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Related Experiment Videos

Misorientation mapping for visualization of plastic deformation via electron back-scattered diffraction.

L N Brewer1, M A Othon, L M Young

  • 1General Electric Global Research Center, One Research Circle, Niskayuna, NY 12309, USA. lnbrewe@sandia.gov

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|May 8, 2007
PubMed
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A new method visualizes plastic deformation around microstructural features using electron back-scattered diffraction (EBSD) data. This technique enhances the study of material fatigue and stress corrosion cracking by mapping intragrain misorientation.

Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Mapping plastic deformation is crucial for understanding material failure mechanisms like fatigue and stress corrosion cracking.
  • High strain gradient microstructural features significantly influence material behavior under stress.

Purpose of the Study:

  • To develop and describe a novel method for visualizing plastic deformation within electron back-scattered diffraction (EBSD) data.
  • To enable clearer analysis of deformation zones around critical microstructural features.

Main Methods:

  • The technique involves mapping intragrain misorientation in polycrystalline metals.
  • An algorithm calculates scalar misorientation relative to a reference pixel within each grain.
  • Tested on 304 stainless steel with Vickers indentation, fatigue, and stress corrosion cracks.

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Main Results:

  • Successfully visualized plastic deformation zones around microstructural features.
  • Demonstrated the technique's effectiveness on 304 stainless steel under various conditions.
  • Standard EBSD data can be utilized for detailed deformation mapping.

Conclusions:

  • The developed method provides clear visualization of plastic deformation around high strain gradient features.
  • This technique offers a valuable tool for researchers studying material fatigue and fracture.
  • Facilitates advanced analysis of material deformation using conventional EBSD data.