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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Ni-base superalloy single crystal (SX) mosaicity characterized by the Rotation Vector Base Line Electron Back Scatter

P Thome1, S Medghalchi1, J Frenzel1

  • 1Institut für Werkstoffe, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany.

Ultramicroscopy
|September 24, 2019
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Summary

A new Rotation Vector Base Line Electron Back Scatter Diffraction (RVB-EBSD) method quantifies crystal mosaicity in superalloys. This technique reveals small crystallographic deviations and associated dislocations, aiding material science research.

Keywords:
Color coding of crystallographic and microstructural features of crystal mosaicityDendrite misorientationsGeometrically necessary dislocations (GNDs)Single crystal Ni-base superalloys (SX)

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Area of Science:

  • Materials Science
  • Crystallography
  • Electron Microscopy

Background:

  • Studying crystal mosaicity in single crystals is crucial for understanding material properties.
  • Existing methods for orientation imaging have limitations in quantifying subtle crystallographic deviations.

Purpose of the Study:

  • To introduce and validate the novel Rotation Vector Base Line Electron Back Scatter Diffraction (RVB-EBSD) method.
  • To enable the quantification of crystal mosaicity and associated geometrically necessary dislocations (GNDs) in Ni-base superalloy single crystals.

Main Methods:

  • Development of the RVB-EBSD technique, building upon cross-correlation EBSD procedures.
  • Application of Gaussian band pass filtering to enhance over 500,000 experimental patterns.
  • Implementation of a rotation vector approximation and a baseline correction function.

Main Results:

  • The RVB-EBSD method successfully quantifies small crystallographic deviation angles between dendrites.
  • The technique allows for the interpretation of accommodation processes in terms of geometrically necessary dislocations (GNDs).
  • A novel intuitive color-coding system enhances the visualization of crystal mosaicity features.

Conclusions:

  • The RVB-EBSD method provides a powerful new tool for correlative orientation imaging in scanning electron microscopy.
  • This technique offers significant potential for detailed analysis of crystal mosaicity and defect structures in advanced materials.