Abstract
The paper experimentally investigated the effects of grain refinement on the rheological response of Al and hypoeutectic Al–Si alloys. Selected refiners included K 2TiF 6, K 2TiF 6 plus graphite and Al–5Ti–B. The apparent viscosity of semisolid Al alloys was measured during solidification. Samples at different solid fractions were quenched to observe the microstructure. It was found that grain refinement drastically lowered the apparent viscosity of Al–Si alloys. Among selected refiners, the effect of Al–5Ti–B was the best. The effect of K 2TiF 6 plus graphite was better than that of K 2TiF 6. Silicon contents in Al alloys affected the apparent viscosity. With increasing silicon content the apparent viscosity decreased, resulted from promotion of silicon to both refining effects of titanium and boron.
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