Title:
ALUMINUM ALLOY SHEET FOR MAGNETIC DISK AND PRODUCTION METHOD THEREFOR, AND MAGNETIC DISK USING SAID ALUMINUM ALLOY SHEET FOR MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2020/022380
Kind Code:
A1
Abstract:
Disclosed are: an aluminum alloy sheet for a magnetic disk, the sheet comprising 0.1-3.0 mass% (hereinafter, simply represented as "%") of Fe, 0.1-3.0% of Mn, 0.003-1.000% of Cu, and 0.005-1.000% of Zn, wherein, in a region (A) covering not more than 25% of the sheet thickness from the sheet-thickness central plane toward both surfaces of the sheet, second-phase particles in which the largest length therein is 100-300 μm are dispersed in a distribution density of 50 particles/mm2, in a region (C) obtained by subtracting the region (A) from a region (B) covering not more than 50% of the sheet thickness from the sheet-thickness central plane toward both surfaces of the sheet, the distribution density of the second-phase particles in which the largest length therein is 100-300 μm is 0 particles/mm2 and the amount of Mn present in the form of a solid solution is at least 0.03%; a production method for said aluminum alloy sheet for a magnetic disk; and a magnetic disk using said aluminum alloy sheet.
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Inventors:
KITAWAKI KOTARO (JP)
YONEMITSU MAKOTO (JP)
HATAKEYAMA HIDEYUKI (JP)
TODA SADAYUKI (JP)
SAKAMOTO RYO (JP)
FUJII YASUO (JP)
YONEMITSU MAKOTO (JP)
HATAKEYAMA HIDEYUKI (JP)
TODA SADAYUKI (JP)
SAKAMOTO RYO (JP)
FUJII YASUO (JP)
Application Number:
PCT/JP2019/029023
Publication Date:
January 30, 2020
Filing Date:
July 24, 2019
Export Citation:
Assignee:
UACJ CORP (JP)
FURUKAWA ELECTRIC CO LTD (JP)
FURUKAWA ELECTRIC CO LTD (JP)
International Classes:
C22C21/00; G11B5/73; C22F1/00; C22F1/04; G11B5/84
Foreign References:
| JPH04341535A | 1992-11-27 | |||
| JP2009256782A | 2009-11-05 | |||
| JP2018081732A | 2018-05-24 |
Attorney, Agent or Firm:
KIMURA MITSURU (JP)
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