Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I: Fragility and Dynamics of Metallic Glasses

MM 4.3: Vortrag

Montag, 16. März 2015, 10:45–11:00, H 0107

Atomic dynamics in Zr-based glass forming melts — Sri Wayuni Basuki¹, Elisabeth Gill¹, Klaus Rätzke¹, •Franz Faupel¹, Fan Yang², and Andreas Meyer² — ¹Univ. Kiel, Chair for Multicomponent Materials, D-24143 Kiel, Germany — ²DLR, D-51170 Köln, Germany

Recently, we reported a strong decoupling of Zr-95 and Co-57 radiotracer diffusivities in a bulk metallic glass forming Zr_46.75Ti_8.25Cu_7.5Ni₁₀Be_27.5 melt (Vitreloy 4) far above the liquidus temperature [1] suggesting the development of solid-like, i.e. energy-landscape controlled, features already in the stable liquid state more than 300 K above the mode coupling T_c [1]. Meanwhile, we performed similar simultaneous radiotracer diffusion experiment of Co-57 and of Zr-95 in binary Zr-Ni and ternary Zr-Ni-Al alloys with a largely reduced glass-forming ability above the liquidus temperature. Here, a much less pronounced decoupling was observed. The results will be discussed in terms of recent theoretical approaches on atomic dynamics of metallic melts.

[1] S. W. Basuki, A. Bartsch, F. Yang, K. Rätzke, A. Meyer, and F. Faupel, Phys. Rev. Lett. 113, (2014) 165901