The phase field modeling of L →β directional solidification in Ti-43Al binary alloy was established by coupling the thermodynamic databases to WBM model.Based on the model

the microstructure evolution in solidification process was successfully simulated.The influences of phase field parameters and solidification parameters on the interfacial morphology were analyzed.The simulated results show that

with the decrease of the anisotropy coefficient

the tip growth rate is decreased and branch growth is easier

which is in favor of formation of cellular structures.The grain growth is transformed from shallow cell to deep cell as a result of easy enrichment of solute at groove of cell grain with the interface thickness decrease.In addition

with the increase of the temperature gradient

the interfacial microstructure evolution is transformed from deep cell to shallow cell

then to planar interface.