ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Studying microstructure evolution using phase-field method

Date: 12.04.2016
Time: 02:00
Place: Bundesanstalt für Materialforschung und –prüfung, Berlin, Germany

Reza Darvishi Kamachali

Microstructures often evolve by propagating fronts moving between domains. Whether they are grains of the same phase or new phases forming from the parent phase, the kinetics of propagation can be linearly linked with the thermodynamic driving forces across the interface once it occurs close to the equilibrium. The phasefield approach proposes a framework to express the kinetics of evolution in a continuous fashion facilitated by introducing diffuse interfaces between the domains. In this method the capillarity features of the interface is naturally incorporated while chemical and mechanical contributions can be easily incorporated. Here I briefly introduce these different aspects of phase-field and incorporation of chemical and mechanical effects. Two examples of grain growth and precipitation will be discussed in more details. The first example emphasizes large number of grains evolving at the same time such as in polycrystalline. The second example focus on the phase separation at the presence of chemical and mechanical mismatch between the two phases.

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