Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster Session
MM 26.19: Poster
Dienstag, 23. März 2010, 14:45–16:30, Poster C
Ordering and site occupancy of ternary elements in Fe3Al — •Thomas Rademacher1, Thomas Kresse1, Johannes Deges2, Talaat Al-Kassab3, Georg Frommeyer2, and Reiner Kirchheim1 — 1Institut für Materialphysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2MPI für Eisenforschung GmbH, Max-Planck-Straße 1,40237 Düsseldorf, Germany — 3King Abdullah University of Science & Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
D03-ordered Fe3Al exhibits a number of advantageous properties, such as high-temperature strength, corrosion resistance and low cost. However, the mechanical properties (e.g. low ductility) and high-temperature stability needs to be optimized for technical use which can be performed by the addition of ternary elements. To understand their influence on these properties, the site occupancy needs to be determined.
In this study this is investigated for the ternary elements 4at.%V, 5at.%Cr, 5at.%Mn and 4at.%Ti by means of Atom Probe Tomography (APT). A special analysis algorithm allows resolving the atom layers for different measurement directions which enables determining site preferences. By comparing these APT-measurements with APT-simulations for different site occupancies and orderings, measurement artefacts can be extracted and an enhanced analysis can be performed.