Phase field modeling of directional solidification of a binary alloy at high velocities

Some computational results on directional solidification of a binary alloy obtained by using the phase field model are reported. Frozen temperature approximation is adopted to simplify the modeling. The onset of morphological instability, the pattern evolution and the solute redistribution are shown. The cell to planar interface transition is modeled near the high velocity absolute stability condition. The cell spacings, tip temperatures and solute partitioning coefficients at different velocities are calculated. The solute trapping is also observed.