Abstract
Aluminum alloy clad sheets are generally produced by hot roll bonding, but this conventional manufacturing process involves many steps. In the present study, clad strips were produced from molten alloys in one step and their microstructural characteristics were investigated. Two sets of twin roll casters were set in tandem vertically. The base strip (3003 aluminum alloy) was produced by the upper caster, and the strip was drawn into the roll-bite of the lower caster. The molten overlay material (4045 aluminum alloy) was poured, and the base strip was sandwiched between the two overlay strips. The interface between the base strip and the overlay strip was flat and no alloyed layer was observed. Remelting of the base strip did not occur, owing to the high production rate. Microstructural observation revealed that skin-formation type solidification of the overlay alloy took place from both the roll surface and the base strip surface.
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