Heat-resistant, high-strength and corrosion-resistant aluminum alloy powder, preparation method, additive part and additive manufacturing method

Abstract

The invention provides heat-resistant, high-strength and corrosion-resistant aluminum alloy powder and a preparation method thereof, an additive part and an additive manufacturing method. The heat-resistant, high-strength and corrosion-resistant aluminum alloy powder is prepared from, by mass, 2.5-5% of Mg, 0.5-5% of Cr, 0.1-1.5% of Mn, 0.1-1.5% of Sc, 0.1-1.0% of Zr and the balance Al and inevitable impurities, and the total content of the impurities does not exceed 0.3%. According to the heat-resistant, high-strength and corrosion-resistant aluminum alloy powder and the preparation method thereof, the additive part and the additive manufacturing method, the spherical powder is prepared through a smelting-gas atomization process, optimized laser powder bed melting (LPBF) parameters are combined, and a sample subjected to heat treatment is free of cracks, high in density, yield strength and tensile strength and excellent in high-temperature stability.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing technology, and in particular relates to a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder and its preparation method, additive parts, and additive manufacturing method. Background Technology

[0002] With the ever-increasing demand for lightweight, high-strength materials in modern industry, aluminum alloys, with their high specific strength, excellent corrosion resistance, and good machinability, have become important materials in aerospace, automotive, shipbuilding, and construction industries. Traditional aluminum alloys can be divided into wrought aluminum alloys and cast aluminum alloys, mainly used for structural components requiring high strength and good ductility. In recent years, the development of additive manufacturing (3D printing) technology, especially laser powder bed melting (LPBF) technology, has brought new breakthroughs to the manufacturing of aluminum alloys. LPBF technology can achieve the precise manufacturing of complex structural components by melting metal powder layer by layer, and can produce complex geometric structures that are difficult to achieve with traditional processes, such as embedded cooling channels and lightweight honeycomb structures. It improves material utilization and reduces material waste in the production process; by optimizing laser process parameters, it can achieve microstructure refinement, such as grain refinement and the transformation of columnar crystals to equiaxed crystals.

[0003] However, the mechanical properties of additively manufactured aluminum alloys at high temperatures remain a challenge. Traditional LPBF-formed aluminum alloys typically exhibit good strength at room temperature, but due to the instability of the alloy microstructure, their high-temperature strength decays rapidly, making it difficult to meet the requirements of aerospace and high-temperature service environments. Furthermore, the synergistic improvement of room-temperature and high-temperature strength has always been a challenge; existing alloy systems often sacrifice some room-temperature strength while improving high-temperature performance. To overcome this limitation, we developed a novel Al-Cr-Mg-Sc alloy. This alloy system achieves superior overall performance by precisely controlling the proportions of Cr, Mg, and Sc elements and introducing appropriate amounts of X-strengthening elements to optimize the microstructure. Summary of the Invention

[0004] The purpose of this invention is to provide a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder and its preparation method, additive parts, and additive manufacturing method. Spherical powder is prepared by a melting-gas atomization process. Combined with optimized laser powder bed melting (LPBF) parameters, the sample after heat treatment is free of cracks, has a density >99.9%, a yield strength >560MPa, and a tensile strength >610MPa. It also has excellent high-temperature stability (strength retention rate >78% at 200℃ and strength retention rate >54% at 250℃).

[0005] To achieve the above objectives, the present invention provides a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder, comprising, by mass percentage: Mg 2.5~5%, Cr 0.5~5.0%, Mn 0.1~1.5%, Sc 0.1~1.5%, Zr 0.1~1.0%, with the balance being Al and unavoidable impurities, the total impurity content not exceeding 0.3%.

