Al-Mg-Si aluminum alloy containing Fe and Ni and preparation method thereof

Abstract

The invention discloses an Al-Mg-Si aluminum alloy containing Fe and Ni and a preparation method of the Al-Mg-Si aluminum alloy. The Al-Mg-Si aluminum alloy containing Fe and Ni is prepared from the following components in percentage by mass: 0.4 percent to 5.5 percent of Mg, 0.2 percent to 1.5 percent of Si, 0.1 percent to 2.0 percent of Fe, 0.1 percent to 2.0 percent of Ni, 0.02 percent to 0.1 percent of B and the balance of Al and inevitable impurities. The aluminum alloy has the excellent comprehensive performance of high toughness and high heat resistance, the tensile strength at the room temperature exceeds 200 MPa, the yield strength exceeds 150 MPa, the elongation exceeds 16%, and the aluminum alloy can meet the technical requirements for high-toughness and high-heat-resistance parts in the fields of new energy automobiles, 5G communication, electronic packaging and the like.

Description

Technical field:

[0001] The invention relates to the technical field of alloy preparation, and in particular to an Al-Mg-Si aluminum alloy containing Fe and Ni and a preparation method thereof. Background technology:

[0002] Al-Mg-Si aluminum alloy is widely used in new energy vehicles, communications, electronic packaging and other fields due to its good toughness and thermal conductivity. However, Al-Mg-Si alloy has low strength and poor heat resistance, which limits its use. For example, new energy vehicle plates use a large amount of Al-Mg-Si alloy, and in the hot stamping process, Al-Mg-Si alloy is expected to have both high strength and toughness, and in the baking process, Al-Mg-Si alloy is expected to have high heat resistance and no softening. Adding grain refiners, such as Al-Ti-B, can achieve fine grain strengthening and improve the room temperature strength and toughness of the alloy. However, it is well known that grain refinement will lead to a decrease in the heat resistance of the alloy. Alloying can improve the performance of the alloy, but while improving the strength and heat resistance of Al-Mg-Si alloy, it will lead to a significant decrease in the toughness of the alloy. So far, there is no suitable alloying method that can simultaneously ensure the high strength and toughness of Al-Mg-Si alloy at room temperature and high temperature. . Summary of the invention:

[0003] The present invention solves the problems existing in the prior art and provides an Al-Mg-Si aluminum alloy containing Fe and Ni and a preparation method thereof. The aluminum alloy proposed by the present invention adopts a unique alloying design, and Fe and Ni are added to form an iron-rich phase to significantly refine the alloy structure. On the basis of improving the alloy strength, the alloy toughness is greatly improved. At the same time, the heat resistance of the iron-rich phase is utilized to greatly improve the heat resistance of the alloy.

[0004] The present invention aims to provide an Al-Mg-Si aluminum alloy containing Fe and Ni, which is composed of the following components by mass fraction: Mg 0.4%-5.5%, Si 0.2%-1.5%, Fe 0.1%-2.0%, Ni 0.1%-2.0%, and the rest being Al and unavoidable impurities.

[0005] The present invention adds Fe and Ni, and at the same time modifies the iron-rich phase through Mg and Si, thereby greatly improving the room temperature and high temperature strength and toughness of the alloy, breaking the inverted bottleneck that strength and toughness cannot be achieved at the same time, and obtaining an Al-Mg-Si aluminum alloy with both high strength and toughness mechanical properties and high heat resistance.

[0006] The aluminum alloy proposed in the present invention has excellent comprehensive properties of high strength, toughness and high heat resistance, with room temperature tensile strength exceeding 200MPa, yield strength exceeding 150MPa, and elongation up to 22%. The high temperature tensile strength at 300℃ exceeds 100MPa, which can meet the technical requirements of high strength, toughness and high heat resistance parts in the fields of new energy vehicles, 5G communications, and electronic packaging.

[0007] After adding Fe and Ni, the aluminum alloy proposed by the present invention further refines and modifies Mg and Si to form an iron-rich phase that significantly refines the alloy structure. Compared with the Al-Mg-Si alloy without adding Fe and Ni, the strength is improved and the elongation is increased by 2 times, thereby obtaining high-toughness mechanical properties. Compared with the Al-Fe-Ni alloy without adding Mg and Si, the strength is improved and the elongation is also increased by two times. The alloy is free of heat treatment and can also be further strengthened by heat treatment.

