Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Microstructure and Phase Transformations

MM 26.5: Vortrag

Dienstag, 13. März 2018, 12:45–13:00, TC 010

Melting and solidification of embedded particles at high heating and cooling rates — •Mark Stringe, Christian Simon, Harald Rösner, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, University of Münster, D-48149 Münster

During solidification of metallic particles embedded in a surrounding matrix, nucleation events take place at different sites and thus can depend on the morphology of the interface between particle and matrix. Moreover, the melting behavior of these particles is also different compared to bulk samples due to possible size, shape and pressure effects. In the present work, metallic particles were embedded in a higher melting matrix by the melt spinning technique. The microstructure was analyzed via x-ray diffraction and transmission electron microscopy. The metallic particles are of different sizes ranging from nanometer sized particles in the matrix grain interiors to micron sized particles at the grain boundaries. Using differential scanning calorimetry (DSC) the melting and solidification behavior was examined. Fast scanning calorimetry based on sensor chips for sample dimensions in the range of 100 microns allows measurements with heating and cooling rates which are by four orders higher than for conventional DSC. This method delivers new insight into the kinetics upon melting and solidification of these particles suggesting different kinetics of the transformations.