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A Pattern Processing Method to Map Nanoscale Phases by EBSD.

Etienne Brodu1, Aimo Winkelmann2, Marc Seefeldt1

  • 1Department of Materials Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, B-3001Heverlee, Belgium.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
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Summary
This summary is machine-generated.

This study introduces a new method to analyze nanoscale phases using electron backscatter diffraction (EBSD). The technique retrieves faint signals from minority phases, enabling detailed crystallographic analysis previously impossible with EBSD.

Keywords:
cementiteelectron backscatter diffraction (EBSD)overlapped patternspattern matchingpearlitespatial resolution

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Area of Science:

  • Materials Science
  • Crystallography
  • Electron Microscopy

Background:

  • Electron backscatter diffraction (EBSD) typically cannot analyze nanoscale phases due to signal dominance by the matrix phase.
  • Transmission electron microscopy (TEM) is the traditional method for analyzing such small features.

Purpose of the Study:

  • To develop a novel postprocessing method for EBSD to detect and analyze nanoscale minority phases.
  • To overcome the limitations of conventional EBSD in characterizing sub-micron features.

Main Methods:

  • A postprocessing technique is presented to extract faint secondary diffraction signals from nanoscale phases.
  • This involves a close-neighbor pattern subtraction routine to remove the dominant matrix phase signal.
  • Conventional Hough indexing and pattern matching methods are then applied to the processed data.

Main Results:

  • The developed method successfully retrieves valuable crystallographic information from nanoscale minority phases.
  • It allows for the determination of crystallography, spatial distribution, morphology, and orientation of these small features.
  • The technique was successfully applied to nanolamellar pearlitic steel, a material previously inaccessible to EBSD analysis.

Conclusions:

  • The novel EBSD postprocessing method enables the characterization of nanoscale phases.
  • This significantly expands the applicability of EBSD for materials science research.
  • The technique offers a powerful alternative for analyzing microstructures with fine-scale features.