Aluminum alloy powder and methods of making and using the same

Abstract

This invention provides an aluminum alloy powder, its preparation method, and its application method. The aluminum alloy powder, by mass percentage, comprises the following components: Zr: 1.0-4.0 wt%, Gd: 0.5-2.0 wt%, Mg: 0.8-2.0 wt%, Si: 0.3-1.0 wt%, Cr: 0.5-1.0 wt%, Cu: 0.8-2.0 wt%, with the remainder being Al. The mass ratio of Zr to Gd is 2:1, and the mass ratio of Mg to Cu is 1:1. This invention can significantly improve the strength and toughness of the prepared aluminum alloy powder. Simultaneously, by adapting the process, it improves the production efficiency of structural load-bearing components.

Description

Technical Field

[0001] This invention relates to the field of new materials technology, and in particular to an aluminum alloy powder, its preparation method, and its application method. Background Technology

[0002] With the continuous development of the aviation industry, higher requirements have been placed on the aircraft fuselage. Currently, the aircraft fuselage is mainly connected and fixed by welding and riveting. Among its main base materials, aluminum alloy accounts for the largest proportion, reaching 50%-70% of the material usage, making it the most effective material for reducing aircraft weight.

[0003] Currently, laser additive manufacturing technology has been applied to aircraft production. It mainly integrates computer-aided design, material processing and forming technology, and uses digital model files as a basis to manufacture physical objects from specific metallic materials, non-metallic materials and medical biomaterials in a unique way through software and numerical control systems.

[0004] Among existing technologies, Al-Si alloys are most suitable for laser additive manufacturing. However, the finished materials made from Al-Si alloys by laser additive manufacturing have low tensile strength and poor toughness. In addition, although Al-Mg alloys have good strength properties, a large amount of rare earth elements need to be added during the production process. Rare earth elements are expensive, and they can react with crucibles and inert gases, making them difficult to adapt to the production of structural load-bearing components and reducing the production efficiency of aircraft. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an aluminum alloy powder, its preparation method and application method, so as to solve the problem that the finished material prepared by laser additive manufacturing process has low tensile strength and poor toughness.

[0006] An embodiment of the present invention provides an aluminum alloy powder, wherein, by mass percentage, it comprises the following components:

[0007] Zr: 1.0-4.0 wt%, Gd: 0.5-2.0 wt%, Mg: 0.8-2.0 wt%, Si: 0.3-1.0 wt%, Cr: 0.5-1.0 wt%, Cu: 0.8-2.0 wt%, with the remainder being Al. The mass ratio of Zr to Gd is 2:1, and the mass ratio of Mg to Cu is 1:1.

[0008] The beneficial effects of this invention are as follows: By using Gd and Zr elements for composite strengthening in the Al matrix, a large number of dispersed fine primary phases can be generated in the Al matrix. Furthermore, with subsequent heat treatment, these primary phases can inhibit the recrystallization of the structure and change the dislocation movement from sliding to torsion, thereby significantly improving the material strength of the aluminum alloy powder and the aluminum alloy, while also having high plasticity. This enables the preparation of aluminum alloys with high toughness and high strength. Combined with appropriate processes, this improves the manufacturing efficiency of structural load-bearing components, thereby improving the production efficiency of aircraft.

[0009] Furthermore, the raw materials for aluminum alloy powder are combinations of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy.

[0010] Furthermore, the mass ratio of Si to Cr is 1:1.

[0011] A second aspect of this invention provides a method for preparing aluminum alloy powder, wherein the method for preparing the aluminum alloy powder as described above includes:

[0012] Weigh out the specified proportions of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy and place them in a sodium hydroxide solution for corresponding oxidation treatment. The oxidation time is 2-3 minutes.

[0013] The oxidized aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy are placed in a melting furnace, and the inside of the melting furnace is evacuated to a vacuum state;

[0014] Nitrogen gas is introduced into the furnace, and the corresponding molten metal is produced through the furnace.

[0015] The molten metal is kept at a constant temperature to obtain a uniform molten metal, and the uniform molten metal is then subjected to high-speed atomization to prepare the aluminum alloy powder.

[0016] Furthermore, the step of weighing aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy in a predetermined proportion and placing them in a sodium hydroxide solution for corresponding oxidation treatment includes:

[0017] The aluminum-zirconium alloy, the aluminum-gadolinium alloy, the pure magnesium and aluminum-silicon alloy, the aluminum-chromium alloy, and the aluminum-copper alloy are mixed to generate corresponding mixed metal blocks, and the mixed metal blocks are placed in the prepared sodium hydroxide solution to remove the oxide layer on the surface of the mixed metal blocks.

