.
  • Multi-reflection BCDI measurements utilizing EBSD-derived orientation for a single Fe-Ni microcrystal.
  • Refined strain field computation using the gradient of the complex exponential of the phase.

Main Results:

  • EBSD successfully determined crystal orientations with an average angular mismatch of less than ~6° compared to microbeam Laue diffraction.
  • EBSD-derived orientation enabled the measurement of five reflections for a single Fe-Ni microcrystal via multi-reflection BCDI.
  • The refined strain field computation demonstrated increased accuracy, particularly in the presence of dislocations.

Conclusions:

  • EBSD is a feasible and effective method for pre-aligning samples for BCDI experiments.
  • The integration of EBSD with BCDI facilitates more efficient and accurate determination of the full lattice strain tensor.
  • The developed strain field computation method enhances the precision of BCDI analysis.