Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 16: Microstructure and Phase Transformations I

MM 16.3: Vortrag

Montag, 26. März 2012, 16:15–16:30, H 1029

Melting point depression of embedded Bi nano particles in Zn synthesized by rapid solidification — •Tae-Eun Song, Joachim Bokeloh, Martin Peterlechner, and Gerhard Wilde — Westfälische Wilhelms-Universität,Institute für Materialphysik, Wilhelm-klemm-straße 10 D-48149 Münster, Germany

The melting point depression of embedded Bi nano particles in a Zn matrix synthesized by rapid solidification was analyzed using Differential scanning calorimetry (DSC), Scanning electron microscope (SEM) and Transmission electron microscopy (TEM). SEM and TEM results reveal the Bi particle size distribution of the as prepared state and after annealing at the relevant temperature. DSC results reveal the embedded Bi particles are solidified at two different undercooling levels. Some Bi particles are solidified at a small undercooling with a number of exothermic peaks. Other Bi particles are solidified with a broad exothermic peak at a larger undercooling level. During repeated heating and cooling through the early melting peak, the enthalpy for solidification gradually decreases. The possible explanations based on thermodynamics or based on coarsening kinetics will be discussed.