Aluminum alloy material for additive manufacturing, additive manufacturing process and product thereof

Abstract

The present invention provides an aluminum alloy material for additive manufacturing, an additive manufacturing process and a product thereof, which belong to the field of laser additive manufacturing technology. The aluminum alloy material comprises the following components in mass percentage: Mg 2.5%-3.6%, Mn 0.7%-1.3%, Zr 0.5-1.1%, Cu 0.08%-0.15%, Fe 0.12%-0.18%, and the remainder is Al; the additive manufacturing process comprises the following steps: (1) designing a three-dimensional model of an aluminum alloy component; (2) spreading powder on the aluminum alloy material, laser scanning the powder layer, with a spot diameter of 60μm-80μm, and performing additive manufacturing; (3) cooling with an inert gas below minus 30 degrees Celsius; (4) performing heat treatment; (5) repeating steps (1)-(4) to obtain a product. The aluminum alloy material prepared by the present invention by adjusting the formula can ensure the mechanical properties and 3D printing forming properties of the obtained aluminum alloy.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser additive manufacturing, and specifically relates to an aluminum alloy material for additive manufacturing, an additive manufacturing process and a product thereof. Background Art

[0002] Aluminum alloy has the advantages of good corrosion resistance and light weight, and is one of the ideal lightweight materials. Additive manufacturing technology uses high-energy beam lasers, electrons and arcs as heating sources, and powders and wires as raw materials. It builds three-dimensional models and slices them to form parts with complex structures layer by layer. Compared with traditional processing technology, this technology consumes less material and has lighter product quality. This technology includes selective laser melting technology, laser melting deposition technology, electron beam melting forming manufacturing technology, arc additive technology, etc. Among them, selective laser melting technology has become one of the most widely used technologies for metal materials due to its high precision of formed products.

[0003] Compared with traditional casting, forging and powder metallurgy technology, the advantage of laser 3D printing technology is that it can produce components with complex shapes. The higher cooling rate also gives the metal material a fine microstructure, and its mechanical properties are relatively excellent. However, most of the metal parts formed by laser 3D printing technology currently use traditional grades of composition. The traditional alloy composition designed based on the balanced solidification process is not suitable for laser 3D printing processes with rapid melting and solidification of materials. In addition, aluminum alloys have extremely high laser reflectivity, low energy utilization and forming efficiency, and most aluminum alloys have a wide solidification temperature range and crack sensitivity, and poor laser processability.

[0004] Therefore, there is an urgent need for an aluminum alloy material for additive manufacturing, an additive manufacturing process and its products. Summary of the invention

[0005] The purpose of the present invention is to provide an aluminum alloy material for additive manufacturing, an additive manufacturing process and products thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A first aspect of the present invention provides an aluminum alloy material for additive manufacturing, comprising the following components in mass percentage: Mg 2.5%-3.6%, Mn 0.7%-1.3%, Zr 0.5%-1.1%, Cu 0.08%-0.15%, Fe 0.12%-0.18%, and the remainder is Al; the mass ratio of Mg, Mn and Zr is (30-33): (8-10): (5-7).

[0008] Furthermore, the mass ratio of Mg, Mn and Zr is 32:9.4:6.5.

[0009] Furthermore, the aluminum alloy material includes the following components in mass percentage: Mg 3.2%, Mn 0.94%, Zr 0.65%, Cu 0.12%, Fe 0.15%, and the balance is Al.

[0010] In the prior art, in order to improve the performance of aluminum alloy materials, multiple metal elements are usually compounded. For example, the invention patent with application number 202010630989.X uses more than 10 metal elements to improve the performance of aluminum alloy materials, which undoubtedly increases the procurement cost, and the price of individual elements themselves is relatively high, making the overall cost of aluminum alloy materials high. The aluminum alloy material of the present invention has a simple metal element composition, and by optimizing the composition design, the mechanical properties of the products prepared from the aluminum alloy material can be excellent.