[0008] Preferably, the aluminum alloy consists of the following components, measured by mass fraction: Mg 1.0%-5.5%, Si 0.5%-1.0%, Fe 0.5%-1.0%, Ni 0.5%-1.0%, and the rest is Al and unavoidable impurities.

[0009] Preferably, the room temperature tensile strength of the aluminum alloy is greater than 200 MPa, the yield strength is greater than 150 MPa, and the elongation is 16%-22%.

[0010] The functions of the components of the aluminum alloy proposed by the present invention are as follows:

[0011] Mg: Mg and Si will precipitate Mg2Si strengthening phase during the aging heat treatment process, which is the main strengthening phase of aluminum alloy. The higher the Mg content, the more Mg2Si strengthening phases, and the higher the strength of the aluminum alloy. Properly increasing the Mg content is beneficial to reducing the hot cracking tendency during the liquid die forging process, but too high Mg content will also reduce the plasticity of the aluminum alloy and reduce the thermal conductivity of the alloy. At the same time, the addition of Mg can inhibit the growth of (AlSi)5(FeNi) and make it smaller. Therefore, it is more appropriate to choose a Mg content of 0.4%-5.5%.

[0012] Si: The role of Si in aluminum alloys is first to form Mg2Si strengthening phase with Mg to enhance the strength of aluminum alloys, and secondly to improve the fluidity of aluminum alloy liquid and reduce the tendency of hot cracking. The higher the Si content, the higher the strength of the aluminum alloy, the better the fluidity of the aluminum alloy liquid, and the lower the tendency of hot cracking. At the same time, the addition of Si can transform the needle-shaped Al9FeNi phase into a fine skeletal (AlSi)5(FeNi) phase. However, when the Si content exceeds 1.0%, the melting point of the aluminum alloy will be reduced, the heat resistance will decrease, and the thermal conductivity of the alloy will be reduced. Therefore, the Si content is selected to be 0.2%-1.0%.

[0013] Fe and Ni: Fe and Ni have very low solid solubility in aluminum, which will not significantly affect the thermal conductivity of the alloy. At the same time, they form a heat-resistant skeletal iron-rich phase to improve the heat resistance of the alloy. In addition, the iron-rich phase formed can significantly refine the alloy grains, improve the alloy strength, and greatly improve the toughness of the alloy. At the same time, the increase in Fe content can significantly reduce the sticking of the alloy, but too high Fe and Ni content will also reduce the plasticity of the aluminum alloy. Therefore, it is selected to add 0.1%-2.0% Fe and 0.1%-2.0% Ni.

[0014] The present invention also protects a preparation method of the aluminum alloy, comprising the following steps: weighing industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, melting the industrial pure aluminum and Al-10Fe master alloy, adding Al-10Mg and Al-20Si master alloy after all are melted, stirring evenly, standing and heat-insulating, removing impurities with a refining agent, adding argon gas to the alloy melt by a gas blowing method for refining and slag removal, standing, cooling to 700°C-720°C, then skimming the slag, and then forming by a metal mold casting method to obtain the aluminum alloy.

[0015] The preparation method of the aluminum alloy proposed by the present invention adopts the existing common smelting process to prepare the aluminum alloy. The raw materials are industrial aluminum ingots, magnesium ingots, aluminum silicon, aluminum boron master alloy, aluminum nickel master alloy, and aluminum iron master alloy. The pouring temperature is 700°C-750°C, ordinary gravity metal casting is adopted, and heat treatment is exempted.

[0016] Preferably, the melting temperature is 700° C.-750° C., and the standing and heat-insulating time is 8-12 minutes.

[0017] The present invention also protects the application of the aluminum alloy in the fields of new energy vehicles, communications or electronic packaging.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The aluminum alloy proposed in the present invention has a simple composition and does not contain rare metals, which is beneficial to reducing the alloy cost.

[0020] (2) The aluminum alloy proposed in the present invention has high strength and toughness. Through the ratio of Mg / Si content, Mg2Si phase is generated, and iron-rich phase is formed at the same time. Through the modification of the iron-rich phase by Si, high strength and toughness mechanical properties are obtained. The room temperature tensile strength is 200 MPa, the yield strength is 150 MPa, and the elongation is as high as 22%.

