Aluminum alloy material suitable for 3D printing

Abstract

The invention discloses an aluminum alloy material suitable for 3D printing, and relates to the technical field of 3D printing aluminum alloys, the aluminum alloy material comprises the following element components by mass percentage: 1.6-2.2 wt% of Si; from 0.3 wt% to 0.6 wt% of Mg; 0.8 wt% to 1.2 wt% of Cu; from 0.7 wt% to 1.1 wt% of Zn; from 0.4 wt% to 0.8 wt% of Ti; from 0.1 wt% to 0.3 wt% of Sr; 0.05 wt% to 0.2 wt% of Y; and the balance of Al and inevitable impurities. On the basis of alloy component optimization, the comprehensive strengthening effect of the aluminum alloy is improved by regulating and controlling printing parameters and a heat treatment process under the condition that high density and no crack of a 3D printing workpiece are guaranteed, and the problems that traditional aluminum alloy 3D printing is low in strength, poor in ductility and insufficient in corrosion resistance are solved; and the requirements of more application scenes or fields can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy materials, and in particular to an aluminum alloy material suitable for 3D printing. Background Art

[0002] Additive manufacturing, a form of rapid prototyping technology, integrates computer-aided design, material processing, and molding techniques. Based on 3D model files, it utilizes bondable materials such as metal powder or plastic, using software systems to achieve layer-by-layer manufacturing, directly constructing three-dimensional parts. Due to its simple process flow, short processing cycles, and high material utilization, additive manufacturing holds broad application prospects in jewelry, healthcare, footwear, industrial design, architecture, aerospace, automotive, and education.

[0003] Selective Laser Melting (SLM) metal 3D printing uses a precisely focused laser spot to rapidly melt pre-placed layers of metal powder, creating functional parts of virtually any shape and complete metallurgical bonding. Currently, it is one of the most widely used metal additive manufacturing technologies. SLM technology can produce complex, high-performance, high-density, and high-precision parts, and has been widely used in the aerospace, medical, and automotive industries to produce steel, titanium alloy, high-temperature alloy, and aluminum alloy parts.

[0004] Compared with other metal materials, aluminum alloy has higher thermal conductivity, higher reflectivity and lower absorption rate to laser, and is prone to oxidation, which leads to problems such as cracking, low density and warping of aluminum alloy printed components. 10 Mainly Mg, AlSi 10 Mg has a high silicon content, and the potential difference between Al and Si is large. The anodic film after anodizing can have a non-dense and uneven microstructure, which can easily lead to defects and degradation, reducing corrosion resistance. Currently, the semiconductor industry still uses 6061 aluminum alloy as a material for spare parts. This alloy has a low silicon content (0.4wt% to 0.8wt%) and can be anodized to form a uniform, light-colored or even colorless anodic film. However, the temperature range of the solid-liquid phase region of 6061 aluminum alloy is small, resulting in poor die-castability and making it unsuitable for 3D printing. Summary of the Invention

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide an aluminum alloy material suitable for 3D printing, and to disclose an aluminum alloy material formula and preparation process to meet application requirements such as 3D printing forming, anodizing, heat treatment, and high mechanical properties and corrosion resistance.

[0006] In order to achieve the above object, the aluminum alloy material of the present invention includes the following elemental components in percentage by mass:

[0007] 1.6 wt% to 2.2 wt% Si;

[0008] 0.3 wt% to 0.6 wt% Mg;

[0009] 0.8 wt% to 1.2 wt% Cu;

[0010] 0.7 to 1.1 wt% Zn;

[0011] 0.4 wt% to 0.8 wt% Ti;

[0012] 0.1 wt% to 0.3 wt% Sr;

[0013] 0.05 wt% to 0.2 wt% of Y;

[0014] The balance is Al and inevitable impurities.

