Abstract
To obtain an ingot of AZ91D magnesium alloy containing granular primary crystals of magnesium in the cast structure, we performed semisolid casting using an inclined cooling plate. In this casting process, molten metal is flown onto the inclined cooling plate to induce the primary magnesium crystal nucleation on the cooling plate. The molten metal containing the primary magnesium crystals which is flown onto the inclined cooling plate is cast in a preheated mold, where the crystals grow into grains. Factors which affect the cast structures are pouring temperature, the angle of the incline, and the length of the cooling plate. Under optimal conditions, an ingot of fine grains is obtained. Next, under optimal conditions of mold casting, we performed continuous casting along a horizontal direction, and we obtained a billet with a diameter of about 40 mm and a length of about 600 mm. All of the cast structures obtained were composed of fine grains.
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