ALUMINUM ALLOY SHEET FOR MAGNETIC DISK AND PRODUCTION METHOD THEREFOR, AND MAGNETIC DISK USING SAID ALUMINUM ALLOY SHEET FOR MAGNETIC DISK

• Main Authors: HATAKEYAMA HIDEYUKI, YONEMITSU MAKOTO, FUJII YASUO, KITAWAKI KOTARO, SAKAMOTO RYO, TODA SADAYUKI
• Format: Patent
• Language: Chinese; English
• Published: 09.03.2021
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; METALLURGY; PHYSICS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

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 [mu]m are dispersed in a distribution density of 50 particles/mm , 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 [mu]m is 0particles/mm 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. 一种含有Fe：0.