[0006] Preferably, it contains, by mass percentage: Mg 4.5%, Cr 3.0%, Mn 0.5%, Sc 0.8%, Zr 0.3%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

[0007] Preferably, it contains, by mass percentage: Mg 4.5%, Cr 1.5%, Mn 0.5%, Sc 0.8%, Zr 0.3%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

[0008] Preferably, it contains, by mass percentage: Mg 4.5%, Cr 4.5%, Mn 0.5%, Sc 0.8%, Zr 0.3%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

[0009] Preferably, it contains, by mass percentage: Mg 3.0%, Cr 3.0%, Mn 0.5%, Sc 0.8%, Zr 0.3%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

[0010] Preferably, it contains, by mass percentage: Mg 3.0%, Cr 3%, Mn 1.5%, Sc 0.8%, Zr 0.3%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

[0011] A method for preparing heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder includes the following steps: Alloy melting: Pure aluminum, pure magnesium, pure zirconium, pure manganese, Al-Cr master alloy, and Al-Sc master alloy are placed in a vacuum induction melting furnace, vacuumed, filled with protective gas, heated and melted, and then cast into master alloy ingots after holding at the temperature. Gas atomization powder preparation: The master alloy ingot is remelted under argon protection and spherical powder is prepared by gas atomization system, which is the heat-resistant, high-strength and corrosion-resistant alloy powder.

[0012] Preferably, after airflow classification, the particle size distribution of the atomized powder satisfies D10≥12μm, D90≤50μm, and sphericity>0.85.

[0013] Preferably, the particle size of the spherical powder is 0-150 μm. When the particle size of the spherical powder is 15-53 μm, it is used for LPBF laser powder bed fusion molding; when the particle size of the spherical powder is 0-20 μm, it is used for microprinting or metal injection molding; when the particle size of the spherical powder is 45-150 μm, it is used for directional energy deposition printing.

[0014] Preferably, the alloy melting temperature is 950-1050℃, the holding time is 40-60min, the vacuum degree is 100Pa, and the remelting temperature is 900-1000℃.

[0015] An additive manufacturing method for aluminum alloy powder includes the following steps: The alloy powder is vacuum dried at 120-150℃ for 6-12 hours, and then used for additive manufacturing. Preferably, the additive manufacturing processes used for the alloy powder include high-energy beam additive manufacturing such as laser bed fusion (LPBF), electron beam bed fusion (EB-PBF), and directed energy deposition (DED), as well as 3D printing binder jetting (BJ) and selective laser sintering (SLS). Metal Injection Molding ( MIM Powder metallurgy and sintering processes, etc.

[0016] As a typical additive manufacturing method, LPBF (Laser-Based Powder Bed Fusion) involves uniformly spreading dried alloy powder onto a forming platform to form a thin layer of 10–200 μm. Excess powder is collected in a powder collection tank. A laser beam is focused on the powder surface along a CAD slicing path, selectively melting the powder to form a molten pool and rapidly solidifying it into the cross-section of the part. The forming platform then descends by one layer thickness, and the powder spreading and scanning process is repeated until the part is completed. Unmelted powder can be recycled and reused. The process parameters for LPBF include: laser power 300-450W, scanning speed 800-1400 mm / s, scanning spacing 0.08-0.12 mm, layer thickness 0.03-0.05 mm, and a nitrogen protective atmosphere.

[0017] Preferably, the additively manufactured parts are subjected to heat treatment, which includes heating to 275~325℃ and holding for 1~12 hours; after the holding time, they are air-cooled.

[0018] An additive manufacturing method based on aluminum alloy powder to produce an additive part.

[0019] Therefore, the present invention employs the above-mentioned heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder and its preparation method, additive parts, and additive manufacturing method, and the technical effects are as follows: (1) This invention utilizes the high cooling rate and solute retention characteristics of 3D printing technology to achieve multi-dimensional performance optimization through a Cr-Mg-Sc synergistic strengthening mechanism. Cr element dominates high-temperature strengthening: By introducing 0.5~3.0wt% Cr, nanoscale Al7Cr intermetallic compounds are formed during rapid solidification. This phase has excellent thermal stability (decomposition temperature > 400℃) and significantly inhibits material softening at high temperatures (250~350℃) by pinning grain boundaries and dislocations. Mg element ensures room temperature strength: By controlling the Mg content to 2.5~5wt%, at ultra-high cooling rates (10 wt%) of LPBF, the Mg element effectively strengthens the material at room temperature. 6 At K / s, a supersaturated solid solution is formed, providing solid solution strengthening. At the same time, Mg and Sc work together to promote the uniform precipitation of high-density Al3(Sc,Zr) nanophase (size 5~15nm) in subsequent heat treatment, achieving a balance between room temperature and high temperature strength.

