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

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-casting aluminum alloys, and in particular to a heat-treatment-free die-casting aluminum alloy material, its manufacturing method, and automotive structural parts. [Background technology]

[0002] With the increasing development of new energy vehicles, the requirements for weight reduction and cost performance are becoming higher and higher, and the die casting process has seen many applications and a boom in research and development due to its advantages such as convenience, scale effect, weight reduction, low cost, and high efficiency. However, traditional aluminum alloys can no longer meet people's current expectations for die casting products.

[0003] Similarly, with the development of new energy vehicles, the electric drive industry is constantly pursuing the ultimate power density, which imposes the ultimate requirements for light weight and high power. This resulted in the creation of electric drive housings using high-strength die-cast aluminum alloys. The high-strength, high-yield electric drive housings can simultaneously meet the requirements of light weight and high power, and the local thin-wall design realized by high strength can achieve the effect of light weight, while the high strength can also meet the strength performance required by high power and high torque. The power and torque requirements of some of the current highest performance electric drives even require the yield strength performance of the body of the electric drive housing to be 210 MPa or more. Therefore, it is essential to develop high-strength aluminum alloys for electric drive housings. In addition, there is a large difference between the performance of the test bar, the performance of the flat die, and the main body sampling performance of the electric drive housing, so in the development and simulation of actual electric drives, more attention needs to be paid to the main body performance of the electric drive housing. However, the performance requirements met by the materials of the electric drive housing at present are not based on the main body sampling. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide a die-cast aluminum alloy material that does not require heat treatment, which can improve the strength of the die-cast aluminum alloy material without heat treatment and can meet the main body performance needs of an electric drive housing, a manufacturing method thereof, and an automobile structural part. [Means for solving the problem]

[0005] In order to achieve the above object, a first aspect of the present disclosure provides a die-cast aluminum alloy material that does not require heat treatment, the die-cast aluminum alloy material comprising, based on a total weight of the die-cast aluminum alloy material, 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 balance Al, wherein the metal M is selected from at least one of Mn and Mo.

[0006] Optionally, based on a total weight of the die cast aluminum alloy material, the die cast aluminum alloy material comprises 8.5 to 10 wt.% Si, up to 0.15 wt.% 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.% M metal, and the balance Al.

[0007] Optionally, the body performance of the die-casting aluminum alloy material includes a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation rate of 2.3% or more, and preferably includes a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation rate of 2.4% or more.

[0008] A second aspect of the present disclosure is a method for producing a heat-treatment-free die-cast aluminum alloy material according to the first aspect of the present disclosure, comprising the steps of smelting an alloy raw material mixture in a smelting furnace to obtain a first molten alloy, the alloy raw material mixture being 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.% Mn ... and the balance Al, wherein the metal M is selected from at least one of Mn and Mo; step S2 of 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 of 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 of die-casting the third molten alloy.

[0009] Optionally, in step S1, the smelting treatment conditions include a smelting temperature of 730 to 750° C. and a smelting time of 1 to 10 h, and preferably, the smelting temperature of 740 to 750° C. and the smelting time of 1 to 5 h.

[0010] Optionally, in step S2, the degassing treatment conditions include a temperature of 710 to 720°C and a time of 10 to 15 minutes, preferably the temperature is 715 to 720°C and the time is 13 to 15 minutes, the refining treatment conditions include refining by adding a refining agent while stirring at 710 to 720°C and leaving it 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 of 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, the heat retention temperature of 658 to 662°C and the heat retention time of 0.1 to 0.5 hours, and the second slag removal treatment includes removing floating slag using a slag removal tool.

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

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

[0014] Optionally, the first condition, the second condition, and the third condition each independently include 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 balance Al, wherein the metal M is selected from at least one of Mn and Mo.

