Heat-treatment-free die-cast aluminum alloy material, preparation method thereof and automobile structural member

Patent metadata

Field	Value
Publication number	US-2025066882-A1
Application number	US-202418794288-A
Country	US
Kind code	A1
Filing date	Aug 5, 2024
Priority date	Aug 21, 2023
Publication date	Feb 27, 2025
Grant date	—

Abstract

A heat-treatment-free die-cast aluminum alloy material includes: 8.5 to 11.0 wt % of Si, 0.2 wt % or less of Fe, 1.8 to 3.0 wt % of Cu, 1.0 to 2.0 wt % of Mg, 1.0 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.2 to 0.8 wt % of a metal M selected from one or both of Min and Mo, and a balance of Al, based on a total weight of the die-cast aluminum alloy material.

First claim

What is claimed is:

1 . A heat-treatment-free die-cast aluminum alloy material, comprising:
8.5 to 11.0 wt % of Si, 0.2 wt % or less of Fe, 1.8 to 3.0 wt % of Cu, 1.0 to 2.0 wt % of Mg, 1.0 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.2 to 0.8 wt % of a metal M selected from one or both of Mn and Mo, and a balance of Al, based on a total weight of the die-cast aluminum alloy material.

2 . The die-cast aluminum alloy material according to claim 1 , comprising:
8.5 to 10 wt % of Si, 0.15 wt % or less of Fe, 2.0 to 2.5 wt % of Cu, 1.0 to 1.5 wt % of Mg, 1.5 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.3 to 0.6 wt % of the metal M, and a balance of Al, based on the total weight of the die-cast aluminum alloy material.

3 . The die-cast aluminum alloy material according to claim 1 , wherein the die-cast aluminum alloy material has a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.3% or more.

4 . The die-cast aluminum alloy material according to claim 1 , wherein the die-cast aluminum alloy material has a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.4% or more.

5 . A method for preparing a heat-treatment-free die-cast aluminum alloy material, comprising:
smelting a mixture comprising 8.5 to 11.0 wt % of Si, 0.2 wt % or less of Fe, 1.8 to 3.0 wt % of Cu, 1.0 to 2.0 wt % of Mg, 1.0 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.2 to 0.8 wt % of a metal M selected from one or both of Mn and Mo, and a balance of Al, in a smelting furnace to obtain a first alloy melt; subjecting the first alloy melt to a degassing treatment, a refining treatment and a first slagging-off treatment in a converter to obtain a second alloy melt; subjecting the second alloy melt to a heat preservation treatment and a second slagging-off treatment in a holding furnace to obtain a third alloy melt; and die casting the third alloy melt.

6 . The method according to claim 5 , wherein the smelting of the mixture is performed at a smelting temperature of 730 to 750° C. for a smelting time of 1 to 10 hours.

7 . The method according to claim 5 , wherein the smelting of the mixture is performed at a melting temperature of 740 to 750° C. for a melting time of 1 to 5 hours.

8 . The method according to claim 5 , wherein the degassing treatment is performed at a temperature of 710 to 720° C. for 10 to 15 minutes,
the refining treatment comprises: adding a refining agent at a temperature of 710 to 720° C. under stirring for refining, followed by standing for 10 to 20 minutes; and
the first slagging-off treatment comprises removing a dross by using a slagging-off tool.

9 . The method according to claim 8 , wherein the degassing treatment is performed at a temperature of 715 to 720° C. for 13 to 15 minutes.

10 . The method according to claim 5 , wherein the heat preservation treatment is performed at a heat preservation temperature of 650 to 670° C. for a heat preservation time of 0.1 to 10 hours; and
the second slagging-off treatment comprises removing a dross by using a slagging-off tool.

11 . The method according to claim 10 , wherein the heat preservation treatment is performed at a heat preservation temperature of 658 to 662° C. for a heat preservation time of 0.1 to 0.5 hours.

