A method of laser additive manufacturing of beryllium aluminum alloys and the resulting beryllium aluminum alloys

Abstract

This invention discloses a method for laser additive manufacturing of beryllium-aluminum alloy and the obtained beryllium-aluminum alloy, comprising the following steps: A) Weighing pure beryllium powder with a purity of not less than 97 wt% and pure aluminum powder with a purity of not less than 99.5%, and mixing them in a beryllium-aluminum mass ratio of 60-65:35-40 to obtain a uniformly mixed beryllium-aluminum powder; B) Using the beryllium-aluminum powder as the powder feeding material, 3D printing the beryllium-aluminum powder into shape using a laser additive manufacturing process. The beryllium-aluminum alloy prepared by this invention exhibits a dense metallurgical structure, a hardness of 75-85 HV, and a tensile strength of 160-180 MPa, possessing high strength and toughness. The improved laser additive manufacturing process has advantages such as high material utilization, low production cost, and short manufacturing cycle, overcoming the shortcomings of the original laser additive manufacturing process.

Description

Technical Field

[0001] This invention relates to the field of beryllium-aluminum alloy preparation technology, and particularly to a method for laser additive manufacturing of beryllium-aluminum alloys and the resulting beryllium-aluminum alloys. Background Technology

[0002] Beryllium-aluminum alloys (typically containing approximately 30-70 wt% beryllium) combine the low density, high specific strength, and high specific stiffness of beryllium with the good machinability of aluminum, conserving beryllium resources. They can replace pure beryllium in many applications and represent a crucial research direction for overcoming the bottlenecks in the large-scale application of beryllium. Currently, they are mainly used in aerospace structural components, space satellite structural components, inertial navigation, and infrared optics.

[0003] Conventional methods for preparing beryllium aluminum alloys include investment casting and powder metallurgy. Investment casting is simple and low-cost, and can produce parts with relatively complex structures. However, the resulting beryllium aluminum alloy has large grains and is prone to defects such as shrinkage cavities, porosity, and segregation, which limits its engineering applications. Compared with casting, powder metallurgy has smaller grain sizes, better microstructure uniformity, and higher alloy strength. However, the powder metallurgy process is complex, quality control is difficult, and the blanks have large machining allowances.

[0004] Compared with traditional investment casting and powder metallurgy technologies, laser additive manufacturing of beryllium aluminum alloys uses high-power lasers to melt synchronously fed raw material alloy powders, layer by layer, to build up parts with dense structures and good properties. It has advantages such as no need for molds in the forming process, high material utilization, small amount of machining, low production cost, and short manufacturing cycle. It is suitable for forming high-performance, difficult-to-machine, and high-material-cost parts, especially for small-batch customized production of expensive and complex parts. It is at the forefront of international research and a competitive hotspot in the fields of new materials and advanced manufacturing, and has been successfully applied to the research and production of parts made of materials such as titanium alloys, aluminum alloys, and nickel-based alloys.

[0005] However, laser additive manufacturing of beryllium-aluminum alloy components presents the following technical challenges: (1) the density of the aluminum alloy matrix is ​​only 80-85%, making it difficult for beryllium and aluminum to be compatible; (2) the melting point of beryllium is 1287℃, while that of aluminum is 660℃. The large difference in melting points not only leads to a decrease in the effective melting rate of the laser and difficulty in heating, but also easily causes beryllium-aluminum delamination; (3) it easily causes the low-melting-point metal to evaporate, resulting in obvious defects in the alloy quality. To solve this problem, Chinese patent CN111906308A discloses a powder plasticizing additive manufacturing sintering forming method for beryllium-aluminum alloy aerospace components. This method prepares beryllium-aluminum components with a density of 98.5% through steps such as batching and mixing, printing and forming, vacuum hot dewaxing, sintering, hot pressing sintering, and de-agent removal, and claims to have solved the above-mentioned problems existing in laser additive manufacturing. However, this method not only makes the preparation process of beryllium aluminum alloy complex (including processes such as mixing, hot pressing and sintering), resulting in high manufacturing costs, but the strength level of beryllium aluminum alloy is an important indicator to test whether the technical defects of laser additive manufacturing have been overcome. However, this paper does not provide data on the strength performance of beryllium aluminum components, so it is difficult to know whether it has truly solved the technical problems of laser additive manufacturing process. Summary of the Invention

