Abstract
In this work, influence of mechanical stirring on semi-solid state of Al-5mass%Si alloy prepared from elemental powders is examined to obtain an information about the semi-solid diecasting method using the powder. Viscosity of the slurry containing volume fraction of solid phase less than 40% is lower, but it remarkably increases when the volume fraction of the solid increased to more than 40%. In the case of low stirring speed, sizes of solid aluminum phase and eutectic silicon phase grow. The specimen solidified from the unstirred slurry has many blow holes, but they are disappeared by the stirring of low speed. As the stirring speed increased, the particle of aluminum solid in the slurry become to globular form and the grain size of silicon phase in the eutectic matrix decreases.
