Aluminum alloy sheet for magnetic disk and production method therefor, and magnetic disk using said aluminum alloy sheet for magnetic disk

An aluminum alloy sheet for a magnetic disk, the aluminum alloy sheet comprising:

• an aluminum alloy comprising 0.10 to 3.00 mass % of Fe, 0.1 to 3.0 mass % of Mn, 0.003 to 1.000 mass % of Cu, 0.005 to 1.000 mass % of Zn, and optionally one or more elements selected from a group comprising 0.1 to 0.4 mass % of Si, 0.1 to 3.0 mass % of Ni, 0.1 to 6.0 mass % of Mg, 0.01 to 1.00 mass % of Cr, and 0.01 to 1.00 mass % of Zr, with a balance of Al and unavoidable impurities, wherein
• second phase particles having a maximum diameter of 100 μm or more and 300 μm or less are dispersed at a distribution density of 50 particles/mm2 or less in a region (A) occupying 25% or less of a sheet thickness from a sheet thickness center plane to opposite surfaces of the sheet,
• second phase particles having a maximum diameter of 100 μm or more and 300 μm or less are 0 particles/mm2 in a region (C) excluding the region (A) from a region (B) occupying 50% or less of the sheet thickness from the sheet thickness center plane to the opposite surfaces of the sheet, and
• an amount of Mn solid solution is 0.03 mass % or more.