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Berlin 2005 – scientific programme

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M: Metallphysik

M 6: Symposium Complex Metallic Alloys I

M 6.1: Talk

Friday, March 4, 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 Uhrig11Physikalisches 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.

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