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Related Experiment Videos

A model accounting for spatial overlaps in 3D atom-probe microscopy.

D Blavette1, F Vurpillot, P Pareige

  • 1Group of Material Physics, UMR CNRS 6634-UFR Sciences, Universite de Rouen, Mont-Saint-Aignan, France. didier.blavette@univ-rouen.fr

Ultramicroscopy
|January 5, 2002
PubMed
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This study presents a new analytical model to correct spatial resolution errors in three-dimensional atom probe analysis, improving the accuracy of composition determination for small precipitates. The model accurately predicts ion trajectory overlaps, crucial for materials science research.

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Three-dimensional atom probe (3DAP) spatial resolution is limited by ion trajectory aberrations near specimen surfaces.
  • Accurate compositional analysis of nanoscale precipitates is challenging due to these aberrations.

Purpose of the Study:

  • To develop an analytical model to correct for spatial overlaps in 3DAP analysis.
  • To determine the true composition of small spherical precipitates by accounting for trajectory aberrations.
  • To apply the model to copper precipitation in FeCu alloys.

Main Methods:

  • Development of an analytical model for ion trajectory overlaps near phase interfaces.
  • Comparison of model predictions with simulations of ion trajectories.

Related Experiment Videos

  • Parameterization of overlap rate based on observed atomic density in precipitates.

    • Main Results:

    • The model accurately corrects apparent composition for small spherical precipitates.
    • Overlap rate predictions showed good agreement with trajectory simulations.
    • A mixed zone thickness of 0.3 nm was determined for beta precipitates under specific conditions.

    Conclusions:

    • The developed analytical model effectively enhances the accuracy of 3DAP compositional analysis.
    • This method is vital for precise characterization of nanoscale precipitates in materials.
    • The findings have direct applications in understanding precipitation phenomena, such as in FeCu alloys.