[0021] (3) The aluminum alloy proposed in the present invention has high heat resistance. By adding Fe and Ni, heat-resistant iron-rich alloys are generated between grains, thereby greatly improving the high-temperature mechanical properties of the alloy. The high-temperature tensile strength at 300°C exceeds 100 MPa, which can reduce the deformation of parts during high-temperature service. Description of the drawings:

[0022] Figure 1 The metallographic structure photos of the alloy obtained in Comparative Example 1, wherein the left photo is magnified 200 times and the right photo is magnified 500 times;

[0023] Figure 2 The metallographic structure photos of the alloy obtained in Comparative Example 2, wherein the left photo is magnified 200 times and the right photo is magnified 500 times;

[0024] Figure 3 The metallographic structure photos of the alloy obtained in Comparative Example 3, wherein the left photo is magnified 200 times and the right photo is magnified 500 times;

[0025] Figure 4 The metallographic structure photos of the alloy obtained in Example 1, wherein the left photo is magnified 200 times and the right photo is magnified 500 times;

[0026] Figure 5 The metallographic structure photos of the alloy obtained in Example 2, wherein the left photo is magnified 200 times and the right photo is magnified 500 times. Specific implementation method:

[0027] The following examples are provided to further illustrate the present invention, rather than to limit the present invention.

[0028] Unless otherwise defined, all professional terms used hereinafter have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specified, the experimental materials and reagents herein are conventional commercial products in the art.

[0029] Comparative Example 1: Gravity Casting of Al-1.0Mg-0.5Si Alloy

[0030] The materials used in this comparative example are industrial pure aluminum, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Mg: 1.0%, Si: 0.5%, and the rest is Al.

[0031] The alloy is prepared by the following steps: weighed industrial pure aluminum is melted at a melting temperature of 730°C, and after all is melted, Al-10Mg and Al-20Si master alloys are added, stirred manually for 5 minutes to make the composition uniform, and allowed to stand for 10 minutes, impurities are removed with a commercially available YT-J-1 refining agent, and argon gas is added to the alloy melt for refining and slag removal by argon gas injection, and allowed to stand for 10 minutes, the slag is removed after cooling to 710°C, and then the mold is formed by a metal mold casting method. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0032] Alloy structure observation and performance test: The alloy structure (such as Figure 1 As shown), the mechanical properties test was carried out on a universal testing machine according to the national standard, with a tensile speed of 1 mm / min, and the tensile strength, yield strength and elongation indicators at room temperature and 300°C high temperature were obtained.

[0033] The gravity cast Al-1.0Mg-0.5Si alloy has been tested to have a room temperature tensile strength of 150 MPa, a yield strength of 100 MPa, an elongation of 10%, a high temperature tensile strength of 50 MPa at 300°C, and a thermal conductivity of 190 W / (m·K). Figure 1 This is the metallographic structure of the alloy. It can be seen from the figure that there are fewer second phases in the alloy and the grains are relatively coarse, which leads to poor room temperature and high temperature strength of the alloy and reduced elongation.

[0034] Comparative Example 2: Gravity Casting of Al-1.0Ni-0.5Fe Alloy

[0035] The materials used in this comparative example are industrial pure aluminum, Al-10Ni and Al-10Fe master alloy, and the composition by mass percentage is: Ni: 1.0%, Fe: 0.5%, and the rest is Al.

[0036] The alloy is prepared by the following steps: melt the weighed industrial pure aluminum at a melting temperature of 730°C. After all the aluminum is melted, add Al-10Ni and Al-10Fe intermediate alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form it. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0037] The steps of microstructure observation and performance testing of the alloy are the same as those of Comparative Example 1.

[0038] The gravity cast Al-1.0Ni-0.5Fe alloy has been tested to have a room temperature tensile strength of 130 MPa, a yield strength of 90 MPa, an elongation of 13%, a high temperature tensile strength of 80 MPa at 300°C, and a thermal conductivity of 188 W / (m·K). Figure 2 Figure 1 is the metallographic structure of the alloy. It can be seen from the figure that the second phase in the alloy is a coarse needle-shaped Al9FeNi phase with relatively coarse grains, which leads to poor room temperature and high temperature strength of the alloy and reduced elongation.

[0039] Comparative Example 3: Gravity Casting of Al-1.0Ni-1.0Fe Alloy

[0040] The materials used in this comparative example are industrial pure aluminum, Al-10Ni and Al-10Fe master alloy, and the composition by mass percentage is: Ni: 1.0%, Fe: 1.0%, and the rest is Al.

[0041] The alloy is prepared by the following steps: melt the weighed industrial pure aluminum at a melting temperature of 730°C. After all the aluminum is melted, add Al-10Ni and Al-10Fe intermediate alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form it. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0042] The steps of microstructure observation and performance testing of the alloy are the same as those of Comparative Example 1.

