Aluminum alloy foil

Abstract

An aluminum alloy foil is provided that is used as a material of a container and that achieves desired heat-resistant properties, enabling the container to withstand repeated use. The aluminum alloy foil is configured so as to: maintain a tensile strength of at least 120 N/mm 2 and have an elongation of at least 2.0% when subjected to softening treatment at 150° C. for a maximum of 240 minutes; maintain a tensile strength of at least 100 N/mm 2 and have an elongation of at least 3.0% when subjected to softening treatment at 180° C. for a maximum of 240 minutes; and maintain a tensile strength of at least 90 N/mm 2 and have an elongation of at least 3.0% when subjected to softening treatment at 200° C. for a maximum of 240 minutes.

1 . An aluminum alloy foil that:
 maintains a tensile strength of at least 120 N/mm 2  and has an elongation of at least 2.0% when subjected to softening treatment at 150° C. for a maximum of 240 minutes;   maintains a tensile strength of at least 100 N/mm 2  and has an elongation of at least 3.0% when subjected to softening treatment at 180° C. for a maximum of 240 minutes; and   maintains a tensile strength of at least 90 N/mm 2  and has an elongation of at least 3.0% when subjected to softening treatment at 200° C. for a maximum of 240 minutes.   
     
     
         2 . The aluminum alloy foil according to  claim 1 , comprising:
 0.3 to 3.0 mass % iron;   0.8 to 1.5 mass % silicon;   0.0001 to 0.011 mass % copper;   0.0001 to 0.6 mass % manganese;   0.0001 to 0.011 mass % magnesium;   0.001 to 0.011 mass % zinc;   0.005 to 0.5 mass % titanium; and   0.0001 to 0.3 mass % zirconium,   with a balance being aluminum and inevitable impurities.   
     
     
         3 . The aluminum alloy foil according to  claim 1 , wherein the aluminum alloy foil is subjected to intermediate annealing at a temperature of 300° C. to 400° C. during plate-rolling into a thickness of 0.5 to 1.2 mm after continuous casting. 
     
     
         4 . The aluminum alloy foil according to  claim 2 , having a thickness of 5 to 100 μm. 
     
     
         5 . An aluminum container comprising the aluminum alloy foil according to  claim 2 . 
     
     
         6 . A method for producing an aluminum alloy foil, the method comprising:
 preparing an aluminum alloy comprising: 0.3 to 3.0 mass % iron; 0.8 to 1.5 mass % silicon; 0.0001 to 0.011 mass % copper; 0.0001 to 0.6 mass % manganese; 0.0001 to 0.011 mass % magnesium; 0.001 to 0.011 mass % zinc; 0.005 to 0.5 mass % titanium; and 0.0001 to 0.3 mass % zirconium, with a balance being aluminum and inevitable impurities;   forming the aluminum alloy into an aluminum alloy piece through continuous casting;   plate-rolling the aluminum alloy piece into an aluminum alloy plate having a thickness of 0.5 to 1.2 mm;   carrying out intermediate annealing at a temperature of 300 to 400° C. during the plate-rolling step; and   foil-rolling the aluminum alloy plate into an aluminum alloy foil having a thickness of 5 to 100 μm.