[0020] (2) Cr element also promotes the formation of dense Cr2O3-Al2O3 composite oxide film, thereby improving the corrosion resistance of additive manufacturing aluminum alloy. Attached Figure Description

[0021] Figure 1 This is a diagram showing the room temperature and high temperature tensile properties of a high-strength Al-Cr-Mg-Sc-Zr alloy powder after 3D printing and heat treatment in this invention. Figure 2 The printed room temperature tensile properties of the AlMgScZr alloy prepared in Comparative Example 1 are shown. Figure 2 (a) Room temperature engineering strain of AlMgScZr alloy prepared in Comparative Example 1 in the printed state; Figure 2 (b) shows the actual room temperature strain of the AlMgScZr alloy prepared in Comparative Example 1 in the printed state; Figure 3 The tensile properties of the AlMgScZr alloy prepared in Comparative Example 1 at room temperature after heat treatment. Figure 3 (a) is the engineering strain of the AlMgScZr alloy prepared in Comparative Example 1 at room temperature after heat treatment; Figure 3 (b) is the actual strain of the AlMgScZr alloy prepared in Comparative Example 1 at room temperature after heat treatment; Figure 4 The tensile properties of the AlMgScZr alloy prepared in Comparative Example 1 at 250℃; Figure 4 The engineering strain of the AlMgScZr alloy prepared in Comparative Example 1 at 250℃; Figure 4 The actual strain of the AlMgScZr alloy prepared in Comparative Example 1 at 250℃; Figure 5 The tensile properties of the AlMgScZr alloy prepared in Comparative Example 1 at 300℃; Figure 5(a) Engineering strain of the AlMgScZr alloy prepared in Comparative Example 1 at 300 °C; Figure 5 (b) is the actual strain of the AlMgScZr alloy prepared in Comparative Example 1 at 300 °C. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0024] This invention adds an appropriate amount of Cr to aluminum alloys, thereby suppressing crack formation and providing higher high-temperature strength by rationally controlling the precipitation of Al-Cr intermetallic compounds. Optimizing the Cr content not only avoids excessive compound precipitation but also enhances the mechanical properties of the alloy. Furthermore, the addition of an appropriate amount of Mg further enhances the solid solution strengthening effect of the alloy, thereby increasing its room-temperature strength.

[0025] To improve the high-temperature strength and thermal stability of 3D-printed aluminum alloys, this invention also adds an appropriate amount of Sc element to form an Al3(Sc) precipitate phase with high thermal stability. Sc element effectively enhances the strength and stability of aluminum alloys at high temperatures by refining grains and improving precipitation strengthening, making it particularly suitable for applications requiring high-temperature strength.

[0026] Example 1 The composition and mass percentage of a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder are as follows: Cr: 3.0%, Mg: 4.5%, Sc: 0.8%, Zr: 0.3%, Mn: 0.5%, with the balance being Al.

[0027] (1) Alloy smelting: Based on the content of raw materials in the above aluminum alloy powder, weigh the corresponding mass of pure aluminum, pure magnesium, pure manganese, pure zirconium, aluminum-chromium, and aluminum-scandium alloys, and place them in a smelting furnace. Evacuate the smelting furnace to a vacuum degree below 100 Pa, and then fill it with argon gas to bring the pressure inside the smelting furnace to atmospheric pressure. Heat the smelting furnace to 980°C to completely melt the raw materials into a liquid, and then hold it at that temperature for 45 minutes. Then, cast the alloy melt into a master alloy ingot in a vacuum chamber, and remove the ingot after 5 minutes for air cooling.

[0028] (2) Gas atomization powder preparation: The master alloy ingot is remelted to 900-1000℃ under argon protection. After complete melting, it is held at the temperature for 20 minutes. Then, the molten alloy liquid is blown into fine droplets by a high-speed argon atomizer. After solidification, it forms spherical alloy powder. The original powder is then sieved with a vibrating screen to obtain powder that meets the requirements of 3D printing.