[0015] A third aspect of the present disclosure provides an automobile structural part comprising the heat treatment-free die-cast aluminum alloy material according to the first aspect of the present disclosure or the heat treatment-free die-cast aluminum alloy material produced by the production method according to the second aspect of the present disclosure. Effect of the Invention

[0016] According to the above technical solution, the present disclosure provides a die-casting aluminum alloy material and its manufacturing method, and an automobile structural part that does not require heat treatment, and the aluminum alloy material can meet the requirement of high strength without heat treatment, and the strength is further improved until stable with the natural aging time, avoiding the disadvantages of reduced production efficiency, increased production costs, and unnecessary carbon emissions caused by the introduction of heat treatment, and the alloy material has high tensile strength, yield strength, and elongation, and can achieve the goal of the ultimate output torque of the electric drive. In addition, the performance of the die-casting aluminum alloy material provided by the present disclosure is all sampled from the main body of the electric drive housing, so that the performance needs of the main body of the electric drive housing can be met, and the corrosion resistance of the die-casting aluminum alloy material is also improved to a certain extent, making it more suitable for the application scenario of the electric drive being located in the chassis.

[0017] Other features and advantages of the present disclosure are described in detail in the following specific embodiments section. The drawings are provided to provide a further understanding of the present disclosure, constitute a part of this specification, and are used to explain, but not to limit, the present disclosure together with the following specific embodiments. [Brief description of the drawings]

[0018] [Figure 1] 1 shows a process flow chart of the manufacturing method of the present disclosure of a heat treatment-free die-cast aluminum alloy material. [Diagram 2] 1 shows the motor housing and sampling locations for body sampling of the heat treat-free die cast aluminum alloy of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, specific embodiments of the present disclosure will be described in detail in conjunction with the drawings. Note that the specific embodiments described herein are used only to describe the present disclosure and are not intended to limit the present disclosure.

[0020] The inventor of the present disclosure 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 little reference value in the actual product development process, cannot represent the performance requirements required for actual application situations, and the performance of the test bars is further attenuated in the main body sampling performance of the actual product, and the degree of attenuation also varies depending on the housing sampling position and process parameters, so this performance should not be used as an input for product development. Regarding the problem of the low strength performance of traditional aluminum alloys and the lack of corresponding main body performance data, the present disclosure has developed a high-strength die-cast aluminum alloy that can achieve high yield strength, tensile strength and elongation of the main body performance of electric drive housing under conditions without heat treatment, 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), and Mo (molybdenum).

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

[0022] In one specific embodiment, the Mn content in the die casting aluminum alloy material may be 0.2 to 0.7 wt %, and the Mo content 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, and the strength will be further improved until stable with the passage of natural aging time, avoiding the disadvantages of reduced production efficiency, increased production costs, and extra carbon emissions caused by the introduction of heat treatment, and the alloy material has high tensile strength, yield strength, and elongation, and can achieve the goal of the ultimate output torque of the electric drive. In addition, the performance of the die-cast aluminum alloy material provided by the present disclosure is all sampled from the main body of the electric drive housing, so that the main body performance needs of the electric drive housing can be met, and the corrosion resistance of the die-cast aluminum alloy material is also improved to a certain extent, making it more suitable for the application scene where the electric drive is located in the chassis.

[0024] In a specific embodiment, it is essential that some impurities such as Cr (chromium), Ni (nickel), Sn (tin), Pb (lead) are introduced during casting of the alloy, and the total amount of impurities in the die-casting 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-casting aluminum alloy material is 8.5 to 11.0 wt%, and the optimum value is around 9 wt%. This content range can not only meet the certain elongation requirement of the body of the motor housing and provide it with the ability to withstand impact, but also improve the strength of the die-casting 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, it is possible to pursue higher mechanical performance and to solve the problem of reduced elongation when extremely high strength is pursued.

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

[0028] By controlling the magnesium content in the aluminum alloy material provided by the present disclosure within the range of 1.0 to 2.0 wt%, it is possible to improve the strength as much as possible after controlling the elongation to meet the basic requirements of the motor housing.

