Pattern center determination in electron backscatter diffraction microscopy
Jay Basinger1, David Fullwood, Josh Kacher
1Department of Mechanical Engineering, Brigham Young University, 435 Crabtree Building, Provo, UT 84602, USA. jay.basinger@gmail.com
Accurate electron backscatter diffraction (EBSD) pattern center determination is crucial for high-resolution imaging. This study presents a novel method using a virtual spherical screen to refine pattern center (PC) alignment, improving EBSD data interpretation.
Area of Science:
- Materials Science
- Crystallography
- Electron Microscopy
Background:
- Electron Backscatter Diffraction (EBSD) is vital for analyzing material microstructures.
- Precise determination of the pattern center (PC) is essential for accurate EBSD analysis, especially at high resolutions.
- Current methods may lack the precision required for advanced EBSD applications.
Purpose of the Study:
- To develop and present a refined method for determining the electron backscatter diffraction pattern center (PC).
- To improve the accuracy of EBSD data interpretation by enhancing PC determination.
- To address the challenges associated with high-resolution EBSD analysis.
Main Methods:
- A novel PC refinement algorithm is introduced.
- The method maps Kikuchi bands from a planar phosphor screen onto a virtual spherical screen.
- It measures deviations of band edges from great circles and parallelism to quantify PC accuracy.
Main Results:
- The PC refinement algorithm was applied to simulated and experimental EBSD patterns.
- The method demonstrated its effectiveness in improving PC accuracy.
- Sources of noise and error were identified and mitigation strategies discussed.
Conclusions:
- The proposed virtual spherical screen method offers enhanced precision for PC determination in EBSD.
- This advancement is critical for high-resolution EBSD and detailed microstructural analysis.
- The algorithm provides a robust approach to improving the reliability of EBSD data.
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