Die-cast aluminum alloy that does not require heat treatment, its manufacturing method, and automotive structural parts

Abstract

To provide a heat-treatment-free die-cast aluminum alloy material, a preparation method thereof and an automobile structural member.SOLUTION: 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, and the balance of Al, where the metal M is one or both selected from Mn and Mo, based on the total weight of the die-cast aluminum alloy material. This composition improves the strength of the die-cast aluminum alloy material without applying heat treatment while also satisfying the performance requirements of an electrically driven housing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to the technical field of die-cast aluminum alloys, and particularly to die-cast aluminum alloys that do not require heat treatment, gold, their manufacturing methods, and automotive structural parts.

Background Art

[0002] With the increasing development of new energy vehicles, the requirements for lightweight and cost performance are becoming increasingly high. The die-casting process has welcomed many applications and research and development booms due to its advantages such as convenience, scale effect, lightweight, low cost, and high efficiency. However, conventional aluminum alloys can no longer meet people's current expectations for die-cast products.

[0003] Similarly, with the development of new energy vehicles, the electric drive industry has always been pursuing the ultimate output density, and as a result, ultimate requirements for lightweight and high output have been imposed. Thus, an electric drive housing using a high-strength die-cast aluminum alloy was born. With a high-strength and high-yield electric drive housing, the requirements of lightweight and high output can be simultaneously met. The lightweight effect can be achieved by the locally thin-wall design realized by high strength, and high strength can also meet the strength performance required by high output and high torque. For the output and torque requirements of some of the current highest-performance electric drives, it is even required that the yield strength performance of the main body of the electric drive housing be 210 MPa or more. Therefore, the development of high-strength aluminum alloys for electric drive housings is essential. Also, there are significant differences in the performance of test bars, the performance of flat dies, and the sampling performance of the main body of the electric drive housing. Therefore, in the actual development and simulation of electric drives, more attention needs to be paid to the performance of the main body of the electric drive housing. However, the performance requirements met by the current materials of electric drive housings are not based on the main body sampling.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This disclosure relates to die-cast aluminum alloy without heat treatment. gold A heat-treatment-free die-cast aluminum alloy that can improve strength and meet the performance requirements of the main body of an electrically driven housing. gold, The objective is to provide a method for manufacturing such a product, as well as automotive structural components. [Means for solving the problem]

[0005] To achieve the above objective, a first aspect of the present disclosure provides a heat-free die-cast aluminum alloy material, characterized in that, based on the total weight of the die-cast aluminum alloy material, the die-cast aluminum alloy material comprises 8.5 to 11.0 wt% Si, 0.2 wt% or less Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.2 to 0.8 wt% metal M, and the remainder Al, wherein the metal M is selected from at least one of Mn and Mo.

[0006] Selectively, based on the total weight of the die-cast aluminum alloy material, the die-cast aluminum alloy material comprises 8.5 to 10 wt% Si, 0.15 wt% or less Fe, 2.0 to 2.5 wt% Cu, 1.0 to 1.5 wt% Mg, 1.5 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.3 to 0.6 wt% metallic M, and the remainder Al.

[0007] The performance characteristics of the die-cast aluminum alloy material may be selected to include a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.3% or more, preferably including a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.4% or more.

[0008] A second aspect of this disclosure is a method for producing a heat-free die-cast aluminum alloy material as described in the first aspect of this disclosure, comprising the steps of: smelting an alloy raw material mixture in a smelting furnace to obtain a first alloy molten metal, wherein the alloy raw material mixture consists of: 8.5 to 11.0% by weight of Si, 0.2% by weight or less of Fe, 1.8 to 3.0% by weight of Cu, 1.0 to 2.0% by weight of Mg, 1.0 to 2.0% by weight of Zn, 0.1 to 0.3% by weight of Ti, 0.02 to 0.07% by weight of Sr, 0.03 to 0.06% by weight of Zr, and 0.2 to 0.8% by weight of metal M The present invention provides a method for producing a die-cast aluminum alloy material that does not require heat treatment, comprising: step S1, in which the metal M is selected from at least one of Mn and Mo; step S2, in which the first alloy molten metal is subjected to a degassing treatment, a refining treatment and a first slag removal treatment in a converter to obtain a second alloy molten metal; step S3, in which the second alloy molten metal is subjected to a heat retention treatment and a second slag removal treatment in a machine-side furnace to obtain a third alloy molten metal; and step S4, in which the third alloy molten metal is die-cast.

