Simulation of the coarsening behavior of Intermetallic precipitates in Ni75Alx V25-x alloys

The coarsening behavior of L12 and DQ22 in Ni75AlxV25-x (x, at.%) alloys including coherent strain was investigated using the microscopic phase-field model. The simulation results indicate that the shape transition and spatial correlation of L12 and D022 are caused by the morphological-dependent anisotropic elastic interactions in the system. The coarsening process of the particles is by means of neighbor particles impingement and aggregation into larger ones. For the strain-induced interactions between the precipitates, the LSW theory is altered for the coarsening behavior of L12 and D022. In addition, the simulation reveals that the growth and coarsening of D022 present two obvious stages at lower Al concentration regions and proceed simultaneously at high Al concentration regions. The growth and coarsening processes of L12 at the same regions is reverse to those of D022.