WO2021103362A1 - Aluminum alloy and preparation method therefor - Google Patents

Abstract

Provided are an aluminum (Al) alloy and a preparation method therefor. The Al alloy contains, in percentage by mass: 8-11% of Si, 2-3% of Cu, 0.7-1.1% of Mg, 0.7-1.5% of Mn, 0.01-0.015% of Sr, 0.01-0.015% of Cr, 0-0.4% of Fe, 0.02-0.1% of Ti, 0.01-0.02% of Ga, 0.004-0.02% of B, 0-2% of Zn, with the balance being Al and other elements, wherein the total amount of the other elements is less than 0.1%.

Description

Aluminum alloy and preparation method thereof

Cross-references to related applications

This disclosure claims the priority rights of the Chinese patent application with the application number 201911174477.0 filed on November 26, 2019, and all of them are incorporated herein.

Technical field

The present disclosure belongs to the technical field of die-cast aluminum alloys, and specifically relates to aluminum alloys and preparation methods thereof.

Background technique

Die casting is a precision casting method that uses high pressure to force the molten metal into a metal mold with a complicated shape. Die-casting parts cast by die-casting have very small dimensional tolerances and high surface accuracy. In most cases, the die-casting parts can be assembled and applied without turning.

The die-casting of aluminum alloy has high requirements on the mechanical properties of the aluminum alloy, such as yield strength, tensile strength, elongation, and fluidity of the melt. The existing die-casting aluminum alloy materials have high requirements on the forming process when die-casting. The control conditions are highly dependent on precision, and are greatly affected by the small fluctuations of process parameters, and it is difficult to take into account the strength requirements and elongation requirements of die-casting.

Public content

In view of the problem that the existing die-cast aluminum alloy materials are difficult to meet the process requirements required for die-casting, the present disclosure provides an aluminum alloy and a preparation method thereof.

The technical solutions adopted by the present disclosure to solve the above technical problems are as follows:

In one aspect, the present disclosure provides an aluminum alloy. The aluminum alloy contains 8 to 11% Si, 2 to 3% Cu, 0.7 to 1.1% Mg, and 0.7 to 1.5% Mn in terms of mass percentage. 0.01 to 0.015% of Sr, 0.01 to 0.015% of Cr, 0 to 0.4% of Fe, 0.02 to 0.1% of Ti, 0.01 to 0.02% of Ga, 0.004 to 0.02% of B, 0 to 2% of Zn, and The balance of Al and other elements, the total amount of which is less than 0.1%.

In some embodiments, in terms of mass percentage, the aluminum alloy contains: 9 to 10.8% of Si, 2.5 to 2.8% of Cu, 0.7 to 1.1% of Mg, 0.9 to 1.3% of Mn, and 0.01 to 0.015% of Sr , 0.01～0.015% Cr, 0～0.4% Fe, 0.03～0.1% Ti, 0.01～0.015% Ga, 0.004～0.01% B, 0～2% Zn, and the balance Al and others Elements, the total amount of the other elements is less than 0.1%.

According to the aluminum alloy of some embodiments of the present disclosure, the mass ratio of Ti to B is (5-10):1.

According to the aluminum alloy of some embodiments of the present disclosure, the mass percentage content of Ga is greater than the mass percentage content of Sr.

According to the aluminum alloy of some embodiments of the present disclosure, the mass content of Si and Cu satisfies the following condition: Wt(Si)=(Wt(Cu)-0.2)×(3-5).

According to the aluminum alloy of some embodiments of the present disclosure, the mass content of Mn and Cu satisfies the following condition: Wt(Cu)=(Wt(Mn)-0.3)×(2.5-4).

According to the aluminum alloy of some embodiments of the present disclosure, the other element includes one or more of Zr, Ni, Ce, Sc, and Er.

On the other hand, the present disclosure provides a method for preparing the aluminum alloy as described above. The method includes the following steps: weighing a required ratio of raw materials according to the proportion of each element in the aluminum alloy, and adding the raw materials to a melting furnace for smelting; The molten metal obtained by smelting is subjected to slag removal and refining and degassing treatments and then cast to obtain an aluminum alloy ingot.