[0015] Another object of the present invention is to provide a method for preparing a 3D printed aluminum alloy, comprising the following steps:

[0016] The metal raw materials are proportioned according to the formula, the aluminum alloy material is heated to 780-800℃ and melted, kept warm for 30 minutes, and then pressurized to 20-25bar to atomize it, and then heated to 4-5m 3 The powder is then sprayed and cooled at a flow rate of 1 / min to form an aluminum alloy powder with a uniform composition. The particle size of the aluminum alloy powder is preferably 35μm to 55μm. The resulting aluminum alloy powder is then dried at 85-95°C for 4.5 hours before being 3D printed using a metal powder bed 3D printer to form an aluminum alloy object. Argon gas is introduced into the print chamber to control the oxygen content below 200ppm. The substrate is preheated to 90°C. The 3D printing parameters are set as follows: a scan rate of 1000-1100mm / s, a scan power of 300-400W, a thickness of 35-45 microns per layer of aluminum alloy powder, and a scan pitch of 60-80 microns.

[0017] The present invention has the following beneficial effects: Based on the optimization of alloy composition, by regulating printing parameters and heat treatment processes, this application retains a high content of alloying elements in solid solution while ensuring high density and crack-free 3D printed workpieces, controls the size and quantity of dispersed phases, and implements multiple strengthening mechanisms such as solid solution strengthening, precipitation strengthening, and grain refinement, thereby improving the overall strengthening effect of the aluminum alloy. Ultimately, the tensile strength in the normal state reaches over 425 MPa and the elongation reaches 12%. In the heat-treated state, the tensile strength reaches over 463 MPa and the elongation exceeds 10%. Compared with the traditional 3D printed AlSi10Mg alloy, the tensile strength of the aluminum alloy 3D printed by the present invention is comparable to that of the AlSi10Mg alloy in the heat-treated state, or even better than that of the AlSi10Mg alloy, and is better than the AlSi10Mg alloy in terms of plasticity and corrosion resistance. Compared with the 3D printed 6061 aluminum alloy, the 3D printed aluminum alloy of the present invention is significantly better than the 6061 aluminum alloy in mechanical properties and corrosion resistance, solving the problems of low strength, poor elongation and insufficient corrosion resistance of traditional aluminum alloy 3D printing. It can be seen that the 3D printed aluminum alloy material of the present invention can meet the needs of more application scenarios or fields. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention will be further described below in conjunction with examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] The present application discloses an aluminum alloy material suitable for 3D printing, comprising the following elemental components: Si, Mg, Cu, Zn, Ti, Sr, Y, Al and inevitable impurities.

[0020] In the examples of the present application, the silicon content is controlled between 1.6 wt% and 2.2 wt%. The silicon content should not be too high, as this can easily lead to segregation, which can easily cause defects in the aluminum alloy's anodic film, resulting in reduced density and corrosion resistance. However, the silicon content should not be too low, as this can impair the castability of the aluminum alloy melt and easily lead to defects such as shrinkage cavities and cracks within the formed part, significantly adversely affecting the quality of the aluminum alloy.

[0021] In the examples of this application, the magnesium content is controlled at 0.3wt% to 0.6wt%. If the magnesium content is too high, the aluminum alloy will have an excessive amount of Mg2Si strengthening phase, resulting in poor ductility of the formed part. However, the magnesium content cannot be too low. If it is too low, it will be difficult for magnesium to form a β-Mg2Si precipitation strengthening phase with silicon, which is evenly distributed in the α-Al matrix structure to achieve the required material strength, resulting in low mechanical strength of the aluminum alloy.

[0022] In the examples of this application, the copper content is controlled between 0.8wt% and 1.2wt%. A copper content that is too high can reduce the corrosion resistance of the aluminum alloy. A copper content below this range is less likely to form a solid solution phase (Al2Cu phase) with aluminum and diffuse onto the grain boundaries of the aluminum alloy, failing to improve the strength, toughness, and hardness of the aluminum alloy matrix.

[0023] In the embodiment of the present application, the zinc content is controlled at 0.7wt% to 1.1wt%. If the zinc content is too high, the elongation of the aluminum alloy material cannot be effectively improved; if the zinc content is too low, the ultimate tensile strength and corrosion resistance of the aluminum alloy material cannot be improved.

