Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 6: Symposium Complex Metallic Alloys I

M 6.1: Vortrag

Freitag, 4. März 2005, 11:00–11:15, TU H1058

Syntesis and crystal growth of Complex Metallic Alloys (CMA) — •Wolf Assmus¹, Stefan Brühne¹, Michael Feuerbacher², Guido Kreiner³, and Eckhard Uhrig¹ — ¹Physikalisches Institut, Johann Wolfgang Goethe-Universität, Robert-Mayer-Str. 2-4, D-60054 Frankfurt am Main — ²Institut für Mikrostrukturforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich — ³MPI für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, D-01187 Dresden

In the Virtual Integrated Laboratory A (VIL A – Materials Design and Synthesis) a number of european labs are working in a NoE on materials design, synthesis and crystal growth of CMA. All methods which are necessary for this research field as e.g. DTA, EMPA, X-ray analysis; especially for materials preparation and crystal growth techniques as arc-melting, melt-spinning, zone-melting, Czochralski, Bridgman or flux growth are available. Some examples of recent research in VIL A are discussed: Icosahedral and periodic Mg-Zn-RE alloys and a variety of periodic, huge unit cell Mg-Zn, Al-Pd, Al-Mg and related ternary CMA have been grown. For the growth of such complex alloys information about the phase-diagram must be available. It is important to know whether the phase is formed by direct cooling of the melt (congruent melting behaviour) or by peritectic or peritectoidic reaction. As another example in the Mg-Pd system it is shown that the phase width of Mg₆Pd (cF396) can be well understood from correlated disorder of only two atom sites in the a≈ 2 nm cubic unit cell.