Regensburg 2004 – wissenschaftliches Programm
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M: Metallphysik
M 31: Quasikristalle II
M 31.3: Vortrag
Donnerstag, 11. März 2004, 17:00–17:15, H16
Influence of Al and Zr on quasicrystalline phase formation in Zr-Ti-Nb-Cu-Ni-Al metallic glasses — •Sergio Scudino1, Jürgen Eckert2, Uta Kühn1, Hergen Breitzke3, Klaus Lüders3 und Ludwig Schultz1 — 1IFW Dresden, Institut für Metallische Werkstoffe, Postfach 270016, D-01171 Dresden, Germany — 2Fachbereich 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
The influence of Al and Zr on the crystallization behavior of Zr-Ti-Nb-Cu-Ni-Al melt-spun glassy ribbons with different Al and Zr content have been investigated. The devitrification is characterized by the formation of a quasicrystalline phase even for the alloy without Al, demonstrating that Al is not essential for quasicrystal formation in the present alloys. With decreasing Al content, the temperature range of stability of quasicrystals increases whereas the thermal stability of the amorphous phase decreases together with a slight decrease of the extension of the supercooled liquid region. Furthermore, the grain size of the quasicrystalline phase increases with decreasing Al content. An equivalent effect on both thermal stability and microstructure can be achieved by increasing Zr content. This suggests the possibility to use Al and Zr for tuning the thermal stability as well as the microstructure evolution upon heating. This work was supported by the German Science Foundation under grants Ec 111/10-1,2 and Lu 217/17-1