Die-cast aluminum alloy and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-12448669-B2
Application number	US-202017600267-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Apr 12, 2019
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A die-cast aluminum alloy and a preparation method and use thereof are disclosed. Based on the total mass of the die-cast aluminum alloy, the die-cast aluminum alloy includes: 4-9 wt % of Mg; 1.6-2.8 wt % of Si; 1.1-2 wt % of Zn; wt % of Mn; 0.1-0.3 wt % of Ti; 0.009-0.05 wt % of Be; the balance of Al; and less than 0.2 wt % of inevitable impurities.

First claim

What is claimed is:

1. A die-cast aluminum alloy, consisting of:
4-9 wt % of Mg;
1.6-2.8 wt % of Si;
1.1-2 wt % of Zn;
0.5-1.5 wt % of Mn;
0.1-0.3 wt % of Ti;
0.009-0.05 wt % of Be;
the balance of Al; and
less than 0.2 wt % of inevitable impurities,
wherein in the die-cast aluminum alloy the mass ratio of Me to Zn is (4.5-5):1 and the mass ratio of Si to Zn is (1.5-2):1.

2. The die-cast aluminum alloy according to claim 1 , consisting of:
5-7 wt % of Mg;
1.6-2.5 wt % of Si;
1.1-1.4 wt % of Zn;
0.6-1.0 wt % of Mn;
0.1-0.3 wt % of Ti;
0.01-0.022 wt % of Be;
the balance of Al; and
less than 0.2 wt % of inevitable impurities.

3. The die-cast aluminum alloy according to claim 1 , wherein in the die-cast aluminum alloy, the mass ratio of Zn to Be is (60-140):1.

4. The die-cast aluminum alloy according to claim 1 , wherein for the die-cast aluminum alloy, the tensile strength is not less than 350 MPa, the elongation is not less than 4%, and the relative standard deviation of the tensile strength is not greater than 10%.

5. The die-cast aluminum alloy according to claim 1 , wherein for the die-cast aluminum alloy, the tensile strength is 350-390 MPa, the elongation is 6-9%, and the relative standard deviation of the tensile strength is 5-8%.

6. The die-cast aluminum alloy according to claim 1 , wherein the die-cast aluminum alloy is used in computers, communication electronic products, or consumer electronic products.

7. A die-cast aluminum alloy, consisting of:
5-7 wt % of Mg;
1.6-2.5 wt % of Si;
1.1-1.4 wt % of Zn;
0.7 wt % of Mn;
0.1-0.3 wt % of Ti;
0.01-0.022 wt % of Be;
the balance of Al; and
less than 0.2 wt % of inevitable impurities,
wherein in the die-cast aluminum alloy, the mass ratio of Me to Zn is (4.5-5):1, and the mass ratio of Si to Zn is (1.5-2):1.

8. A method for preparing the die-cast aluminum alloy according to claim 1 , comprising:
smelting an aluminum-containing material in a smelting furnace,
adding a silicon-containing material, a manganese-containing material, a zinc-containing material, a magnesium-containing material, a beryllium-containing material, and a titanium-containing material for smelting after the aluminum-containing material is melted,
subjecting the mixed materials to refining and degassing and then casting to obtain an aluminum alloy ingot, and
melting and die-casting the aluminum alloy ingot, to obtain the die-cast aluminum alloy.

9. The method according to claim 8 , wherein a smelting temperature of the aluminum-containing material is 710-730° C., and a smelting temperature of the silicon-containing material, the manganese-containing material, the zine-containing material, the magnesium-containing material, the beryllium-containing material, and the titanium-containing material is 680-710° C.

Assignees

• Byd Co Ltd

Inventors

• Li Yunchun
• Guo Qiang
• Ren Youping
• Xie Yongliang

Classifications

• C22F1/047

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

• C22C1/026

  Alloys based on aluminium · CPC title

• B22D21/04 Primary

  Casting aluminium or magnesium {(no material; see B22D21/007)} · CPC title

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• C22C21/08 Primary

  with silicon · CPC title