According to the method of some embodiments of the present disclosure, the deslagging operation includes adding a deslagging agent to the molten metal, and the deslagging agent includes aluminum alloy deslagging agent NF-1 and DSG aluminum alloy deslagging and degassing agent. One or more

According to the method of some embodiments of the present disclosure, in the refining and degassing operation, the refining temperature is 700 to 710°C, and the refining and degassing includes adding a refining agent to the molten metal, and the refining agent includes hexafluoroethane, One or more of aluminum refining agent ZS-AJ01C.

The method according to some embodiments of the present disclosure further includes die-casting the aluminum alloy ingot.

According to the method of some embodiments of the present disclosure, artificial aging treatment is performed on the aluminum alloy formed by die casting.

According to the method of some embodiments of the present disclosure, the treatment temperature of the artificial aging treatment is 100˜200° C., and the treatment time is 1.5˜3 h.

According to the aluminum alloy provided by the present disclosure, by adjusting the ratio control of each strengthening element in the aluminum alloy, the aluminum alloy has a higher yield strength and thermal conductivity, and a better elongation is ensured without sacrificing strength. The aluminum alloy obtained by smelting and die-casting according to the formula provided in the present disclosure has a yield strength of about 240-260 MPa, a tensile strength of about 380-410 MPa, an elongation of 3 to 6%, and a thermal conductivity of about 130-142 W/(k·m). In addition, the aluminum alloy material has low process requirements, and has good process adaptability when applied to the die-casting process.

Description of the drawings

Figure 1 is a metallographic photograph of the aluminum alloy prepared in Example 1 of the present disclosure;

2 is an SEM photograph of the aluminum alloy prepared in Example 1 of the present disclosure;

Fig. 3 is the SEM-diffraction pattern at the cross mark in Fig. 2.

Detailed ways

In order to make the technical problems, technical solutions, and beneficial effects solved by the present disclosure clearer, the following further describes the present disclosure in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not used to limit the present disclosure.

In one aspect, the present disclosure provides an aluminum alloy. The aluminum alloy contains 8 to 11% Si, 2 to 3% Cu, 0.7 to 1.1% Mg, and 0.7 to 1.5% Mn in terms of mass percentage. 0.01 to 0.015% of Sr, 0.01 to 0.015% of Cr, 0 to 0.4% of Fe, 0.02 to 0.1% of Ti, 0.01 to 0.02% of Ga, 0.004 to 0.02% of B, 0 to 2% of Zn, and The balance of Al and other elements, the total amount of which is less than 0.1%.

According to the aluminum alloy provided by the present disclosure, by adjusting the ratio control of each strengthening element in the aluminum alloy, the aluminum alloy has a higher yield strength and thermal conductivity, and a better elongation is ensured without sacrificing strength. The aluminum alloy obtained by smelting and die-casting according to the formula provided in the present disclosure has a yield strength of about 240-260MPa (specifically 240MPa, 242MPa, 245MPa, 248MPa, 250MPa, 251MPa, 253MPa, 255MPa, 258MPa, 260MPa, etc.), and a tensile strength of about 380- 410MPa (specifically 380MPa, 385MPa, 390MPa, 395MPa, 400MPa, 405MPa, 410MPa, etc.), elongation is about 3 to 6% (specifically, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%) Etc.), the thermal conductivity is about 130-142W/(k·m) (specifically 130W/(k·m), 132W/(k·m), 135W/(k·m), 138W/(k·m), 140W/(k·m), 142W/(k·m), etc.). In addition, the aluminum alloy material has low process requirements, and has good process adaptability when applied to the die-casting process.

In some embodiments, in terms of mass percentage, the aluminum alloy contains: 9 to 10.8% of Si, 2.5 to 2.8% of Cu, 0.7 to 1.1% of Mg, 0.9 to 1.3% of Mn, and 0.01 to 0.015% of Sr, 0.01 to 0.015% Cr, 0 to 0.4% Fe, 0.03 to 0.1% Ti, 0.01 to 0.015% Ga, 0.004 to 0.01% B, 0 to 2% Zn, and the balance of Al and Other elements, the total amount of the other elements is less than 0.1%.

In other embodiments, the aluminum alloy is composed of the following components in mass percentages: 9-10.8% Si, 2.5-2.8% Cu, 0.7-1.1% Mg, 0.9-1.3% Mn, 0.01- 0.015% Sr, 0.01～0.015% Cr, 0～0.4% Fe, 0.03～0.1% Ti, 0.01～0.015% Ga, 0.004～0.01% B, 0～2% Zn, and the balance Al.

