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US-12624423-B2 - Aluminum alloy and preparation method thereof, and aluminum alloy structural member

US12624423B2US 12624423 B2US12624423 B2US 12624423B2US-12624423-B2

Abstract

An aluminum alloy is provided. Based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy includes: 11-15% of Zn; 7.5-9% of Si; 1.2-2% of Cu; 0.3-0.5% of Mn; 0.05-0.3% of Mg; 0.1-0.2% of Ni; 0.001-0.04% of Sr; 0.05-0.3% of Ti; 0.01-0.15% of Fe; and 72.51-79.79% of Al.

Inventors

  • Qiang Guo
  • Mengmeng CAO
  • Quanyu GONG

Assignees

  • BYD COMPANY LIMITED

Dates

Publication Date
20260512
Application Date
20200326
Priority Date
20191226

Claims (20)

  1. 1 . An aluminum alloy, wherein based on a total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises: 11-15% of Zn; 7.5-9% of Si; 1.2-2% of Cu; 0.3-0.5% of Mn; 0.05-0.3% of Mg; 0.1-0.2% of Ni; 0.001-0.04% of Sr; 0.05-0.3% of Ti; 0.01-0.15% of Fe; and 72.51-79.79% of Al, wherein the aluminum alloy has a yield strength greater than or equal to 240 MPa, a tensile strength greater than or equal to 390 MPa, an elongation greater than or equal to 4%, and a fluidity in die casting greater than or equal to 1700 mm.
  2. 2 . The aluminum alloy according to claim 1 , wherein based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises: 11-13% of Zn; 8-9% of Si; 1.2-1.5% of Cu; 0.4-0.5% of Mn; 0.05-0.2% of Mg; 0.1-0.15% of Ni; 0.001-0.04% of Sr; 0.1-0.25% of Ti; 0.05-0.1% of Fe; and 72.26-79.1% of Al.
  3. 3 . The aluminum alloy according to claim 2 , wherein a weight ratio of Cu to Mg is 6:1-30:1.
  4. 4 . The aluminum alloy according to claim 3 , wherein based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises 11-12% of Zn, a weight ratio of Cu to Mg is 6:1-10:1, and a weight ratio of Ti to Ni is 0.9:1.1-1.1:0.9.
  5. 5 . The aluminum alloy according to claim 4 , wherein based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises 12-15% of Zn, a weight ratio of Cu to Mg is 12:1-24:1, and a weight ratio of Ti to Ni is 1.9:1.1-2.1:0.9.
  6. 6 . The aluminum alloy according to claim 1 , wherein a weight ratio of Cu to Mg is 6:1-30:1.
  7. 7 . The aluminum alloy according to claim 1 , wherein based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises 11-12% of Zn, a weight ratio of Cu to Mg is 6:1-10:1, and a weight ratio of Ti to Ni is 0.9:1.1-1.1:0.9.
  8. 8 . The aluminum alloy according to claim 1 , wherein based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy comprises 12-15% of Zn, a weight ratio of Cu to Mg is 12:1-24:1, and a weight ratio of Ti to Ni is 1.9:1.1-2.1:0.9.
  9. 9 . The aluminum alloy according to claim 1 , satisfying at least one of the following conditions: a sum of Fe and Mn is greater than or equal to 0.45%; or a weight ratio of Fe to Mn is 1:4-1:10.
  10. 10 . The aluminum alloy according to claim 1 , satisfying at least one of the following conditions: a sum of Fe and Mn is 0.45-0.6%; or a weight ratio of Fe to Mn is 1:5-1:9.
  11. 11 . The aluminum alloy according to claim 1 , further comprising inevitable impurities, wherein based on the total weight of the aluminum alloy, in percentage by weight, a content of an individual element in the inevitable impurities is less than or equal to 0.01%, and a total content of the inevitable impurities is less than or equal to 0.1%.
  12. 12 . The aluminum alloy according to claim 1 , satisfying at least one of the following conditions: a yield strength is greater than or equal to 240 MPa; a tensile strength is greater than or equal to 390 MPa; an elongation is greater than or equal to 4%; or a fluidity in die casting is greater than or equal to 1700 mm.
  13. 13 . The aluminum alloy according to claim 1 , satisfying at least one of the following conditions: the yield strength is 240-300 MPa; the tensile strength is 390-435 MPa; the elongation is 4-7.5%; or the fluidity in die casting is 1700-1800 mm.
  14. 14 . A method for preparing the aluminum alloy according to claim 1 , comprising: melting aluminum, a zinc-containing raw material, a silicon-containing raw material, a copper-containing raw material, a manganese-containing raw material, a magnesium-containing raw material, a nickel-containing raw material, a strontium-containing raw material, a titanium- containing raw material and an iron-containing raw material by heating to obtain a molten aluminum alloy; and deslagging, refining and casting on the molten aluminum alloy to obtain an aluminum alloy ingot.
  15. 15 . The method according to claim 14 , comprising: melting the aluminum and the silicon-containing raw material by heating to obtain a mixture, melting the copper-containing raw material, the manganese-containing raw material, the strontium-containing raw material, the nickel-containing raw material and the titanium-containing raw material to the mixture by heating to obtain a first molten aluminum alloy; melting the zinc-containing raw material to the first molten aluminum alloy by heating to obtain a second molten aluminum alloy; melting the magnesium-containing raw material to the second molten aluminum alloy under an inert atmosphere by heating to obtain a third molten aluminum alloy; and deslagging, refining and casting on the third molten aluminum alloy to obtain the aluminum alloy ingot.
  16. 16 . The method according to claim 14 , further comprising: die casting on the aluminum alloy ingot; wherein the die casting satisfies at least one of the following conditions: a die temperature is 200-300° C.; a feed temperature is 670-720° C.; or an injection speed is 1.9-2.3 m/s.