[0006] The purpose of this invention is to provide a method for laser additive manufacturing of beryllium-aluminum alloy and the resulting beryllium-aluminum alloy, thereby addressing the shortcomings of the prior art.

[0007] The technical solution adopted in this invention is as follows: A method for laser additive manufacturing of beryllium aluminum alloy, comprising the following steps:

[0008] A. Weigh out pure beryllium powder with a purity of not less than 97wt% and pure aluminum powder with a purity of not less than 99.5%, and mix them according to a beryllium-aluminum mass ratio of 60-65:35-40 (the beryllium content should not be too high or too low; if it is too high, there will be no cost advantage, and if it is too low, the performance of the beryllium-aluminum alloy will be difficult to meet the requirements), to obtain a uniformly mixed beryllium-aluminum powder (mixing can be carried out by a three-dimensional mixer, and the mixing time is 4-6 hours).

[0009] B. Using the aforementioned beryllium-aluminum mixed powder as the powder feeding material, the beryllium-aluminum mixed powder is 3D printed into shape using a laser additive manufacturing process to obtain the desired product. The parameters of the laser additive manufacturing process are set as follows: laser power of 800-1400W, laser scanning rate of 300-600mm / min, powder feeding rate of 2-5g / min, overlap rate of 60%, and Z-axis lift of 0.1-0.5mm. The entire 3D printing process is carried out under low humidity and low oxygen argon protection.

[0010] In this invention, the parameters of the laser additive manufacturing process mainly consider the laser absorption rate of beryllium aluminum alloy. Excessive laser power or scanning speed can easily lead to overheating, making it difficult for the component to continue to be deposited and formed. Conversely, if the laser power and scanning speed are too low, an effective molten pool cannot be formed. Experiments have shown that laser power and laser scanning speed are best suited within the aforementioned ranges. Furthermore, the powder feed rate is primarily matched to the molten pool size at the corresponding power. An excessive powder feed rate will result in significant powder waste, while an insufficient powder feed rate will prevent full utilization of laser energy. The lift is primarily matched to the molten pool depth to ensure stable deposition.

[0011] In this invention, a laser additive manufacturing method is used to deposit materials layer by layer. By controlling process parameters, defects in each layer are reduced. Combined with composition control, the probability of porosity caused by the volatilization of elements with lower saturated vapor pressure is reduced, thereby improving the internal defects of the beryllium-aluminum alloy and increasing its density. Furthermore, this invention utilizes additive manufacturing to form small molten pools for rapid solidification, which is beneficial for the rapid forming of beryllium-aluminum, a dual-phase alloy with a large melting point difference, in a short time. This reduces the likelihood of beryllium-aluminum delamination, facilitates the acquisition of fine microstructures, and improves the performance of the beryllium-aluminum alloy. Simultaneously, by controlling process parameters to regulate the residence time of the molten pool and by controlling the content of volatile elements (e.g., controlling the content of Mg), metallurgical quality is improved, and the volatilization of volatile elements is avoided.

[0012] Furthermore, by mass percentage, the composition of the raw material pure beryllium powder is: Al 0.35-0.45%, Fe 0.50-0.52%, Mg 0.05-0.1%, Mn 0.2-0.3%, Si 0.05-0.1%, O 1.0-1.5%, with the balance being Be. In this alloy composition, the Fe content must be controlled within the above range; otherwise, it will form a harmful phase, affecting performance improvement.