In some specific embodiments, the content of Si is 9%, 9.8%, 10%, 10.5% or 10.8%, the content of Cu is 2.5%, 2.6% or 2.8%, and the content of Mg is 0.7%, 0.8%, 0.9%, 1% or 1.1%, Mn content is 0.9%, 1%, 1.1%, 1.2% or 1.3%, Sr content is 0.01%, 0.013%, 0.015% or 0.02%, Cr content is 0.01% , 0.013% or 0.015%, Fe content is 0, 0.1%, 0.2%, 0.3% or 0.4%, Ti content is 0.03%, 0.04%, 0.05% or 0.06%, Ga content is 0.01%, 0.013% Or 0.015%, the content of B is 0.004%, 0.005%, 0.006%, 0.007%, or 0.008%, and the content of Zn is 0, 0.3%, 0.6%, 0.9%, 1.3%, 1.7% or 2%.

Among the materials involved in the present disclosure, Si and Al form eutectic silicon and primary Si, and form dispersed primary Si and fine α-Al crystal grains under the action of the Sr element to improve the strength and fluidity of the aluminum alloy.

According to the disclosure of some embodiments of the alloy, Cu forms a solid solution phase of solid solution in Al, Al ₂ Cu also be precipitated strengthening phase, Al ₂ Cu phase may be dispersed to strengthen the grain boundaries.

According to the aluminum alloys of some embodiments of the present disclosure, as the Mg content increases, the yield strength also increases, and the elongation gradually decreases. At the same time, when the Mg content reaches 0.7% or more, the Al ₂ Cu-based dispersion strengthening phase begins to appear. (The grain size is below 10μm), and with the increase of the Mg element content, the range of this phase in the aluminum alloy gradually increases. When the Mg content exceeds 1.1%, the grains of this type of strengthening phase in the aluminum alloy will increase sharply. Larger, the elongation decreases greatly.

According to the aluminum alloy of some embodiments of the present disclosure, Mn and Cr are solid-dissolved into the aluminum alloy matrix to suppress the growth of primary Si and α-Al grains, so that the primary Si is dispersed and distributed between the grains.

According to the aluminum alloy of some embodiments of the present disclosure, Ti and B are dispersed and distributed between the grains, so that primary silicon (or called primary silicon) can be uniformly distributed into α-Al, and at the same time, α is greatly suppressed. -The growth of Al (the grain size of α-Al is reduced by one third compared to when Ti and B are not added to the aluminum alloy).

According to the aluminum alloy of some embodiments of the present disclosure, when the content of Zn is too high, it is easy to solid dissolve into the aluminum alloy, thereby affecting the solid solution of Cu, Mn and Mg elements, which will affect the precipitation of the second phase, which will affect the aluminum alloy. The thermal conductivity changes greatly.

According to the aluminum alloy of some embodiments of the present disclosure, when the content of Fe is too high, the aluminum alloy will become brittle and affect the ductility of the aluminum alloy.

It should be noted that the mechanical properties, thermal conductivity, and elongation of aluminum alloy are the result of the combined effects of the above elements. Any element that deviates from the scope provided in the present disclosure deviates from the disclosure intention of the present disclosure, resulting in aluminum alloy's mechanical properties, The decrease in thermal conductivity or elongation is not conducive to the use of aluminum alloy as a die-casting material.

According to the aluminum alloy of some embodiments of the present disclosure, the mass ratio of Ti to B is (5-10):1, specifically such as 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 Wait. Through further experiments, the inventor found that Ti-B in this ratio range ensures the high strength and higher thermal conductivity of the aluminum alloy. The reason is that the Ti element is evenly distributed around the eutectic silicon within this content range. The strength of the aluminum alloy is improved, and the addition of the B element in the ratio range ensures high strength and good thermal conductivity.

According to the aluminum alloy of some embodiments of the present disclosure, the mass percentage content of Ga is greater than the mass percentage content of Sr.

According to the aluminum alloy of some embodiments of the present disclosure, the mass percentage content of Si and Cu satisfies the following condition: Wt(Si)=(Wt(Cu)-0.2)×(3-5). Within this ratio, α-Al will _{form smaller crystal grains under the interaction of the generated eutectic silicon and Al 2} Cu, which limits the growth of its crystal grains.