[0009] Selectively, in step S1, the conditions for the smelting process include a smelting temperature of 730 to 750°C and a smelting time of 1 to 10 hours, preferably including a smelting temperature of 740 to 750°C and a smelting time of 1 to 5 hours.

[0010] Optionally, in step S2, the conditions for the degassing treatment include a temperature of 710 to 720°C and a time of 10 to 15 min, preferably a temperature of 715 to 720°C and a time of 13 to 15 min, the conditions for the refining treatment include refining by adding a refining agent with stirring at 710 to 720°C and letting it stand for 10 to 20 minutes, and the first slag removal treatment includes removing floating slag using a slag removal tool.

[0011] Optionally, in step S3, the conditions for the heat retention treatment include a heat retention temperature of 650 to 670°C and a heat retention time of 0.1 to 10 hours, preferably a heat retention temperature of 658 to 662°C and a heat retention time of 0.1 to 0.5 hours, and the second slag removal treatment includes removing loose slag using a slag removal tool.

[0012] Optionally, in step S4, the conditions for the die-casting process include a casting pressure of 60 MPa or more, a high-speed of 4.5 m / s or more, a vacuum of 60 mbar or less, a molten aluminum temperature of 650 to 670°C, a temperature after mold spraying of 150°C or more, and an injection delay time of 1 s or less. Preferably, the conditions include a casting pressure of 60 to 80 MPa, a high-speed of 4.5 ± 0.1 m / s, a vacuum of 40 to 50 mbar, a molten aluminum temperature of 658 to 662°C, a temperature after mold spraying of 150 to 160°C, and an injection delay time of 1 ± 0.1 s.

[0013] Selectively, the method further includes: performing a first component detection process on the first alloy molten metal obtained in step S1, and if the result of the first component detection process satisfies a first condition, proceeding with the first alloy molten metal to step S2; performing a second component detection process on the second alloy molten metal obtained in step S2, and if the result of the second component detection process satisfies a second condition, proceeding with the second alloy molten metal to step S3; and performing a third component detection process on the third alloy molten metal obtained in step S3, and if the result of the third component detection process satisfies a third condition, proceeding with the third alloy molten metal to step S4.

[0014] The first, second, and third conditions are each independently comprising a composition of the molten alloy comprising 8.5 to 11.0 wt% Si, 0.2 wt% or less Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.2 to 0.8 wt% metal M, and the remainder Al, wherein metal M is selected from at least one of Mn and Mo.

[0015] A third aspect of this disclosure provides an automotive structural component comprising a heat-free die-cast aluminum alloy material as described in the first aspect of this disclosure or a heat-free die-cast aluminum alloy material manufactured by the manufacturing method described in the second aspect of this disclosure. [Effects of the Invention]

[0016] The above-described technology provides a heat-free die-cast aluminum alloy material, a method for manufacturing the same, and automotive structural components. This aluminum alloy material can meet the requirement of high strength without heat treatment, and its strength further improves over time until it stabilizes, avoiding the drawbacks of introducing heat treatment, such as decreased production efficiency, increased production costs, and unnecessary carbon emissions. The alloy material has high tensile strength, yield strength, and elongation, enabling the achievement of the ultimate output torque for electric drives. Furthermore, since the performance of the die-cast aluminum alloy material provided by this disclosure is all sampled from the body of the electric drive housing, it can meet the performance needs of the body of the electric drive housing, and the corrosion resistance of the die-cast aluminum alloy material is also improved to some extent, making it more suitable for application scenarios where the electric drive is located in the chassis.

[0017] Other features and advantages of this disclosure are described in detail in the following sections on specific embodiments. The drawings are provided for further understanding of this disclosure, constitute part of this specification, and are used to illustrate this disclosure together with the following specific embodiments, but are not limiting to this disclosure. [Brief explanation of the drawing]

[0018] [Figure 1] The flowchart of the process for manufacturing the heat-free die-cast aluminum alloy material of this disclosure is shown. [Figure 2] This disclosure shows a motor housing and sampling position for the main body of a die-cast aluminum alloy that does not require heat treatment. [Modes for carrying out the invention]

[0019] The following describes specific embodiments of this disclosure in detail, in conjunction with the drawings. The specific embodiments described herein are used solely for illustrative purposes and are not intended to limit this disclosure.

