Misorientation Mapping for Visualization of Plastic Deformation via Electron Back-Scattered Diffraction

The ability to map plastic deformation around high strain gradient microstructural features is central in studying phenomena such as fatigue and stress corrosion cracking. A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and...

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Bibliographic Details
Published in:Microscopy and microanalysis 2006-02, Vol.12 (1), p.85-91
Main Authors: Brewer, L.N., Othon, M.A., Young, L.M., Angeliu, T.M.
Format: Article
Language:English
Subjects:
Algorithms
Alloys - chemistry
Corrosion
Cracks
Fracture mechanics
Grain boundaries
Metallurgy
Methods
MICROANALYSIS
Microscopy, Electron, Transmission
Molecular Conformation
Nickel - chemistry
Nuclear energy
Plastic deformation
Plastics
Reproducibility of Results
Residual stress
Stainless Steel
Strain
Stress corrosion
Stress corrosion cracking
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Summary:The ability to map plastic deformation around high strain gradient microstructural features is central in studying phenomena such as fatigue and stress corrosion cracking. A method for the visualization of plastic deformation in electron back-scattered diffraction (EBSD) data has been developed and is described in this article. This technique is based on mapping the intragrain misorientation in polycrystalline metals. The algorithm maps the scalar misorientation between a local minimum misorientation reference pixel and every other pixel within an individual grain. A map around the corner of a Vickers indentation in 304 stainless steel was used as a test case. Several algorithms for EBSD mapping were then applied to the deformation distributions around air fatigue and stress corrosion cracks in 304 stainless steel. Using this technique, clear visualization of a deformation zone around high strain gradient microstructural features (crack tips, indentations, etc.) is possible with standard EBSD data.
ISSN:1431-9276
1435-8115
DOI:10.1017/S1431927606060120