[0029] The zinc (Zn) content in the aluminum alloy material provided by the present disclosure is 1.0 to 2.0 wt.%, which has good castability and mechanical properties, while minimizing the tendency of the alloy to hot crack as much as possible and ensuring the corrosion resistance of the alloy material.

[0030] Regarding manganese (Mn), manganese can change the sheet or needle-like crystal structure of iron in the alloy into a precise crystal shape, so the presence of manganese in the aluminum alloy can reduce the harmful effects of iron. In addition, the iron content of the alloy is low, which is unfavorable for demolding, but the addition of manganese can improve this phenomenon. On the other hand, if the manganese content in the alloy is high, segregation will occur, so by making the manganese content in the aluminum alloy provided by the present disclosure 0.2 to 0.7 wt.%, the harmful 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 alloy provided by the present disclosure is in the range of 0.03 to 0.06 wt.%, which makes it easy to form (Al,Si)3Zr particles in the alloy and serves as heterogeneous nucleation points for α-Al, thereby refining the grains and improving the strength and elongation of the alloy at the same time.

[0032] Controlling the titanium content in the alloys provided by the present disclosure to 0.1 to 0.3 wt.% can play a role in grain strengthening.

[0033] 0.02 to 0.07 wt. % Sr in the alloy material provided by the present disclosure can change the eutectic silicon from acicular to fibrous.

[0034] In the alloy material provided by the present disclosure, Mo, Mn and Mo elements, the content of which is controlled to be 0.02 to 0.1 wt%, mainly play a role in suppressing the formation of needle-like iron-rich phase, and generate less harmful α-Al(Fe,Mn)Si or α-Al(Fe,Mo)Si phase in the alloy, and these fine dispersed phases can improve the strength of the alloy.

[0035] In a preferred embodiment, based on the total weight of the die-casting aluminum alloy material, the die-casting aluminum alloy material includes 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% metal M, and the balance Al. The blending ratio provided by this embodiment is useful for further improving the performance of the die-casting aluminum alloy material.

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

[0037] The body performance of the die-casting aluminum alloy material includes a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation rate of 2.3% or more, and preferably includes a yield strength of 226 MPa or more, a tensile strength of 330 MPa or more, and an elongation rate of 2.4% or more. The body performance of the die-casting aluminum alloy material provided by the present disclosure can achieve the goal of the ultimate output torque of the electric drive.

[0038] In this disclosure, the body performance of die-casting aluminum alloy material refers to the strength properties on the part body obtained by taking a tensile sample that meets the requirements from the part actually used and carrying out a tensile test. The body sampling may be carried out in the following manner: first, obtain the part body by the die-casting process, mark the area that meets the tensile sample, then obtain the marked sample block by cutting, and slowly cut out the above sample block by wire cutting to obtain a standard tensile sample.

[0039] A second aspect of the present disclosure provides a method for producing the heat treatment-free die-cast aluminum alloy material according to the first aspect of the present disclosure. As shown in FIG. 1, the method for producing a die-cast aluminum alloy material that does not require heat treatment includes a step S1 of smelting an alloy raw material mixture in a smelting furnace to obtain a first molten alloy, the alloy raw material mixture containing 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.% Z, and % of a metal M and the remainder Al, where the metal M is selected from at least one of Mn and Mo; step S2 of performing a degassing treatment, a refining treatment, and a first slag removal treatment on the first molten alloy in the converter to obtain a second molten alloy; step S3 of performing a heat retention treatment and a second slag removal treatment on the second molten alloy in the machine-side furnace to obtain a third molten alloy; and step S4 of die-casting the third molten alloy.

[0040] The manufacturing method provided by the present disclosure can obtain a high-strength aluminum alloy material without heat treatment, and can avoid disadvantages such as reduced production efficiency, increased production costs, and unnecessary carbon emissions that are caused by the introduction of heat treatment.

[0041] The alloy material produced by the present disclosure is a low-iron alloy, and requires the use of smelting equipment (including smelting furnaces, converters, machine-side furnaces, etc.) to melt the alloy ingots (or to perform furnace cleaning operations on the condition that the alloy passes component detection). The smelting equipment is a conventional equipment structure in the art.

