Die-cast aluminum alloy and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-2022195563-A1
Application number	US-202017600267-A
Country	US
Kind code	A1
Filing date	Mar 26, 2020
Priority date	Apr 12, 2019
Publication date	Jun 23, 2022
Grant date	—

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

1 . A die-cast aluminum alloy, comprising based:
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.

2 . The die-cast aluminum alloy according to claim 1 , comprising:
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 any one of claim 1 , wherein in the die-cast aluminum alloy, the mass ratio of Mg to Zn is (4.5-5):1, and the mass ratio of Si to Zn is (0.5-2):1.

5 . The die-cast aluminum alloy according to any one of claim 1 , wherein based on the total mass of the die-cast aluminum alloy, among the inevitable impurities, the content of each of the Cu, Ni, Cr, Zr, Ag, Sr, and Sn impurities is independently less than 0.1%, and the content of Fe is less than 0.15%.

6 . The die-cast aluminum alloy according to any one of claim 1 , comprising a Mg 2 Si phase, a MgZn 2 phase, an Al 6 Mn phase, and a TiAl 2 phase.

7 . The die-cast aluminum alloy according to any one of 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%.

8 . The die-cast aluminum alloy according to any one of 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%.

9 . A method for preparing the die-cast aluminum alloy, 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.

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

11 . 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.

Assignees

• Byd Co Ltd

Inventors

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

Classifications

• C22C21/08 Primary

  with silicon · CPC title

• B22D21/04 Primary

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

• C22F1/047

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

• C22C1/026

  Alloys based on aluminium · CPC title

• B22D21/007

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