[0018] The oxidized mixed metal blocks are dried for 5-8 minutes.

[0019] Furthermore, after the step of performing high-speed atomization treatment on the uniform molten metal to prepare the aluminum alloy powder, the method further includes:

[0020] When the aluminum alloy powder is obtained, it is transferred to a sorting machine to screen out finished aluminum alloy powders with different particle sizes.

[0021] Isostatic pressing was performed on finished aluminum alloy powders of different particle sizes to prepare aluminum alloy substrates accordingly.

[0022] Furthermore, the method also includes:

[0023] Prepare an aqueous polyurethane resin solution and add the aqueous polyurethane resin solution to an ultrasonic cleaner;

[0024] The ultrasonic cleaner is activated, and the aluminum alloy powder is added to the aqueous polyurethane resin solution so that the aluminum alloy powder is suspended in the middle of the aqueous polyurethane resin solution and the corresponding cleaning is completed.

[0025] A third aspect of this invention provides a method for applying aluminum alloy powder obtained by the preparation method described above, wherein the application method includes the following steps:

[0026] The aluminum alloy powder is used as the basic 3D printing material, and the target three-dimensional model is obtained by the user in real time.

[0027] The basic 3D printing material and the target 3D model are simultaneously input into a preset fiber laser SLM printer to produce the corresponding 3D printed product based on the size of the target 3D model.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is a schematic flowchart of an aluminum alloy powder preparation method according to an embodiment of the present invention.

[0030] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figure 1 The image shows an aluminum alloy powder in one embodiment of the present invention. The aluminum alloy powder provided in this embodiment has high strength and high toughness, which can well meet the requirements of structural load-bearing components. At the same time, it improves the manufacturing efficiency of aircraft by adapting to the process.

[0035] Specifically, the aluminum alloy powder provided in this embodiment comprises, by mass percentage, the following components:

[0036] Zr: 1.0-4.0 wt%, Gd: 0.5-2.0 wt%, Mg: 0.8-2.0 wt%, Si: 0.3-1.0 wt%, Cr: 0.5-1.0 wt%, Cu: 0.8-2.0 wt%, with the remainder being Al. The mass ratio of Zr to Gd is 2:1, and the mass ratio of Mg to Cu is 1:1.

[0037] Furthermore, the raw materials for aluminum alloy powder are combinations of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy.

[0038] Furthermore, the mass ratio of Si to Cr is 1:1.

[0039] A second aspect of this invention provides a method for preparing aluminum alloy powder, wherein the method for preparing the aluminum alloy powder as described above includes:

[0040] Step S10: Weigh out the aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy in a set ratio and place them in a sodium hydroxide solution for corresponding oxidation treatment. The oxidation time is 2-3 minutes; preferably, for example, it can be 2 minutes, 2.5 minutes and 3 minutes.

[0041] Step S20: The oxidized aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy are placed in a melting furnace, and the interior of the melting furnace is evacuated to a vacuum state; wherein, the vacuum degree inside the melting furnace is evacuated to 100 Pa.

[0042] Step S30: Nitrogen gas is introduced into the furnace and the corresponding molten metal is produced through the furnace; wherein, the alloy is produced into the molten metal inside the furnace at an temperature of 1200-1300°C.

[0043] Step S40: The molten metal is kept at a constant temperature to obtain a uniform molten metal, and then subjected to high-speed atomization to prepare the aluminum alloy powder. Preferably, the molten metal is kept at 900-1100°C for 5-10 minutes, for example, it can be kept at 900°C for 8 minutes.

[0044] Furthermore, the step of weighing aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy in a predetermined proportion and placing them in a sodium hydroxide solution for corresponding oxidation treatment includes:

[0045] The aluminum-zirconium alloy, the aluminum-gadolinium alloy, the pure magnesium and aluminum-silicon alloy, the aluminum-chromium alloy, and the aluminum-copper alloy are mixed to generate corresponding mixed metal blocks. The mixed metal blocks are then placed in a prepared sodium hydroxide solution to remove the oxide layer on the surface of the mixed metal blocks. By using a sodium hydroxide solution, the oxide layer that has reacted with oxidation on the surface of the alloys can be effectively removed, thereby improving the purity of the alloys. This also allows the alloys to undergo more complete reactions in subsequent processes, and improves the production efficiency of aluminum alloy powder by adapting the process.

