Heat-free aluminum alloys and their preparation methods

Abstract

The application relates to the technical field of aluminum alloy, and discloses a heat-treatment-free aluminum alloy and a preparation method thereof, which comprises the following steps: preheating industrial pure aluminum, pure magnesium and various required intermediate alloys under the environment of 200-220 DEG C; calculating and weighing the above materials according to the mass percentage of the chemical composition of the alloy; adding the first material into a smelting furnace and carrying out first alloying treatment and first refining slag removal to obtain a first alloy melt; adding the second material into the first alloy melt to carry out second alloying treatment and second refining slag removal, thereby obtaining a second alloy melt; adding the third material into the second alloy melt to carry out third alloying treatment and third refining slag removal, thereby obtaining a third alloy melt; introducing argon into the third alloy melt; smelting after standing; obtaining a fourth alloy melt; and carrying out high-pressure die casting on the fourth alloy melt to obtain the heat-treatment-free aluminum alloy. Therefore, the heat-treatment-free aluminum alloy has the advantages of high tensile strength, yield strength and elongation after fracture, and good fluidity.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy technology, and more particularly to a heat-free aluminum alloy and a method for preparing a heat-free aluminum alloy. Background Technology

[0002] Meeting the requirements of "lightweighting" has become an inevitable trend in the automotive industry. Aluminum alloys have advantages such as light weight, high strength, and good corrosion resistance, and are therefore widely used in the automotive parts manufacturing industry. Currently, large aluminum alloy parts used in automobiles mainly include components such as body shock absorber towers, chassis subframes, and control arms, most of which are manufactured using low-pressure casting processes. Compared to low-pressure casting, high-vacuum integrated die casting significantly improves production efficiency and can produce more complex and thinner-walled parts. After parts are formed using high-vacuum integrated die casting, heat treatment is not recommended to precisely control deformation and dimensional accuracy.

[0003] However, traditional casting aluminum alloys require T6 heat treatment (solution treatment) to meet certain mechanical property requirements, but the fluidity of aluminum alloys cannot meet the process requirements of high vacuum integrated die casting, thereby reducing tensile strength, yield strength and elongation after fracture. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to provide a heat-free aluminum alloy by adding rare earth elements to the aluminum alloy in appropriate proportions, so that the produced aluminum alloy can meet the performance requirements of heat-free high-vacuum die-casting aluminum alloys for large structural components, reducing the aluminum alloy production process, improving the mechanical properties of heat-free high-vacuum die-casting aluminum alloys, and also increasing the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, while also exhibiting good fluidity.

[0005] The second objective of this invention is to provide a method for preparing heat-free aluminum alloys.

[0006] To achieve the above objectives, a first aspect of the present invention provides a heat-treatable aluminum alloy, wherein the alloy comprises the following components and their mass percentages: Si 6.5–7.5%, Mg 0.45–0.9%, Sn 0.05–0.15%, Ti 0.15–0.35%, Zn 0.15–0.35%, Sr 0.02–0.08%, Fe 0.1–0.25%, Cu 0.2–0.5%, Mo 0.05–0.15%, V 0.05–0.25%, Cr 0.15–0.35%, Ce 0.05–0.15%, Y 0.03–0.15%, Gd 0.05–0.2%, Dy 0.05–0.25%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%.

[0007] In addition, the heat-free aluminum alloy according to the above embodiments of the present invention may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%.

[0009] According to some embodiments of the present invention, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the total impurities are ≤0.3%.

[0010] According to some embodiments of the present invention, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 7.2%, Mg 0.58%, Sn 0.12%, Ti 0.18%, Zn 0.28%, Sr 0.06%, Fe 0.15%, Cu 0.37%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the total impurities are ≤0.3%.

[0011] According to some embodiments of the present invention, the raw material for Si is an Al-Si master alloy, the raw material for Mg is pure Mg, the raw material for Sn is an Al-Sn master alloy, the raw material for Ti is an Al-Ti master alloy, the raw material for Zn is an Al-Zn master alloy, the raw material for Sr is an Al-Sr master alloy, the raw material for Fe is an Al-Fe master alloy, the raw material for Cu is an Al-Cu master alloy, the raw material for Mo is an Al-Mo master alloy, the raw material for V is an Al-V master alloy, the raw material for Cr is an Al-Cr master alloy, the raw material for Ce is an Al-Ce master alloy, the raw material for Y is an Al-Y master alloy, the raw material for Gd is an Al-Gd master alloy, the raw material for Dy is an Al-Dy master alloy, and the raw material for Al is pure Al.

[0012] According to an embodiment of the present invention, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.5–7.5%, Mg 0.45–0.9%, Sn 0.05–0.15%, Ti 0.15–0.35%, Zn 0.15–0.35%, Sr 0.02–0.08%, Fe 0.1–0.25%, Cu 0.2–0.5%, Mo 0.05–0.15%, V 0.05–0.25%, Cr 0.15–0.35%, Ce 0.05–0.15%, Y 0.03–0.15%, Gd 0.05–0.2%, Dy 0.05–0.25%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%. Therefore, by adding rare earth elements to aluminum alloys and using appropriate proportions, the produced aluminum alloys can meet the performance requirements of heat-free high-vacuum die-cast aluminum alloys for large structural components, reduce the aluminum alloy production process, improve the mechanical properties of heat-free high-vacuum die-cast aluminum alloys, and also improve the tensile strength, yield strength and elongation after fracture of aluminum alloys, while also having good fluidity.

