US 11,721,361 B2
Aluminum alloy substrate for magnetic disks, method for producing same, and magnetic disk using said aluminum alloy substrate for magnetic disks
Kotaro Kitawaki, Tokyo (JP); Takuya Murata, Tokyo (JP); Makoto Yonemitsu, Tokyo (JP); Yu Matsui, Tokyo (JP); Yasuo Fujii, Tokyo (JP); Ryo Sakamoto, Tokyo (JP); Takashi Nakayama, Tokyo (JP); and Wataru Kumagai, Tokyo (JP)
Assigned to UACJ CORPORATION, Tokyo (JP); and FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Appl. No. 16/611,770
Filed by UACJ CORPORATION, Tokyo (JP); and FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
PCT Filed Apr. 9, 2018, PCT No. PCT/JP2018/014894
§ 371(c)(1), (2) Date Nov. 7, 2019,
PCT Pub. No. WO2018/207523, PCT Pub. Date Nov. 15, 2018.
Claims priority of application No. 2017-095115 (JP), filed on May 12, 2017.
Prior Publication US 2021/0151077 A1, May 20, 2021
Int. Cl. G11B 5/73 (2006.01); C22C 21/06 (2006.01); C22C 21/12 (2006.01); C22F 1/047 (2006.01); C22C 21/10 (2006.01); C22F 1/053 (2006.01); C22F 1/057 (2006.01)
CPC G11B 5/73913 (2019.05) [C22C 21/06 (2013.01); C22C 21/10 (2013.01); C22C 21/12 (2013.01); C22F 1/047 (2013.01); C22F 1/053 (2013.01); C22F 1/057 (2013.01); G11B 5/73919 (2019.05)] 14 Claims
OG exemplary drawing
 
1. An aluminum alloy substrate for a magnetic disk, the aluminum alloy substrate comprising an aluminum alloy comprising 0.4 to 3.0 mass % of Fe, preferably one or more selected from a group consisting of 0.1 to 0.4 mass % of Si and 0.01 to 1.00 mass % of Zr, and a balance of Al and unavoidable impurities,
wherein second phase particles having a longest diameter of 0.5 μm or more and less than 2.0 μm are dispersed at a distribution density of 5000 particles/mm2 or more.