Al-4.5mass%Cu合金鋳塊のプリデンドライト組織と鋳型表面形状の関係

概要

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Al-4.5 mass % Cu alloys were melted at 990K and cast into a unidirectional solidification mold. The surface of a chill block was finished with various kinds of emery papers. Heat transfer coefficients and heat flux at the molten metal-chill block interface were calculated by a thermal balance equation. The size of chill crystals decreased with the value of surface rugosity of the chill block. For the value of surface rugosity less than about 1.2μm, the crystal was not affected by the surface morphology of the chill block, The heat transfer coefficient and heat flux decreased with the increasing a value of surface rugosity from 1.2μm to 6.7μm. Concerning of the value of surface rugosity less than l.2μm, the heat transfer coefficient and the heat flux were constant. Discs were formed as a result of nucleation in the liquid in contact with the surface of the chill block. The number of the discs decreased with the increasing the value of surface rugosity from 1.2μm to 6.7μm. In the case of a value of surface rugosity below 1.2μm, the number of the discs were constant. It found out that the chill crystals consisted of discs and predendrites.
東海大学の論文