[0020] The inventors of the present disclosure have found that the currently developed high-strength aluminum alloy materials are developed based on the performance of tensile test bars, and this performance index has low reference value in the actual product development process, cannot represent the performance requirements necessary for the actual application situation, and the performance of the test bars further decays in terms of the body sampling performance of the actual product, and the degree of decay also varies depending on the housing sampling position and process parameters. Therefore, it is not appropriate for such performance to be the input for product development. Regarding the problems of the low strength performance of conventional aluminum alloys and the lack of corresponding body performance data, in the present disclosure, by controlling the content of each element in the alloy, especially the content of Fe (iron), Cu (copper), Mg (magnesium), Zn (zinc), etc., and adding fine particle strengthening elements such as Zr (zirconium), Ti (titanium), Sr (strontium), Mn (manganese), Mo (molybdenum), etc., a high-strength die-cast aluminum alloy that can achieve high yield strength, tensile strength and elongation rate of the body performance of the electric drive housing under the condition of not requiring heat treatment and can achieve the goal of the ultimate output torque of the electric drive has been developed.

[0021] The first aspect of the present disclosure provides a die-cast aluminum alloy material that does not require heat treatment. Based on the total weight of the die-cast aluminum alloy material, the die-cast aluminum alloy material contains 8.5 to 11.0 wt% of Si (silicon), 0.2 wt% or less of Fe (iron), 1.8 to 3.0 wt% of Cu (copper), 1.0 to 2.0 wt% of Mg (magnesium), 1.0 to 2.0 wt% of Zn (zinc), 0.1 to 0.3 wt% of Ti (titanium), 0.02 to 0.07 wt% of Sr (strontium), 0.03 to 0.06 wt% of Zr (zirconium), 0.2 to 0.8 wt% of metal M, and the balance Al (aluminum), and at least one of Mn (manganese) and Mo (molybdenum) is selected as the metal M.

[0022] In a specific embodiment, the content of Mn in the die-cast aluminum alloy material may be 0.2 to 0.7 wt%, and the content of Mo may be 0.02 to 0.1 wt%.

[0023] The present disclosure provides a die-cast aluminum alloy material that does not require heat treatment. The aluminum alloy material can meet the requirement of high strength without heat treatment. As the natural aging time elapses, the strength further improves until it stabilizes, avoiding drawbacks such as a decrease in production efficiency, an increase in production costs, and additional carbon emissions due to the introduction of heat treatment. The tensile strength, yield strength, and elongation rate of the alloy material are high, and the goal of the ultimate output torque of electric drive can be achieved. Furthermore, since all the performances of the die-cast aluminum alloy material provided by the present disclosure are sampled from the main body of the electric drive housing, it can meet the needs of the main body performance of the electric drive housing, and to some extent, the corrosion resistance of the die-cast aluminum alloy material is also improved, making it more suitable for the application scenario where the electric drive is located on the chassis.

[0024] In a specific embodiment, it is essential that several impurities such as Cr (chromium), Ni (nickel), Sn (tin), and Pb (lead) are introduced during the casting of the alloy. The total amount of impurities in the die-cast aluminum alloy material provided by the present disclosure is 0.25 wt% or less.

[0025] In the present disclosure, the Si content of the die-cast aluminum alloy material is 8.5 to 11.0 wt%, and the optimal value is around 9 wt%. This content range not only meets the requirement of a certain elongation rate of the main body of the motor housing and enables it to withstand impacts, but also can improve the strength of the die-cast aluminum alloy material to a high level.

[0026] By controlling the Fe content in the alloy material provided by the present disclosure to be 0.2 wt% or less, higher mechanical properties can be pursued, and when pursuing extremely high strength, the problem of a decrease in elongation rate can be solved.

[0027] By controlling the copper content in the alloys provided by this disclosure to 1.8 to 3.0% by weight, the corrosion resistance of the alloys of the present invention can be considered simultaneously, and can be made superior to that of ordinary alloys A380 and ADC12.

[0028] By controlling the magnesium content in the aluminum alloy material provided by this disclosure to a range of 1.0 to 2.0% by weight, the elongation can be controlled to meet the basic requirements of the motor housing, and then the strength can be improved as much as possible.