[0013] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, a second objective of this invention is to propose a method for preparing heat-free aluminum alloys. This method involves adding rare earth elements to the aluminum alloy in appropriate proportions to ensure that the produced aluminum alloy meets the performance requirements of heat-free high-vacuum die-casting aluminum alloys for large structural components. This reduces the aluminum alloy production process, improves the mechanical properties of heat-free high-vacuum die-casting aluminum alloys, and also enhances the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, while also exhibiting good fluidity.

[0014] To achieve the above objectives, a second aspect of the present invention provides a method for preparing a heat-free aluminum alloy, comprising the following steps: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 200–220°C; calculating and weighing the materials according to the mass percentage of the alloy's chemical composition; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; and in the first alloy melt... A second alloy melt is obtained by adding a second material to the first alloy melt for a second alloying treatment and a second refining and slag removal process. The second material includes pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy. A third alloy melt is obtained by adding a third material to the second alloy melt for a third alloying treatment and a third refining and slag removal process. The third material includes Al-Sr master alloy and Al-Ti master alloy. Argon gas is introduced into the third alloy melt, and after settling, it is smelted to obtain a fourth alloy melt. The fourth alloy melt is then subjected to high-pressure die casting to obtain a heat-free aluminum alloy.

[0015] In addition, the method for preparing heat-free aluminum alloys according to the above embodiments of the present invention may also have the following additional technical features:

[0016] According to some embodiments of the present invention, the temperature of the first alloying treatment is 750–770°C; the temperature of the second alloying treatment is 760–780°C; the temperature of the third alloying treatment is 730–750°C; the melting temperature is 720–740°C; and the conditions for high-pressure die casting include a temperature of 680–720°C, a pressure of 50–80 MPa, and an injection speed of 5.0–8.0 m / s.

[0017] According to some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloy further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 220°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 750°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 760°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt and performing a second alloying treatment and a second refining and slag removal at 760°C. A third alloying treatment and a third refining and slag removal process are performed at 30°C to obtain a third alloy melt; the third material includes Al-Sr master alloy and Al-Ti master alloy; argon gas is continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it is melted at 720°C to obtain a fourth alloy melt; the fourth alloy melt is then subjected to high-pressure die casting at 690°C, a pressure of 60MPa, and an injection speed of 6.0m / s to obtain a heat-free aluminum alloy; wherein, the heat-free aluminum... The alloy comprises the following components and their respective mass percentages: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%.

[0018] According to some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloy further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 210°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 760°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 770°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt. The materials were subjected to a third alloying treatment and a third refining and slag removal at 740℃ to obtain a third alloy melt; the third material included Al-Sr master alloy and Al-Ti master alloy; argon gas was continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it was melted at 730℃ to obtain a fourth alloy melt; the fourth alloy melt was subjected to high-pressure die casting at 710℃, a pressure of 70MPa, and an injection speed of 7.0m / s to obtain a heat-free aluminum alloy; The heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, with a total impurity content ≤0.3%.

[0019] According to some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloy further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 220°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 770°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 780°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt. The material undergoes a third alloying treatment and a third refining and slag removal at 750℃ to obtain a third alloy melt; the third material includes Al-Sr master alloy and Al-Ti master alloy; argon gas is continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it is melted at 740℃ to obtain a fourth alloy melt; the fourth alloy melt is then subjected to high-pressure die casting at 700℃, a pressure of 65MPa, and an injection speed of 6.50m / s to obtain a heat-free aluminum alloy; The composition and mass percentage of the heat-free aluminum alloy are as follows: Si 7.2%, Mg 0.58%, Sn 0.12%, Ti 0.18%, Zn 0.28%, Sr 0.06%, Fe 0.15%, Cu 0.37%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, with the total impurities ≤0.3%.

[0020] According to the method for preparing heat-free aluminum alloys according to embodiments of the present invention, industrial pure aluminum, pure magnesium, and various required intermediate alloys are preheated at an environment of 200-220°C. The materials are weighed according to the mass percentage of the alloy's chemical composition. A first material is added to a melting furnace for a first alloying treatment and a first refining and slag removal process to obtain a first alloy melt. The first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy. A second material is added to the first alloy melt for a second alloying treatment and... A second refining and slag removal process yields a second alloy melt. This second material includes pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy. A third material is added to the second alloy melt for a third alloying treatment and a third refining and slag removal process, yielding a third alloy melt. This third material includes Al-Sr master alloy and Al-Ti master alloy. Argon gas is introduced into the third alloy melt, and after settling, it is smelted to obtain a fourth alloy melt. The fourth alloy melt is then subjected to high-pressure die casting to obtain a heat-free aluminum alloy. Therefore, this method adds rare earth elements to aluminum alloys in appropriate proportions to ensure that the produced aluminum alloy meets the performance requirements of heat-free high-vacuum die-cast aluminum alloys for large structural components. This reduces the aluminum alloy production process, improves the mechanical properties of heat-free high-vacuum die-cast aluminum alloys, and also enhances the tensile strength, yield strength, and elongation after fracture, while maintaining good fluidity.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a flowchart of a method for preparing heat-free aluminum alloys according to some embodiments of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by those skilled in the art. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] As the background section describes, with the increasingly widespread and mature application of aluminum alloy castings in automobiles, 3C products, and 5G communication technology, the demand for high-performance die-cast aluminum alloys is growing, making the research and development of high-performance die-cast aluminum alloys increasingly important and urgent. Die-cast aluminum alloys are mainly Al-Si based, while other major alloying elements can include Cu, Mg, Fe, Mn, Zn, and B. Depending on the added alloying elements, they can be further classified into Al-Si alloys, Al-Si-Cu alloys, Al-Si-Mg alloys, Al-SiCu-Mg alloys, and Al-Si-B alloys. The composition design of die-cast aluminum alloys must consider both mechanical properties and casting performance, requiring the alloy to possess not only excellent mechanical properties but also excellent fluidity and demolding properties.