[0024] In the embodiments of the present application, the titanium content is controlled at 0.4wt% to 0.8wt%. If the titanium content is higher than the above specified range, the 3D-printed aluminum alloy product will have excessive welding slag, which is easily encapsulated inside the product and causes defects, resulting in a decrease in the elongation of the aluminum alloy. If the titanium content is lower than the above range, it is difficult for titanium and aluminum to form a TiAl3 phase as a non-spontaneous core during crystallization, which cannot play the role of refining the casting structure and weld structure. As a result, the tensile strength of the 3D-printed aluminum alloy product is insufficient, and the elongation is low, or even impossible to elongate, which may cause brittle fracture.

[0025] In the embodiments of the present application, the strontium content is controlled at 0.1wt% to 0.3wt%. If the strontium content is too high, it is easy to cause over-metamorphism and aggravate the hydrogen absorption tendency, affecting the performance of the aluminum alloy; if the strontium content is lower than 0.1wt%, it cannot improve the morphology of the alloy structure and refine the α dendrites and eutectic silicon in the aluminum alloy, and thus cannot improve the mechanical properties and plastic workability of the aluminum alloy material.

[0026] In the embodiments of the present application, the yttrium content is controlled at 0.05wt% to 0.2wt%. As a rare earth element, yttrium content is too high. During the solidification process of the alloy, the segregation degree of yttrium-containing compounds at the intersection of grains increases, resulting in a decrease in the supercooling of the alloy components, causing the grain size to first decrease and then increase, showing a trend of first optimization and then deterioration. At the same time, excessive yttrium content will also cause the tensile strength and yield strength of the alloy to first increase and then decrease. If the yttrium content is less than 0.05wt%, it is impossible to fully refine the alloy grains, and the mechanical strength and cyclic oxidation life of the alloy cannot be improved.

[0027] This application also discloses a method for preparing a 3D printed aluminum alloy, comprising the following steps:

[0028] The metal raw materials are proportioned according to the formula, the aluminum alloy material is heated to 780-800℃ and melted, kept warm for 30 minutes, and then pressurized to 20-25bar to atomize it, and then heated to 4-5m 3The aluminum alloy powder is sprayed and cooled at a flow rate of 1 / min to form a uniform aluminum alloy powder. The optimal particle size of the aluminum alloy powder is 35μm to 55μm. If the aluminum alloy powder particle size is too large, the surface roughness of the 3D printed part will be excessive. If the aluminum alloy powder particle size is too small, the powder will easily agglomerate, resulting in poor powder layer uniformity during the 3D printing process and uneven density of the 3D printed part.

[0029] The obtained aluminum alloy powder was first dried at 85-95°C for 4.5 hours, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy object. Argon gas was introduced into the printing chamber before printing to control the oxygen content below 200 ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: a scanning rate of 1000-1100 mm / s, a scanning power of 300-400 W, a thickness of each layer of aluminum alloy powder of 35-45 microns, and a scanning pitch of 60-80 microns. This embodiment improves the density of the workpiece by optimizing parameters such as printing power, scanning speed, and scanning pitch.

[0030] Example 1

[0031] This embodiment 1 discloses an aluminum alloy and a 3D printing method, comprising the following steps:

[0032] (1) Obtain the following raw material ingredients by weight percentage:

[0033] 1.6wt% Si, 0.3wt% Mg, 0.8wt% Cu, 0.7wt% Zn, 0.4wt% Ti, 0.1wt% Sr, 0.05wt% Y, and the balance being Al and unavoidable impurities;

[0034] (2) The aluminum alloy material was heated to 780℃ and melted. After keeping the temperature for 30 minutes, the pressure was increased to 20 bar to atomize the material. 3 The aluminum alloy powder is sprayed and cooled at a flow rate of / min to form an aluminum alloy powder with a uniform composition. The particle size of the aluminum alloy powder is 35μm;

[0035] (3) The obtained aluminum alloy powder was first dried at 85°C for 4.5 h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy workpiece. Argon gas was introduced into the printing chamber before printing to control the oxygen content below 200 ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: the scanning rate was 1000 m / s, the scanning power was 300 W, the thickness of each layer of aluminum alloy powder was 35 μm, and the scanning spacing was set to 60 μm.

