公开(公告)号：US20170356073A1

公开(公告)日：2017-12-14

申请号：US15602839

申请日：2017-05-23

Applicant: UACJ CORPORATION

Inventor： Yuya SAWA ,  Minoru HAYASHI

IPC: C22F1/057 ,  C22F1/047 ,  C22C21/14 ,  C22C21/08 ,  C22C21/16

CPC classification number: C22F1/057 ,  C22C21/08 ,  C22C21/14 ,  C22C21/16 ,  C22F1/047

Abstract: The present invention relates to a high-strength aluminum alloy thick plate composed of an aluminum alloy including a prescribed quantity of Si, Mg, Ti, Fe, and the balance Al. The thick plate has a material structure in which an area ratio of Mg2Si having circle equivalent diameters of 3 μm or more in a plate thickness central portion is 0.45% or less; and an area ratio of Mg2Si having circle equivalent diameters of 3 μm or more in a region of 20 mm±1.5 mm from a plate surface in a plate thickness direction is 1.2 times or more and 3.0 times or less the area ratio of Mg2Si having circle equivalent diameters of 3 μm or more in the plate thickness central portion. The aluminum alloy thick plate has sufficient strength and good uniformity of strength in the plate thickness direction, and can be manufactured by cooling it after a solution treatment, so that suitable temperature difference occurs between a plate thickness central portion and a surface, and then performing a quenching treatment.

公开(公告)号：US20160351224A1

公开(公告)日：2016-12-01

申请号：US15117209

申请日：2015-09-24

Applicant: UACJ CORPORATION

Inventor： Kotaro KITAWAKI ,  Minoru HAYASHI ,  Yoshiji HASHIMOTO ,  Toshikazu HISAMOTO

IPC: G11B5/84 ,  C23C18/31 ,  C23F17/00 ,  G11B5/735 ,  C23C18/36 ,  B22D15/00 ,  B21B1/22 ,  C22F1/047 ,  C22C21/08

CPC classification number: G11B5/8404 ,  B21B1/22 ,  B21B2001/221 ,  B21B2001/225 ,  B21B2003/001 ,  B22D11/00 ,  B22D11/003 ,  B22D11/049 ,  B22D11/1206 ,  B22D15/00 ,  C22C21/06 ,  C22C21/08 ,  C22F1/00 ,  C22F1/047 ,  C23C18/1651 ,  C23C18/31 ,  C23C18/36 ,  C23C18/54 ,  C23F17/00 ,  G11B5/735

Abstract: An aluminum alloy plate for a magnetic disk substrate with a flat and smooth ground surface, a production method by which the aluminum alloy plate can be produced at low cost and a magnetic disk are shown. An aluminum alloy plate for a magnetic disk substrate which comprises an aluminum alloy containing Mg: 3.0 to 8.0 mass % (hereinafter %), Cu: 0.005 to 0.150%, Zn: 0.05 to 0.60%, Cr: 0.010 to 0.300%, Fe: 0.001 to 0.030%, Si: 0.001 to 0.030%, (Ti+V+Zr): 0.0010 to 0.0100%, B: 0.0001 to 0.0010% with a balance being Al and inevitable impurities, wherein the density of a Ti—V—B—Zr-based inclusion having a maximum diameter exceeding 5 μm is 0 piece/6000 mm2 and the density of a Ti—V—B—Zr-based inclusion having a maximum diameter of 3 to 5 μm is 1 piece/6000 mm2 or less; a production method thereof; and a method for producing a magnetic disk.

Abstract translation: 一种用于具有平坦且光滑的地面的磁盘基板的铝合金板，显示了可以低成本制造铝合金板的制造方法和磁盘。 一种含有Mg：3.0〜8.0质量％（以下％），Cu：0.005〜0.150％，Zn：0.05〜0.60％，Cr：0.010〜0.300％的Fe合金的铝合金板，Fe： 0.001〜0.030％，Si：0.001〜0.030％，（Ti + V + Zr）：0.0010〜0.0100％，B：0.0001〜0.0010％，余量为Al和不可避免的杂质，Ti-V-B 最大直径超过5μm的Zr基夹杂物为0个/ 6000mm 2，最大直径为3〜5μm的Ti-V-B-Zr系夹杂物的密度为1个/ 6000mm 2以下 ; 其制造方法; 以及制造磁盘的方法。