Numerical simulation of multi-grain structure and prediction of microsegregation in binary Ni–Cu alloy under isothermal conditions

The multi-grain structure and microsegregation during solidification of the binary alloy Ni–Cu under isothermal condition are simulated and predicted by use of the phase-field method. Two concentrations are selected as the computational initial conditions. The results indicate that the supersaturation plays a very important role in microsegregation. The comparison shows that the larger the supersaturation, the higher the degree of microsegregation. Furthermore, the larger the supersaturation, the coarser the dendrite structure and the higher the velocity of dendritic growth. The dendritic evolution starting from different initial conditions is given, and the dynamic reasons of this are also analyzed and discussed.