Abstract
ABSTRACT The formation of bonding between Al and Fe after the initial compound casting and during a heat treatment regime is investigated. No significant bonding was observed between the two metals after the initial casting. This observation was attributed to the presence of oxide films on the liquid Al and solid Fe alloys. The heat treatment of the cast part at 973 K (700°C) for at least 15 min is shown to cause the two alloys to bond to each other seamlessly. The cracks that formed on the Al oxide layer (due to the pouring stresses or the remelting of the alloy) is suggested to provide the necessary paths for the contact between the Al melt and the trapped atmosphere between the Al and Fe alloys, and the contact between the Al melt and the Fe surface. A detailed mechanism for the bonding is presented in this paper.
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