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MM: Fachverband Metall- und Materialphysik

MM 31: Topical Session High Temperature Materials II

MM 31.4: Vortrag

Mittwoch, 25. März 2009, 16:00–16:15, IFW A

Thermodynamic calculations on the Pt-Al-Ni-Cr alloy system — •Johannes Preußner, Rainer Völkl, and Uwe Glatzel — Metallische Werkstoffe, Universität Bayreuth, Germany

Creep, oxidation and corrosion resistant platinum base alloys with room temperature ductility have been developed for high temperature applications. In this talk a thermodynamic modelling of the Pt-Al-Cr-Ni system will be presented with special focus on the Pt-rich side. The Cr-Pt binary system has been reassessed with the CALPHAD method, based on experimental data and first principles calculations. The four ternary alloy systems will be presented and compared with experimental data available. A four sublattice model has been chosen to describe the ordering reactions between the high temperature fcc phase and the low temperature L12 and L10 phases, which are stable at many different concentrations throughout a wide range of the Pt-Al-Cr-Ni alloy system.