Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster Session I

MM 20.7: Poster

Dienstag, 24. März 2009, 14:45–16:30, P4

How to apply a simulation of field evaporation of intermetallic phases to extract material parameters — •Torben Boll and Talaat Al-Kassab — Institut für Materialphysik, Georg-August Universität Göttingen, 37077 Göttingen, Friedrich-Hund-Platz 1

In this contribution the authors will present a model of the field evaporation process, which is used to reconstruct 3D AtomProbe Tomography (APT) data. The model is based on the commonly used Müller-Schottky-Method to calculate field evaporation field strengths. The simulations are valid for universal formulation and will be focused towards intermetallic phases, such as L1₀-TiAl and L1₂-Cu₃Au in this presentation. By comparing the results of the simulations with experimental data with the AtomVicinity algorithm material parameters such as the Cu-Au binding energy, the ionization energy or field evaporation field strengths of the respective species can be estimated. Artifacts that are visible in the experimental APT-data can be explained as well. The AtomVicinity algorithm explores the local environment of the atoms and delivers the site occupation of the different species at the respective sublattice positions.