[0011] By controlling the content of these elements within a specific range, the formation of these phases can be optimized, thereby achieving the purpose of strengthening. The appropriate Mg content can ensure the precipitation of the Mg2Al3 phase, while the presence of Mn helps to reduce the formation of the brittle phase, and Zr helps to refine the grains; all these factors work together to make the final aluminum alloy material have a higher tensile strength and yield strength. When designing the aluminum alloy composition, the present invention also takes into account shortening the alloy solidification temperature range as much as possible. At the same time, the solidification temperature range of the aluminum alloy provided by the present invention is 640°C~680°C, and the solidification range is small. The solidification temperature range of the aluminum alloy material disclosed in the present invention is narrower, which is extremely important for 3D printing forming performance.

[0012] During the experiment, it was found that when the mass ratio of Mg, Mn and Zr is (30-33): (8-10): (5-7), the plasticity of the aluminum alloy product can be improved. Under this condition, the Mg content can be guaranteed to be moderate, which can provide the necessary strengthening effect without causing the material to become too brittle. At the same time, the appropriate combination of Mg and Mn can ensure that the material has sufficient strengthening effect without being too brittle, and the addition of Zr helps to refine the grains. During the rapid cooling of 3D printing, fine and dispersed particles are precipitated from the aluminum alloy liquid, which plays a good role in grain refinement, thereby reducing the tendency of 3D printing cracks, thereby improving plasticity, and avoiding the precipitation of alloy (i.e., deposition state) strengthening phases during the 3D printing process as much as possible, ensuring that the alloy has sufficient strength and good plasticity during printing. At the same time, under this condition, the elongation and cross-sectional shrinkage of the product can be improved.

[0013] Furthermore, the preparation method of the aluminum alloy material is:

[0014] (1) Add the metal elements in the components of the aluminum alloy material according to the proportion and smelt them in a vacuum melting furnace at a melting temperature of 600°C to 630°C and a pressure in the furnace of 0.8MPa to 0.9MPa; after smelting, atomize and pulverize the powder, the atomizing atmosphere is argon gas, and the atomizing gas pressure is 4MPa to 6MPa to obtain primary alloy powder;

[0015] (2) The primary alloy powder is ball-milled and blended, and after ball-milling, the powder is sieved and vacuum-dried to obtain an aluminum alloy material.

[0016] Furthermore, the ball milling medium is anhydrous ethanol, the ball milling speed is 220 rad / min~250 rad / min, and the ball milling time is 8h~9h.

[0017] Furthermore, the vacuum drying temperature is 80°C to 90°C, the drying time is 2h to 3h, and the vacuum degree is -1.0×10 5 Pa~-0.8×10 5 Pa.

[0018] Furthermore, the particle size of the aluminum alloy material is 20 μm-63 μm.

[0019] A second aspect of the present invention provides a manufacturing process for manufacturing an additive material using the aluminum alloy material, comprising the following steps:

[0020] (1) Use 3D modeling software to design a 3D model of the aluminum alloy component;

[0021] (2) Powdering the aluminum alloy material to form a powder layer, and then performing laser scanning on the powder layer under the protection of inert gas with a spot diameter of 60 μm-80 μm for additive manufacturing;

[0022] (3) Use inert gas cooling below -30 degrees Celsius;

[0023] (4) heat treatment;

[0024] (5) Repeat steps (1) to (4) to obtain the product.

[0025] Furthermore, the heat treatment conditions are as follows: place it in a heat treatment furnace and heat it to 550°C-600°C at a heating rate of 8°C / min-10°C / min, keep it warm for 4h-8h to complete the solution treatment; take it out of the heat treatment furnace and place it at room temperature to cool, and the transfer time is less than 10s.

[0026] Furthermore, the laser power is 350W-450W, the laser scanning speed is 800mm / s-1500mm / s, and the scanning interval of the laser scanning is 0.06mm-0.15mm.

[0027] The third aspect of the present invention also provides products prepared by the manufacturing process.

[0028] Furthermore, the spot diameter of the laser scanning is 70 μm.

[0029] Furthermore, the layer thickness of the powder is 0.03 mm;

[0030] Furthermore, the transfer time is less than 10 s.

