Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 14: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Electro- and mechno-chemical coupling

MM 14.2: Vortrag

Montag, 20. März 2017, 16:00–16:15, BAR 205

Curvature induced stress and phase-boundary diffusion — •Raphael Schiedung, Reza Kamachali, Ingo Stainbach, and Fathollah Varnik — Ruhr Universität Bochum, Interdisciplinary Centre For Advanced Materials Simulations, Bochum, Deutschland

The multi-phase-field approach is generalized to treat diffusion, driven by mean curvature, parallel to surfaces between a condensed phase and its vapor as well as diffusion parallel to boundaries between condensed phases, ’phase-boundary diffusion’. Additionally, we present a treatment of surface-tension/energy for elastic bodies within the multi phase-field framework. The model is validated against the Young-Laplace law for the pressure gradient across the interface of spherical bodies and the prediction of Neumann’s triangle relation for the force equilibrium at triple junctions. It is applied to thermal grooving and to the solid state sintering process of two spheres.