[0036] Example 2

[0037] This embodiment 2 discloses an aluminum alloy and a 3D printing method, comprising the following steps:

[0038] (1) Obtain the following raw material ingredients by weight percentage:

[0039] 1.8wt% Si, 0.4wt% Mg, 0.9wt% Cu, 0.8wt% Zn, 0.5wt% Ti, 0.15wt% Sr, 0.08wt% Y, and the balance being Al and unavoidable impurities;

[0040] (2) The aluminum alloy material was heated to 785℃ and melted. After keeping the temperature for 30 minutes, the pressure was increased to 22 bar to atomize the material. 3 The aluminum alloy powder is sprayed and cooled at a flow rate of / min to form an aluminum alloy powder with a uniform composition. The particle size of the aluminum alloy powder is 35μm;

[0041] (3) The obtained aluminum alloy powder was first dried at 85°C for 4.5 h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy workpiece. Argon gas was introduced into the printing chamber before printing to control the oxygen content below 200 ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: the scanning rate was 1000 mm / s, the scanning power was 300 W, the thickness of each layer of aluminum alloy powder was 35 μm, and the scanning spacing was set to 65 μm.

[0042] Example 3

[0043] This embodiment 3 discloses an aluminum alloy and a 3D printing method, including the following steps:

[0044] (1) Obtain the following raw material ingredients by weight percentage:

[0045] 1.9wt% Si, 0.5wt% Mg, 1.0wt% Cu, 0.9wt% Zn, 0.6wt% Ti, 0.2wt% Sr, 0.1wt% Y, and the balance being Al and unavoidable impurities;

[0046] (2) The aluminum alloy material was heated to 790℃ and melted. After keeping the temperature for 30 minutes, the pressure was increased to 22 bar to atomize the material. 3 The aluminum alloy powder is sprayed and cooled at a flow rate of 1 / min to form an aluminum alloy powder with a uniform composition. The particle size of the aluminum alloy powder is 45 μm.

[0047] (3) The obtained aluminum alloy powder was first dried at 90°C for 4.5h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy workpiece. Argon gas was introduced into the printing chamber to control the oxygen content below 200ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: the scanning rate was 1100mm / s, the scanning power was 350W, the thickness of each layer of aluminum alloy powder was 40μm, and the scanning spacing was set to 70μm.

[0048] Example 4

[0049] This embodiment 4 discloses an aluminum alloy and a 3D printing method, comprising the following steps:

[0050] (1) Obtain the following raw material ingredients by weight percentage:

[0051] 2.0 wt% Si, 0.5 wt% Mg, 1.0 wt% Cu, 1.0 wt% Zn, 0.7 wt% Ti, 0.25 wt% Sr, 0.15 wt% Y, and the balance being Al and unavoidable impurities;

[0052] (2) The aluminum alloy material was heated to 795℃ and melted. After keeping the temperature for 30 minutes, the pressure was increased to 22 bar to atomize the material. 3 The aluminum alloy powder is sprayed and cooled at a flow rate of 1 / min to form an aluminum alloy material powder with a uniform composition. The particle size of the aluminum alloy material powder is 50 μm.

[0053] (3) The obtained aluminum alloy powder was first dried at 90°C for 4.5h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy workpiece. Argon gas was introduced into the printing chamber to control the oxygen content below 200ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: the scanning rate was 1100mm / s, the scanning power was 350W, the thickness of each layer of aluminum alloy powder was 40μm, and the scanning spacing was set to 75μm.

[0054] Example 5

[0055] This embodiment 5 discloses an aluminum alloy and a 3D printing method, comprising the following steps:

[0056] (1) Obtain the following raw material ingredients by weight percentage:

[0057] 2.2wt% Si, 0.6wt% Mg, 1.2wt% Cu, 1.1wt% Zn, 0.8wt% Ti, 0.3wt% Sr, 0.2wt% Y, and the balance being Al and unavoidable impurities;

[0058] (2) Heat the aluminum alloy material to 800℃ and melt it. After keeping it warm for 30 minutes, pressurize it to 25 bar to atomize it. 3 The aluminum alloy powder is sprayed and cooled at a flow rate of 1 / min to form an aluminum alloy material powder with a uniform composition. The particle size of the aluminum alloy material powder is 55 μm.