According to the aluminum alloy of some embodiments of the present disclosure, the mass percentage content of Mn and Cu satisfies the following condition: Wt(Cu)=(Wt(Mn)-0.3)×(2.5-4). Si, Cu, and Mn within this ratio range, through the inducement of Ti-B, a new spherical Si ₇ Mn ₆ Cu phase is formed, which is uniformly distributed at the grain boundary, which greatly strengthens the strength and elongation of the aluminum alloy.

Under the above-mentioned ratio conditions, a high-strength α solid solution is formed in the aluminum alloy. At this time, under the action of Ti, Ga, and B, a fine strengthening phase is formed evenly distributed between the eutectic silicon and the α solid solution, ensuring that the aluminum alloy At the time of elongation, the yield strength of aluminum alloy is greatly improved, and the effect is the best.

According to the aluminum alloy of some embodiments of the present disclosure, the other element includes one or more of Zr, Ni, Ce, Sc, and Er. Zr, Ni, Ce, Sc, and Er are harmful elements, which should be avoided by reducing impurities as much as possible in the aluminum alloy. In some specific implementations, the aluminum alloy does not include the other elements mentioned above.

Specifically, Ni is used as an impurity element because its solid solution in the α solid solution in the alloy will have a greater impact on Cu, Mn and Mg, resulting in serious segregation of such elements, which will make the aluminum alloy brittle. The elements of Zr, Ce, Er, and Sc make the aluminum alloy produce an insoluble second phase, which makes the aluminum alloy composition unevenly distributed and causes the aluminum alloy to become brittle.

On the other hand, the present disclosure provides a method for preparing the aluminum alloy as described above. The method includes the following steps: weighing a required ratio of raw materials according to the proportion of each element in the aluminum alloy, and adding the raw materials to a melting furnace for smelting; The molten metal obtained by smelting is subjected to slag removal and refining and degassing treatments and then cast to obtain an aluminum alloy ingot. Wherein, the raw materials include aluminum-containing materials, silicon-containing materials, magnesium-containing materials, iron-containing materials, strontium-containing materials, titanium-containing materials, boron-containing materials, copper-containing materials, manganese-containing materials, gallium-containing materials, chromium-containing materials, and Zinc-containing material. The raw materials are selected from alloys or simple substances containing the above-mentioned elements.

In some embodiments, the deslagging operation includes adding a deslagging agent to the molten metal, and the deslagging agent includes one of aluminum alloy deslagging agent NF-1, DSG aluminum alloy deslagging and degassing agent, or Many kinds.

In some embodiments, in the refining and degassing operation, the refining temperature is 700 to 710°C (specifically, 700°C, 701°C, 702°C, 703°C, 704°C, 705°C, 706°C, 707°C, 708°C , 709°C, 710°C, etc.), the refining and degassing includes adding a refining agent to the molten metal and stirring to achieve refining and degassing, and the refining agent includes one of hexafluoroethane and aluminum refining agent ZS-AJ01C Or multiple.

The method according to some embodiments of the present disclosure further includes die-casting the aluminum alloy ingot.

In some embodiments, the temperature of the casting operation is 680°C to 720°C (specifically, 680°C, 690°C, 700°C, 710°C, 720°C, etc.).

In some embodiments, the die-cast aluminum alloy is subjected to artificial aging treatment, and the treatment temperature is 100-200°C (specifically, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C , 180°C, 190°C, 200°C, etc.), and the treatment time is 1.5-3h (specifically, 1.5h, 2h, 2.5h, 3h, etc.).

After artificial aging, the aluminum alloy produces precipitation hardening, and its effect can be observed by testing its mechanical properties. When the aluminum alloy is between 100°C and 200°C, _{the precipitation of the Al 2} Cu phase is accelerated, the grain boundary strength is strengthened, and the strength and hardness of the alloy are improved.

The following examples further illustrate the present disclosure.

Table 1

Note: All the proportions in Table 1 are calculated by weight percentage. In addition, the total weight of unavoidable impurity elements is less than 0.1%.

