Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 3: Microstructures and Phase Transformations: Metals & Alloys

MM 3.2: Vortrag

Montag, 5. September 2022, 10:30–10:45, H45

Crystal nucleation in undercooled Cu-Ge melts — •Manoel W. da Silva Pinto, Martin Peterlechner, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

Experimental calorimetric data obtained by differential thermal analysis on the nucleation of undercooled Cu-Ge melts are presented. Deep undercooling levels have been reached throughout the entire composition range of this binary alloy in an experimental setup using an inorganic glass as an embedding medium. The heating and cooling cycles are statistically analyzed and lead to quantitatively determining nucleation rates independent of a specific nucleation kinetics model. Parameters of the classical nucleation theory, such as the kinetic pre-factor and nucleation work, are extracted. We further discuss the data using different solution models for the alloy melts and consider their impact on nucleation kinetics. Thus, the nucleation kinetics parameters for the binary alloy system have been determined as a function of composition throughout the entire composition range and allow comparison with simplified models for concentration-dependent nucleation kinetics.