[0059] (3) The obtained aluminum alloy powder was first dried at 95°C for 4.5 h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy workpiece. Argon gas was introduced into the printing chamber before printing to control the oxygen content below 200 ppm. At the same time, the substrate temperature was preheated to 90°C. The 3D printing parameters were set as follows: the scanning rate was 1100 mm / s, the scanning power was 400 W, the thickness of each layer of aluminum alloy powder was 45 μm, and the scanning spacing was set to 80 μm.

[0060] Comparative Example 1

[0061] Take commercially available AlSi 10 Mg alloy gas powder spraying into powder and then 3D printing processing to form aluminum alloy workpieces, the AlSi 10 The Mg alloy contains the following components by mass percentage: 9.2% silicon, 0.48% magnesium, 0.21% manganese, 0.26% copper, 0.84% ​​iron, 0.17% nickel, 0.25% zinc, 0.11% tin, and aluminum.

[0062] Comparative Example 2

[0063] Commercially available 6061 aluminum alloy is gas-blasted into powder and then 3D-printed to form aluminum alloy workpieces. The 6061 aluminum alloy contains the following components, by mass: 0.8% to 1.2% magnesium, 0.4% to 0.8% silicon, 0.15% to 0.4% copper, 0.25% zinc, 0.04% to 0.35% chromium, 0.15% manganese, and aluminum.

[0064] The mechanical properties of the aluminum alloy workpieces of Examples 1-5 and Comparative Examples 1-2 were tested in accordance with the standard of GB / T 228-2010. The test results are shown in Table 1 below.

[0065] In this embodiment, the formed aluminum alloy workpiece may be anodized to form an anodic film on the surface of the aluminum alloy workpiece. The anodic film may further protect the aluminum alloy workpiece from corrosion.

[0066] Aluminum alloy workpieces prepared in Examples 1-5 and Comparative Examples 1-2 were anodized to form anodic films attached to the aluminum alloy workpieces. The aluminum alloy workpieces with the anodic films were then immersed in a 3.5 wt% sodium chloride aqueous solution and tested for corrosion resistance (according to ASTM G44). The results are shown in Table 1 below.

[0067] Table 1: Performance test results of each workpiece

[0068]

[0069] From the test results in Table 1, it can be seen that the tensile strength of the aluminum alloy workpiece in the embodiment of the present application is higher than that in the comparative example 1 (AlSi 10 Mg alloy), but the elongation is higher than that of Comparative Example 1, and the corrosion current density is lower than that of Comparative Example 1. This shows that the aluminum alloy workpiece of the embodiment of the present application is not as good as that of Comparative Example 1 in tensile strength (but the difference is not large), and the plasticity and corrosion resistance are significantly better than those of Comparative Example 1.

[0070] Looking at 6061 aluminum alloy, the alloy workpiece obtained by 3D printing has a large number of cracks, resulting in extremely low tensile strength and elongation, as well as a high corrosion current density. Therefore, 6061 aluminum alloy is not suitable for 3D printing.

[0071] Example 6

[0072] The aluminum alloy workpieces produced by 3D printing in Examples 1-5 were cooled to room temperature, then removed and placed in a vacuum annealing furnace for aging heat treatment at 225°C for 5 hours. After heat treatment, the aluminum alloy workpieces were removed and observed. The surfaces of the aluminum alloy workpieces produced by 3D printing in each example were smooth, intact, and free of cracks. Mechanical properties of the heat-treated aluminum alloy workpieces in Examples 1-5 were tested according to GB / T 228-2010. The test results are shown in Table 2 below.

