The morphology evolution of the continuous precipitate Mg17Al12 in aging process was studiedusing KKS phase field model. In the model, the chemical free energy and chemical potential for the precipitatephase and matrix were obtained by using Thermo-Calc software and database. The effects of interfacial energyanisotropy were taken into account by introducing interface anisotropy function, and the effects of micro elasticstrain energy were introduced based on the theory of micro elastic strain energy formulated by Khachaturya. It isdemonstrated that the precipitate phase has a lath shape when only the interfacial energy anisotropy wasconsidered regardless of the micro elastic strain energy.The precipitate phase grows into a diamond shape whenonly the micro elastic strain energy was taken into account regardless of the interfacial energy anisotropy. Whenboth the effects of the interfacial energy anisotropy and the micro elastic strain energy were considered in thesimulation, the precipitate phase has a lath shape with lozenge ends,which is in agreement with experimental observations. The interfacial energy anisotropy affectsthe overall morphology of the precipitate, and combiningthe interfacial energy anisotropy and the micro elastic strain energy results in the lath shape with lozenge ends.
韩国民,韩志强,Alan A. Luo,Anil K. Sachdev,柳百成. Mg-Al合金Mg17Al12连续析出相形貌的相场模拟[J]. 金属学报, 2013, 49(3): 277-283.
HAN Guomin, HAN Zhiqiang, Alan A. Luo, Anil K. Sachdev, LIU Baicheng. PHASE FIELD SIMULATION ON MORPHOLOGY OF CONTINUOUS PRECIPITATE Mg17Al12IN Mg-Al ALLOY. Acta Metall Sin, 2013, 49(3): 277-283.