Example 1

This embodiment is used to illustrate the aluminum alloy and the preparation method thereof disclosed in the present disclosure, including the following operation steps:

As shown in Table 1, the aluminum alloy components are calculated by mass content: Si content is 9.5%, Cu content is 2.7%, Mg content is 1%, Mn content is 1.2%, and Sr content is 0.013%. The content of Cr is 0.012%, the content of Fe is 0%, the content of Ti is 0.04%, the content of Ga is 0.014%, the content of B is 0.005%, the content of Zn is 0%, the balance is Al and the inevitable Impurities, the unavoidable impurity content is less than 0.1%. According to the mass content of the above aluminum alloy components, calculate the required quality of various master alloys or simple metals, and then add various master alloys or simple metals to the smelting furnace for smelting. A slag remover is added to the molten metal to perform a slag removal operation, and then a refining agent is added to the molten metal to perform a refining and degassing operation, the refining temperature is 700-710°C, and an aluminum alloy ingot is obtained by casting. Then, the aluminum alloy ingot is naturally aged for 7 days to obtain the aluminum alloy.

Example 2-34

Examples 2-34 are used to illustrate the aluminum alloy and the preparation method thereof disclosed in the present disclosure, including most of the operation steps in Example 1. The difference lies in:

Using the aluminum alloy composition shown in Example 2-34 in Table 1, calculate the required quality of various master alloys or simple metals according to the mass content of the above aluminum alloy components, and then add various master alloys or simple metals into the melting furnace For smelting, adding a slag remover to the molten metal for slag removing operation, and then adding a refining agent to the molten metal for refining and degassing operation, the refining temperature is 700-710°C, and the aluminum alloy ingot is obtained by casting. Then, the aluminum alloy ingot is naturally aged for 7 days to obtain the aluminum alloy.

Comparative example 1

This comparative example is used to compare and illustrate the aluminum alloy and the preparation method thereof disclosed in the present disclosure, and includes the following operation steps:

As shown in Table 1, the aluminum alloy components are calculated by mass content: Si content is 7.8%, Cu content is 2.7%, Mg content is 1%, Mn content is 1.2%, and Sr content is 0.013%. The content of Cr is 0.012%, the content of Fe is 0%, the content of Ti is 0.04%, the content of Ga is 0.014%, the content of B is 0.005%, the content of Zn is 0%, the balance is Al and the inevitable Impurities, the unavoidable impurity content is less than 0.1%. According to the mass content of the above aluminum alloy components, calculate the required quality of various master alloys or simple metals, and then add various master alloys or simple metals to the smelting furnace for smelting. A slag remover is added to the molten metal to perform a slag removal operation, and then a refining agent is added to the molten metal to perform a refining and degassing operation, the refining temperature is 700-710°C, and an aluminum alloy ingot is obtained by casting. Then, the aluminum alloy ingot is naturally aged for 7 days to obtain the aluminum alloy.

Comparative example 2-13

Comparative Examples 2-13 are used to illustrate the aluminum alloy and the preparation method thereof disclosed in the present disclosure, including most of the operation steps in Example 1. The difference lies in:

Using the aluminum alloy components shown in Comparative Examples 2-13 in Table 1, calculate the required quality of various master alloys or simple metals according to the mass content of the above aluminum alloy components, and then add various master alloys or simple metals into the melting furnace For smelting, adding a slag remover to the molten metal for slag removal, and then adding a refining agent to the molten metal for refining and degassing, at a refining temperature of 700 to 710°C, and cast to obtain an aluminum alloy ingot. Then, the aluminum alloy ingot is naturally aged for 7 days to obtain the aluminum alloy.

Performance Testing

Scanning electron microscope imaging was performed on the aluminum alloy prepared in Example 1 above, and the obtained SEM photos are shown in Figure 1 and Figure 2. The cross-shaped marks in Figure 2 were diffracted, and the SEM diffraction pattern obtained was shown in Figure 3. , And the analysis shows that the components at the cross-shaped mark in Figure 2 are shown in Table 2.

Table 2

Element	Wt%	At%
CK	02.52	05.94
OK	01.42	02.52
MgK	00.81	00.95
AlK	71.05	74.60
SiK	07.69	07.76
MnK	12.40	06.39
CuK	04.11	01.83
Matrix	Correction	ZAF

_{It can be seen that the spherical Si 7} Mn ₆ Cu phase is formed at this place in Fig. 2 and is evenly distributed at the grain boundary, which is beneficial to improve the strength and elongation of the aluminum alloy.

