| 摘要 |
The present invention is: a magnetic disc aluminum alloy substrate characterized in being obtained from an aluminum alloy containing Mg: 4.5-10.0 mass% (written as % below), Be: 0.00001-0.00200%, Cu: 0.003-0.150%, Zn: 0.05-0.60%, Cr: 0.010-0.300%, Si: 0.060% or less, Fe: 0.060% or less, the balance being obtained from Al and unavoidable impurities, the content of Mg-based oxides being 50 ppm or less, and prior to applying plating pre-treatment, (IBe/Ibulk)×(CBe)≤0.1000% when the maximum optical emission intensity of Be in the surface depth direction using a glow discharge spectrometer is (IBe), the mean optical emission intensity of Be in the interior of the aluminum alloy base material is (Ibulk), and the Be content is (CBe)%; and a manufacturing method therefor. |
