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Inverse segregation for a unidirectional solidification of aluminum- copper alloys. (English) Zbl 0781.76085
Summary: A mathematical model has been developed to simulate the inverse segregation for a unidirectional solidification of Al-Cu alloys cooled from the bottom. It is found that the fluid flow of solute-rich liquid in the mushy zone caused by solidification shrinkage is the main driving force for the formation of inverse segregation. The predicted copper concentration in the solidified alloys is in good agreement with the published experimental data. Several interesting transient behaviors of solute redistribution in the mushy zone, which were not reported before, are also discussed.

MSC:
76T99 Multiphase and multicomponent flows
80A22 Stefan problems, phase changes, etc.
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