[0046] The oxidized mixed metal blocks are dried for 5-8 minutes.

[0047] Furthermore, after the step of performing high-speed atomization treatment on the uniform molten metal to prepare the aluminum alloy powder, the method further includes:

[0048] When the aluminum alloy powder is obtained, it is transferred to a sorting machine to screen out finished aluminum alloy powders with different particle sizes.

[0049] Different particle sizes of finished aluminum alloy powders are subjected to isostatic pressing to prepare corresponding aluminum alloy substrates. Specifically, the aluminum alloy substrate can be a metal part with various structures to facilitate subsequent use.

[0050] Furthermore, the method also includes:

[0051] Prepare an aqueous polyurethane resin solution and add the aqueous polyurethane resin solution to an ultrasonic cleaner;

[0052] The ultrasonic cleaner is activated, and the aluminum alloy powder is added to the aqueous polyurethane resin solution. This causes the aluminum alloy powder to suspend in the middle of the solution, completing the cleaning process. Because the density of the aluminum alloy powder is greater than that of the aqueous polyurethane resin solution, the powder will sink to the bottom. Therefore, to ensure thorough cleaning, the ultrasonic cleaner is activated simultaneously. The ultrasonic waves cause the powder to rise to the center of the solution, allowing for comprehensive cleaning.

[0053] A third aspect of this invention provides a method for applying aluminum alloy powder obtained by the preparation method described above, wherein the application method includes the following steps:

[0054] The aluminum alloy powder is used as the basic 3D printing material, and the target three-dimensional model is obtained by the user in real time.

[0055] The basic 3D printing material and the target 3D model are simultaneously input into a preset fiber laser SLM printer to produce the corresponding 3D printed product based on the size of the target 3D model.

[0056] Additionally, it should be noted that during the actual printing process, the printer board temperature is controlled between 120-140℃, the laser power between 208-370W, the scanning speed between 1300-1690mm / s, the scanning spacing between 0.1-0.15mm, the scanning layer thickness between 0.03-0.09mm, and the area overlap is set to 0.14mm. After printing, the finished product is obtained by sequentially annealing, wire cutting, and surface treatment.

[0057] Furthermore, to facilitate understanding of the present invention, several embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0058] Example 1:

[0059] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 1.0 wt%, Gd: 0.5 wt%, Mg: 0.8 wt%, Si: 0.5 wt%, Cr: 0.5 wt%, Cu: 0.8 wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1250°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 120°C, and the laser power is controlled at 280W, the scanning speed at 1300mm / s, the scanning spacing at 0.1mm, the scanning layer thickness at 0.03mm, and the area overlap at 0.14mm, in order to finally print out the corresponding finished product.

[0060] Example 2:

[0061] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 1.6wt%, Gd: 0.8wt%, Mg: 1.0wt%, Si: 0.6wt%, Cr: 0.6wt%, Cu: 1.0wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1260°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 125°C, and the laser power is controlled at 290W, the scanning speed at 1400mm / s, the scanning spacing at 0.11mm, the scanning layer thickness at 0.04mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0062] Example 3:

[0063] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 2.0 wt%, Gd: 1.0 wt%, Mg: 0.9 wt%, Si: 0.7 wt%, Cr: 0.7 wt%, Cu: 0.9 wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1270°C. The molten metal is then kept at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 130°C, and the laser power is controlled at 310W, the scanning speed at 1450mm / s, the scanning spacing at 0.12mm, the scanning layer thickness at 0.05mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0064] Example 4:

[0065] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 3.0 wt%, Gd: 1.5 wt%, Mg: 0.85 wt%, Si: 0.8 wt%, Cr: 0.8 wt%, Cu: 0.85 wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1280°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 135°C, and the laser power is controlled at 320W, the scanning speed at 1500mm / s, the scanning spacing at 0.13mm, the scanning layer thickness at 0.06mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0066] Example 5:

[0067] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 4.0 wt%, Gd: 2.0 wt%, Mg: 0.88 wt%, Si: 0.95 wt%, Cr: 0.95 wt%, Cu: 0.88 wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1290°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 136°C, and the laser power is controlled at 330W, the scanning speed at 1550mm / s, the scanning spacing at 0.14mm, the scanning layer thickness at 0.07mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0068] Example 6:

[0069] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 3.8wt%, Gd: 1.9wt%, Mg: 0.85wt%, Si: 0.9wt%, Cr: 0.9wt%, Cu: 0.85wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1290°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 136°C, and the laser power is controlled at 335W, the scanning speed at 1550mm / s, the scanning spacing at 0.15mm, the scanning layer thickness at 0.08mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0070] Example 7:

[0071] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 3.6wt%, Gd: 1.8wt%, Mg: 0.9wt%, Si: 0.85wt%, Cr: 0.85wt%, Cu: 0.9wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1295°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 139°C, and the laser power is controlled at 340W, the scanning speed at 1600mm / s, the scanning spacing at 0.15mm, the scanning layer thickness at 0.08mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0072] Example 8:

[0073] Weigh out the required amounts of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium, aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy according to the following mass percentages: Zr: 3.2wt%, Gd: 1.6wt%, Mg: 0.95wt%, Si: 0.66wt%, Cr: 0.66wt%, Cu: 0.95wt%, with the balance being Al. Place all the above alloys in a melting furnace. Further, evacuate the inside of the melting furnace to a vacuum, then introduce nitrogen gas to atmospheric pressure, and melt it into a molten metal at a temperature of 1266°C. The molten metal is then held at this temperature and allowed to stand, followed by high-speed atomization. The outlet angle of the atomization disk annular slit is 63 degrees, finally obtaining aluminum alloy powder. Further, clean the aluminum alloy powder with the aforementioned aqueous polyurethane resin solution, and then perform subsequent printing. Furthermore, the printer board is preheated to 126°C, and the laser power is controlled at 360W, the scanning speed at 1690mm / s, the scanning spacing at 0.12mm, the scanning layer thickness at 0.09mm, and the area overlap at 0.14mm, in order to finally print the corresponding finished product.

[0074] Furthermore, the parameters in the above embodiments are shown in Table 1 below:

[0075] Table 1

[0076]

[0077]

[0078]

[0079] Furthermore, in practical applications, the finished products prepared in Examples 1 to 8 were subjected to strength and toughness tests, and the specific test data are shown in Table 2 below:

[0080] Table 2

[0081]

[0082] In summary, the aluminum alloy powder, its preparation method, and its application method in the above embodiments of the present invention can achieve high strength and high toughness through the combination of elements, thereby enabling the preparation of aluminum alloy products with high strength and high toughness, and improving manufacturing efficiency with corresponding processes.

[0083] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An aluminum alloy powder, characterized in that, By mass percentage, it includes the following components: Zr: 1.0-4.0 wt%, Gd: 0.5-2.0 wt%, Mg: 0.8-2.0 wt%, Si: 0.3-1.0 wt%, Cr: 0.5-1.0 wt%, Cu: 0.8-2.0 wt%, with the remainder being Al. The mass ratio of Zr to Gd is 2:1, and the mass ratio of Mg to Cu is 1:

1. The raw materials for aluminum alloy powder are aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy; The mass ratio of Si to Cr is 1:1; The method for preparing the aluminum alloy powder is as follows: Weigh out the specified proportions of aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy and place them in sodium hydroxide solution for corresponding deoxidation treatment, the deoxidation time is 2-3 minutes; The deoxidized aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy and aluminum-copper alloy are placed in a melting furnace, and the inside of the melting furnace is evacuated to a vacuum state; Nitrogen gas is introduced into the furnace, and the corresponding molten metal is produced through the furnace. The molten metal is kept at a constant temperature to obtain a uniform molten metal, and the uniform molten metal is then subjected to high-speed atomization to prepare the aluminum alloy powder.

2. The method for preparing aluminum alloy powder according to claim 1, characterized in that: The step of weighing aluminum-zirconium alloy, aluminum-gadolinium alloy, pure magnesium and aluminum-silicon alloy, aluminum-chromium alloy, and aluminum-copper alloy in a predetermined proportion and placing them in a sodium hydroxide solution for corresponding deoxidation treatment includes: The aluminum-zirconium alloy, the aluminum-gadolinium alloy, the pure magnesium and aluminum-silicon alloy, the aluminum-chromium alloy, and the aluminum-copper alloy are mixed to generate corresponding mixed metal blocks, and the mixed metal blocks are placed in the prepared sodium hydroxide solution to remove the oxide layer on the surface of the mixed metal blocks. The deoxidized mixed metal blocks are dried for 5-8 minutes.

3. A method for applying the aluminum alloy powder as described in claim 1, characterized in that: The application method includes the following steps: The aluminum alloy powder is used as the basic 3D printing material, and the target three-dimensional model is obtained by the user in real time. The basic 3D printing material and the target 3D model are simultaneously input into a preset fiber laser SLM printer to produce the corresponding 3D printed product based on the size of the target 3D model.

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