[0029] (3) Preparation of Al-Cr-Mg-Sc-Zr alloy components: The sieved aluminum alloy powder was vacuum dried. The dried aluminum alloy powder was printed using a laser powder bed melting device, wherein the laser power was 400W, the scanning speed was 1000mm / s, the scanning spacing was 0.1mm, and the powder layer thickness was 0.03mm.

[0030] (4) Heat treatment of Al-Cr-Mg-Sc-Zr alloy components: The printed samples were heat treated at 300℃ for 5 hours, followed by air cooling to room temperature. The final sample had a room temperature yield strength of 560 MPa and a tensile strength of 610 MPa.

[0031] The performance of the Al-Cr-Mg-Sc-Zr alloy components prepared in Example 1 was tested, and the specific test data are shown in Table 1. Figures 1 to 5 as follows: Table 1 Performance data of Al-Cr-Mg-Sc-Zr alloy components at different temperatures

[0032] Example 2 The composition and mass percentage of a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder are as follows: Cr: 1.5%, Mg: 4.5%, Sc: 0.8%, Zr: 0.3%, Mn: 0.5%, with the balance being Al.

[0033] (1) Alloy smelting: Based on the content of raw materials in the above aluminum alloy powder, weigh the corresponding mass of pure aluminum, pure magnesium, pure manganese, pure zirconium, aluminum-chromium, and aluminum-scandium alloys, and place them in a smelting furnace. Evacuate the smelting furnace to a vacuum degree below 100 Pa, and then fill it with argon gas to bring the pressure inside the smelting furnace to atmospheric pressure. Heat the smelting furnace to 980°C to completely melt the raw materials into a liquid, and then hold it at that temperature for 45 minutes. Then, pour the alloy melt into an ingot in the vacuum chamber, and remove the ingot after 5 minutes for air cooling.

[0034] (2) Gas atomization powder preparation: The master alloy ingot is remelted to 900-1000℃ under argon protection. After complete melting, it is held at the temperature for 20 minutes. Then, the molten alloy liquid is blown into fine droplets by a high-speed argon atomizer. After solidification, it forms spherical alloy powder. The original powder is then sieved with a vibrating screen to obtain powder that meets the requirements of 3D printing.

[0035] (3) Preparation of Al-Cr-Mg-Sc-Zr alloy components: The sieved aluminum alloy powder was vacuum dried. The dried aluminum alloy powder was printed using a laser powder bed melting device, wherein the laser power was 400W, the scanning speed was 1000mm / s, the scanning spacing was 0.1mm, and the powder layer thickness was 0.03mm.

[0036] (4) Heat treatment of Al-Cr-Mg-Sc-Zr alloy components: The printed sample was heat treated at a temperature of 300℃ for 5 hours and then air-cooled to room temperature.

[0037] Example 3 The composition and mass percentage of a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder are as follows: Cr: 4.5%, Mg: 4.5%, Sc: 0.8%, Zr: 0.3%, Mn: 0.5%, with the balance being Al.

[0038] (1) Alloy smelting: Based on the content of raw materials in the above aluminum alloy powder, weigh the corresponding mass of pure aluminum, pure magnesium, pure manganese, pure zirconium, aluminum-chromium, and aluminum-scandium alloys, and place them in a smelting furnace. Evacuate the smelting furnace to a vacuum degree below 100 Pa, and then fill it with argon gas to bring the pressure inside the smelting furnace to atmospheric pressure. Heat the smelting furnace to 980°C to completely melt the raw materials into a liquid, and then hold it at that temperature for 45 minutes. Then, pour the alloy melt into an ingot in the vacuum chamber, and remove the ingot after 5 minutes for air cooling.

[0039] (2) Gas atomization powder preparation: The master alloy ingot is remelted to 900-1000℃ under argon protection. After complete melting, it is held at the temperature for 20 minutes. Then, the molten alloy liquid is blown into fine droplets by a high-speed argon atomizer. After solidification, it forms spherical alloy powder. The original powder is then sieved with a vibrating screen to obtain powder that meets the requirements of 3D printing.

