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Misorientation distributions in hot deformed NaCl using electron backscattered diffraction.

G M Pennock1, M R Drury, P W Trimby

  • 1Vening Meimesz Research School of Geodynamics, Faculty of Earth Sciences, Utrecht University, The Netherlands. gpennock@geo.uu.nl

Journal of Microscopy
|May 9, 2002
PubMed
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This study on hot-deformed sodium chloride (NaCl) reveals how data processing and step size affect subgrain misorientation distributions. Noise significantly impacts low-angle misorientations, but average misorientation values remain reliable across different step sizes.

Area of Science:

  • Materials Science
  • Crystallography
  • Geophysics

Background:

  • Subgrain boundary misorientation distributions are crucial for understanding material deformation.
  • Electron Backscatter Diffraction (EBSD) is a key technique for analyzing these distributions.
  • Hot-deformed sodium chloride (NaCl) provides a model system for studying plastic deformation mechanisms.

Purpose of the Study:

  • To investigate the impact of data processing, noise, and step size on subgrain misorientation distributions in hot-deformed NaCl.
  • To assess the influence of angular resolution limits and non-indexed EBSD patterns on orientation data.
  • To identify and characterize different substructure types in deformed NaCl.

Main Methods:

  • EBSD orientation mapping was employed on hot-deformed and etched NaCl samples.

Related Experiment Videos

  • Analysis focused on deriving subgrain boundary misorientation distributions.
  • Scanning electron microscopy (SEM) was used for substructure identification.

    • Main Results:

    • Processing non-indexed EBSD patterns increased average misorientations in etched NaCl.
    • Noise significantly affected low-angle misorientations at step sizes smaller than the subgrain size.
    • Orientation gradient distributions were unaffected by noise, and average misorientation correlated with strain via a power law.

    Conclusions:

    • Data processing and step size critically influence EBSD-derived misorientation distributions.
    • Noise is a significant factor for small step sizes, while larger step sizes measure orientation gradients.
    • Three distinct substructures (equiaxed, long boundaries, core-mantle) were identified, providing insights into deformation mechanisms.