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MM: Fachverband Metall- und Materialphysik
MM 31: Postersitzung II
MM 31.45: Poster
Wednesday, March 16, 2011, 17:15–18:45, P5
The effect of cooling rate on undercooling of pure Sn single drop — •Bin Yang1, Yulai Gao2, Alexander S. Abyzov3, Evgeny Zhuravlev1, Jürn Schmelzer1, and Christoph Schick1 — 1Institute of Physics, University of Rostock, Germany — 2Shanghai Key Laboratory of Modern Metallurgy & MaterialsProcessing, Shanghai University, China — 3National Science Center, Kharkov Institute of Physics and Technology, Ukraine
The cooling rate dependence of undercooling of pure Sn single drop is studied by the non-adiabatic fast scanning calorimetry in a large range of cooling rate spanning four orders of magnitude. The experimental results and theoretical analysis show that the undercooling can be obviously increased first with increasing cooling rate going over to a stage of slow increase for high cooling rates, which indicates a shelf-like dependence of undercooling on cooling rate before and after a "crossover" at higher cooling rate where two different heterogeneous mechanisms act simultaneously.