Precipitate Behavior and Microstructure Evolution of Γ’ Phase in Ni-Al Alloys with the Internal Elastic Strain

The microstructure evolution and precipitation behaviors of ordered γ (Ni3Al) phase in Ni-Al alloys were studied using the phase field dynamic model. Under the interactions of internal elastic strain, the γ phase morphology changes from the separated cuboidal to connected rectangle shape with the decrease of the aging temperature or the increase of the Al concentration. It also shows that the ordering of precipitates is finished instantly when they precipitate from the matrix phase. The γ phase volume fraction and the phase transformation velocity are affected by the aging temperature and composition of the Ni-Al alloys.