12 . The method according to claim 5 , wherein conditions for the casting treatment comprise: a casting pressure of 60 MPa or more, a high speed of 4.5 m/s or more, a vacuum degree of 60 mbar or less, a temperature of an aluminum melt of 650 to 670° C., a temperature of a mold after spraying of 150° C. or more, and an injection delay time of 1 second or less.

13 . The method according to claim 5 , wherein the conditions for the casting treatment comprise:
a casting pressure of 60 to 80 MPa, a high speed of 4.5±0.1 m/s, a vacuum degree of 40 to 50 mbar, a temperature of an aluminum melt of 658 to 662° C., a temperature of a mold after spraying of 150 to 160° C., and an injection delay time of 1±0.1 second.

14 . The method according to claim 5 , further comprising:
carrying out a first component detection on the first alloy melt, and performing the subjecting the first alloy melt to the degassing treatment, the refining treatment and the first slagging-off treatment when a result of the first component detection meets a first condition; carrying out a second component detection on the second alloy melt, and performing the subjecting the second alloy melt to the heat preservation treatment and the second slagging-off treatment when a result of the second component detection meets a second condition; and carrying out a third component detection on the third alloy melt, and performing the die casting the third alloy melt when a result of the third component detection meets a third condition; wherein the first condition, the second condition, and the third condition each independently comprise: an alloy melt comprising: 8.5 to 11.0 wt % of Si, 0.2 wt % or less of Fe, 1.8 to 3.0 wt % of Cu, 1.0 to 2.0 wt % of Mg, 1.0 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.2 to 0.8 wt % of a metal M selected from one or both of Mn and Mo, and a balance of Al.

15 . The method according to claim 5 , wherein the mixture comprises 8.5 to 10 wt % of Si, 0.15 wt % or less of Fe, 2.0 to 2.5 wt % of Cu, 1.0 to 1.5 wt % of Mg, 1.5 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.3 to 0.6 wt % of the metal M, and a balance of Al.

16 . The method according to claim 5 , wherein the heat-treatment-free die-cast aluminum alloy material obtained has a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.4% or more.

17 . An automobile structural member, comprising a die-cast aluminum alloy material, wherein the die-cast aluminum alloy material comprises:
8.5 to 11.0 wt % of Si, 0.2 wt % or less of Fe, 1.8 to 3.0 wt % of Cu, 1.0 to 2.0 wt % of Mg, 1.0 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0.02 to 0.07 wt % of Sr, 0.03 to 0.06 wt % of Zr, 0.2 to 0.8 wt % of a metal M selected from one or both of Mn and Mo, and a balance of Al, based on a total weight of the die-cast aluminum alloy material.

18 . The automobile structural member according to claim 17 , wherein the die-cast aluminum alloy material comprises:
8.5 to 10 wt % of Si, 0.15 wt % or less of Fe, 2.0 to 2.5 wt % of Cu, 1.0 to 1.5 wt % of Mg, 1.5 to 2.0 wt % of Zn, 0.1 to 0.3 wt % of Ti, 0 . 02 to 0 . 07 wt % of Sr, 0 . 03 to 0 . 06 wt % of Zr, 0 . 3 to 0 . 6 wt % of the metal M, and a balance of Al, based on the total weight of the die-cast aluminum alloy material.

19 . The automobile structural member according to claim 17 , wherein the die-cast aluminum alloy material has a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.3% or more.

20 . The automobile structural member according to claim 17 , wherein the die-cast aluminum alloy material has a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.4% or more.

Assignees

• Xiaomi Ev Tech Co Ltd

Inventors

• Chen Xiaodu
• Zhang Xingmeng

Classifications

• B22D17/30

  Accessories for supplying molten metal, e.g. in rations (supplying molten metal in ration in general B22D39/00) · CPC title

• B22D21/04

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

• C22B9/00

  General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals · CPC title

• C22B21/06

  refining {(electrolytic refining C25C; C22B21/0046, C22B21/0061 take precedence)} · CPC title

• C22B21/0092

  Remelting scrap, skimmings or any secondary source aluminium · CPC title