[0026] In the process of realizing this invention, the applicant discovered that the traditional casting process of aluminum alloys requires T6 heat treatment (solution treatment) to meet certain mechanical property requirements. However, the fluidity of aluminum alloys cannot meet the process requirements of high vacuum integrated die casting, thereby reducing tensile strength, yield strength and elongation after fracture.

[0027] The following description, with reference to the accompanying drawings, illustrates the heat-free aluminum alloy and its preparation method according to embodiments of the present invention.

[0028] The composition and mass percentage of the heat-free aluminum alloy are as follows: Si 6.5–7.5%, Mg 0.45–0.9%, Sn 0.05–0.15%, Ti 0.15–0.35%, Zn 0.15–0.35%, Sr 0.02–0.08%, Fe 0.1–0.25%, Cu 0.2–0.5%, Mo 0.05–0.15%, V 0.05–0.25%, Cr 0.15–0.35%, Ce 0.05–0.15%, Y 0.03–0.15%, Gd 0.05–0.2%, Dy 0.05–0.25%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%.

[0029] The raw material for Si is Al-Si master alloy, the raw material for Mg is pure Mg, the raw material for Sn is Al-Sn master alloy, the raw material for Ti is Al-Ti master alloy, the raw material for Zn is Al-Zn master alloy, the raw material for Sr is Al-Sr master alloy, the raw material for Fe is Al-Fe master alloy, the raw material for Cu is Al-Cu master alloy, the raw material for Mo is Al-Mo master alloy, the raw material for V is Al-V master alloy, the raw material for Cr is Al-Cr master alloy, the raw material for Ce is Al-Ce master alloy, the raw material for Y is Al-Y master alloy, the raw material for Gd is Al-Gd master alloy, the raw material for Dy is Al-Dy master alloy, and the raw material for Al is pure Al.

[0030] As a specific embodiment, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.5%, Mg 0.45%, Sn 0.05%, Ti 0.15%, Zn 0.15%, Sr 0.02%, Fe 0.1%, Cu 0.2%, Mo 0.05%, V 0.05%, Cr 0.15%, Ce 0.05%, Y 0.03%, Gd 0.05%, Dy 0.05%, with the balance being Al and impurities, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%.

[0031] As another specific embodiment, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 7.5%, Mg 0.9%, Sn 0.15%, Ti 0.35%, Zn 0.35%, Sr 0.08%, Fe 0.25%, Cu 0.5%, Mo 0.15%, V 0.25%, Cr 0.35%, Ce 0.15%, Y 0.15%, Gd 0.2%, Dy 0.25%, with the balance being Al and impurities, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%.

[0032] The composition and mass percentage of the heat-free aluminum alloy include: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, with the balance being Al and impurities, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%.

[0033] The composition and mass percentage of the heat-free aluminum alloy include: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%.

[0034] The composition and mass percentage of the heat-free aluminum alloy include: Si 7.2%, Mg 0.58%, Sn 0.12%, Ti 0.18%, Zn 0.28%, Sr 0.06%, Fe 0.15%, Cu 0.37%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%.

[0035] Table 1 shows the composition and properties of heat-free aluminum alloys.

[0036] Table 1

[0037] Example Example 1 Example 2 Example 3 Si (Silicon) 7.0％ 6.8％ 7.2％ Mg (Magnesium) 0.65％ 0.7％ 0.58％ Sn (Tin) 0.10％ 0.08％ 0.12％ Ti (Titanium) 0.2％ 0.20％ 0.18％ Zn (Zinc) 0.25％ 0.20％ 0.28％ Sr (Strontium) 0.05％ 0.03％ 0.06％ Fe (Iron) 0.15％ 0.20％ 0.15％ Cu (Copper) 0.35％ 0.25％ 0.37％ Mo (Molybdenum) 0.10％ 0.07％ 0.07％ V (Vanadium) 0.15％ 0.20％ 0.20％ Cr (Chromium) 0.25％ 0.18％ 0.18％ Ce (Cerium) 0.08％ 0.06％ 0.06％ Y (Yttrium) 0.06％ 0.10％ 0.10％ Gd (Gadolinium) 0.10％ 0.15％ 0.15％ Dy (Dysprosium) 0.15％ 0.10％ 0.10％ Impurity 0.3％ 0.3％ 0.3％ Al (Aluminum) Remainder Remainder Remainder Tensile strength / MPa 323 331 316 Yield strength / MPa 265 258 249 Elongation after fracture / % 9.5 9.5 9.0 Flow distance / mm 179 183 176

[0038] Therefore, as can be seen from Table 1, the tensile strength of Examples 1, 2, and 3 is all greater than or equal to 310 MPa, the yield strength is all greater than or equal to 240 MPa, the elongation after fracture is all greater than or equal to 9%, and the flow distance is all greater than or equal to 170 mm. In the comparative example, when A356.0 (silicon-aluminum alloy) was used, the tensile strength of this aluminum alloy was 291 MPa, the yield strength was 228 MPa, the elongation after fracture was 7.5%, and the flow distance was 121 mm. The tensile strength, yield strength, elongation after fracture, and flow distance of this aluminum alloy are all worse than those of Examples 1, 2, and 3. Furthermore, in Examples 1, 2, and 3, the flow distance of the aluminum alloy improved as the composition values ​​of the heat-free aluminum alloy decreased.