[0013] Furthermore, by mass percentage, the composition of the raw material pure aluminum powder is: Mg 0.03-0.04%, Si 0.005-0.01%, Fe 0.13-0.14%, Mn 0.005-0.01%, Cu 0.005-0.01%, O 0.10-0.23%, with the balance being Al. In this alloy composition, Mg has a low saturated vapor pressure and is prone to volatilization and pore formation during laser additive manufacturing, which is detrimental to performance improvement. Therefore, the Mg content needs to be controlled within the aforementioned range.

[0014] Preferably, the beryllium-aluminum mass ratio is 62:38.

[0015] Furthermore, the pure beryllium powder was sieved using a 200-mesh sieve, and the particle size range of the pure beryllium powder was 75-150μm, which conforms to a normal distribution.

[0016] Furthermore, the raw material, pure aluminum powder, is a spherical grayish-white powder with a particle size range of 75-100μm.

[0017] In this invention, synchronous powder feeding laser additive manufacturing has requirements for the range of powder particle size. Powder that is too fine cannot be fed, while powder that is too coarse requires higher energy and has poorer forming quality. Taking all factors into consideration, this invention selects a wider range of beryllium powder particle size, while selecting a narrower range for aluminum powder.

[0018] Furthermore, in step B, a laser additive manufacturing system is used for 3D printing, the laser additive manufacturing system comprising:

[0019] The additive manufacturing control system and glove box control system are used to control the operation of the entire system. The additive manufacturing control system and glove box control system are connected to the low humidity and low oxygen glove box through signal transmission lines.

[0020] The low-humidity, low-oxygen glove box includes a precision dual-axis CNC rotary table for additive manufacturing. An aluminum alloy substrate is placed on the table surface of the precision dual-axis CNC rotary table. The aluminum alloy substrate is used to support the beryllium aluminum alloy for additive manufacturing. The output end of the laser cladding head is directly above the aluminum alloy substrate. The laser cladding head is fixedly connected to the low-humidity, low-oxygen glove box via a robotic arm. The laser input end of the laser cladding head is connected to the laser device via an optical fiber. The powder input end of the laser cladding head is connected to a high-precision powder feeder via a powder feeding pipe.

[0021] When the laser additive manufacturing system is running, the protective gas is turned on first, then the high-precision powder feeder is turned on, and finally the laser equipment is turned on at the same time. By controlling the process parameters through the corresponding control system, the alloy can be formed according to the set forming path to obtain beryllium aluminum alloy.

[0022] Furthermore, the oxygen content in the low-humidity, low-oxygen glove box is less than 10 ppm.

[0023] Furthermore, the beryllium-aluminum mixed powder enters the low-humidity, low-oxygen glove box through the powder transition chamber, the aluminum alloy substrate enters the low-humidity, low-oxygen glove box through the small transition chamber, and the beryllium-aluminum alloy exits the low-humidity, low-oxygen glove box through the large transition chamber.

[0024] Furthermore, the laser additive manufacturing system ensures that contaminants are concentrated in the glove box during the printing process, and establishes a dedicated dust recovery system to recycle the generated beryllium-aluminum mixed powder.

[0025] Furthermore, the present invention also includes a beryllium-aluminum alloy, which is prepared by the above method.

[0026] Furthermore, the obtained beryllium-aluminum alloy has a thickness of more than 10 mm and a typical microstructure of beryllium-reinforced aluminum matrix composite material, exhibiting dense metallurgical microstructure characteristics without obvious defects such as pores and cracks. The microhardness of the beryllium-aluminum alloy is 75-85 HV, the tensile strength is 160-180 MPa, the yield strength is 115-135 MPa, the elongation is 8-10%, and the density is 99%.

