Aluminum alloy sheet and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10041154-B2
Application number	US-201214234770-A
Country	US
Kind code	B2
Filing date	Jul 10, 2012
Priority date	Jul 25, 2011
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

An aluminum alloy sheet includes an aluminum alloy substrate having a composition containing, by mass percentage, 3.0 to 4.0% of magnesium, 0.2 to 0.4% of manganese, 0.1 to 0.5% of iron, not less than 0.03% but less than 0.10% of copper, and less than 0.20% of silicon, with the remainder being aluminum and unavoidable impurities. A peak concentration of a copper concentration distribution in a thickness direction in a region at a depth of 15 nm to 200 nm from the surface of the aluminum alloy substrate is equal to or more than 0.15%, and the aluminum alloy substrate has a recrystallized structure with an average grain size of 15 μm or less.

First claim

The invention claimed is:

1. An aluminum alloy sheet, comprising:
an aluminum alloy substrate having a composition containing, by mass percentage, 3.0 to 4.0% of magnesium, 0.3 to 0.4% of manganese, 0.1 to 0.5% of iron, not less than 0.03% but less than 0.05% of copper, less than 0.20% of silicon, 0.005 to 0.1% titanium, and 0.0005 to 0.01% boron, with a remainder being aluminum and unavoidable impurities,
wherein a peak concentration of a copper concentration distribution in a thickness direction in a region at a depth of 15 nm to 200 nm from a surface of the aluminum alloy substrate is equal to or more than 0.15% by mass, and
wherein the aluminum alloy substrate has a recrystallized structure with an average grain size of 15 μm or less.

2. The aluminum alloy sheet according to claim 1 , wherein the aluminum alloy substrate has a tensile strength of 240 MPa or more.

Assignees

• Hirayama Tomoyuki
• Zhao Pizhi
• Handa Takeshi
• Anami Toshiya
• Nagaishi Yusuke
• Itakura Koji
• Miyagawa Hirokazu
• Hattori Tsutomu
• Yoshizawa Shigenori
• Yoshizawa Akio
• Nippon Light Metal Co
• Nissan Motor

Inventors

• Hirayama Tomoyuki
• Zhao Pizhi
• Handa Takeshi
• Anami Toshiya
• Nagaishi Yusuke
• Itakura Koji
• Miyagawa Hirokazu
• Hattori Tsutomu
• Yoshizawa Shigenori
• Yoshizawa Akio

Classifications

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title

• B21B2003/001

  Aluminium or its alloys · CPC title

• C22F1/00

  Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title

• B22D11/003

  Aluminium alloys · CPC title

• C22C21/06

  with magnesium as the next major constituent · CPC title