[0031] In the present invention, the parameters of the laser additive manufacturing process are based on the laser absorption rate of the aluminum alloy material. If the laser power is too high or the scanning speed is too low, it is easy to form overheating, which makes it difficult for the parts to continue to be stacked and formed; when the laser power and scanning speed are too low, an effective molten pool cannot be formed. The laser power and laser scanning rate present a typical printing microstructure, a fish-scale molten pool, within the above range. The laser additive manufacturing process has a fast cooling rate and belongs to non-equilibrium solidification. The additive manufacturing of high-strength aluminum alloys is prone to produce non-equilibrium eutectic phase T phase, and a small amount of other metal elements will be added to the additive manufacturing Al alloy to play a role in solid solution strengthening. However, due to the limited solid solubility between metals, there will be intermetallic compounds distributed at the grain boundaries, which will reduce the elongation of the alloy. At the same time, it will cause the material to have poor stress corrosion and electrochemical corrosion ability. Therefore, it is necessary to use heat treatment methods to regulate the strength and elongation of the additively manufactured aluminum alloy.

[0032] The invention provides a product prepared by the manufacturing process, and the product is a shell of an electronic product.

[0033] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0034] 1. The forming process of the present invention adopts laser additive manufacturing. The forming of aluminum alloy materials in printing is a rapid non-equilibrium solidification process. The obtained microstructure is uniform and dense, showing a typical printing microstructure (fish scale molten pool), such as Figure 1 As shown, aluminum alloy products with complex shapes can be obtained, which is conducive to the development of this new aluminum alloy material in various precision manufacturing industries.

[0035] 2. The aluminum alloy material of the present invention has a simple metal element composition. By optimizing the composition design, the mechanical properties of the products prepared from the aluminum alloy material can be excellent. When designing the aluminum alloy composition, the present invention also considers shortening the alloy solidification temperature range as much as possible. At the same time, the solidification temperature range of the aluminum alloy provided by the present invention is 640℃~680℃, and the solidification range is small. The solidification temperature range of the aluminum alloy material disclosed by the present invention is narrower, which is extremely important for 3D printing forming performance.

[0036] 3. During the experiment, it was found that when the mass ratio of Mg, Mn and Zr is (30-33): (8-10): (5-7), the plasticity of aluminum alloy products can be improved. At the same time, under this condition, the elongation and cross-sectional shrinkage of the product can be improved.

[0037] 4. In the present invention, the parameters of the laser additive manufacturing process are based on the laser absorption rate of the aluminum alloy material. If the laser power is too high or the scanning speed is too low, overheating is likely to occur, making it difficult to continue to stack and form the components. When the laser power and the scanning speed are too low, an effective molten pool cannot be formed. The laser power and the laser scanning speed within the above range present a typical printing microstructure, a fish-scale molten pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 : (a) is a microstructure morphology of the product of Example 1; (b) is a typical microstructure morphology of the product prepared by the additive manufacturing process of the aluminum alloy powder prepared in Example 1.

[0039] Figure 2 Schematic diagram of the stress-strain curve of the product prepared by the additive manufacturing process of Example 1. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] The present embodiment provides an aluminum alloy material for additive manufacturing, wherein the aluminum alloy material includes the following components in mass percentage: Mg 3.2%, Mn 0.94%, Zr 0.65%, Cu 0.12%, Fe 0.15%, and the balance is Al.

[0043] The preparation method of the aluminum alloy material is:

[0044] (1) Add the metal elements in the components of the aluminum alloy material according to the proportion and smelt them in a vacuum melting furnace at a melting temperature of 620°C and a furnace pressure of 0.85 MPa; after smelting, atomize and pulverize the powder, the atomizing atmosphere is argon gas, and the atomizing gas pressure is 5 MPa to obtain primary alloy powder;

[0045] (2) The primary alloy powder was ball-milled and blended. The ball-milling medium was anhydrous ethanol. The ball-milling speed was 230 rad / min and the ball-milling time was 8.5 h. After ball-milling, the powder was screened and vacuum-dried. The vacuum drying temperature was 85 °C, the drying time was 2.4 h, and the vacuum degree was -1.0×10 5 Pa, and obtain aluminum alloy material.

