Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 20: Amorphous and Liquid Materials I

MM 20.2: Vortrag

Dienstag, 28. März 2006, 15:00–15:15, IFW D

Is Cu₄₇Ti₃₃Zr₁₁Ni₈Si₁ a bulk glass former ? — •Shankar Venkataraman¹, Mihai Stoica², Sergio Scudino¹, Ki Buem Kim¹, Ludwig Schultz³, and Jürgen Eckert^1,3 — ¹FG Physikalische Metallkunde, FB 11, Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany — ²Institut National Polytechnique de Grenoble, ENSEEG, LTPCM, 1130 rue de la Piscine, PO Box 75, 38402 St.Martin d’Hères campus, Grenoble, France — ³Institut für Metallische Werkstoffe, Leibniz-Institut für Festkörper-und Werkstoffforschung, Helmholtzstraße 20, D- 01069 Dresden, Germany

The microstructures of Cu₄₇Ti₃₃Zr₁₁Ni₈Si₁ ribbons and rods synthesized by melt spinning and copper mold casting have been investigated using transmission electron microscopy (TEM) as well as high-resolution TEM (HRTEM). Though a fully amorphous microstructure is observed for the as-spun ribbons, a fine nanocrystalline microstructure is observed for the rods suggesting that the bulk glass forming-ability of this alloy has been previously overestimated. This work attempts to address the reasons for the lack of a fully glassy phase in the bulk Cu₄₇Ti₃₃Zr₁₁Ni₈Si₁ alloy.The present study shall also show that the selection of a proper sample preaparation method is also crucial in observing an artifact free microstructure under the TEM. This work was supported by the German Research Foundation (Grant no. Ec 111/12) as well as by the European Union within the framework of the Research Training Network on No-dqductile bulk metallic glass compositesNo-dq (MRTN-CT-2003-504692).