발간논문

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Vol.37, No.12, 1570 ~ 1578, 1999
Title
Rheological Behaviors of the Hypoeutectic A357 Al Alloy : Pseudoplasticity
고영진Young Jin Ko,윤의박Eui Pak Yoon,이재철Jae Chul Lee,이호인Ho In Lee
Abstract
Effects of various thermomechanical treatments on the microstructure and rheological behaviors of the semi-solid A357 alloy were studied using a concentric cylindrical viscometer. The size and morphology of primary solid particles during continuous cooling were influenced by shear rates and cooling rates. Faster cooling rate was observed to result finer microstructures. On the other hand, at a given cooling rate increased shear rates tend to force the primary particles agglomerate together. At a given volume fraction solid the viscosity of the slurry decreases with decreasing cooling rates and increasing shear rates. The strain rate sensitivity, which is the measure for the pseudoplastic behavior, was measured to be -1.3∼-1.6 within the fraction of solid range of 0.45∼0.65.
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