[0046] The additive manufacturing process of the aluminum alloy material is characterized by comprising the following steps:

[0047] (1) Use 3D modeling software to design a 3D model of the aluminum alloy component;

[0048] (2) The aluminum alloy material is powdered to form a powder layer. Under the protection of inert gas, the powder layer is laser scanned with a spot diameter of 70 μm, a laser power of 400 W, a laser scanning speed of 1000 mm / s, and a laser scanning spacing of 0.12 mm for additive manufacturing;

[0049] (3) Use inert gas cooling below -30 degrees Celsius;

[0050] (4) Perform heat treatment; the heat treatment conditions are: place in a heat treatment furnace and heat to 580°C at a heating rate of 9°C / min, keep warm for 6 hours, and complete the solution treatment; take out from the heat treatment furnace and cool at room temperature, and the transfer time is less than 10 seconds;

[0051] (5) Repeat steps (1) to (4) to obtain the product. Figure 1 .pass Figure 1 It can be seen that the products prepared by the manufacturing process of this embodiment, whether they have undergone a heat treatment process or not, all present a typical printed microstructure and a fish-scale molten pool, indicating that the microstructure obtained by the manufacturing process of the present invention is uniform and dense, presenting a typical printed microstructure.

[0052] Example 2

[0053] The present embodiment provides an aluminum alloy material for additive manufacturing, wherein the aluminum alloy material includes the following components in mass percentage: Mg 3.0%, Mn 0.8%, Zr 0.5%, Cu 0.08%, Fe 0.12%, and the balance is Al.

[0054] The preparation method of the aluminum alloy material is:

[0055] (1) The metal elements in the components of the aluminum alloy material are added into a vacuum melting furnace according to the proportion for melting at a melting temperature of 600°C and a furnace pressure of 0.8 MPa; after melting, atomization and powdering are performed, the atomization atmosphere is argon gas, and the atomization gas pressure is 4 MPa to obtain primary alloy powder;

[0056] (2) The primary alloy powder was ball-milled and blended. The ball-milling medium was anhydrous ethanol. The ball-milling speed was 220 rad / min and the ball-milling time was 8 h. After the ball-milling, the powder was screened and vacuum-dried. The vacuum drying temperature was 80 °C, the drying time was 2 h, and the vacuum degree was -1.0×10 5 Pa, and obtain aluminum alloy material.

[0057] The additive manufacturing process of the aluminum alloy material is characterized by comprising the following steps:

[0058] (1) Use 3D modeling software to design a 3D model of the aluminum alloy component;

[0059] (2) The aluminum alloy material is powdered to form a powder layer. Under the protection of inert gas, the powder layer is laser scanned with a spot diameter of 60 μm, a laser power of 350 W, a laser scanning speed of 800 mm / s, and a laser scanning spacing of 0.06 mm for additive manufacturing;

[0060] (3) Use inert gas cooling below -30 degrees Celsius;

[0061] (4) Perform heat treatment; the heat treatment conditions are: place in a heat treatment furnace and heat to 550°C at a heating rate of 8°C / min, keep warm for 4 hours to complete the solution treatment; take out from the heat treatment furnace and place at room temperature to cool, and the transfer time is less than 10 seconds;

[0062] (5) Repeat steps (1) to (4) to obtain the product.

[0063] Example 3

[0064] The present embodiment provides an aluminum alloy material for additive manufacturing, wherein the aluminum alloy material includes the following components in mass percentage: Mg 3.3%, Mn 1%, Zr 0.7%, Cu 0.15%, Fe 0.18%, and the balance is Al.

[0065] The preparation method of the aluminum alloy material is:

[0066] (1) The metal elements in the components of the aluminum alloy material are added into a vacuum melting furnace according to the proportion for melting at a melting temperature of 630°C and a furnace pressure of 0.9 MPa; after melting, atomization and powdering are performed, the atomization atmosphere is argon gas, and the atomization gas pressure is 6 MPa to obtain primary alloy powder;

[0067] (2) The primary alloy powder was ball-milled and blended. The ball-milling medium was anhydrous ethanol. The ball-milling speed was 250 rad / min and the ball-milling time was 9 h. After the ball-milling, the powder was screened and vacuum-dried. The vacuum drying temperature was 90 °C, the drying time was 3 h, and the vacuum degree was -0.8×10 5 Pa, and obtain aluminum alloy material.