[0027] In summary, due to the adoption of the above technical solutions, the beneficial effects of this invention are as follows: This invention uses a laser additive manufacturing method to deposit materials layer by layer, reducing defects in each layer through process parameter control. Combined with composition control, it reduces the probability of porosity caused by the volatilization of elements with lower saturated vapor pressure, thereby improving the internal defects of the beryllium-aluminum alloy and increasing its density. Simultaneously, this invention utilizes additive manufacturing to form small molten pools for rapid solidification, which is beneficial for the rapid forming of beryllium-aluminum, a dual-phase alloy with large melting point differences, in a short time, reducing the likelihood of beryllium-aluminum delamination. Furthermore, by controlling the residence time of the molten pool through process parameters, the volatilization of volatile elements is avoided, thus improving the performance of the beryllium-aluminum alloy. Attached Figure Description

[0028] Figure 1 This is a scanning electron microscope (SEM) image of pure beryllium powder from Example 1 of the present invention;

[0029] Figure 2 This is a scanning electron microscope (SEM) morphology image of pure aluminum powder from Embodiment 1 of the present invention;

[0030] Figure 3 This is a scanning electron microscope (SEM) morphology image of the beryllium-aluminum mixed powder of Embodiment 1 of the present invention;

[0031] Figure 4 Metallographic images of laser additive manufacturing beryllium aluminum alloy prepared for this invention;

[0032] Figure 5 This is a schematic diagram of the laser additive manufacturing equipment for beryllium aluminum alloy according to the present invention.

[0033] Explanation of reference numerals in the attached figures: 1 is the additive manufacturing control system, 2 is the glove box control system, 3 is the precision dual-axis CNC turntable, 4 is the small transition chamber, 5 is the powder recovery tray, 6 is the aluminum alloy substrate, 7 is the beryllium aluminum alloy, 8 is the large transition chamber, 9 is the multi-station operating glove, 10 is the laser cladding head, 11 is the optical fiber, 12 is the robotic arm, 13 is the high-precision powder feeder, 14 is the powder transition chamber, 15 is the laser equipment, 16 is the powder feeding pipe, and 17 is the low-humidity, low-oxygen glove box. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example 1

[0037] The preparation of beryllium aluminum alloy using laser additive manufacturing includes the following steps:

[0038] S1. Weigh out pure beryllium powder raw material. The composition of the pure beryllium powder raw material is: Al 0.36%, Fe 0.50%, Mg 0.05%, Mn 0.22%, Si 0.06%, O 1.1%, and the balance is Be. The pure beryllium powder raw material is sieved using a 200-mesh sieve. After sieving, most of the powder is in lumpy form, such as... Figure 1 As shown, the particle size of pure beryllium powder ranges from 75 to 150 μm;

[0039] S2. Weigh out pure aluminum powder raw material. The composition of the pure aluminum powder raw material is: Mg 0.03%, Si 0.006%, Fe 0.13%, Mn 0.006%, Cu 0.007%, O 0.15%, and the balance is Al; Figure 2 As shown, the raw material pure aluminum powder is a spherical grayish-white powder, and most of the aluminum powder particles are adhered to small planetary powders. The particle size of the pure aluminum powder ranges from 75 to 100 μm.

[0040] S3. In a low-humidity, low-oxygen glove box, weigh the raw materials, pure beryllium powder and pure aluminum powder, at a weight ratio of Be:Al of 62:38. After weighing, seal the powder in a mixing tank, then transfer the mixing tank to a three-dimensional mixer. The mixing time is 4 hours. The resulting beryllium-aluminum mixed powder is as follows: Figure 3 As shown, the mixture is relatively uniform;

[0041] S4. Experiments were conducted using a self-built laser additive manufacturing system. Beryllium aluminum alloy was prepared using laser additive manufacturing technology. The process parameters were: spot diameter of 2 mm, laser power of 1000 W, laser scanning rate of 300 mm / min, powder feed rate of 3 g / min, overlap rate of 60%, Z-axis lift of 0.25 mm, and interlayer cooling time of 0.5 min. The entire preparation process was carried out by protecting the high-temperature molten pool with argon gas (other inert gases can also be used). The forming path was controlled by CAD modeling, partitioning, filling, and output code to obtain beryllium aluminum alloy additive manufacturing samples. After the samples were transferred out, microstructure analysis and performance testing were performed.

