Al-Cu合金鋳塊の表面層組織に及ぼす銅含有量の影響

概要

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The effect of solute content on predendrites was investigated using aluminum-copper alloy ingots. Molten aluminum-copper alloy was cast into an unidirectional solidification mold. The copper content in aluminum-copper alloy was varied between 0 and 5.7 per cent. The heat transfer coefficients at the ingot-chill block interface calculated from thermal balance equation increased with increasing copper contents. Discs and predendrites were observed microscopically in the surface layer of ingots. In the case of pure aluminum ingot, cellulal structures had grown from the disc, whereas in the case of aluminum-copper alloy ingots, dendritic structures had grown from the disc. The number of the disc increased with increasing copper content, but the size of the disc decreased. The copper concentration in the discs was lower than the outer portion of the discs. The ratio of the minimum copper concentration at the center of the disc to the average copper concentration of ingot (effective distribution coefficient) decreased with the increase of copper content in ingots.
東海大学の論文