US 12,243,570 B2
Aluminum alloy substrate for magnetic disc and magnetic disc
Kotaro Kitawaki, Tokyo (JP); Hideyuki Hatakeyama, Tokyo (JP); Wataru Kumagai, Tokyo (JP); and Ryo Sakamoto, Tokyo (JP)
Assigned to Furukawa Electric Co., Ltd., Tokyo (JP)
Filed by UACJ CORPORATION, Tokyo (JP); and FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed on Jun. 14, 2023, as Appl. No. 18/334,651.
Application 18/334,651 is a continuation of application No. PCT/JP2021/045825, filed on Dec. 13, 2021.
Claims priority of application No. 2020-207707 (JP), filed on Dec. 15, 2020.
Prior Publication US 2024/0021213 A1, Jan. 18, 2024
Int. Cl. G11B 5/73 (2006.01)
CPC G11B 5/73919 (2019.05) 7 Claims
 
1. An aluminum alloy substrate for a magnetic disc made of an aluminum alloy, comprising Fe: 0.10 mass % or more and 1.80 mass % or less, Mn: 0.10 mass % or more and 0.70 mass % or less, Ni: 0.10 mass % more and 2.50 mass % or less, Si: 2.50 mass % or less, Cu: 0.003 mass % or more and 1.00 mass % or less, Zn: 0.003 more and 0.48 mass % or less and Mg: 1.00 to 3.50 mass %, wherein Fe, Mn and Ni has a total content that is 1.60 to 4.50 mass % and a mass ratio of Cu/Zn is 0.01 to 0.35 or 6.00 to 50.00, with a balance being Al and inevitable impurities.