[0043] The gravity cast Al-1.0Ni-1.0Fe alloy was tested to have a room temperature tensile strength of 150MPa, a yield strength of 90MPa, an elongation of 8%, and a high temperature tensile strength of 90MPa at 300°C. Figure 3 Figure 1 is the metallographic structure of the alloy. It can be seen from the figure that the second phase in the alloy is a coarse needle-shaped Al9FeNi phase with relatively coarse grains, which leads to poor room temperature and high temperature strength of the alloy and reduced elongation.

[0044] Example 1: Gravity casting of Al-0.5Ni-0.5Fe-1.0Mg-0.5Si alloy

[0045] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 0.5%, Fe: 0.5%, Mg: 1.0%, Si: 0.5%, and the rest is Al.

[0046] The alloy is prepared by the following steps: weighed industrial pure aluminum and Al-10Fe master alloy are melted at a melting temperature of 730°C. After all are melted, add Al-10Mg and Al-20Si master alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0047] The steps of microstructure observation and performance testing of the alloy are the same as those of Comparative Example 1.

[0048] The gravity cast Al-0.5Ni-0.5Fe-1.0Mg-0.5Si alloy has been tested to have a room temperature tensile strength of 210MPa, a yield strength of 160MPa, an elongation of 22%, and a high temperature tensile strength of 100MPa at 300°C. Figure 4 This is the metallographic structure of the alloy. It can be seen from the figure that due to the modification of Mg and Si, the second phase in the alloy is a very fine AlSi5FeNi phase, and the grains are very fine, which leads to higher room temperature and high temperature strength and higher elongation of the alloy.

[0049] Example 2: Gravity casting of Al-1.0Ni-1.0Fe-1.0Mg-0.5Si alloy

[0050] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 1.0%, Fe: 1.0%, Mg: 1.0%, Si: 0.5%, and the rest is Al.

[0051] The alloy is prepared by the following steps: weighed industrial pure aluminum and Al-10Fe master alloy are melted at a melting temperature of 730°C. After all are melted, add Al-10Mg and Al-20Si master alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0052] The steps of microstructure observation and performance testing of the alloy are the same as those of Comparative Example 1.

[0053] The gravity cast Al-1.0Ni-0.5Fe-1.0Mg-0.5Si alloy was tested to have a room temperature tensile strength of 230 MPa, a yield strength of 180 MPa, an elongation of 20%, and a high temperature tensile strength of 120 MPa at 300°C. Figure 5 It is the metallographic structure of the alloy. It can be seen from the figure that due to the modification of Mg and Si, the second phase in the alloy is a very fine AlSi5FeNi phase, and the grains are further refined, resulting in higher room temperature and high temperature strength, higher elongation, and only a slight decrease in thermal conductivity.

[0054] Example 3: Gravity casting of Al-0.5Ni-0.5Fe-5.5Mg-1.5Si alloy

[0055] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 0.5%, Fe: 0.5%, Mg: 5.5%, Si: 1.5%, and the rest is Al.

[0056] The alloy is prepared by the following steps: weighed industrial pure aluminum and Al-10Fe master alloy are melted at a melting temperature of 730°C. After all are melted, add Al-10Mg and Al-20Si master alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0057] The steps of microstructure observation and performance testing of the alloy are the same as those of Comparative Example 1.

[0058] The gravity cast Al-0.5Ni-0.5Fe-5.5Mg-1.5Si alloy was tested to have a room temperature tensile strength of 270 MPa, a yield strength of 220 MPa, an elongation of 18%, and a high temperature tensile strength of 130 MPa at 300°C.

[0059] Example 4: Gravity casting of Al-1.0Ni-1.0Fe-5.5Mg-1.5Si alloy

[0060] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 1.0%, Fe: 1.0%, Mg: 5.5%, Si: 1.5%, and the rest is Al.

[0061] The alloy is prepared by the following steps: weighed industrial pure aluminum and Al-10Fe master alloy are melted at a melting temperature of 730°C. After all are melted, add Al-10Mg and Al-20Si master alloys, stir manually for 5 minutes to make the composition uniform, and let it stand for 10 minutes. Use the commercially available YT-J-1 refining agent to remove impurities, and add argon gas to the alloy melt for refining and slag removal by blowing. Let it stand for 10 minutes, cool to 710°C, then remove the slag, and then use the metal mold casting method to form. The melt is cast into a metal mold preheated to 200°C. The size of the casting is After cooling, samples were taken from the casting for analysis.