[0039] In some embodiments, the rare earth elements in the composition of the heat-free aluminum alloy are Ce, Y, Gd, and Dy. Adding rare earth elements to the aluminum alloy can improve its tensile strength, yield strength, and elongation after fracture, while also providing good fluidity. This aluminum alloy can be used in the manufacture of large components such as chassis and subframes. Compared to low-pressure casting and crossbeam welding subframes, the aluminum alloy of this invention reduces the number of welding points by four and achieves a 20% weight reduction.

[0040] According to an embodiment of the present invention, the heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.5–7.5%, Mg 0.45–0.9%, Sn 0.05–0.15%, Ti 0.15–0.35%, Zn 0.15–0.35%, Sr 0.02–0.08%, Fe 0.1–0.25%, Cu 0.2–0.5%, Mo 0.05–0.15%, V 0.05–0.25%, Cr 0.15–0.35%, Ce 0.05–0.15%, Y 0.03–0.15%, Gd 0.05–0.2%, Dy 0.05–0.25%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%. Therefore, by adding rare earth elements to aluminum alloys and using appropriate proportions, the produced aluminum alloys can meet the performance requirements of heat-free high-vacuum die-cast aluminum alloys for large structural components, reduce the aluminum alloy production process, improve the mechanical properties of heat-free high-vacuum die-cast aluminum alloys, and also improve the tensile strength, yield strength and elongation after fracture of aluminum alloys, while also having good fluidity.

[0041] refer to Figure 1 This is a flowchart of a method for preparing heat-free aluminum alloys according to some embodiments of the present invention.

[0042] like Figure 1As shown, the method for preparing heat-free aluminum alloy according to an embodiment of the present invention may include the following steps:

[0043] S101, preheat industrial pure aluminum, pure magnesium and various required intermediate alloys in an environment of 200-220℃, and weigh the above materials according to the mass percentage of the chemical composition of the alloy.

[0044] Specifically, to prevent the generation of water vapor and sparks during the preparation of aluminum alloys, it is necessary to preheat industrial pure aluminum, pure magnesium, and various required intermediate alloys at an environment of 200-220°C. Pure aluminum, pure magnesium, and various required intermediate alloys are calculated and weighed according to the mass percentage of the chemical composition of each intermediate alloy, so that the composition of the aluminum alloy meets the pre-set standards.

[0045] S302, the first material is added to the melting furnace and subjected to the first alloying treatment and the first refining and slag removal to obtain the first alloy melt; wherein, the first material includes pure Al, Al-Si master alloy, Al-Fe master alloy, Al-Mo master alloy, Al-V master alloy, Al-Zn master alloy, and Al-Cr master alloy.

[0046] Specifically, after calculating and weighing pure aluminum, pure magnesium, and various required intermediate alloys, pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy are added to the melting furnace. The first alloying treatment and the first refining and slag removal are carried out to stir the raw materials until all the raw materials are melted to form a uniform alloy melt. Impurities and impure substances in the metal are removed to improve the purity and quality of the metal, thereby obtaining the first alloy melt.

[0047] Alloying refers to the process of adding elements to make a metal into an alloy (under certain process conditions) with the desired properties. To ensure the various physical and chemical properties of steel, alloying additives are added to adjust its composition to a specified range. Elements that are not present or present in small amounts in ordinary steel (C, Si, Mn, S, or P) are all alloying elements. Alloying additives can be pure materials (nickel, copper, aluminum, graphite powder, etc.), ferroalloys (ferromanganese, ferrosilicon, ferrovanadium, ferrochrome, etc.), or compounds of alloying elements (oxides, carbides, nitrides, etc.). In steelmaking, deoxidation and alloying are generally carried out almost simultaneously, and sometimes it is impossible to completely separate deoxidizing and alloying elements. However, the purposes and physicochemical reaction processes of deoxidation and alloying are different. Refining slag formation is a commonly used metal smelting process used to remove impurities and impurities from metals, improving their purity and quality. The main purpose of refining slag formation is to remove impurities and impurities from metals, improving their purity and quality. During metal smelting, due to the influence of raw materials, reducing agents, and additives, metals often contain impurities and impurities such as oxides, sulfides, nitrides, and carbides. These impurities and impurities reduce the mechanical properties, electrical conductivity, and corrosion resistance of the metal, and also adversely affect subsequent processing and use. Refining and slag formation can effectively remove these impurities and impurities, improving the quality of the metal.

[0048] S103, a second material is added to the first alloy melt for a second alloying treatment and a second refining and slag removal to obtain a second alloy melt; wherein, the second material includes pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy.

[0049] Specifically, after obtaining the first alloy melt, pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy are added to the first alloy melt, and a second alloying treatment and a second refining and slag removal are carried out to stir the raw materials until all the raw materials are melted to form a homogeneous alloy melt, and to remove impurities and impure substances from the metal, thereby improving the purity and quality of the metal, thus obtaining the second alloy melt.

[0050] S104, a third material is added to the second alloy melt for a third alloying treatment and a third refining and slag removal to obtain a third alloy melt; wherein, the third material includes Al-Sr master alloy and Al-Ti master alloy.

[0051] Specifically, after obtaining the second alloy melt, Al-Sr master alloy and Al-Ti master alloy are added to the second alloy melt, and a third alloying treatment and a third refining and slag removal are carried out to stir the raw materials until all the raw materials are melted to form a uniform alloy melt, and to remove impurities and impure substances from the metal to improve the purity and quality of the metal, thereby obtaining the third alloy melt.

[0052] S105, Argon gas is introduced into the third alloy melt, and after standing, it is smelted to obtain the fourth alloy melt.

