Inverse Segregation in Aluminum-Copper Alloys.

Segregation which occurs in slowly cooled castings and in the direction indicated by the equilibrium diagram is called "normal segregation". The first crystals to separate from the molten alloy during solidification are rich in the higher melting point alloy and occupy a position close to the mold face. As the solidification proceeds the growing dendrites push before them the residual liquid which is becoming continually enriched in the lower melting point alloy (usually the alloy of high solute concentration). [...