US 12,031,198 B2
Aluminum alloy foil
Takashi Suzuki, Susono (JP)
Assigned to MA Aluminum Corporation, Minato-ku (JP)
Appl. No. 18/258,789
Filed by MA Aluminum Corporation, Minato-ku (JP)
PCT Filed Dec. 21, 2021, PCT No. PCT/JP2021/047245
§ 371(c)(1), (2) Date Jun. 21, 2023,
PCT Pub. No. WO2022/138620, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-216370 (JP), filed on Dec. 25, 2020; and application No. 2021-174502 (JP), filed on Oct. 26, 2021.
Prior Publication US 2024/0043968 A1, Feb. 8, 2024
Int. Cl. C22C 21/00 (2006.01); C22F 1/04 (2006.01)
CPC C22C 21/00 (2013.01) [C22F 1/04 (2013.01)] 5 Claims
 
1. An aluminum alloy foil having a composition comprising:
Fe of 1.0% by mass or more and 1.8% by mass or less;
Si of 0.01% by mass or more and 0.08% by mass or less;
Cu of 0.005% by mass or more and 0.05% by miss or less;
Mn of more than 0% and 0.01% by mass or less; and
Al,
wherein, in a crystal orientation analysis per unit area by electron backscatter diffraction (EBSD), a ratio (HAGBs/LAGBs) of a length of high angle grain boundaries (HAGBs) having an orientation difference of 15° or more to a length of low angle grain boundaries (LAGBs) having an orientation difference of 2° or more and less than 15° is more than 2.0,
a Cu orientation density is 40 or less and an R orientation density is 30 or less as a texture,
a difference (Ra20−Ra0) between an initial surface roughness Ra0 and a surface roughness Ra20 when a strain of the aluminum alloy foil is 20% in a tensile test is 0.25 μm or less, and
a thickness of the aluminum alloy foil is 10 μm or more and 80 μm or less.