[0029] The aluminum alloy material provided by this disclosure has a zinc (Zn) content of 1.0 to 2.0% by weight, possesses good castability and mechanical properties, and can avoid the tendency of the alloy to undergo hot cracking as much as possible, while ensuring the corrosion resistance of the alloy material.

[0030] Regarding manganese (Mn), since manganese can change the sheet-like or needle-like crystalline structure of iron within the alloy into a precise crystalline shape, the presence of manganese in the aluminum alloy can mitigate the harmful effects of iron. Furthermore, although the iron content of this alloy is low, which is unfavorable for mold release, the addition of manganese can improve this phenomenon. On the other hand, if the manganese content in the alloy is high, segregation occurs. Therefore, by setting the manganese content in the aluminum alloy provided by this disclosure to 0.2 to 0.7% by weight, the adverse effects of iron in the alloy material can be reduced, and the segregation phenomenon caused by the high manganese content in the alloy can be avoided.

[0031] The zirconium content of the alloys provided by this disclosure is in the range of 0.03 to 0.06 wt%, and (Al,Si)3Zr particles are readily formed within the alloy, becoming heterogeneous nucleation sites for α-Al. This results in grain refinement and simultaneously improves the alloy strength and elongation.

[0032] By controlling the titanium content in the alloy provided by this disclosure to 0.1 to 0.3% by weight, it can play a role in fine-grained strengthening.

[0033] 0.02 to 0.07 wt% Sr in the alloy material provided by this disclosure can transform eutectic silicon from needle-like to fibrous.

[0034] In the alloy materials provided by this disclosure, Mo, Mn, and Mo elements, whose content is controlled to 0.02 to 0.1 wt%, primarily play a role in suppressing the formation of needle-like iron-rich phases, resulting in the generation of less harmful α-Al(Fe,Mn)Si or α-Al(Fe,Mo)Si phases within the alloy. These finely dispersed phases can improve the strength of the alloy.

[0035] In one preferred embodiment, based on the total weight of the die-cast aluminum alloy material, the die-cast aluminum alloy material comprises 8.5 to 10 wt% Si, 0.15 wt% or less Fe, 2.0 to 2.5 wt% Cu, 1.0 to 1.5 wt% Mg, 1.5 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.3 to 0.6 wt% metallic M, and the remainder Al. The blending ratio provided by this embodiment helps to further improve the performance of the die-cast aluminum alloy material.

[0036] In one specific embodiment, the Mn content in the die-cast aluminum alloy material is 0.3 to 0.6% by weight, and the Mo content is 0.02 to 0.03% by weight.

[0037] The performance characteristics of the die-cast aluminum alloy material include a yield strength of 220 MPa or higher, a tensile strength of 330 MPa or higher, and an elongation of 2.3% or higher, preferably including a yield strength of 226 MPa or higher, a tensile strength of 330 MPa or higher, and an elongation of 2.4% or higher. The performance characteristics of the die-cast aluminum alloy material provided by this disclosure can achieve the goal of ultimate output torque for electric drives.

[0038] In this disclosure, the body performance of a die-cast aluminum alloy material refers to the strength characteristics on the body of the part obtained by taking a tensile sample that meets the requirements from the part actually used and performing a tensile test. Body sampling may be performed by the following method: First, the body of the part is obtained by a die-casting process, the area that will be used for the tensile sample is marked, the marked sample block is then obtained by cutting, and a standard tensile sample is obtained by slowly cutting the sample block by wire cutting.

[0039] A second aspect of this disclosure provides a method for manufacturing a heat-free die-cast aluminum alloy material as described in the first aspect of this disclosure. As shown in Figure 1, the method for manufacturing a die-cast aluminum alloy material that does not require heat treatment is as follows: Step S1 is to smelt an alloy raw material mixture in a smelting furnace to obtain a first molten alloy, wherein the alloy raw material mixture consists of 8.5 to 11.0 wt% Si, 0.2 wt% or less Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, and 0.03 to 0.06 wt% Z The process includes: step S1, comprising r, 0.2 to 0.8 wt% of metal M and the remainder Al, wherein metal M is selected from at least one of Mn and Mo; step S2, performing a degassing treatment, a refining treatment and a first slag removal treatment on the first molten alloy in a converter to obtain a second molten alloy; step S3, performing a heat retention treatment and a second slag removal treatment on the second molten alloy in a machine-side furnace to obtain a third molten alloy; and step S4, die-casting the third molten alloy.