[0042] In one preferred embodiment, the alloy raw material mixture comprises 8.5 to 10 wt.% Si, up to 0.15 wt.% 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.% M metal and the balance Al.

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

[0044] In one embodiment, in step S2, the degassing treatment conditions 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, and the refining treatment conditions include adding a refining agent under stirring at 710 to 720° C. and leaving for 10 to 20 minutes, where the refining agent is of a type commonly selected in the art and is available through a common commercial purchase channel, and the first slag removal treatment includes removing floating slag using a slag removal tool.

[0045] In one embodiment, in step S3, the conditions of the heat-holding treatment include a heat-holding temperature of 650 to 670° C. and a heat-holding time of 0.1 to 10 h, preferably a heat-holding temperature of 658 to 662° C. and a heat-holding time of 0.1 to 0.5 h, and the second slag removal treatment includes removing the floating slag using a slag removal tool. Optionally, the atmosphere of the heat-holding treatment includes a protective atmosphere (e.g., nitrogen) or air.

[0046] In one embodiment, in step S4, the conditions of 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 degree 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.

[0047] The preferred 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 the mold spray of 150 to 160° C., and an injection delay time of 1±0.1 s. The press tonnage used in the present disclosure is 3000 Ton or more.

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

[0049] Optionally, the first condition, the second condition, and the third condition each independently include a composition of the molten alloy including 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 balance Al, where metal M is one or both selected from Mn and Mo. The present disclosure can 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 production.

[0050] A third aspect of the present disclosure provides an automotive structural component comprising a die-cast aluminum alloy material, the die-cast aluminum alloy material being the heat treatment-free die-cast aluminum alloy material according to the first aspect of the present disclosure or the heat treatment-free die-cast aluminum alloy material produced by the production method according to the second aspect of the present disclosure.

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

[0052] The present invention will be described in detail with reference to the following examples. All the raw materials used in the examples are available through commercial purchase channels.

[0053] Example 1 In this embodiment, an aluminum alloy material is produced according to the composition of the alloy raw materials shown in Table 1, and the conditions include the following: The alloy is a low-iron alloy, and requires the alloy ingot to be melted using dedicated smelting equipment (including smelting furnaces, converters, machine-side furnaces, etc.) (or furnace cleaning operations must be performed, provided that the alloy passes elemental detection). (1) Put the prepared alloy ingot into a smelting furnace, set the smelting temperature at 750℃ and the smelting time at 3h, and check whether the alloy ingot completely melts and its composition meets the requirements (scoop out a small amount of the molten material, solidify it, and then use OES (optical emission spectroscopy) composition detection method to detect it). If it passes the requirements, proceed to the next procedure. (2) The molten alloy is transferred to a converter for degassing, refining and deslag removal, where the degassing treatment conditions include a temperature of 720°C and a time of 15 minutes. The refining treatment conditions are to add refining agents to refine the alloy under a temperature of 720°C while stirring lightly and uniformly, and then leave the alloy for 15 minutes. Then, use a slag removal tool to remove the floating slag. Check whether the composition meets the requirements. After passing the requirements, proceed to the next procedure. (3) The molten alloy from the converter is transferred to the machine-side furnace, where it is kept warm and the slag is removed. The keeping temperature is 660°C and the keeping time is 0.1h. It is checked whether the composition meets the requirements. After passing the requirements, the next procedure is carried out. (4) Die casting was 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, and the difference with Example 1 is that the aluminum alloy material is manufactured according to the composition of the alloy raw materials shown in Table 1, and the remaining processes are the same as those of Example 1.

