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Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 29: Microstructure and Phase Transformations

MM 29.6: Vortrag

Mittwoch, 3. April 2019, 16:15–16:30, H46

Connectivity evolution during coarsening of nanoporous gold via kinetic Monte Carlo simulations — •Yong Li1,2, Bao-Nam Dinh Ngô2, Jürgen Markmann1,2, and Jörg Weissmüller1,21Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany

This study is motivated by controversial findings on the change of network connectivity in nanoporous gold (NPG) during coarsening. We used on-lattice kinetic Monte Carlo simulations to study the evolution of size and ligament connectivity of spinodal-like initial microstructures during coarsening. Samples with different solid volume fractions were investigated at temperatures below and above their roughening transition temperature. Based on the simulation data, we discuss which measure for size is most fundamentally linked to the coarsening kinetics. We also show that the evolution of the connectivity depends sensibly on the solid fraction. This has ramifications for how mechanical properties of nanoporous metals vary when the ligament size is tuned through coarsening.

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