The following performance tests were performed on the aluminum alloys prepared in the foregoing Examples 1-34 and Comparative Examples 1-13:

Tensile strength test: adopt GBT228.1-2010 Metallic Material Tensile Test Part 1: Room temperature test method to test the yield strength, tensile strength and elongation.

Thermal conductivity test: make a φ12.7×3mm ingot thermal conductivity wafer, spray graphite coating uniformly on both sides of the sample to be tested; put the processed sample into a laser thermal conductivity meter for testing. According to "ASTME1461 Standard Method for Measuring Thermal Diffusion Coefficient by Flash Method", conduct laser thermal conductivity test.

Fill in Table 3 with the test results obtained.

table 3

Comparing the test results of Examples 1-34 and Comparative Examples 1-13, it can be seen that compared with aluminum alloys outside the range of elements provided in the present disclosure, the aluminum alloys provided in the present disclosure have better mechanical strength and can meet the requirements of the die-casting process. Take into account good thermal conductivity, elongation and die-casting formability.

The above descriptions are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall be included in the protection of the present disclosure. Within range.

Claims (13)

1. An aluminum alloy, characterized in that, in terms of mass percentage, the aluminum alloy contains:

   8 to 11% Si, 2 to 3% Cu, 0.7 to 1.1% Mg, 0.7 to 1.5% Mn, 0.01 to 0.015% Sr, 0.01 to 0.015% Cr, 0 to 0.4% Fe, 0.02 ~0.1% of Ti, 0.01 to 0.02% of Ga, 0.004 to 0.02% of B, 0 to 2% of Zn, and the balance of Al and other elements, the total amount of which is less than 0.1%.
2. The aluminum alloy according to claim 1, wherein, in terms of mass percentage, the aluminum alloy contains:

   9 to 10.8% Si, 2.5 to 2.8% Cu, 0.7 to 1.1% Mg, 0.9 to 1.3% Mn, 0.01 to 0.015% Sr, 0.01 to 0.015% Cr, 0 to 0.4% Fe, 0.03 ~0.1% of Ti, 0.01 to 0.015% of Ga, 0.004 to 0.01% of B, 0 to 2% of Zn, and the balance of Al and other elements, the total amount of which is less than 0.1%.
3. The aluminum alloy according to claim 1 or 2, wherein the mass ratio of Ti to B in the aluminum alloy is (5-10):1.
4. The aluminum alloy according to any one of claims 1 to 3, wherein in the aluminum alloy, the mass percentage content of Ga is greater than the mass percentage content of Sr.
5. The aluminum alloy according to any one of claims 1 to 4, characterized in that, in the aluminum alloy, the mass percentage content of Si and Cu satisfies the following conditions:

   Wt(Si)=(Wt(Cu)-0.2)×(3～5).
6. The aluminum alloy according to any one of claims 1 to 5, wherein, in the aluminum alloy, the mass percentage content of Mn and Cu satisfies the following conditions:

   Wt(Cu)=(Wt(Mn)-0.3)×(2.5-4).
7. The aluminum alloy according to any one of claims 1 to 6, wherein the other elements include one or more of Zr, Ni, Ce, Sc, and Er.
8. A method for preparing the aluminum alloy according to any one of claims 1 to 7, characterized in that it comprises the following operation steps:

   Weigh the raw materials in the required proportions according to the proportions of the elements in the aluminum alloy, add the raw materials to the smelting furnace for smelting, and the molten metal obtained by the smelting is subjected to slag removal and refining and degassing treatments before being cast to obtain aluminum Alloy ingot.
9. The method according to claim 8, wherein the slag removing comprises adding the slag remover to the molten metal, and the slag remover includes aluminum alloy slag remover NF-1 and DSG aluminum alloy One or more of the deslagging and degassing agents.
10. The method according to claim 8 or 9, wherein in the refining and degassing operation, the refining temperature is 700 to 710°C, and the refining and degassing includes adding a refining agent to the molten metal, and the refining agent Including one or more of hexafluoroethane and aluminum refining agent ZS-AJ01C.
11. The method according to any one of claims 8-10, further comprising:

    The aluminum alloy ingot is formed by die casting.
12. The method according to claim 11, wherein the aluminum alloy formed by die-casting is artificially aged.
13. The method according to claim 12, wherein the treatment temperature of the artificial aging treatment is 100-200°C, and the treatment time is 1.5-3h.

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