UNIDIRECTIONAL INFILTRATION AND SOLIDIFICATION REMELTING OF AL-CU ALLOY/

Unidirectional, adiabatic infiltration, and solidification/remelting o f Al-4.5 wt% Cu alloy in a porous preform is modeled numerically, The model formulation is derived from the Fundamental conservation laws. T he moving infiltration and remelting fronts are dealt with by the Land au transformation. The transformed governing equations are solved nume rically. The solute, temperature, and solid volume fraction profiles a re presented for representative parameters, The numerical predictions agree well with previously reported experimental measurements and with the analytical similarity solution, It is observed that the unidirect ional infiltration and heat transfer do display the similarity behavio r, and the macrosegregation in the casting is strongly dependent on th e initial preform temperature, the superheat of inlet metal-matrix, an d the applied pressure.