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Related Experiment Videos

Microdiffraction and analysis.

J Zhu1

  • 1Metal Physics Laboratory, Central Iron and Steel Research Institute, Beijing, People's Republic of China.

Journal of Electron Microscopy Technique
|December 1, 1987
PubMed
Summary
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Electron beam coherence is crucial for microdiffraction pattern analysis. This study demonstrates microdiffraction and EDS for identifying precipitates and HREM for characterizing defect structures in materials science.

Area of Science:

  • Materials Science
  • Electron Microscopy
  • Solid State Physics

Background:

  • The intensity distribution in microdiffraction patterns is highly sensitive to the coherence of the electron source.
  • Coherence width at the specimen level serves as a key parameter for assessing electron microscope coherence.

Purpose of the Study:

  • To illustrate the application of microdiffraction in materials characterization.
  • To demonstrate the identification of nanoscale precipitates and defect structures.

Main Methods:

  • Microdiffraction analysis
  • Energy Dispersive Spectroscopy (EDS)
  • High-Resolution Electron Microscopy (HREM) imaging

Main Results:

Related Experiment Videos

  • Successfully identified a small MgNi2 interphase precipitate in an Ni superalloy using microdiffraction and EDS, which was undetectable by conventional TEM and SAD.
  • Determined a defect structure using microdiffraction and HREM, which caused variations in lattice extinction spot intensities in diffraction patterns.

    • Conclusions:

    • Microdiffraction is a powerful technique for analyzing nanoscale features and defect structures.
    • The combination of microdiffraction with EDS and HREM provides enhanced capabilities for materials characterization.