Atomic-scale computer simulation for the coarsening mechanism of the cubic alloy including coherent strain energy

The program of simulation for the evolution of microstructure during the precipitated process of binary cubic alloy including coherent strain energy is carried out based on the microscopic phase-field kinetic model. The precipitate's coarsening mechanism in Ni-based alloy with 20% solute (atomic fraction) under different coherent strain energies are studied. The results show that when the coherent strain energy is neglected, coarsening process follows LSW mechanism, which is decided only by the size of the precipitate; with increasing of coherent strain energy, coarsening process follows the mixed mechanism which is decided by both the size and orientation (mutual position) of the precipitates. When the coherent strain energy increases to some extent, coarsening process is decided only by the orientation of the particles, which grow up and coarsen preferentially along the elastically soft directions (<01>directions) and the particles lying out of the soft directions disappear.