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Modeling image distortions in 3DAP.

F Vurpillot1, A Cerezo, D Blavette

  • 1Groupe de Physique des Materiaux, Unite Mixte de Recherche, CNRS 6634, Université de Rouen, 76801 Saint Etienne du Rouvray cedex, France. francois.vurpillot@univ-rouen.fr

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|July 6, 2004
PubMed
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A new numerical model simulates three-dimensional atom probe imaging artifacts in materials. The model accurately replicates experimental observations of local magnification and depth scaling issues in two-phase materials.

Area of Science:

  • Materials Science
  • Computational Modeling
  • Surface Science

Background:

  • Three-dimensional atom probe (3DAP) microscopy is crucial for atomic-scale material analysis.
  • Field evaporation in 3DAP can introduce artifacts, complicating data interpretation, especially in multi-phase materials.

Purpose of the Study:

  • To develop and validate a numerical model for simulating 3D atom probe images.
  • To investigate the origins and characteristics of common imaging artifacts in two-phase materials.

Main Methods:

  • A dynamic numerical model simulating specimen shape evolution during field evaporation.
  • Analysis of local magnification effects based on precipitate size, shape, and orientation.
  • Simulation of grain boundary segregation and multilayer depth scaling artifacts.

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Main Results:

  • Simulations accurately reproduced experimental observations of aberrations caused by small precipitates.
  • Magnification matched theoretical values only for mesoscopic precipitates.
  • Orientation-dependent magnification and grain boundary thickness variations were confirmed.
  • Depth scaling artifacts in multilayer structures were successfully simulated.

Conclusions:

  • The developed numerical model is a valuable tool for understanding and predicting 3D atom probe imaging artifacts.
  • Artifacts are strongly influenced by precipitate characteristics and specimen geometry.
  • The model aids in accurate interpretation of 3DAP data, particularly for complex material systems.