[0055] Example 6 In this example, an alloy raw material mixture was prepared according to the raw material composition in Example 1, and the difference from Example 1 was the following change in the manufacturing process conditions. (1) Put the prepared alloy ingot into the smelting furnace, set the smelting temperature at 730℃ and the smelting time for 10h, and check whether the composition meets the requirements. After passing the requirements, carry out the following procedure. (2) The molten alloy is transferred to a converter for degassing, refining and deslag removal, where the degassing treatment conditions include a temperature of 710°C and a time of 10 minutes, and the refining treatment conditions are at a temperature of 720°C, with light and uniform stirring, adding refining agents to refine, and leaving for 15 minutes, after which the floating slag is removed using a slag removal tool, and the composition is detected to see whether it meets the requirements, and after passing the procedure, the procedure is carried out. (3) The molten alloy from the converter is transferred to the machine-side furnace, kept warm, and the slag is removed. The keeping temperature is 670°C and the keeping time is 10 hours. It is checked whether the composition meets the requirements. If it passes, the next procedure is carried out. (4) Die casting was performed, and the die casting parameters are shown in Table 3 below.

[0056] Example 7 Example 7 refers to the manufacturing method in Example 1, and the difference between Example 7 and 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 Example 1.

[0057] Comparative Example 1 Referring 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 that of 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 that of Example 1.

[0059] Comparative Example 3 The die-cast aluminum alloy material was manufactured with reference to the method disclosed in Example 1 of Chinese Patent Publication No. 115961186.

[0060] Comparative Example 4 The aluminum alloy material was prepared with reference to the method disclosed in Example 3 of Chinese Patent Publication No. 104831129.

[0061] Comparative Example 5 The aluminum alloy material was prepared with reference to the method disclosed in Example 6 of Chinese Patent Publication No. 105463269.

[0062] Comparative Example 6 The aluminum alloy material was prepared with reference to the method disclosed in Example 1 of Chinese Patent Publication No. 105316542.

[0063] Comparative Example 7 The aluminum alloy material was manufactured with reference to the method disclosed in Example 1 of Chinese Patent Publication No. 107829000.

[0064] [Table 1]

[0065] [Table 2]

[0066] [Table 3]

[0067] (Test Example 1) This test example is used to carry out a mechanical performance test by taking main body samples from the products manufactured in the above examples and comparative examples.

[0068] The method of carrying out the main body sampling is to first obtain the part body by the die casting process, mark the area to be filled with the tensile sample, and then obtain the marked sample block by cutting, and obtain the standard tensile sample from the above sample block by the slow wire cutting method, the sample specification is a small size test in accordance with ASTM E8, and the thickness is the actual thickness of the main body, which is about 5mm to about 6mm, and adopt such a tensile sample.

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

[0070] [Table 4]

[0071] From the data in Table 4 above, we can see that: As can be seen from the comparison between Examples 1 to 6 and Comparative Examples 1 and 2, in Comparative Examples 1 and 2, the alloy production was performed without adopting the raw material mixing ratio provided by the present disclosure, so the obtained cast aluminum alloy materials had poor yield strength, tensile strength and elongation, which indicates that the main body performance of the die-cast aluminum alloy material that does not require heat treatment produced by the method provided by the present disclosure is superior.

[0072] As can be seen from the comparison between Examples 1 to 6 and Comparative Examples 2 to 7, in Examples 1 to 6, the die-cast aluminum alloy materials that do not require heat treatment and are manufactured by the method provided by the present disclosure have higher yield strength and tensile strength while ensuring a relatively high elongation rate.

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

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

[0075] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the drawings, the present disclosure is not limited to the specific details of the above embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and all of these simple modifications fall within the scope of protection of the present disclosure.

[0076] It should be noted that each specific technical feature described in the above specific embodiments can be combined in any suitable manner, unless contradictory, and in order to avoid unnecessary repetition, the present disclosure omits various possible combination manners.

[0077] In addition, different embodiments of the present disclosure can be combined in any manner, and should be considered as being disclosed in the present disclosure as long as it does not go against the spirit of the present disclosure. [Explanation of symbols]

[0078] 1. Main body sampling position

Claims

1. 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 comprises: % 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 balance Al, wherein the metal M is selected from at least one of Mn and Mo.