[0053] Specifically, after obtaining the third alloy melt, argon gas is introduced into the third alloy melt for a certain period of time, and the flow rate of the argon gas can be 0.2 m³ / s. 3 / h, and then let it stand for a certain period of time to allow impurities in the melt to precipitate or float to the surface. After standing, it is then smelted to obtain the fourth alloy melt.

[0054] S106, the fourth alloy melt is subjected to high pressure die casting to obtain a heat-free aluminum alloy.

[0055] Specifically, after obtaining the fourth alloy melt, the fourth alloy melt is subjected to high-pressure die casting under certain temperature, pressure and injection speed conditions to obtain a treatment-free aluminum alloy.

[0056] In some embodiments of the present invention, the temperature of the first alloying treatment is 750–770°C; the temperature of the second alloying treatment is 760–780°C; the temperature of the third alloying treatment is 730–750°C; the melting temperature is 720–740°C; and the conditions for high-pressure die casting include a temperature of 680–720°C, a pressure of 50–80 MPa, and an injection speed of 5.0–8.0 m / s.

[0057] In some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloys further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 220°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 750°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 760°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt and performing a second alloying treatment and a second refining and slag removal at 760°C. A third alloying treatment and a third refining and slag removal process are performed at 30°C to obtain a third alloy melt; the third material includes Al-Sr master alloy and Al-Ti master alloy; argon gas is continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it is melted at 720°C to obtain a fourth alloy melt; the fourth alloy melt is then subjected to high-pressure die casting at 690°C, a pressure of 60MPa, and an injection speed of 6.0m / s to obtain a heat-free aluminum alloy; wherein, the heat-free aluminum... The alloy comprises the following components and their respective mass percentages: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, with the balance being Al and impurities, wherein the total amount of impurities is ≤0.3%.

[0058] As a specific embodiment, the heat-free aluminum alloy comprises the following components and their respective mass percentages: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, with the balance being Al and impurities. The percentage of any single impurity element is ≤0.1%, and the total impurity content is ≤0.3%. Industrial pure aluminum, pure magnesium, and various required intermediate alloys are preheated at 220°C. The pure aluminum, pure magnesium, and various required intermediate alloys are weighed according to their chemical composition mass percentages.

[0059] Pure Al, Al-Si master alloy, Al-Fe master alloy, Al-Mo master alloy, Al-V master alloy, Al-Zn master alloy, and Al-Cr master alloy are added to a melting furnace, and a first alloying treatment and a first refining and slag removal are performed at 750℃ to form a homogeneous alloy melt, thus obtaining the first alloy melt. Then, pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy are added to the first alloy melt, and a second alloying treatment and a second refining and slag removal are performed at 760℃ to form a homogeneous alloy melt, thus obtaining the second alloy melt. Finally, Al-Sr master alloy and Al-Ti master alloy are added to the second alloy melt, and a third alloying treatment and a third refining and slag removal are performed at 730℃ to form a homogeneous alloy melt, thus obtaining the third alloy melt. Argon gas was continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, impurities in the melt were allowed to precipitate or float to the surface. The melt was then smelted at 720°C to obtain the fourth alloy melt. Finally, the fourth alloy melt was subjected to high-pressure die casting at 690°C, 60 MPa, and an injection speed of 6.0 m / s to obtain a heat-free aluminum alloy. This process improves the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, and also provides good fluidity.

[0060] In some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloys further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 210°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 760°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 770°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt... The materials were subjected to a third alloying treatment and a third refining and slag removal at 740℃ to obtain a third alloy melt; the third material included Al-Sr master alloy and Al-Ti master alloy; argon gas was continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it was melted at 730℃ to obtain a fourth alloy melt; the fourth alloy melt was subjected to high-pressure die casting at 710℃, a pressure of 70MPa, and an injection speed of 7.0m / s to obtain a heat-free aluminum alloy; The heat-free aluminum alloy comprises the following components and their mass percentages: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, with a total impurity content ≤0.3%.

[0061] As a specific embodiment, the heat-free aluminum alloy comprises the following components and their respective mass percentages: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%. Industrial pure aluminum, pure magnesium, and various required intermediate alloys are preheated at 210°C, and the materials are weighed according to their chemical composition mass percentages.

[0062] Pure Al, Al-Si master alloy, Al-Fe master alloy, Al-Mo master alloy, Al-V master alloy, Al-Zn master alloy, and Al-Cr master alloy are added to a melting furnace, and a first alloying treatment and a first refining and slag removal are performed at 760℃ to form a homogeneous alloy melt, thus obtaining the first alloy melt. Then, pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy are added to the first alloy melt, and a second alloying treatment and a second refining and slag removal are performed at 770℃ to form a homogeneous alloy melt, thus obtaining the second alloy melt. Finally, Al-Sr master alloy and Al-Ti master alloy are added to the second alloy melt, and a third alloying treatment and a third refining and slag removal are performed at 740℃ to form a homogeneous alloy melt, thus obtaining the third alloy melt. Argon gas was continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, impurities in the melt were allowed to precipitate or float to the surface. The melt was then smelted at 730°C to obtain the fourth alloy melt. Finally, the fourth alloy melt was subjected to high-pressure die casting at 710°C, a pressure of 70 MPa, and an injection speed of 7.0 m / s to obtain a heat-free aluminum alloy. This process improves the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, and also provides good fluidity.

