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Sub-micron resolution selected area electron channeling patterns.

J Guyon1, H Mansour2, N Gey1

  • 1Laboratoire d'Étude des Microstructures et de Mécanique des Matériaux (LEM3), UMR CNRS 7239, Université de Lorraine, 57045 Metz, France; Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, France.

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Summary

A new method for collecting high-resolution selected area channeling patterns (HR-SACPs) offers sub-micron spatial resolution and high angular accuracy. This technique enables advanced electron channeling contrast imaging (ECCI) for fine-grained materials.

Keywords:
EBSDECCIFEG-SEMGemini columnRocking beamSACP

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Crystallography

Background:

  • Quantitative electron channeling contrast imaging (ECCI) relies on accurate selected area channeling patterns (SACPs).
  • Previous commercial SACP modes lacked sufficient spatial resolution and are largely unavailable.
  • High-resolution SACPs are crucial for analyzing fine-grained or strained materials.

Purpose of the Study:

  • To develop a novel technique for collecting high-resolution SACPs (HR-SACPs) with improved spatial resolution and angular accuracy.
  • To enable accurate ECCI (A-ECCI) studies on challenging material samples.
  • To provide insights for future HR-SACP mode development.

Main Methods:

  • Developed a HR-SACP technique on a Gemini column FEG-SEM.
  • Integrated aperture alignment coils for beam rocking and a calibrated beam shift for precise positioning.
  • Proposed a new methodology for measuring SACP spatial resolution.
  • Combined HR-SACP with electron backscatter diffraction (EBSD) for pattern indexing.

Main Results:

  • Achieved the first demonstrated sub-micron spatial resolution for SACPs.
  • Obtained high angular accuracy of approximately 0.1° at a 10mm working distance.
  • Demonstrated the technique's adequacy for indexing HR-SACPs within a 4° rocking angle limit.
  • Validated the method for Accurate ECCI (A-ECCI) studies.

Conclusions:

  • The novel HR-SACP technique significantly advances quantitative ECCI capabilities.
  • This method is suitable for analyzing very fine-grained and highly strained materials.
  • The developed approach offers valuable insights for next-generation high-resolution electron column development.