[0042] Testing revealed that the beryllium-aluminum alloy exhibited no obvious defects such as porosity or cracks, and displayed a dense metallurgical structure. Figure 4As shown, the density is 99%. Tests revealed that the beryllium-aluminum alloy has a microhardness of 75HV, a tensile strength of 170MPa, a yield strength of 125MPa, and an elongation of 9%, exhibiting good strength and toughness.

[0043] Furthermore, the laser additive manufacturing system of this embodiment, as... Figure 5 As shown, it includes:

[0044] The additive manufacturing control system 1 and the glove box control system 2 are used to control the operation of the entire system. The additive manufacturing control system 1 and the glove box control system 2 are connected to the low humidity and low oxygen glove box 17 through a signal transmission line.

[0045] The low-humidity, low-oxygen glove box 17 includes a precision dual-axis CNC rotary table 3 for additive manufacturing. An aluminum alloy substrate 6 is placed on the table surface of the rotary table 3. The aluminum alloy substrate 6 supports the beryllium-aluminum alloy 7 used in additive manufacturing. A powder recovery tray 5 is located below the aluminum alloy substrate 6 to recover any remaining alloy powder. The output end of the laser cladding head 10 is directly above the aluminum alloy substrate 6. The laser cladding head 10 is fixedly connected to the low-humidity, low-oxygen glove box 17 via a robotic arm 12. The laser input end of the laser cladding head 10 is connected to a laser via an optical fiber 11. The equipment 15 is connected, and the powder input end of the laser cladding head 10 is connected to the high-precision powder feeder 13 through the powder feeding pipe 16. The high-precision powder feeder 13 is set inside the low-humidity and low-oxygen glove box 17. The low-humidity and low-oxygen glove box 17 is also equipped with a multi-station operating glove 9, a small transition chamber 4, a powder transition chamber 14, and a large transition chamber 8. The beryllium aluminum mixed powder enters the high-precision powder feeder 13 through the powder transition chamber 14, the aluminum alloy substrate 6 enters the low-humidity and low-oxygen glove box 17 through the small transition chamber 4, and the beryllium aluminum alloy is transferred out of the low-humidity and low-oxygen glove box 17 through the large transition chamber 8.

[0046] When the laser additive manufacturing system is running, the protective gas is first turned on to prevent contamination of the laser cladding head 10, then the high-precision powder feeder 13 is turned on, and finally the laser device 15 is turned on at the same time. By controlling the process parameters through the corresponding control system, the alloy can be formed according to the set forming path to obtain beryllium aluminum alloy 7.

[0047] Example 2

[0048] Example 2 is the same as Example 1, except that the process parameters of laser additive manufacturing in Example 2 are as follows: spot diameter is 2mm, laser power is 1100W, laser scanning rate is 320mm / min, powder feeding rate is 3g / min, overlap rate is 60%, Z-axis lift is 0.3mm, and interlayer cooling time is 0.5min.

[0049] Testing revealed that the beryllium-aluminum alloy prepared in Example 2 exhibited no obvious defects such as porosity or cracks, displaying a dense metallurgical structure with a density of 99%. The beryllium-aluminum alloy was tested to have a microhardness of 85 HV, a tensile strength of 180 MPa, a yield strength of 130 MPa, and an elongation of 8.8%, demonstrating good strength and toughness.

[0050] Example 3

[0051] Example 3 is the same as Example 1, except that the process parameters for laser additive manufacturing in Example 3 are as follows: spot diameter is 2mm, laser power is 900W, laser scanning rate is 300mm / min, powder feeding rate is 2.8g / min, overlap rate is 60%, Z-axis lift is 0.25mm, and interlayer cooling time is 0.5min.

