ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREFOR, AND MAGNETIC DISK USING THE ALUMINUM ALLOY SUBSTRATE FOR MAGNETIC DISK

• Main Authors: HATAKEYAMA HIDEYUKI, YONEMITSU MAKOTO, KITAWAKI KOTARO, IMAKAWA KIMIE, NAKAYAMA KEN
• Format: Patent
• Language: English; Japanese
• Published: 26.03.2020
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PHYSICS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide an aluminum alloy substrate for magnetic disk having good flattering property and a manufacturing method therefor, and a magnetic disk using the aluminum alloy substrate for magnetic disk.SOLUTION: There are provided an aluminum alloy substrate for magnetic disk consisting of an aluminum alloy containing one or more kind selected from a group consisting of Fe:0.05 to 3.00 mass% (hereafter "%"), Mn:0.05 to 3.00%, Si:0.05 to 18.00%, Ni:0.05 to 3.00%, Cr:0.05 to 3.00% and Zr:0.05 to 3.00%, and the balance Al with inevitable impurities, and having Young modulus of 0° direction, 45° direction and 90° direction from a rolling direction of the substrate of 67 GPa or more, a manufacturing method therefor, and a magnetic disk using the same.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及びその製造方法、ならびに、当該磁気ディスク用アルミニウム合金基板を用いた磁気ディスクを提供する。【解決手段】Ｆｅ：０．０５〜３．００ｍａｓｓ％（以下、「％」）、Ｍｎ：０．０５〜３．００％、Ｓｉ：０．０５〜１８．００％、Ｎｉ：０．０５〜３．００％、Ｃｒ：０．０５〜３．００％及びＺｒ：０．０５〜３．００％からなる群から選択される１種又は２種以上を含有し、残部Ａｌ及び不可避不純物からなるアルミニウム合金からなり、基板の圧延方向から０°方向、４５°方向及び９０°方向のヤング率が６７ＧＰａ以上であることを特徴とする磁気ディスク用アルミニウム合金基板及びその製造方法、ならびに、これを用いた磁気ディスク。【選択図】図１