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Statistical analysis of dislocations and dislocation boundaries from EBSD data.

C Moussa1, M Bernacki1, R Besnard2

  • 1MINES ParisTech, PSL - Research University, CEMEF - Centre de mise en forme des matériaux, CNRS UMR 7635, CS 10207 rue Claude Daunesse 06904 Sophia Antipolis Cedex, France.

Ultramicroscopy
|April 23, 2017
PubMed
Summary
This summary is machine-generated.

Electron BackScatter Diffraction (EBSD) analysis of dislocations in metals can be inaccurate using disorientation alone. Utilizing disorientation gradients provides more accurate Geometrically Necessary Dislocations (GNDs) density measurements, improving upon previous methods.

Keywords:
DislocationsDisorientation GradientElectron BackScatter DiffractionGeometrically Necessary BoundariesIncidental Dislocation BoundariesTantalum

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Area of Science:

  • Materials Science
  • Crystallography
  • Metallurgy

Background:

  • Electron BackScatter Diffraction (EBSD) is commonly employed for semi-quantitative analysis of dislocations in metals.
  • Disorientation is typically used to estimate Geometrically Necessary Dislocations (GNDs) densities.

Purpose of the Study:

  • To demonstrate the inaccuracies of using disorientation for GND density analysis in metals.
  • To introduce and validate the use of disorientation gradients for more accurate GND density assessment using EBSD.

Main Methods:

  • Comparison of GND density calculations using disorientation versus disorientation gradients from EBSD data.
  • Analysis of dislocation boundaries (Geometrically Necessary Boundaries and Incidental Dislocation Boundaries) using misorientation gradients.
  • Application of the developed method to deformed Tantalum samples.

Main Results:

  • Disorientation-based GND density analysis yields physically unjustifiable results, particularly in recrystallized grains.
  • Disorientation gradients effectively account for measurement noise, leading to more accurate GND density determination.
  • The probability density distribution of disorientation gradients from EBSD data aligns with theoretical models for dislocation boundaries (IDBs and GNBs).

Conclusions:

  • Disorientation gradients offer a more reliable method for quantifying GND densities from EBSD data compared to simple disorientation.
  • The study enables separate determination of Incidental Dislocation Boundaries (IDBs) and Geometrically Necessary Boundaries (GNBs) probability density distributions from EBSD.
  • This approach enhances statistical relevance for dislocation boundary analysis in metals, surpassing limitations of Transmission Electron Microscopy (TEM) data.