[0068] The additive manufacturing process of the aluminum alloy material is characterized by comprising the following steps:

[0069] (1) Use 3D modeling software to design a 3D model of the aluminum alloy component;

[0070] (2) The aluminum alloy material is powdered to form a powder layer. Under the protection of inert gas, the powder layer is laser scanned with a spot diameter of 80 μm, a laser power of 450 W, a laser scanning speed of 1500 mm / s, and a laser scanning spacing of 0.15 mm for additive manufacturing;

[0071] (3) Use inert gas cooling below -30 degrees Celsius;

[0072] (4) Perform heat treatment; the heat treatment conditions are: place in a heat treatment furnace and heat to 600°C at a heating rate of 10°C / min, keep warm for 8 hours, and complete the solution treatment; take out from the heat treatment furnace and cool at room temperature, and the transfer time is less than 10 seconds;

[0073] (5) Repeat steps (1) to (4) to obtain the product.

[0074] Comparative Example 1

[0075] The difference between this comparative example and Example 1 is that the aluminum alloy material includes the following components in mass percentage: Mg2%, Mn1.5%, Zr0.5%, Cu0.20%, Fe0.1%, and the balance is Al.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 1 is that the aluminum alloy material includes the following components in mass percentage: Mg 2.5%, Mn 1.3%, Zr 0.5%, Cu 0.15%, Fe 0.12%, and the balance is Al.

[0078] Comparative Example 3

[0079] The difference between this comparative example and Example 1 is that the aluminum alloy material includes the following components in mass percentage: Mg 2.2%, Mn 0.74%, Zr 0.95%, Cu 0.12%, Fe 0.15%, and the balance is Al.

[0080] Comparative Example 4

[0081] The difference between this comparative example and Example 1 is that the laser power is 300 W and the laser scanning speed is 600 mm / s.

[0082] Comparative Example 5

[0083] The difference between this comparative example and Example 1 is that the laser power is 500 W and the laser scanning speed is 1700 mm / s.

[0084] Comparative Example 6

[0085] The difference between this comparative example and Example 1 is that the heat treatment conditions are: placing it in a heat treatment furnace and heating it to 500°C at a heating rate of 5°C / min, keeping it warm for 3 hours, and completing the solution treatment.

[0086] Comparative Example 7

[0087] The difference between this comparative example and Example 1 is that the heat treatment conditions are: placing it in a heat treatment furnace and heating it to 650°C at a heating rate of 15°C / min, keeping it warm for 10 hours, and completing the solution treatment.

[0088] Performance Testing

[0089] The properties of the products prepared in Examples 1-3 and Comparative Examples 1-7 were measured.

[0090] 1. Tensile strength, yield strength and plasticity test: The test method is ASTME8 / E8M standard. The room temperature tensile properties of the standard tensile rod are tested using the AG-100KN material high temperature durability testing machine produced by Shimadzu Corporation of Japan. The tensile speed is 2mm / min.

[0091] 2. Vickers hardness: refer to GB / T4340.1-2009 and measured by Vickers hardness tester.

[0092] The post-fracture shrinkage and cross-sectional shrinkage refer to GB / T228.1-2021. Use a tensile testing machine to apply tensile force to the sample until it breaks, and use a caliper to accurately measure the length and size of the sample before and after it breaks. The post-fracture shrinkage and cross-sectional shrinkage are calculated according to the following formulas; among which, post-fracture shrinkage = 100% × (final gauge length - initial gauge length) / initial gauge length, cross-sectional shrinkage = 100% × (original cross-sectional area of ​​the sample - cross-sectional area of ​​the neck after the sample is broken) / original cross-sectional area of ​​the sample.

[0093] 3. Determine the solidification range based on the equilibrium phase diagram of aluminum alloy.

[0094] The results are shown in Table 1.

[0095] Table 1 Test results

[0096]

[0097] From the above performance test results, it can be seen that the comprehensive effects of the products of Examples 1-3 are good, especially the comprehensive performance of Example 1 is the most outstanding. Figure 2 This is the stress-strain curve of the product prepared in Example 1. It can be seen from the figure that the yield strength is 369 MPa and the tensile strength is 418 MPa. This is mainly due to the combined effect of component design optimization and additive manufacturing conditions.

