ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Kinetics of particle drag and pinning; phase-field modelling and simulation

Date: 14.09.2011
Place: EUROMAT 2011 - European Congress on Advanced Materials and Processes, Montpellier, France

Reza Darvishi Kamachali
Ingo Steinbach

Multi-phase field modeling and simulation has been applied to investigate the kinetics of grain boundary influenced by particle drag and pinning. For different grain boundaries of different velocities, three kinds of interactions have been characterized. Full pinning is found to occur below a certain driving for cenamely the pinning force. In creasing the driving force, pinning effect is less pronounced and the mobility converges to a constant value. The mobility in this case is below the theoretical value of an unloaded grain boundary and depends on fraction volume of particles. The large scale grain growth simulations also have been performed for spherical particles and the grain sized is tribution has been investigated.
The effect of shape of the particles has also been considered in the interaction with a flat interface. The results show the interfacial mobility is highly affected with the shape of particles. A linear dependency between V, mobility, and R-1, shape factor in verse, is found. This is consistent with the oretical formulation of shape-dependent pinning forces, driven by Ryumetal.

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