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The characterization of low-angle boundaries by EBSD
P S Bate1, R D Knutsen, I Brough
1Materials Science Centre, University of Manchester, UK.
Journal of Microscopy
|November 5, 2005
Summary
This study presents an enhanced electron backscatter diffraction (EBSD) method for precise misorientation measurement, improving angular resolution over 30-fold. It also identifies analysis artifacts and highlights the diffraction pattern area as a potential EBSD limitation for microstructural analysis.
Area of Science:
- Materials Science
- Crystallography
- Electron Microscopy
Background:
- Electron Backscatter Diffraction (EBSD) is a key technique for microstructural characterization.
- Accurate measurement of crystallographic misorientations is crucial for understanding material properties.
- Existing EBSD methods have limitations in angular resolution and spatial accuracy.
Purpose of the Study:
- To describe an extended method for accurate misorientation measurement using EBSD.
- To evaluate the improvement in angular resolution and misorientation axis determination.
- To investigate the source of small orientation changes near low-angle boundaries and assess EBSD's microstructural characterization limits.
Main Methods:
- Extension of Wilkinson's method for EBSD pattern comparison.
- Application of the enhanced method to linescan analysis.
- Analysis of diffraction pattern generation area versus EBSD spatial resolution.
Main Results:
- The enhanced EBSD method improved angular resolution by over 30 times.
- Significant improvements were observed in determining misorientation axes.
- Small orientation changes near low-angle boundaries were identified as analysis artifacts.
- The diffraction pattern generation area was found to be larger than the effective EBSD spatial resolution.
Conclusions:
- The developed EBSD method significantly enhances the accuracy of misorientation measurements.
- Analysis artifacts can arise from the technique, necessitating careful interpretation.
- The size of the diffraction pattern generation area may limit EBSD's effectiveness in detailed microstructural characterization.
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