[0040] The manufacturing method provided by this disclosure makes it possible to obtain high-strength aluminum alloy material without heat treatment, thereby avoiding the drawbacks of introducing heat treatment, such as decreased production efficiency, increased production costs, and unnecessary carbon emissions.

[0041] The alloy material produced by this disclosure is a low-iron alloy and requires melting the alloy ingot using smelting equipment (including smelting furnaces, converters, mechanical furnaces, etc.) (or cleaning the furnace, subject to passing component detection). The smelting equipment has a standard structure in the art.

[0042] In a preferred embodiment, the alloy raw material mixture comprises 8.5 to 10 wt% Si, 0.15 wt% or less Fe, 2.0 to 2.5 wt% Cu, 1.0 to 1.5 wt% Mg, 1.5 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.3 to 0.6 wt% metallic M, and the remainder Al.

[0043] In one embodiment, step S1 includes smelting conditions such as a smelting temperature of 730 to 750°C and a smelting time of 1 to 10 hours, preferably a smelting temperature of 740 to 750°C and a smelting time of 1 to 5 hours. Optionally, the atmosphere in the smelting furnace may be a protective atmosphere (e.g., nitrogen) or air.

[0044] In one embodiment, step S2 includes degassing conditions of a temperature of 710 to 720°C and a time of 10 to 15 min, preferably a temperature of 715 to 720°C and a time of 13 to 15 min, and smelting conditions include smelting with stirring at 710 to 720°C and letting it stand for 10 to 20 minutes, where the smelting agent is of a type commonly selected in the art and available through normal commercial purchasing routes, and the first slag removal treatment includes removing floating slag using a slag removal tool.

[0045] In one embodiment, step S3 includes conditions for the heat retention treatment, where the heat retention temperature is 650 to 670°C and the heat retention time is 0.1 to 10 hours, preferably 658 to 662°C and the heat retention time is 0.1 to 0.5 hours, and the second slag removal treatment includes removing loose slag using a slag removal tool. Optionally, the atmosphere for the heat retention treatment includes a protective atmosphere (e.g., nitrogen) or air.

[0046] In one embodiment, step S4 includes the following conditions for die casting: casting pressure of 60 MPa or more, high speed of 4.5 m / s or more, vacuum of 60 mbar or less, molten aluminum temperature of 650 to 670°C, temperature after mold spray of 150°C or more, and injection delay time of 1 s or less.

[0047] Preferably, the casting pressure is 60 to 80 MPa, the high-speed is 4.5 ± 0.1 m / s, the vacuum is 40 to 50 mbar, the molten aluminum temperature is 658 to 662 °C, the temperature after mold spraying is 150 to 160 °C, and the injection delay time is 1 ± 0.1 s. The preston number used in this disclosure is 3000 tons or more.

[0048] In one specific embodiment, the method further includes the steps of: performing a first component detection process on the first molten alloy obtained in step S1, and if the result of the first component detection process satisfies a first condition, proceeding to step S2 with the first molten alloy; performing a second component detection process on the second molten alloy obtained in step S2, and if the result of the second component detection process satisfies a second condition, proceeding to step S3 with the second molten alloy; and performing a third component detection process on the third molten alloy obtained in step S3, and if the result of the third component detection process satisfies a third condition, proceeding to step S4 with the third molten alloy.

[0049] Selectively, the first, second, and third conditions each independently include a composition of the molten alloy comprising 8.5 to 11.0 wt% Si, up to 0.2 wt% Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, 0.2 to 0.8 wt% metallic M, and the remainder being Al, wherein metallic M is selected from either or both Mn and Mo. This disclosure makes it possible to ensure that the composition of the final alloy material meets the requirements by performing component detection on the molten alloy obtained at each step during manufacturing.

[0050] A third aspect of this disclosure provides an automotive structural component including a die-cast aluminum alloy material, wherein the die-cast aluminum alloy material is a heat-free die-cast aluminum alloy material as described in the first aspect of this disclosure or a heat-free die-cast aluminum alloy material manufactured by the manufacturing method described in the second aspect of this disclosure.

[0051] Furthermore, automotive structural components include, but are not limited to, parts formed by die casting that themselves require high strength and high yield strength, and include electric drive components such as motor housings, motor end covers, and gearbox housings. As shown in Figure 2, in the motor housing structure shown in Figure 2, the main body sampling position 1 is located on the motor housing.