[0098] The comparative examples, however, are significantly inferior to the embodiments in terms of corresponding performance tests because they do not adopt the necessary technical solutions. The mass percentages of the components of the aluminum alloy material in comparative example 1 exceed the scope of the present invention, and the comprehensive effects of the products are reduced to varying degrees, indicating that the components have a synergistic effect. The mass ratios of Mg, Mn and Zr in comparative example 2 are different and are not within the range of the mass ratio of Mg, Mn and Zr of (30-33): (8-10): (5-7). The component contents of Mg, Mn and Zr in comparative example 3 are not within the scope of the present invention. The plasticity, elongation after fracture and cross-sectional shrinkage of the products in comparative examples 2 and 3 decrease, indicating that the ratio and content of these three elements have an impact on plasticity, elongation after fracture and cross-sectional shrinkage. Comparative examples 4 and 5 show that if the laser power is too high or the scanning speed is too low, overheating is easily formed, making it difficult for the parts to continue to be deposited and formed. When the laser power and the scanning speed are too low, an effective molten pool cannot be formed. The laser power and the laser scanning speed within the above range present a typical printing microstructure, a fish-scale molten pool. Comparative Examples 6-7 show that the heat treatment conditions have varying degrees of influence on the comprehensive properties of the product.

[0099] The heat treatment in the present invention can reduce the stress of aluminum alloy and obtain a finished product with excellent quality. In terms of the performance of Example 1, according to the test data in Table 1 and Figure 2 The stress-strain curve of this heat treatment method is short, easy to operate, highly efficient in production, and conducive to large-scale production.

[0100] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A manufacturing process for manufacturing additive materials using aluminum alloy materials for additive manufacturing, characterized in that: The following steps are involved: (1) Use 3D modeling software to design a 3D model of the aluminum alloy component; (2) Powder the aluminum alloy material to form a powder layer. Under the protection of inert gas, the powder layer is laser scanned. The laser power of the laser scanning is 400W-450W, the speed of the laser scanning is 1000mm / s-1500mm / s, the scanning interval of the laser scanning is 0.06mm-0.15mm; the spot diameter is 60μm-80μm, and additive manufacturing is performed; (3) Use inert gas cooling below -30 degrees Celsius; (4) Perform heat treatment; the heat treatment conditions are: place in a heat treatment furnace and heat to 550°C-600°C at a heating rate of 8°C / min-10°C / min, keep warm for 4h-8h to complete the solution treatment; take out from the heat treatment furnace and cool at room temperature, with the transfer time being less than 10s; (5) Repeat steps (1) to (4) to obtain the product; The aluminum alloy material comprises the following components in mass percentage: Mg 2.5%-3.6%, Mn 0.7%-1.3%, Zr 0.5-1.1%, Cu 0.08%-0.15%, Fe 0.12%-0.18%, and the balance is Al; wherein the mass ratio of Mg, Mn and Zr is (30-33): (8-10): (5-7); The preparation method of the aluminum alloy material comprises: (1) Add the metal elements in the components of the aluminum alloy material according to the proportion and smelt them in a vacuum melting furnace at a melting temperature of 600°C to 630°C and a pressure in the furnace of 0.8MPa to 0.9MPa; after smelting, atomize and pulverize the powder, the atomizing atmosphere is argon gas, and the atomizing gas pressure is 4MPa to 6MPa to obtain primary alloy powder; (2) ball-milling the primary alloy powder, and then sieving and vacuum drying the powder after the ball-milling to obtain an aluminum alloy material; The ball milling medium is anhydrous ethanol, the ball milling speed is 220rad / min~250rad / min, and the ball milling time is 8h~9h; The vacuum drying temperature is 80℃~90℃, the drying time is 2h~3h, and the vacuum degree is -1.0×10 5 Pa~-0.8×10 5 Pa.

2. The manufacturing process according to claim 1, characterized in that: The mass ratio of Mg, Mn and Zr is 32:9.4:6.

5.

3. The manufacturing process according to claim 1, characterized in that: The aluminum alloy material includes the following components in mass percentage: Mg 3.2%, Mn 0.94%, Zr 0.65%, Cu 0.12%, Fe 0.15%, and the balance is Al.

4. An additive manufactured by the manufacturing process according to any one of claims 1 to 3.

5. A housing of an electronic product manufactured using the additive manufacturing method according to claim 4.

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