2. Based on the total weight of the die-cast aluminum alloy material, the die-cast aluminum alloy material comprises:

2. The die cast aluminum alloy material of claim 1 comprising 8.5 to 10 wt.% Si, up to 0.15 wt.% 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.% M metal, and balance Al.

3. The die-casting aluminum alloy material according to claim 1, characterized in that the main body performance of the die-casting aluminum alloy material includes a yield strength of 220 MPa or more, a tensile strength of 330 MPa or more, and an elongation rate of 2.3% or more, preferably the yield strength is 226 MPa or more, the tensile strength is 330 MPa or more, and the elongation rate is 2.4% or more.

4. A method for producing a die-cast aluminum alloy material not requiring heat treatment according to any one of claims 1 to 3, S1, a step of smelting an alloy raw material mixture in a smelting furnace to obtain a first molten alloy, the alloy raw material mixture containing 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 balance Al, the metal M being selected from at least one of Mn and Mo; Step S2 of performing a degassing process, a refining process, and a first slag removing process on the first molten alloy in a converter to obtain a second molten alloy; Step S3 of performing a heat retention treatment and a second slag removal treatment on the second molten alloy in the machine-side furnace to obtain a third molten alloy; and step S4 of die-casting the third alloy molten metal.

5. 5. The method for producing a die-casting aluminum alloy material not requiring heat treatment according to claim 4, characterized in that in step S1, the conditions of the smelting treatment include a smelting temperature of 730 to 750°C and a smelting time of 1 to 10 h, preferably, the smelting temperature of 740 to 750°C and the smelting time of 1 to 5 h.

6. In the step S2, the degassing treatment conditions include a temperature of 710 to 720° C. and a time of 10 to 15 min, preferably, the temperature of 715 to 720° C. and the time of 13 to 15 min; The refining treatment conditions include adding a refining agent while stirring at 710 to 720 ° C., and leaving it for 10 to 20 minutes; 5. The method for producing a die-cast aluminum alloy material that does not require heat treatment according to claim 4, wherein the first slag removal process includes removing floating slag using a slag removal tool.

7. In step S3, the conditions of the heat retention treatment include a heat retention temperature of 650 to 670° C. and a heat retention time of 0.1 to 10 h, preferably, the heat retention temperature of 658 to 662° C. and the heat retention time of 0.1 to 0.5 h; 5. The method for producing a die-cast aluminum alloy material that does not require heat treatment according to claim 4, wherein the second slag removal process includes removing floating slag using a slag removal tool.

8. In step S4, the conditions of 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 degree of 60 mbar or less; an aluminum molten metal 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; The method for producing die-casting aluminum alloy material without heat treatment according to claim 4, characterized in that, preferably, the casting pressure is 60 to 80 MPa, the high speed is 4.5±0.1 m / s, the vacuum degree is 40 to 50 mbar, the aluminum molten metal temperature is 658 to 662°C, the temperature after the die spray is 150 to 160°C, and the injection delay time is 1±0.1 s.

9. performing a first component detection process on the first molten alloy obtained in step S1, and if a result of the first component detection process satisfies a first condition, proceeding with the first molten alloy to step S2; performing a second component detection process on the second molten alloy obtained in step S2, and if a result of the second component detection process satisfies a second condition, proceeding with the second molten alloy to step S3; performing a third component detection process on the third alloy molten metal obtained in step S3, and if a result of the third component detection process satisfies a third condition, proceeding with the third alloy molten metal to step S4; 5. The method for producing a die-cast aluminum alloy material not requiring heat treatment according to claim 4, wherein the first condition, the second condition and the third condition each independently include 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 balance Al, wherein the metal M is selected from at least one of Mn and Mo.

10. 4. An automotive structural component comprising the heat treatment-free die cast aluminum alloy material die casting according to any one of claims 1 to 3.

11. 5. An automobile structural part comprising a die-cast aluminum alloy material not requiring heat treatment, obtained by the method according to claim 4.

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