[0052] The present invention will be described in detail below through examples. All raw materials used in the examples are available through commercial purchasing channels.

[0053] (Example 1) This embodiment involves the production of an aluminum alloy material according to the alloy raw material composition shown in Table 1, and the conditions include the following: This alloy is a low-iron alloy and requires the use of specialized smelting equipment (including smelting furnaces, converters, and mechanical furnaces) to melt the alloy ingots (or, provided that the furnace passes the component detection test, the furnaces must be cleaned). (1) Place the prepared alloy ingot into a smelting furnace, set the smelting temperature to 750°C and the smelting time to 3h, and detect whether it is completely melted and whether its components meet the requirements (a small amount of the molten material is scooped out, allowed to solidify, and then detected by the OES (Optical Emission Spectrum) component detection method). If it passes the test, proceed to the next step. (2) The molten alloy is transferred to a converter for degassing, refining, and slag removal. The conditions for the degassing process include a temperature of 720°C and a time of 15 min. The conditions for the refining process include adding a refining agent and refining at a temperature of 720°C while gently and uniformly stirring, letting it stand for 15 minutes, then removing the floating slag using a slag removal tool, detecting whether the composition meets the requirements, and proceeding to the next step if it passes. (3) The molten alloy from the converter is transferred to the machine-side furnace, kept warm, and slag is removed. The warming temperature is 660°C and the warming time is 0.1 hours. The composition is then checked to see if it meets the requirements. After passing the check, the following procedure is performed. (4) Die casting is performed, and the die casting parameters are shown in Table 2 below.

[0054] (From Example 2) Examples 2 to 5 refer to the manufacturing method in Example 1, with the only difference being that the aluminum alloy material is manufactured according to the alloy raw material composition shown in Table 1, while the remaining process is the same as in Example 1.

[0055] (Example 6) In this example, an alloy raw material mixture was prepared according to the raw material formulation in Example 1, and the difference from Example 1 is the following change in manufacturing process conditions. (1) Place the prepared alloy ingot into a smelting furnace, set the smelting temperature to 730°C and the smelting time to 10 hours, and after it has completely melted and the composition has been detected to see if it meets the requirements, proceed to the next step. (2) The molten alloy is transferred to a converter for degassing, refining, and slag removal. The conditions for the degassing process include a temperature of 710°C and a time of 10 min. The conditions for the refining process include adding a refining agent and refining at a temperature of 720°C while gently and uniformly stirring, letting it stand for 15 minutes, then removing the floating slag using a slag removal tool, detecting whether the composition meets the requirements, and proceeding to the next step if it passes. (3) The molten alloy from the converter is transferred to the machine-side furnace, kept warm, and slag removal is performed. The warming temperature is 670°C and the warming time is 10 hours. The temperature is then checked to see if the composition meets the requirements. After passing the check, the following procedure is performed. (4) Die casting is performed, and the die casting parameters are shown in Table 3 below.

[0056] (Example 7) Example 7 follows the manufacturing method of Example 1, with the only difference being that the aluminum alloy material is manufactured according to the alloy raw material composition shown in Table 1, while the rest of the process is the same as in Example 1.

[0057] (Comparative Example 1) Referring to the manufacturing method in Example 1, the only difference from Example 1 is that the aluminum alloy material is manufactured according to the alloy raw material composition shown in Table 1, while the remaining process is the same as in Example 1.

[0058] (Comparative Example 2) Please refer to the manufacturing method in Example 1. The difference from Example 1 is that the aluminum alloy material is manufactured according to the alloy raw material composition shown in Table 1, and the remaining process is the same as in Example 1.

[0059] (Comparative Example 3) This is a die-cast aluminum alloy material manufactured by referring to the method disclosed in Example 1 of Chinese Patent Application Publication No. 115961186.

[0060] (Comparative Example 4) This is an aluminum alloy material manufactured by referring to the method disclosed in Example 3 of Chinese Patent Application Publication No. 104831129.

[0061] (Comparative Example 5) This is an aluminum alloy material manufactured by referring to the method disclosed in Example 6 of Chinese Patent Application Publication No. 105463269.

[0062] (Comparative Example 6) An aluminum alloy material manufactured by reference to the method disclosed in Example 1 of Chinese Patent Application Publication No. 105316542.