  17. 17 . An aluminum alloy structural member, wherein at least a part of the aluminum alloy structural member comprises the aluminum alloy according to claim 1 .
  18. 18 . The aluminum alloy structural member according to claim 17 , wherein the aluminum alloy structural member comprises at least one of computer structural member, communication structural member, consumer electronic structural member or automotive load-bearing structural member.
  19. 19 . An electronic device, comprising the aluminum alloy according to claim 1 .
  20. 20 . An automotive load-bearing structural member, comprising the aluminum alloy according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present disclosure is the National Stage of the PCT International Application No. PCT/CN2020/081382, filed on Mar. 26, 2020, which claims priority to and benefit of Chinese Patent Application Serial No. 201911370452.8 filed with the China National Intellectual Property Administration on Dec. 26, 2019. The entire content of the above-referenced applications is are incorporated herein by reference. FIELD The present disclosure relates to the technical field of materials, and particularly relates to an aluminum alloy and a method for preparing the same, and an aluminum alloy structural member. BACKGROUND Die casting, one of the basic forming methods for aluminum alloys, can be used for designing intricate structural member products. The most commonly used die casting aluminum alloy is ADC12, an Ai-Si—Cu alloy for die casting according to Japanese Industrial Standard JIS H5302. This material is good in fluidity and formability, large in molding window and high in cost performance, and has been widely used in aluminum alloy die casting products. ADC12 has the advantages of low density, high strength-to-weight ratio, etc., and can be used for casings, small-sized thin products, holders or the like. However, the die casting products of ADC12 are medium in strength, with a tensile strength of 230-250 MPa, a yield strength of 160-190 MPa and an elongation of less than 3%, which leads to a high tendency to deformation of the products. Therefore, it is difficult for this material to meet the strength requirements of products such as mobile phones and notebook computers in future. As a result, related techniques of die casting aluminum alloys still need to be improved. SUMMARY An objective of the present disclosure is to at least resolve one of the technical problems in the related art to some extent. Therefore, an objective of the present disclosure is to provide a high-strength die casting aluminum alloy. In one aspect of the present disclosure, the present disclosure provides an aluminum alloy. According to examples of the present disclosure, based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy includes: 11-15% of Zn; 7.5-9% of Si; 1.2-2% of Cu; 0.3-0.5% of Mn; 0.05-0.3% of Mg; 0.1-0.2% of Ni; 0.001-0.04% of Sr; 0.05-0.3% of Ti; 0.01-0.15% of Fe; and 72.51-79.79% of Al. By controlling the composition and contents of alloying elements, the aluminum alloy has the advantages of high mechanical strength, good ductility and excellent castability, and is suitable for structural members requiring high strength, such as 3C product structural members and automotive load-bearing structural members. In another aspect of the present disclosure, the present disclosure provides a method for preparing the aforementioned aluminum alloy. According to examples of the present disclosure, the method includes: melting aluminum, a zinc-containing raw material, a silicon-containing raw material, a copper-containing raw material, a manganese-containing raw material, a magnesium-containing raw material, a nickel-containing raw material, a strontium-containing raw material, a titanium-containing raw material and an iron-containing raw material by heating to obtain a molten aluminum alloy; and deslagging, refining and casting on the molten aluminum alloy to obtain an aluminum alloy ingot. The method is simple and convenient to operate, and easy for industrial implementation. The obtained aluminum alloy has the advantages of high mechanical strength, good ductility and excellent castability. In another aspect of the present disclosure, the present disclosure provides an aluminum alloy structural member. According to examples of the present disclosure, at least a part of the aluminum alloy structural member comprises the aforementioned aluminum alloy. The aluminum alloy structural member has all the features and advantages of the aforementioned aluminum alloy, which will not be described in detail here. DETAILED DESCRIPTION Embodiments of the present disclosure will be described in detail below. The embodiments described below are exemplary and for explaining the present disclosure only, and are not intended to be construed as limiting the present disclosure. If the specific techniques or conditions are not indicated in the examples, the techniques or conditions described in the literature in the art or the product specification shall be followed. Those reagents or instruments whose manufacturers are not given are conventional products that are commercially available. In one aspect of the present disclosure, the present disclosure provides an aluminum alloy. According to examples of the present disclosure, based on the total weight of the aluminum alloy, in percentage by weight, the aluminum alloy includes: 11-15% of Zn; 7.5-9% of Si; 1.2-2% of Cu; 0.3-0.5% of Mn; 0.05-0.3% of Mg; 0.1-0.2% of Ni; 0.001-0.04% of Sr; 0.05-0.3% of Ti; 0.01-0.15% of Fe; and 72.51-79