ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISKS AND MAGNETIC DISK

• Main Authors: HATAKEYAMA HIDEYUKI, KITAWAKI KOTARO, SAKAMOTO RYO, KUMAGAI KO
• Format: Patent
• Language: English; Japanese
• Published: 27.06.2022
• 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

To provide an aluminum alloy substrate for magnetic disks having excellent fluttering properties.SOLUTION: An aluminum alloy substrate for magnetic disks comprises an aluminum alloy containing 1.80 mass% or less of Fe, 0.70 mass% or less of Mn, 2.50 mass% or less of Ni, 2.50 mass% or less of Si, 1.00 mass% or less of Cu, 0.48 mass% or less of Zn, and 1.00-3.50 mass% of Mg, with the remainder consisting of Al and unavoidable impurities, where the total content of Fe, Mn, and Ni is 1.60-4.50 mass%, and the mass ratio of Cu/Zn is 0.01-0.35 or 6.00-50.00.SELECTED DRAWING: Figure 1 【課題】良好なフラッタリング特性を有する磁気ディスク用アルミニウム合金基板を提供する。【解決手段】磁気ディスク用アルミニウム合金基板は、Ｆｅ：１．８０ｍａｓｓ％以下、Ｍｎ：０．７０ｍａｓｓ％以下、Ｎｉ：２．５０ｍａｓｓ％以下、Ｓｉ：２．５０ｍａｓｓ％以下、Ｃｕ：１．００ｍａｓｓ％以下、Ｚｎ：０．４８ｍａｓｓ％以下、Ｍｇ：１．００～３．５０ｍａｓｓ％、を含有し、ＦｅとＭｎとＮｉの合計含有量が１．６０～４．５０ｍａｓｓ％であり、Ｃｕ／Ｚｎの質量比が０．０１～０．３５、又は、６．００～５０．００であり、残部Ａｌ及び不可避的不純物からなるアルミニウム合金からなる。【選択図】図１