Method of making aluminum alloy foil and product therefrom

摘要

A method of making an aluminum foil product from an aluminum-silicon-iron aluminum alloy comprises casting the alloy into a slab, preferably by twin roll casting, cold rolling the alloy to an intermediate gauge and reroll annealing the intermediate gauge material. The reroll annealed material is then cold rolled to a final foil gauge followed by a final recrystallizing annealing. The aluminum alloy has a controlled amount of silicon and iron such that the silicon is equal to or greater than the iron amount and the reroll anneal temperature is 800 DEG F. (427 DEG C.) or less. The combination of the controlled amounts of silicon and iron and the lower reroll anneal temperature results in an improved foil product in terms of finer grain size and higher elongation which is also less costly to produce.