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MM: Metall- und Materialphysik

MM 3: Symposium Modern Metallic Materials Design I

MM 3.2: Vortrag

Montag, 27. März 2006, 10:30–10:45, IFW B

Complex intermetallic alloys in the Al-rich region of the ternary Al-Pd-Ni system — •Mariya Yurechko and Philipp Ebert — Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich

The phase diagram and the liquidus surface projection of the ternary Al-Pd-Ni system in the range of 50 to 100 at.% Al was determined using SEM, EDX, XRD, ICP-OES, and TEM. Isothermal sections between 750 and 1100 degrees Celsius illustrate that the binary Al-Pd intermetallic є phase (known also as ξ’ phase) is stable up to 15 at.% Ni. Furthermore, the binary AlPd and AlNi compounds with CsCl structure as well as the hexagonal Al₃Pd₂ and Al₃Ni₂ compounds form continuous ranges of solid solutions, labeled β and δ phases, respectively. No exclusively ternary phase was observed to be stable in the system. The results are compared with the ternary Al-Pd systems containing Mn, Fe, Co, Ru, Rh, or Re and the similarities are discussed. Finally, the growth paths of single crystals of the different phases are derived.