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Related Experiment Videos

Whole powder pattern modelling.

P Scardi1, M Leoni

  • 1Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano (TN), Italy. paolo.scardi@ing.unitn.it

Acta Crystallographica. Section A, Foundations of Crystallography
|February 8, 2002
PubMed
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A new whole powder pattern modelling (WPPM) method directly refines microstructure parameters from diffraction data. This approach accurately models lattice distortions and grain size in materials like nickel powder.

Area of Science:

  • Materials Science
  • Crystallography
  • Solid State Physics

Background:

  • Traditional diffraction pattern analysis often relies on analytical profile functions.
  • Accurate modeling of microstructure parameters is crucial for understanding material properties.
  • Existing methods can be complex and require multiple refinement steps.

Purpose of the Study:

  • To introduce and validate a novel whole powder pattern modelling (WPPM) procedure.
  • To enable direct, one-step refinement of microstructure parameters from experimental diffraction patterns.
  • To assess the capability of WPPM in modeling lattice distortions and grain size distributions.

Main Methods:

  • Development of a new whole powder pattern modelling (WPPM) approach.
  • Direct modeling of experimental diffraction patterns without analytical profile functions.

Related Experiment Videos

  • Application and testing on ball-milled face-centered cubic (f.c.c.) nickel powder samples.

    • Main Results:

    • Successful one-step refinement of microstructure parameters including lattice parameter and defect content (dislocation density, outer cut-off radius, contrast factor, fault probabilities).
    • Simultaneous refinement of grain-size distribution parameters (mean and variance).
    • Validation of WPPM results through Transmission Electron Microscopy (TEM) imaging.

    Conclusions:

    • The proposed WPPM procedure offers a direct and efficient method for analyzing diffraction data.
    • WPPM accurately models complex microstructural features like lattice distortions and grain size.
    • The method is versatile and applicable to various crystalline materials, including deformed metals and powders.