Explanation

In the solidification process of alloy, the general solute concentration in the first crystalline phase is low, and then the solute atoms will be enriched in the later crystalline phase. When the diffusion of solute atoms in the solid phase is not enough to homogenize it, solidification segregation will occur. When solute atoms are enriched between dendrites, it is called dendritic segregation; When solute atoms are enriched at grain boundary parallel to the growth direction of crystal, it is called segregation in grain boundary; When solute atoms are enriched at the cellular crystal junction parallel to the growth direction of the crystal, it is called cellular segregation. In addition, macro segregation at the ingot scale also occurs during solidification. solidification segregation belongs to nonequilibrium segregation, which can be eliminated or reduced by controlling the solidification process or homogenization annealing, but homogenization annealing will significantly increase production costs.

Classification