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M: Metallphysik

M 27: Quasikristalle

M 27.2: Vortrag

Montag, 7. März 2005, 10:45–11:00, TU H111

Quasicrystal formation in mechanically alloyed Zr-Ti-Nb-Cu-Ni-Al glassy powders — •Sergio Scudino¹, Ludwig Schultz¹, Jürgen Eckert², Hergen Breitzke³, and Klaus Lüders³ — ¹IFW Dresden, Institut für Metallische Werkstoffe, Postfach 270016, D-01171 Dresden, Germany — ²FB 11 Material- und Geowissenschaften, FG Physikalische Metallkunde, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany — ³Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Differently from the glassy Zr₅₇Ti₈Nb_2.5Cu_13.9Ni_11.1Al_7.5 melt-spun ribbon that forms an icosahedral quasicrystalline phase upon devitrification, the corresponding alloy produced by mechanical alloying of elemental powder mixtures does not clearly show quasicrystal formation. However, the addition of an appropriate amount of elemental zirconium to the mechanically alloyed powder changes the crystallization behavior inducing the formation of the quasicrystalline phase. This indicates that for this multi-component metallic glass quasicrystal formation in the mechanically alloyed powder is crucially linked to the composition rather than to the question whether there is a special quenched-in short-range order. This work was supported by the German Science Foundation under grants Ec 111/10-1,2 and Lu 217/17-1.