[0062] The gravity cast Al-1.0Ni-0.5Fe-1.0Mg-0.5Si alloy was tested to have a room temperature tensile strength of 300 MPa, a yield strength of 250 MPa, an elongation of 16%, and a high temperature tensile strength of 140 MPa at 300°C.

[0063] The performance test table of the alloys obtained from Comparative Examples 1-3 and Examples 1-4 is shown in Table 1.

[0064] Table 1 Performance test table of each alloy in comparative examples and embodiments

[0065]

[0066] It can be seen from Table 1 that the alloys obtained in Examples 1-4 all have both high toughness and high temperature strength, and the alloy obtained in Example 2 has the best comprehensive performance.

[0067] Compared with the ordinary gravity casting Al-1.0Mg-0.5Si alloy of Comparative Example 1, the alloy obtained in Example 2 achieves an improvement in room temperature toughness (tensile strength increased by 53%, yield strength increased by 60%, and elongation increased by 2 times), and a significant improvement in high temperature strength (high temperature tensile strength increased by 67%). At the same time, the room temperature toughness is improved (tensile strength increased by 53%, yield strength increased by 60%, and elongation increased by 2 times), and the high temperature strength is greatly improved (high temperature tensile strength increased by 67%).

[0068] Compared with the ordinary gravity casting Al-0.5Fe-0.5Ni alloy of Comparative Example 2, the room temperature toughness is improved (tensile strength is increased by 77%, yield strength is increased by 125%, and elongation is increased by 54%), and the high temperature strength is greatly improved (high temperature tensile strength is increased by 50%).

[0069] Compared with the ordinary gravity casting Al-1.0Fe-1.0Ni alloy of Comparative Example 3, the room temperature toughness is improved (tensile strength is increased by 54%, yield strength is increased by 100%, and elongation is increased by 150%), and the high temperature strength is greatly improved (high temperature tensile strength is increased by 33%).

[0070] Example 5: Gravity casting of Al-0.1Ni-0.1Fe-0.4Mg-0.2Si alloy

[0071] Same as Example 2, except that:

[0072] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 0.1%, Fe: 0.1%, Mg: 0.4%, Si: 0.2%, and the rest is Al.

[0073] Example 6: Gravity casting of Al-2.0Ni-2.0Fe-5.5Mg-1.5Si alloy

[0074] Same as Example 2, except that:

[0075] The materials used in this embodiment are industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, and the components by mass percentage are: Ni: 2.0%, Fe: 2.0%, Mg: 5.5%, Si: 1.5%, and the rest is Al.

[0076] The aluminum alloy proposed in the present invention can meet the demand for high-strength, high-toughness, and high-heat-resistant aluminum alloys in the fields of new energy vehicles, 5G communications, and electronic packaging.

[0077] The description of the above embodiments is only used to help understand the technical solution and core ideas of the present invention. It should be pointed out that for technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An Al-Mg-Si aluminum alloy containing Fe and Ni, characterized in that: Calculated by mass fraction, it is composed of the following components: Mg 0.4%-5.5%, Si 0.2%-1.5%, Fe 0.1%-2.0%, Ni 0.1%-2.0%, and the rest are Al and unavoidable impurities.

2. The aluminum alloy according to claim 1, characterized in that Calculated by mass fraction, it is composed of the following components: Mg 1.0%-5.5%, Si 0.5%-1.0%, Fe 0.5%-1.0%, Ni 0.5%-1.0%, and the rest are Al and unavoidable impurities.

3. The aluminum alloy according to claim 1, characterized in that The room temperature tensile strength of the aluminum alloy is greater than 200 MPa, the yield strength is greater than 150 MPa, and the elongation is 16%-22%.

4. The method for preparing the aluminum alloy according to claim 1, characterized in that: The method comprises the following steps: weighing industrial pure aluminum, Al-10Ni, Al-10Fe, Al-10Mg and Al-20Si master alloy, melting the industrial pure aluminum and Al-10Fe master alloy, adding Al-10Mg, Al-10Ni and Al-20Si master alloy after all of them are melted, stirring evenly, standing and heat-insulating, removing impurities with a refining agent, adding argon gas to the alloy melt by a gas blowing method for refining and slag removal, standing, cooling to 700-720°C, then skimming the slag, and then forming by a metal mold casting method to obtain the aluminum alloy.

5. The preparation method according to claim 4, characterized in that: The melting temperature is 700°C-750°C.

6. The preparation method according to claim 4, characterized in that: The static insulation time is 8-12 minutes.

7. Application of the aluminum alloy according to claim 1 in the fields of new energy vehicles, communications or electronic packaging.

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