[0063] (Comparative Example 7) This is an aluminum alloy material manufactured by referring to the method disclosed in Example 1 of Chinese Patent Application Publication No. 107829000.

[0064] [Table 1]

[0065] [Table 2]

[0066] [Table 3]

[0067] (Test Example 1) This test example is used to perform mechanical performance tests by taking body samples of products manufactured according to the above examples and comparative examples.

[0068] The method for sampling the main body involves first obtaining the main body of the part by die-casting, marking the area that will be used for the tensile sample, then obtaining the marked sample block by cutting, and finally obtaining a standard tensile sample from the sample block using the slow wire cut method. The sample specifications are for a small-sized test in accordance with ASTM E8, with a thickness of approximately 5 mm to 6 mm, which is the actual thickness of the main body, and such a tensile sample will be used.

[0069] The test methods for yield strength, tensile strength, and elongation of the main sample refer to the room temperature test method in Part 1 of the standard GB / T 228.1-2021, Metallic Materials, Tensile Tests. The test results are shown in Table 4 below.

[0070] [Table 4]

[0071] From the data in Table 4 above, the following can be seen: As can be seen from the comparison between Examples 1 to 6 and Comparative Examples 1 and 2, in Comparative Examples 1 and 2, alloy production was carried out without adopting the raw material mixing ratios provided in this disclosure. As a result, the resulting cast aluminum alloy materials had poor yield strength, tensile strength, and elongation. This indicates that the body performance of the heat-free die-cast aluminum alloy materials produced by the method provided in this disclosure is superior.

[0072] As can be seen from a comparison between Examples 1 to 6 and Comparative Examples 2 to 7, in Examples 1 to 6, the heat-free die-cast aluminum alloy materials manufactured by the method provided by this disclosure have higher yield strength and tensile strength, provided that a relatively high elongation is maintained.

[0073] As can be seen from a comparison between Example 1 and Example 6, in Example 1, the aluminum alloy material manufactured under the optimized process conditions provided by this disclosure has higher yield strength, tensile strength, and elongation.

[0074] As can be seen from a comparison between Examples 1 to 5 and Example 7, the composition of the aluminum alloy materials produced in Examples 1 to 5 is within the optimized content range of this disclosure, and the yield strength, tensile strength, and elongation of the aluminum alloy materials obtained in Examples 1 to 5 are higher.

[0075] The above describes preferred embodiments of the present disclosure in detail in conjunction with the drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical proposals of the present disclosure within the scope of the technical concept of the present disclosure, and all such simple modifications fall within the scope of protection of the present disclosure.

[0076] Furthermore, each specific technical feature described in the above specific embodiments can be combined in any suitable manner, as long as they do not contradict each other, and in order to avoid unnecessary repetition, this disclosure omits various possible combinations.

[0077] Furthermore, it is possible to combine different embodiments of this disclosure as desired, and such combinations should be considered as being disclosed in this disclosure, provided they do not contradict the spirit of this disclosure. [Explanation of symbols]

[0078] 1. Main unit sampling position

Claims

1. A die-cast aluminum alloy that does not require heat treatment, Based on the total weight of the die-cast aluminum alloy, the die-cast aluminum alloy is, It contains 8.5 to 11.0 wt% Si, 0.2 wt% or less Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, and 0.2 to 0.8 wt% metal M, with the remainder being Al and unavoidable impurities, wherein metal M is selected from both Mn and Mo. The die-cast aluminum alloy described above is characterized in that its main body performance includes a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation of 2.3% or more, and is a heat-treatment-free die-cast aluminum alloy.

2. Based on the total weight of the die-cast aluminum alloy, the die-cast aluminum alloy is: The die-cast aluminum alloy according to claim 1, characterized in that it contains 8.5 to 10 wt% Si, 0.15 wt% or less Fe, 2.0 to 2.5 wt% Cu, 1.0 to 1.5 wt% Mg, 1.5 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, and 0.3 to 0.6 wt% metallic M, with the remainder being Al and unavoidable impurities.

3. The die-cast aluminum alloy according to claim 1, characterized in that the yield strength is 226 MPa or more, the tensile strength is 330 MPa or more, and the elongation is 2.4% or more.