[0052] Testing revealed that the beryllium-aluminum alloy prepared in Example 3 exhibited no obvious defects such as porosity or cracks, displaying a dense metallurgical structure with a density of 98%. The beryllium-aluminum alloy was tested to have a microhardness of 78 HV, a tensile strength of 168 MPa, a yield strength of 121 MPa, and an elongation of 9.2%, demonstrating good strength and toughness.

[0053] Example 4

[0054] Example 4 is the same as Example 1, except that the raw material pure beryllium powder has the following composition: Al 0.45%, Fe 0.50%, Mg 0.1%, Mn 0.3%, Si 0.05%, O 1.5%, with the balance being Be. The raw material pure aluminum powder has the following composition: Mg 0.04%, Si 0.01%, Fe 0.14%, Mn 0.01%, Cu 0.005%, O 0.10%, with the balance being Al.

[0055] Testing revealed that the beryllium-aluminum alloy prepared in Example 4 exhibited no obvious defects such as porosity or cracks, displaying a dense metallurgical structure with a density of 98%. The beryllium-aluminum alloy was tested to have a microhardness of 76 HV, a tensile strength of 165 MPa, a yield strength of 118 MPa, and an elongation of 8.8%, demonstrating good strength and toughness.

[0056] Example 5

[0057] Example 5 is the same as Example 1, except that the raw material pure beryllium powder has the following composition: Al 0.35%, Fe 0.52%, Mg 0.05%, Mn 0.3%, Si 0.1%, O 1.0%, with the balance being Be. The raw material pure aluminum powder has the following composition: Mg 0.03%, Si 0.005%, Fe 0.14%, Mn 0.005%, Cu 0.01%, O 0.23%, with the balance being Al.

[0058] Testing revealed that the beryllium-aluminum alloy prepared in Example 5 exhibited no obvious defects such as porosity or cracks, displaying a dense metallurgical structure with a density of 99%. The beryllium-aluminum alloy was tested to have a microhardness of 75 HV, a tensile strength of 160 MPa, a yield strength of 120 MPa, and an elongation of 8.9%, demonstrating good strength and toughness.

[0059] Comparative Example 1

[0060] Comparative Example 1 is the same as Example 1, except that the laser additive manufacturing process parameters of Comparative Example 1 are as follows: spot diameter is 2 mm, laser power is 1500 W, laser scanning rate is 300 mm / min, powder feeding rate is 3 g / min, overlap rate is 60%, Z-axis lift is 0.25 mm, and interlayer cooling time is 0.5 min.

[0061] Test results: Overheating occurred throughout the process, leading to difficulties in stacking and forming, poor forming effect, and failure to meet forming requirements.

[0062] Comparative Example 2

[0063] Comparative Example 2 is the same as Example 1, except that in Comparative Example 2, the Mg mass fraction in the pure aluminum powder is 0.1%.

[0064] Experimental results: The beryllium-aluminum alloy prepared in Comparative Example 2 was found to have significant porosity defects, with a density of 92%. The microhardness of the beryllium-aluminum alloy was 64 HV, tensile strength was 151 MPa, yield strength was 109 MPa, and elongation was 7.8%, indicating a significant decrease in both strength and toughness.

[0065] Comparative Example 3

[0066] Comparative Example 3 is the same as Example 1, except that in Comparative Example 3, the Fe mass fraction in the pure beryllium powder is 0.60%.

