Title:
ALUMINUM ALLOY SHEET FOR MAGNETIC DISK, ALUMINUM ALLOY BLANK FOR MAGNETIC DISK, AND ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK
Document Type and Number:
Japanese Patent JP2020114944
Kind Code:
A
Abstract:
To provide an aluminum alloy sheet for a magnetic disk, an aluminum alloy blank for a magnetic disk, and an aluminum alloy substrate for a magnetic disk, having excellent rigidity and excellent smoothness of an electroless Ni-P plating film formed on the surface.SOLUTION: An Al alloy sheet for a magnetic disk according to the present invention contains: Mg: 3.00 mass% or less and Si: 1.00 mass% or less; it contains at least one of Fe: 5.0 mass% or less, Mn: 5.0 mass% or less, and Ni: 5.0 mass% or less, the total amount thereof being 8.0 mass% or less; and it contains at least one of Cr: 2.0 mass% or less, Ti: 0.5 mass% or less, and Zr: 2.0 mass% or less, the total amount thereof being 2.0 mass% or less; the balance consists of Al and unavoidable impurities; in the unavoidable impurities, individual amounts of V, B, Na, K, Ca, and Sr being 0.005% or less, and the total amount thereof 0.015% or less; the area ratio of the surface occupied by intermetallic compounds is 5-40%; and the total area ratio of simple Si and Mg-Si intermetallic compound is 1% or less.SELECTED DRAWING: None
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Inventors:
KOMURO HIDEYUKI
UMEDA HIDETOSHI
UMEDA HIDETOSHI
Application Number:
JP2020058838A
Publication Date:
July 30, 2020
Filing Date:
March 27, 2020
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
C22C21/00; C22C21/06; C22C21/10; C22C21/12; G11B5/73
Domestic Patent References:
| JP6684139B2 | 2020-04-22 | |||
| JP2017186597A | 2017-10-12 | |||
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| JPS62230948A | 1987-10-09 | |||
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Attorney, Agent or Firm:
Isono International Patent and Trademark Office