Abstract
Binary aluminum alloys (Al-2.0wt%Si, Al-0.4wt%Cr, Al-0.2wt%Fe and Al-1.7wt%Mn) were solidified unidirectionally and quenched into oil to study the solid-liquid interface. Following results were obtained:(1) The curvature of the planar interface of the Al-Si alloy is larger than that of the other alloys. This suggests that the interface of the Al-Si alloy has different characteristics from that of the other alloys. In the Al-Cr alloy, there is a banded zone which shows a trace of the movement of the interface during quenching.(2) The mean diffusion coefficients of solutes in the liquid have the tendencies identical to those in the solid, except Mn which diffuses rapidly in the liquid. The calculated diffusion coefficients are 9.7 × 10-5cm2/sec in the Al-Si alloy, 2.7 × 10-5cm2/sec in the Al-Mn alloy and 1.3 × 10-5cm2/sec in the Al-Fe alloy.(3) The solute distribution coefficients at the solid-liquid interface are close to the equilibrium coefficients.
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