[0067] Experimental results: The beryllium-aluminum alloy prepared in Comparative Example 2 was found to have crack defects, with a density of 96%. The microhardness of the beryllium-aluminum alloy was 67 HV, tensile strength was 157 MPa, yield strength was 116 MPa, and elongation was 8.4%, indicating a significant decrease in both strength and toughness.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for laser additive manufacturing of beryllium aluminum alloy, characterized in that, Includes the following steps: A. Weigh out pure beryllium powder with a purity of not less than 97wt% and pure aluminum powder with a purity of not less than 99.5%, and mix them according to a beryllium-aluminum mass ratio of 60-65:35-40 to obtain a uniformly mixed beryllium-aluminum powder. B. Using the aforementioned beryllium-aluminum mixed powder as the powder feeding material, the beryllium-aluminum mixed powder is 3D printed into shape using a laser additive manufacturing process to obtain the desired product. The parameters of the laser additive manufacturing process are set as follows: laser power of 800-1400W, laser scanning rate of 300-600mm / min, powder feeding rate of 2-5g / min, overlap rate of 60%, and Z-axis lift of 0.1-0.5mm. The entire 3D printing process is carried out under low humidity and low oxygen argon protection, where low humidity and low oxygen refers to a water and oxygen content of less than 10ppm.

2. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 1, characterized in that, The pure beryllium powder, by mass percentage, comprises: Al 0.35-0.45%, Fe 0.50-0.52%, Mg 0.05-0.1%, Mn 0.2-0.3%, Si 0.05-0.1%, O 1.0-1.5%, with the balance being Be.

3. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 2, characterized in that, The pure aluminum powder composition, by mass percentage, is as follows: Mg 0.03-0.04%, Si 0.005-0.01%, Fe 0.13-0.14%, Mn 0.005-0.01%, Cu 0.005-0.01%, O 0.10-0.23%, with the balance being Al.

4. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 3, characterized in that, The beryllium-aluminum mass ratio is 62:

38.

5. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 4, characterized in that, The pure beryllium powder was sieved using a 200-mesh sieve, and the particle size range of the pure beryllium powder was 75-150μm, which conforms to a normal distribution.

6. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 5, characterized in that, The raw material, pure aluminum powder, is a spherical grayish-white powder with a particle size range of 75-100μm.

7. The method for laser additive manufacturing of beryllium aluminum alloy as described in any one of claims 1-6, characterized in that, In step B, a laser additive manufacturing system is used for 3D printing, the laser additive manufacturing system comprising: The additive manufacturing control system and glove box control system are used to control the operation of the entire system. The additive manufacturing control system and glove box control system are connected to the low humidity and low oxygen glove box through signal transmission lines. The low-humidity, low-oxygen glove box includes a precision dual-axis CNC rotary table for additive manufacturing. An aluminum alloy substrate is placed on the table surface of the precision dual-axis CNC rotary table. The aluminum alloy substrate is used to support the beryllium aluminum alloy for additive manufacturing. The output end of the laser cladding head is directly above the aluminum alloy substrate. The laser cladding head is fixedly connected to the low-humidity, low-oxygen glove box via a robotic arm. The laser input end of the laser cladding head is connected to the laser device via an optical fiber. The powder input end of the laser cladding head is connected to a high-precision powder feeder via a powder feeding pipe. When the laser additive manufacturing system is running, the protective gas is turned on first, then the high-precision powder feeder is turned on, and finally the laser equipment is turned on at the same time. By controlling the process parameters through the corresponding control system, the alloy can be formed according to the set forming path to obtain beryllium aluminum alloy.

8. The method for laser additive manufacturing of beryllium aluminum alloy as described in claim 7, characterized in that, The beryllium-aluminum mixed powder enters the low-humidity, low-oxygen glove box through the powder transition chamber, the aluminum alloy substrate enters the low-humidity, low-oxygen glove box through the small transition chamber, and the beryllium-aluminum alloy exits the low-humidity, low-oxygen glove box through the large transition chamber.

9. A beryllium-aluminum alloy, characterized in that, The beryllium-aluminum alloy is prepared by the method described in any one of claims 1-8. The beryllium-aluminum alloy has a microhardness of 75-85 HV, a tensile strength of 160-180 MPa, a yield strength of 115-135 MPa, and an elongation of 8-10%.

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