Abstract
The formation condition of channel-type segregation was investigated systematically using unidirectionally solidified Al-Mg and Al-Mg-Cu alloys. In the Al-Mg alloys, the liquid density (ρL) in the solid-liquid region, which is directly related to the formation of channel-type seg-regation, decreases with the progress of solidification. Addition of copper offsets this density decrease. The effects of solidification rate, temperature gradient, composition, and inclination angle of specimens on the formation of channel-type segregation were studied in detail Channel-type segregation similar to that in steel ingots and directionally solidified superalloys appeared in these aluminum alloys below the critical solidification rate,Rc. The experimental results showed thatRc depended mainly on the thermal and solutal density change of the interdendritic liquid and the inclination angle of the solidification interface to the horizontal plane
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