[0063] In some embodiments of the present invention, the above-mentioned method for preparing heat-free aluminum alloys further includes: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at 220°C; calculating and weighing the materials according to the mass percentage of the chemical composition of the alloys; adding a first material to a melting furnace and performing a first alloying treatment and a first refining and slag removal at 770°C to obtain a first alloy melt; wherein the first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; adding a second material to the first alloy melt and performing a second alloying treatment and a second refining and slag removal at 780°C to obtain a second alloy melt; wherein the second material includes pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; adding a third material to the second alloy melt. The material undergoes a third alloying treatment and a third refining and slag removal at 750℃ to obtain a third alloy melt; the third material includes Al-Sr master alloy and Al-Ti master alloy; argon gas is continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes, it is melted at 740℃ to obtain a fourth alloy melt; the fourth alloy melt is then subjected to high-pressure die casting at 700℃, a pressure of 65MPa, and an injection speed of 6.50m / s to obtain a heat-free aluminum alloy; The composition and mass percentage of the heat-free aluminum alloy are as follows: Si 7.2%, Mg 0.58%, Sn 0.12%, Ti 0.18%, Zn 0.28%, Sr 0.06%, Fe 0.15%, Cu 0.37%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, with the total impurities ≤0.3%.

[0064] As a specific embodiment, the composition and mass percentage of the heat-free aluminum alloy are as follows: Si 7.2%, Mg 0.58%, Sn 0.12%, Ti 0.18%, Zn 0.28%, Sr 0.06%, Fe 0.15%, Cu 0.37%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the content of a single impurity element is ≤0.1%, and the total amount of impurities is ≤0.3%. Industrial pure aluminum, pure magnesium, and various required intermediate alloys are preheated at 220°C, and the materials are weighed according to the mass percentage of the alloy's chemical composition.

[0065] Pure Al, Al-Si master alloy, Al-Fe master alloy, Al-Mo master alloy, Al-V master alloy, Al-Zn master alloy, and Al-Cr master alloy are added to a melting furnace, and a first alloying treatment and a first refining and slag removal are performed at 770℃ to form a homogeneous alloy melt, thus obtaining the first alloy melt. Then, pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy are added to the first alloy melt, and a second alloying treatment and a second refining and slag removal are performed at 780℃ to form a homogeneous alloy melt, thus obtaining the second alloy melt. Finally, Al-Sr master alloy and Al-Ti master alloy are added to the second alloy melt, and a third alloying treatment and a third refining and slag removal are performed at 750℃ to form a homogeneous alloy melt, thus obtaining the third alloy melt. Argon gas was continuously introduced into the third alloy melt for 5 minutes, and after standing for 30 minutes to allow impurities in the melt to precipitate or float, it was then melted at 740℃ to obtain the fourth alloy melt. Finally, the fourth alloy melt was subjected to high-pressure die casting at 700℃, a pressure of 65MPa, and an injection speed of 6.50m / s to obtain a heat-free aluminum alloy, which can improve the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, and also has good fluidity.

[0066] In summary, according to the method for preparing heat-free aluminum alloys according to embodiments of the present invention, industrial pure aluminum, pure magnesium, and various required intermediate alloys are preheated at an environment of 200-220°C. The above materials are weighed according to the mass percentage of the chemical composition of the alloy. A first material is added to a melting furnace and subjected to a first alloying treatment and a first refining and slag removal to obtain a first alloy melt. The first material includes pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy. A second material is added to the first alloy melt for a second alloying treatment. The process involves a second alloying treatment and a second refining and slag removal to obtain a second alloy melt. This second material includes pure Mg, Al-Sn master alloy, Al-Cu master alloy, Al-Ce master alloy, Al-Y master alloy, Al-Gd master alloy, and Al-Dy master alloy. A third material is added to the second alloy melt for a third alloying treatment and a third refining and slag removal to obtain a third alloy melt. This third material includes Al-Sr master alloy and Al-Ti master alloy. Argon gas is introduced into the third alloy melt, and after settling, it is smelted to obtain a fourth alloy melt. The fourth alloy melt is then subjected to high-pressure die casting to obtain a heat-free aluminum alloy. Therefore, this method adds rare earth elements to aluminum alloys in appropriate proportions to ensure that the produced aluminum alloy meets the performance requirements of heat-free high-vacuum die-cast aluminum alloys for large structural components. This reduces the aluminum alloy production process, improves the mechanical properties of heat-free high-vacuum die-cast aluminum alloys, and also enhances the tensile strength, yield strength, and elongation after fracture of the aluminum alloy, while maintaining good fluidity.

[0067] The foregoing has described some embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than those in the foregoing embodiments and still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0068] Unless otherwise defined, the technical or scientific terms used in the embodiments of this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0069] While the spirit and principles of the invention have been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments, and the division of aspects does not imply that features in these aspects cannot be combined for benefit; such division is merely for ease of description. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the appended claims is to be interpreted in the broadest sense, thereby encompassing all such modifications and equivalent structures and functions.

Claims

1. A heat-treat-free aluminum alloy characterized by, The heat treatment-free aluminum alloy comprises the following components and the mass percentage of each component is: Si is 6.5-7.5%, Mg is 0.45-0.9%, Sn is 0.05-0.15%, Ti is 0.15-0.35%, Zn is 0.15-0.35%, Sr is 0.02-0.08%, Fe is 0.1-0.25%, Cu is 0.2-0.5%, Mo is 0.05-0.15%, V is 0.05-0.25%, Cr is 0.15-0.35%, Ce is 0.05-0.15%, Y is 0.03-0.15%, Gd is 0.05-0.2%, Dy is 0.05-0.25%, and the balance is Al and impurities, wherein the total amount of impurities is less than or equal to 0.3%.

