ALUMINUM ALLOY COMPOSITION AND METHOD OF MANUFACTURE

摘要

The invention relates to a recyclable aluminum foil. The foil is made of an alloy containing 0.2 %-0.5 % Si, 0.4 %-0.8 % Fe, 0.1 %-0.3 % Cu, and 0.05 %-0.3 % Mn by weight with the balance aluminum and incidental impurities. The foil contains at least about 2 % by weight of strengthening particulates and has at least about 0.1 % by weight of the copper and/or manganese retained in solid solution. The invention also relates to a method of manufacturing a sheet of aluminum based on an alloy which involves continuously casting an alloy of the above composition to form a sheet of alloy, coiling said sheet of alloy, cold rolling the sheet of alloy, interannealing the alloy after a first pass of the cold rolling; and further cold rolling the alloy to a final desired gauge. The foil, which is suitable for household use, has improved strength due to a larger quantity of dispersoids fortified by elements in solid solution, and can be recycled with other alloy scrap.