4. A method for manufacturing a die-cast aluminum alloy that does not require heat treatment, according to any one of claims 1 to 3, Step S1 is a step of obtaining a first molten alloy by smelting an alloy raw material mixture in a smelting furnace, wherein the alloy raw material mixture contains 8.5 to 11.0 wt% Si, 0.2 wt% or less Fe, 1.8 to 3.0 wt% Cu, 1.0 to 2.0 wt% Mg, 1.0 to 2.0 wt% Zn, 0.1 to 0.3 wt% Ti, 0.02 to 0.07 wt% Sr, 0.03 to 0.06 wt% Zr, and 0.2 to 0.8 wt% metal M, with the remainder being Al and unavoidable impurities, and the metal M is selected from both Mn and Mo. Step S2 involves performing a degassing treatment, a refining treatment, and a first slag removal treatment on the first alloy molten metal in a converter to obtain a second alloy molten metal. Step S3 involves performing a heat retention treatment and a second slag removal treatment on the second alloy molten metal in a machine-side furnace to obtain a third alloy molten metal. A method for producing a die-cast aluminum alloy that does not require heat treatment, characterized by comprising step S4 of die-casting the molten third alloy.

5. The method for producing a die-cast aluminum alloy without heat treatment according to claim 4, characterized in that in step S1, the conditions for the smelting process include a smelting temperature of 730 to 750°C and a smelting time of 1 to 10 hours, or a smelting temperature of 740 to 750°C and a smelting time of 1 to 5 hours.

6. In step S2, the conditions for the degassing treatment include a temperature of 710 to 720°C and a time of 10 to 15 mins, or a temperature of 715 to 720°C and a time of 13 to 15 mins. The conditions for the aforementioned refining process include adding a refining agent while stirring at a temperature of 710 to 720°C, and letting it stand for 10 to 20 minutes. The method for producing a die-cast aluminum alloy without heat treatment according to claim 4, characterized in that the first slag removal treatment includes removing floating slag using a slag removal tool.

7. In step S3, the conditions for the heat retention treatment include a heat retention temperature of 650 to 670°C and a heat retention time of 0.1 to 10 hours, or a heat retention temperature of 658 to 662°C and a heat retention time of 0.1 to 0.5 hours. The method for producing a die-cast aluminum alloy without heat treatment according to claim 4, characterized in that the second slag removal treatment includes removing floating slag using a slag removal tool.

8. In step S4, the conditions for the die-casting process include a casting pressure of 60 MPa or more, a high-speed of 4.5 m / s or more, a vacuum of 60 mbar or less, a molten aluminum temperature of 650 to 670°C, a temperature after mold spraying of 150°C or more, and an injection delay time of 1 s or less. Alternatively, the method for producing a die-cast aluminum alloy without heat treatment according to claim 4, characterized in that the casting pressure is 60 to 80 MPa, the high-speed rate is 4.5 ± 0.1 m / s, the vacuum level is 40 to 50 mbar, the molten aluminum temperature is 658 to 662°C, the temperature after mold spraying is 150 to 160°C, and the injection delay time is 1 ± 0.1 s.

9. The first molten alloy obtained in step S1 is subjected to a first component detection process, and if the result of the first component detection process satisfies the first condition, the first molten alloy is advanced to step S2. The second molten alloy obtained in step S2 is subjected to a second component detection process, and if the result of the second component detection process satisfies the second condition, the second molten alloy is advanced to step S3. The process further includes: performing a third component detection treatment on the molten third alloy obtained in step S3, and if the result of the third component detection treatment satisfies the third condition, proceeding to step S4 with the molten third alloy; The method for producing a die-cast aluminum alloy without heat treatment according to claim 4, characterized in that the first, second, and third conditions are each independently such that the composition of the molten alloy contains 8.5 to 11.0% by weight of Si, 0.2% by weight or less of Fe, 1.8 to 3.0% by weight of Cu, 1.0 to 2.0% by weight of Mg, 1.0 to 2.0% by weight of Zn, 0.1 to 0.3% by weight of Ti, 0.02 to 0.07% by weight of Sr, 0.03 to 0.06% by weight of Zr, and 0.2 to 0.8% by weight of metal M, with the remainder being Al and unavoidable impurities, and the metal M is selected from both Mn and Mo.

10. An automotive structural component characterized by comprising a heat-treatment-free die-cast aluminum alloy as described in any one of claims 1 to 3.

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