Abstract
Al-4%Cu and Al-2 and 5%Si alloys were solidified under high pressures up to 2000kgf/cm2. The eutectic liquid having low freezing point is condensed in the terminal freezing region and causes anomalously devedoped segregation in the shape of a withered bush. Segregation occurs noticeably when the compressing direction is perpendicular to the preferential growth direction of columnar crystals. Segregation hardly occurs when compression and prefered growth are in the same direction. Gravity castings solidified under normal pressure have more of eutectic phase near the side surface in the form of inverse segregation. The residual liquid eutectic in the solidifying castings under high pressure is, on the other hand, squeezed into the central and upper region of the castings where the liquid with large solidification contraction remains resulting in normal segregation extremely accelerated.
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