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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.