[0040] (3) Preparation of Al-Cr-Mg-Sc-Zr alloy components: The sieved aluminum alloy powder was vacuum dried. The dried aluminum alloy powder was printed using a laser powder bed melting device, wherein the laser power was 400W, the scanning speed was 1000mm / s, the scanning spacing was 0.1mm, and the powder layer thickness was 0.03mm.

[0041] (4) Heat treatment of Al-Cr-Mg-Sc-Zr alloy components: The printed sample was heat treated at a temperature of 300℃ for 5 hours and then air-cooled to room temperature.

[0042] Example 4 The composition and mass percentage of a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder are as follows: Cr: 3.0%, Mg: 3.0%, Sc: 0.8%, Zr: 0.3%, Mn: 0.5%, with the balance being Al.

[0043] (1) Alloy smelting: Based on the content of raw materials in the above aluminum alloy powder, weigh the corresponding mass of pure aluminum, pure magnesium, pure manganese, pure zirconium, aluminum-chromium, and aluminum-scandium alloys, and place them in a smelting furnace. Evacuate the smelting furnace to a vacuum degree below 100 Pa, and then fill it with argon gas to bring the pressure inside the smelting furnace to atmospheric pressure. Heat the smelting furnace to 980°C to completely melt the raw materials into a liquid, and then hold it at that temperature for 45 minutes. Then, pour the alloy melt into an ingot in the vacuum chamber, and remove the ingot after 5 minutes for air cooling.

[0044] (2) Gas atomization powder preparation: The master alloy ingot is remelted to 900-1000℃ under argon protection. After complete melting, it is held at the temperature for 20 minutes. Then, the molten alloy liquid is blown into fine droplets by a high-speed argon atomizer. After solidification, it forms spherical alloy powder. The original powder is then sieved with a vibrating screen to obtain powder that meets the requirements of 3D printing.

[0045] (3) Preparation of Al-Cr-Mg-Sc-Zr alloy components: The sieved aluminum alloy powder was vacuum dried. The dried aluminum alloy powder was printed using a laser powder bed melting device, wherein the laser power was 400W, the scanning speed was 1000mm / s, the scanning spacing was 0.1mm, and the powder layer thickness was 0.03mm.

[0046] (4) Heat treatment of Al-Cr-Mg-Sc-Zr alloy components: The printed sample was heat treated at a temperature of 300℃ for 5 hours and then air-cooled to room temperature.

[0047] Example 5 The composition and mass percentage of a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder are as follows: Cr: 3.0%, Mg: 3.0%, Sc: 0.8%, Zr: 0.3%, Mn: 1.5%, with the balance being Al.

[0048] (1) Alloy smelting: Based on the content of raw materials in the above aluminum alloy powder, weigh the corresponding mass of pure aluminum, pure magnesium, pure manganese, pure zirconium, aluminum-chromium, and aluminum-scandium alloys, and place them in a smelting furnace. Evacuate the smelting furnace to a vacuum degree below 100 Pa, and then fill it with argon gas to bring the pressure inside the smelting furnace to atmospheric pressure. Heat the smelting furnace to 980°C to completely melt the raw materials into a liquid, and then hold it at that temperature for 45 minutes. Then, pour the alloy melt into an ingot in the vacuum chamber, and remove the ingot after 5 minutes for air cooling.

[0049] (2) Gas atomization powder preparation: The master alloy ingot is remelted to 900-1000℃ under argon protection. After complete melting, it is held at the temperature for 20 minutes. Then, the molten alloy liquid is blown into fine droplets by a high-speed argon atomizer. After solidification, it forms spherical alloy powder. The original powder is then sieved with a vibrating screen to obtain powder that meets the requirements of 3D printing.

[0050] (3) Preparation of Al-Cr-Mg-Sc-Zr alloy components: The sieved aluminum alloy powder was vacuum dried. The dried aluminum alloy powder was printed using a laser powder bed melting device, wherein the laser power was 400W, the scanning speed was 1000mm / s, the scanning spacing was 0.1mm, and the powder layer thickness was 0.03mm.

[0051] (4) Heat treatment of Al-Cr-Mg-Sc-Zr alloy components: The printed sample was heat treated at a temperature of 300℃ for 5 hours and then air-cooled to room temperature.