2. The heat treatment free aluminum alloy of claim 1, wherein, The heat treatment-free aluminum alloy comprises the following components and the mass percentage of each component is: Si is 6.5-7.5%, Mg is 0.45-0.9%, Sn is 0.05-0.15%, Ti is 0.15-0.35%, Zn is 0.15-0.35%, Sr is 0.02-0.08%, Fe is 0.1-0.25%, Cu is 0.2-0.5%, Mo is 0.05-0.15%, V is 0.05-0.25%, Cr is 0.15-0.35%, Ce is 0.05-0.15%, Y is 0.03-0.15%, Gd is 0.05-0.2%, Dy is 0.05-0.25%, and the balance is Al and impurities, wherein the total amount of impurities is less than or equal to 0.3%.

3. The heat treatment free aluminum alloy of claim 1, wherein, The heat treatment-free aluminum alloy comprises the following components and the mass percentage of each component is: Si is 6.5-7.5%, Mg is 0.45-0.9%, Sn is 0.05-0.15%, Ti is 0.15-0.35%, Zn is 0.15-0.35%, Sr is 0.02-0.08%, Fe is 0.1-0.25%, Cu is 0.2-0.5%, Mo is 0.05-0.15%, V is 0.05-0.25%, Cr is 0.15-0.35%, Ce is 0.05-0.15%, Y is 0.03-0.15%, Gd is 0.05-0.2%, Dy is 0.05-0.25%, and the balance is Al and impurities, wherein the total amount of impurities is less than or equal to 0.3%.

4. The heat treatment free aluminum alloy of claim 1, wherein, The heat treatment-free aluminum alloy comprises the following components and the mass percentage of each component is: Si is 6.5-7.5%, Mg is 0.45-0.9%, Sn is 0.05-0.15%, Ti is 0.15-0.35%, Zn is 0.15-0.35%, Sr is 0.02-0.08%, Fe is 0.1-0.25%, Cu is 0.2-0.5%, Mo is 0.05-0.15%, V is 0.05-0.25%, Cr is 0.15-0.35%, Ce is 0.05-0.15%, Y is 0.03-0.15%, Gd is 0.05-0.2%, Dy is 0.05-0.25%, and the balance is Al and impurities, wherein the total amount of impurities is less than or equal to 0.3%.

5. The heat-treatable aluminium alloy according to any one of claims 1 to 4, wherein The raw material of Si is Al-Si intermediate alloy, the raw material of Mg is pure Mg, the raw material of Sn is Al-Sn intermediate alloy, the raw material of Ti is Al-Ti intermediate alloy, the raw material of Zn is Al-Zn intermediate alloy, the raw material of Sr is Al-Sr intermediate alloy, the raw material of Fe is Al-Fe intermediate alloy, the raw material of Cu is Al-Cu intermediate alloy, the raw material of Mo is Al-Mo intermediate alloy, the raw material of V is Al-V intermediate alloy, the raw material of Cr is Al-Cr intermediate alloy, the raw material of Ce is Al-Ce intermediate alloy, the raw material of Y is Al-Y intermediate alloy, the raw material of Gd is Al-Gd intermediate alloy, the raw material of Dy is Al-Dy intermediate alloy, and the raw material of Al is pure Al.

6. A method of producing a heat-treatable aluminium alloy, characterised in that, The method for preparing the non-heat-treated aluminum alloy according to any one of claims 1-5 comprises the following steps: Preheat industrial pure aluminum, pure magnesium and various required intermediate alloys at an environment of 200-220 ℃, and weigh the materials according to the mass percentage of the chemical composition of the alloy; Add a first material to a smelting furnace and perform a first alloying treatment and a first refining slag removal to obtain a first alloy melt; wherein the first material comprises pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, and Al-Cr intermediate alloy; Add a second material to the first alloy melt to perform a second alloying treatment and a second refining slag removal to obtain a second alloy melt; wherein the second material comprises pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, and Al-Dy intermediate alloy; Add a third material to the second alloy melt to perform a third alloying treatment and a third refining slag removal to obtain a third alloy melt; wherein the third material comprises Al-Sr intermediate alloy and Al-Ti intermediate alloy; Pass argon gas into the third alloy melt, and then perform smelting after standing to obtain a fourth alloy melt; Perform high-pressure die casting on the fourth alloy melt to obtain the non-heat-treated aluminum alloy.

7. The method of producing a heat-treatable aluminium alloy according to claim 6, c h a r a c t e r i s e d i n t h a t The temperature of the first alloying treatment is 750-770 ℃, the temperature of the second alloying treatment is 760-780 ℃, the temperature of the third alloying treatment is 730-750 ℃, the temperature of the smelting is 720-740 ℃, and the conditions of the high-pressure die casting include a temperature of 680-720 ℃, a pressure of 50-80 MPa, and an injection speed of 5.0-8.0 m / s.

