Dresden 2011 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 12: Postersitzung I
MM 12.4: Poster
Monday, March 14, 2011, 17:30–19:00, P5
Combined in-situ SAXS/WAXS and HRTEM Study on Crystallization of (Cu60Co40)1−xZrx Metallic Glasses — •B. Schwarz1, U. Vainio2, N. Mattern1, S.W. Sohn3, D. H. Kim3, and J. Eckert1 — 1Leibniz-Institute IFW Dresden, Institute for Complex Materials — 2HASYLAB at DESY, Hamburg — 3Department of Metallurgical Engineering, Center for Noncrystalline Materials, Yonsei University, Seoul, South Korea
The binary Cu-Co system exhibits a metastable liquid-liquid miscibility gap and therefore the ternary Cu-Co-Zr system is a promising candidate to form phase separated glass-glass composites. In this work (Cu60Co40)1−xZrx metallic glasses with x=37 and x=32 were investigated by in-situ small-angle and wide-angle x-ray scattering (SAXS/WAXS) and differential scanning calorimetry (DSC). Certain heat treated samples were additionally investigated by high-resolution transmission electron microscopy (HRTEM). Even for x=32 there are no indications for any kind of phase separation in the as-quenched state within experimental resolution, i.e. the critical temperature Tc for liquid-liquid phase separation has already decreased from 1556 K for binary Cu60Co40 to a temperature below the glass transition temperature Tg = 762(5)K found for (Cu60Co40)68Zr32. Combined in-situ SAXS/WAXS and HRTEM investigations reveal that thermal annealing induces the formation of a composite consisting of nano crystallites embedded in an amorphous matrix.