Segregation of Promoters During Solidification Processes

Proportional segregation 1. Occur at the initial stage of solidification and originated from different densities 

Positive segregation 2. High concentration at the beginning of solidification and low concentration at the last. 

Reverse segregation 3. Contrary to the solute distribution of positive segregation, the originations of shrinkage that the high concentration liquid of solute in the center is squeezed to the surface when they are transmitted through the channel of the dendrite. 

Channel segregation 4. The channel segregation is caused by the faot that flow of the liquid phase has more solutes with low melting point among the dendrite due to the contraction and density difference. 

Zonal segregation 5. The composition changes in a zonary area parallel to the solid—liquid boundary, which is caused by the change in the growth rates. 

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