8. The method of producing a heat-treatable aluminium alloy according to claim 7, c h a r a c t e r i s e d i n t h a t Further comprising: Preheat industrial pure aluminum, pure magnesium and various required intermediate alloys at an environment of 220 ℃, and weigh the above materials according to the mass percentage of the chemical composition of the alloy; adding a first material into a smelting furnace and performing a first alloying treatment and a first refining slagging at a temperature of 750 DEG C to obtain a first alloy melt; wherein the first material comprises pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, Al-Cr intermediate alloy; adding a second material into the first alloy melt and performing a second alloying treatment and a second refining slagging at a temperature of 760 DEG C to obtain a second alloy melt; wherein the second material comprises pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, Al-Dy intermediate alloy; adding a third material into the second alloy melt and performing a third alloying treatment and a third refining slagging at a temperature of 730 DEG C to obtain a third alloy melt; wherein the third material comprises Al-Sr intermediate alloy and Al-Ti intermediate alloy; continuously introducing argon into the third alloy melt for 5 minutes, and after standing for 30 minutes, performing smelting at a temperature of 720 DEG C to obtain a fourth alloy melt; performing high-pressure die casting of the fourth alloy melt at a temperature of 690 DEG C, a pressure of 60 MPa, and a shooting speed of 6.0 m / s to obtain the heat-treatment-free aluminum alloy; wherein the heat-treatment-free aluminum alloy comprises the following components and mass percentages: Si 7.0%, Mg 0.65%, Sn 0.10%, Ti 0.25%, Zn 0.25%, Sr 0.05%, Fe 0.15%, Cu 0.35%, Mo 0.10%, V 0.15%, Cr 0.25%, Ce 0.08%, Y 0.06%, Gd 0.10%, Dy 0.15%, and the balance of Al and impurities, wherein the total amount of impurities is less than or equal to 0.3%.

9. The method of producing a heat-treatable aluminum alloy according to claim 7, characterized in that, Further comprising: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at an environment of 210 DEG C, calculating and weighing the above materials according to the mass percentages of the chemical components of the alloys; adding a first material into a smelting furnace and performing a first alloying treatment and a first refining slagging at a temperature of 760 DEG C to obtain a first alloy melt; wherein the first material comprises pure Al, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Mo intermediate alloy, Al-V intermediate alloy, Al-Zn intermediate alloy, Al-Cr intermediate alloy; adding a second material into the first alloy melt and performing a second alloying treatment and a second refining slagging at a temperature of 770 DEG C to obtain a second alloy melt; wherein the second material comprises pure Mg, Al-Sn intermediate alloy, Al-Cu intermediate alloy, Al-Ce intermediate alloy, Al-Y intermediate alloy, Al-Gd intermediate alloy, Al-Dy intermediate alloy; adding a third material into the second alloy melt and performing a third alloying treatment and a third refining slagging at a temperature of 730 DEG C to obtain a third alloy melt; wherein the third material comprises Al-Sr intermediate alloy and Al-Ti intermediate alloy; adding a third material into the second alloy melt and performing a third alloying treatment and a third refining slag removal at a temperature of 740 DEG C to obtain a third alloy melt; wherein the third material comprises an Al-Sr intermediate alloy and an Al-Ti intermediate alloy; continuously blowing argon into the third alloy melt for 5 minutes, and after standing for 30 minutes, performing melting at a temperature of 730 DEG C to obtain a fourth alloy melt; performing high-pressure die casting of the fourth alloy melt at a temperature of 710 DEG C, a pressure of 70 MPa, and a ramming speed of 7.0 m / s to obtain the heat-treatment-free aluminum alloy; wherein the heat-treatment-free aluminum alloy comprises the following components and mass percentages of each component: Si 6.8%, Mg 0.7%, Sn 0.08%, Ti 0.20%, Zn 0.20%, Sr 0.03%, Fe 0.20%, Cu 0.25%, Mo 0.07%, V 0.20%, Cr 0.18%, Ce 0.06%, Y 0.10%, Gd 0.15%, and Dy 0.10%, wherein the total amount of impurities is ≤0.3%.

10. The method of producing a heat-treatable aluminum alloy according to claim 7, characterized in that, Further comprising: preheating industrial pure aluminum, pure magnesium, and various required intermediate alloys at an environment of 220 DEG C, calculating and weighing the above materials according to the mass percentages of the chemical components of the alloy; adding a first material into a melting furnace and performing a first alloying treatment and a first refining slag removal at a temperature of 770 DEG C to obtain a first alloy melt; wherein the first material comprises pure Al, an Al-Si intermediate alloy, an Al-Fe intermediate alloy, an Al-Mo intermediate alloy, an Al-V intermediate alloy, an Al-Zn intermediate alloy, and an Al-Cr intermediate alloy; adding a second material into the first alloy melt and performing a second alloying treatment and a second refining slag removal at a temperature of 780 DEG C to obtain a second alloy melt; wherein the second material comprises pure Mg, an Al-Sn intermediate alloy, an Al-Cu intermediate alloy, an Al-Ce intermediate alloy, an Al-Y intermediate alloy, an Al-Gd intermediate alloy, and an Al-Dy intermediate alloy; adding a third material into the second alloy melt and performing a third alloying treatment and a third refining slag removal at a temperature of 750 DEG C to obtain a third alloy melt; wherein the third material comprises an Al-Sr intermediate alloy and an Al-Ti intermediate alloy; continuously blowing argon into the third alloy melt for 5 minutes, and after standing for 30 minutes, performing melting at a temperature of 740 DEG C to obtain a fourth alloy melt; continuously blowing argon into the third alloy melt for 5 minutes, and after standing for 30 minutes, performing melting at a temperature of 740 DEG C to obtain a fourth alloy melt; The fourth alloy melt is high-pressure die cast at 700 DEG C, a pressure of 65 MPa, and a ramming speed of 6.50 m / s to obtain the heat treatment-free aluminum alloy; wherein the heat treatment-free aluminum alloy comprises the following components and the mass percentage of each component is as follows: Si is 7.2%, Mg is 0.58%, Sn is 0.12%, Ti is 0.18%, Zn is 0.28%, Sr is 0.06%, Fe is 0.15%, Cu is 0.37%, Mo is 0.07%, V is 0.20%, Cr is 0.18%, Ce is 0.06%, Y is 0.10%, Gd is 0.15%, and Dy is 0.10%, wherein the total amount of impurities is less than or equal to 0.3%.

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