[0073] Table 2: Mechanical properties test results of each workpiece

[0074] Workpiece Tensile strength / MPa Elongation / % Example 1 463 10 Example 2 480 10 Example 3 492 11 Example 4 486 11 Example 5 471 10

[0075] As can be seen from the test results in Table 2, the mechanical properties of the aluminum alloy workpiece produced by 3D printing in this embodiment changed after aging heat treatment, with the tensile strength increasing by 35-40 MPa and the elongation decreasing by 1-2 percentage points, so that the material can meet the needs of more application scenarios.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An aluminum alloy material suitable for 3D printing, characterized in that: The following elemental compositions are included in percentage by mass: 1.6 wt% to 2.2 wt% Si; 0.3 wt% to 0.6 wt% Mg; 0.8 wt% to 1.2 wt% Cu; 0.7 to 1.1 wt% Zn; 0.4 wt% to 0.8 wt% Ti; 0.1 wt% to 0.3 wt% of Sr; 0.05 wt% to 0.2 wt% of Y; The balance is Al and inevitable impurities.

2. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The following elemental compositions are included in percentage by mass: 1.6 wt% Si, 0.3 wt% Mg, 0.8 wt% Cu, 0.7 wt% Zn, 0.4 wt% Ti, 0.1 wt% Sr, 0.05 wt% Y, and the balance being Al and unavoidable impurities.

3. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The following elemental compositions are included in percentage by mass: 1.8 wt% Si, 0.4 wt% Mg, 0.9 wt% Cu, 0.8 wt% Zn, 0.5 wt% Ti, 0.15 wt% Sr, 0.08 wt% Y, and the balance being Al and unavoidable impurities.

4. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The following elemental compositions are included in percentage by mass: 1.9 wt% Si, 0.5 wt% Mg, 1.0 wt% Cu, 0.9 wt% Zn, 0.6 wt% Ti, 0.2 wt% Sr, 0.1 wt% Y, and the balance being Al and unavoidable impurities.

5. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The following elemental compositions are included in percentage by mass: 2.0 wt% of Si, 0.5 wt% of Mg, 1.0 wt% of Cu, 1.0 wt% of Zn, 0.7 wt% of Ti, 0.25 wt% of Sr, 0.15 wt% of Y, and the balance being Al and unavoidable impurities.

6. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The following elemental compositions are included in percentage by mass: 2.2 wt% of Si, 0.6 wt% of Mg, 1.2 wt% of Cu, 1.1 wt% of Zn, 0.8 wt% of Ti, 0.3 wt% of Sr, 0.2 wt% of Y, and the balance being Al and unavoidable impurities.

7. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The aluminum alloy 3D printing steps are as follows: Heat the aluminum alloy material to 780-800℃ and melt it. Keep it warm for 30 minutes and then pressurize it to 20-25bar to atomize it. 3 / min flow rate is ejected and cooled to form an aluminum alloy material powder with consistent and uniform composition; the obtained aluminum alloy powder is first dried at 85-95°C for 4.5h, and then 3D printed using a metal powder bed 3D printing device to form an aluminum alloy object, and argon is introduced into the printing chamber before printing to control the oxygen content below 200ppm. At the same time, the substrate temperature is preheated to 90°C, and the 3D printing parameters are set as follows: scanning rate of 1000-1100mm / s, scanning power of 300-400W, thickness of each layer of aluminum alloy powder of 35-45 microns, and scanning spacing of 60-80 microns.

8. The aluminum alloy material suitable for 3D printing according to claim 7, characterized in that: The particle size of the aluminum alloy material powder is preferably 35 μm to 55 μm.

9. The aluminum alloy material suitable for 3D printing according to claim 7, characterized in that: The aluminum alloy object obtained by 3D printing was cooled to room temperature and then placed in a vacuum annealing furnace for aging heat treatment, wherein the heat treatment temperature was 225° C. and the holding time was 5 h.

10. The aluminum alloy material suitable for 3D printing according to claim 1, characterized in that: The tensile strength of the aluminum alloy object is 425-452 MPa, the elongation is 12%, and the corrosion current density is 6.45x10 -6 -6.89x10 -6 A / cm 2 .

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