Aluminum alloy material and production method therefor

Patent metadata

Field	Value
Publication number	US-2018347017-A1
Application number	US-201615777798-A
Country	US
Kind code	A1
Filing date	Nov 18, 2016
Priority date	Nov 20, 2015
Publication date	Dec 6, 2018
Grant date	—

Abstract

An aluminum alloy material as one aspect of the present disclosure has a chemical composition including: Zn: more than 6.5% (mass %, same applies hereafter) and 8.5% or less; Mg: 0.5% or more and 1.5% or less; Cu: 0.10% or less; Fe: 0.30% or less; Si: 0.30% or less; Mn: less than 0.05%; Cr: less than 0.05%; Zr: 0.05% or more and 0.10% or less; and Ti: 0.001% or more and 0.05% or less, a balance including Al and inevitable impurities. In the aluminum alloy material, a mass ratio of Zn to Mg (Zn/Mg) is 5 or more and 16 or less, and a metallographic structure includes an equigranular recrystallized structure.

First claim

1 . An aluminum alloy material having a chemical composition comprising:
Zn: more than 6.5% (mass %, same applies hereafter) and 8.5% or less; Mg: 0.5% or more and 1.5% or less; Cu: 0.10% or less; Fe: 0.30% or less; Si: 0.30% or less; Mn: less than 0.05%; Cr: less than 0.05%; Zr: 0.05% or more and 0.10% or less; and Ti: 0.001% or more and 0.05% or less, a balance comprising Al and inevitable impurities, wherein a mass ratio of Zn to Mg (Zn/Mg) is 5 or more and 16 or less, and wherein a metallographic structure comprises a recrystallized structure, which is equigranular.

2 . The aluminum alloy material according to claim 1 ,
wherein the recrystallized structure comprises crystal grains having an average grain diameter of 500 μm or less in a cross-section parallel to a direction orthogonal to a working direction, and a difference between a maximum value and a minimum value of grain diameters of the crystal grains is less than 300 μm.

3 . A production method for an aluminum alloy material, a metallographic structure of which comprises an equigranular recrystallized structure, the method comprising:
preparing an ingot having a chemical composition comprising:
Zn: more than 6.5% (mass %, same applies hereafter) and 8.5% or less;
Mg: 0.5% or more and 1.5% or less;
Cu: 0.10% or less;
Fe: 0.30% or less;
Si: 0.30% or less;
Mn: less than 0.05%;
Cr: less than 0.05%;
Zr: 0.05% or more and 0.10% or less; and
Ti: 0.001% or more and 0.05% or less,
a balance comprising Al and inevitable impurities,
wherein a mass ratio of Zn to Mg (Zn/Mg) is 5 or more and 16 or less; and
performing a homogenizing treatment in which the ingot is heated at a temperature higher than 540° C. and 580° C. or lower for 1 hour or longer and 24 hours or shorter.

Assignees

• Uacj Corp

Inventors

• Suzuki Taichi
• HATTA Hidenori
• Shakudo Shuhei

Classifications

• C22F1/053

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

• C22C21/10 Primary

  with zinc as the next major constituent · 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

• C22F1/04

  of aluminium or alloys based thereon · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title