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US 2020/0211594 A1Published application
Aluminum alloy substrate for magnetic recording medium, substrate for magnetic recording medium, magnetic recording medium, hard disk drive
AssigneeShowa Denko K.K.
InventorsKoji YUKIMATSU, Hiroyuki MACHIDA, Sho YOKOYAMA
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Abstract
What is provided is an aluminum alloy substrate for a magnetic recording medium which has high rigidity and an excellent plating properties. The aluminum alloy substrate for a magnetic recording medium has a constitution in which coarse grains whose average grain size is within a range that exceeds 2 μm and is less than or equal to 20 μm are dispersed, the average number of coarse grains per area of 0.042 mm2 is 100 or more, and a surface roughness Ra is less than or equal to 0.2 μm.
Claims4
An aluminum alloy substrate for a magnetic recording medium
- wherein coarse grains whose average grain size is within a range that exceeds 2 μm and is less than or equal to 20 μm are dispersed,
- the average number of coarse grains per area of 0.042 mm2 is 100 or more, and a surface roughness Ra is less than or equal to 0.2 μm.
Dependencies are inferred from the claim text.