PHASE FIELD SIMULATION ON MORPHOLOGY OF CONTINUOUS PRECIPITATE Mg 17 Al 12 IN Mg-Al ALLOY

The morphology evolution of the continuous precipitate Mg 17 Al 12 in aging process was studied using KKS phase field model.In the model, the chemical free energy and chemical potential for the precipitate phase and matrix were obtained by using Thermo-Calc software and database.The effects of interfacial energy anisotropy were taken into account by introducing interface anisotropy function, and the effects of micro elastic strain energy were introduced based on the theory of micro elastic strain energy formulated by Khachaturya.It is demonstrated that the precipitate phase has a lath shape when only the interfacial energy anisotropy was considered regardless of the micro elastic strain energy.