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Phase field simulations of microstructure evolution during solidification of magnesium-based alloys
A multiphase-field model for multicomponent alloys is adapted to simulate microstructure evolution during the solidification of magnesium-based alloys. The general aim of these simulations is to derive microstructure quality criteria to assist the computational design of new commercial cast alloys. The model is based on quasi-equilibrium calculations using Calphad databases to consider the complex free energies of multicomponent alloys. A local extrapolation rule is deduced to reduce the computational effort. Hexagonal anisotropy functions are integrated to describe the growth of the hexagonal closed-packed magnesium phase. Applications to the commercial Mg-Al-Zn based alloy AZ31 are presented describing directional as well as equiaxed dendritic growth.