[0052] Comparative Example 1 For comparison with the embodiments of the present invention, a commercially available Al-Mg-Sc alloy was selected. Specific alloy data is shown in Table 2. The room temperature tensile strength of its additively manufactured components is 510-530 MPa; its high-temperature tensile strength at 250°C is ~150 MPa. This alloy exhibits a sharp decrease in strength at high temperatures, failing to meet the stringent high-temperature strength requirements of the aerospace field. In contrast, the Al-Cr-Sc alloy designed in this invention, through a reasonable element ratio and a unique 3D printing process, significantly improves the alloy's high-temperature strength and stability. This alloy demonstrates excellent mechanical properties even at high temperatures, meeting the high requirements of the aerospace field for high-temperature strength and reliability. Furthermore, the Al-Cr-Sc alloy in this invention maintains high strength at room temperature, giving it broader application prospects, especially suitable for structural components requiring high heat resistance and strength in the aerospace field.

[0053] Table 2 AlMgScZr powder data

[0054] In summary, the embodiments and comparative examples demonstrate that the aluminum alloy composition and process designed by this invention can simultaneously guarantee room temperature and high temperature strength, while also improving the corrosion resistance of the aluminum alloy, ultimately ensuring that components made from this alloy can meet the requirements of aerospace heat-bearing components.

[0055] Therefore, this invention employs the aforementioned heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder and its preparation method, additive parts, and additive manufacturing method. Spherical powders are prepared through a melting-gas atomization process. Combined with optimized laser powder bed melting (LPBF) parameters (laser power 300-450W, scanning speed 800-1500mm / s), the heat-treated samples are free of cracks, have a density >99.9%, a yield strength >560MPa, and a tensile strength >610MPa. They also exhibit excellent high-temperature stability (strength retention rate >78% at 200℃ and >54% at 250℃).

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder, characterized in that, It contains, by mass percentage: Mg 2.5~5%, Cr 0.5~5.0%, Mn 0.1~1.5%, Sc 0.1~1.5%, Zr 0.1~1.0%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

2. The heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder according to claim 1, characterized in that, It contains, by mass percentage: Mg 2.5~5%, Cr 1.0~5.0%, Mn 0.1~1.5%, Sc 0.1~1.5%, Zr 0.1~1.0%, with the balance being Al and unavoidable impurities, and the total impurity content not exceeding 0.3%.

3. The method for preparing a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder according to claim 1, characterized in that, Includes the following steps: Alloy melting: Pure aluminum, pure magnesium, pure zirconium, pure manganese, Al-Cr master alloy, and Al-Sc master alloy are placed in a vacuum induction melting furnace, vacuumed, filled with protective gas, heated and melted, and then cast into master alloy ingots after holding at the temperature. Gas atomization powder preparation: The master alloy ingot is remelted under argon protection and spherical powder is prepared by gas atomization system, which is the heat-resistant, high-strength and corrosion-resistant alloy powder.

4. The method for preparing a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder according to claim 3, characterized in that, After airflow classification, the particle size distribution of the atomized powder meets the following requirements: D10≥12μm, D90≤50μm, and sphericity>0.

85.

5. The method for preparing a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder according to claim 3, characterized in that, The particle size of the spherical powder is 0-150μm.

6. The method for preparing a heat-resistant, high-strength, and corrosion-resistant aluminum alloy powder according to claim 3, characterized in that, The alloy is smelted at a temperature of 950-1050℃, held for 30-60 minutes, and with a vacuum of less than 100Pa; the remelting temperature is 900-1000℃.

7. An additive manufacturing method based on the aluminum alloy powder of claim 1, characterized in that, Includes the following steps: The alloy powder is vacuum dried at 120-150℃ for 6-12 hours, and the dried alloy powder is used for additive manufacturing.

8. The additive manufacturing method based on aluminum alloy powder according to claim 7, characterized in that, The additively manufactured parts are subjected to heat treatment, which includes heating to 275~325℃ and holding for 1~12 hours; after holding, they are air-cooled.

9. An additive part prepared by an additive manufacturing method based on aluminum alloy powder according to any one of claims 7-8.

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