Method for preparing high-performance beryllium-aluminum composite material by adopting high-frequency pulsed arc additive manufacturing

Abstract

The invention discloses a method for preparing a high-performance beryllium-aluminum composite material by adopting high-frequency pulsed arc additive manufacturing, and relates to an additive manufacturing method of a beryllium-aluminum composite material. The invention aims to solve the problem that the mechanical property of the prepared beryllium-aluminum composite material is poor due to the fact that the length-diameter ratio of beryllium dendrites in the beryllium-aluminum composite material prepared in the electric arc additive manufacturing process is extremely high. According to the method, an alternating magnetic field is generated in a molten pool through high-frequency pulse current, periodic Lorentz force is formed to drive strong convection of a melt, shearing force is applied to growing dendritic crystals, so that dendritic crystal arms are broken, the length-diameter ratio of the pre-solidified beryllium dendritic crystals is greatly reduced, a molten aluminum infiltration channel is shortened, the shrinkage porosity defect is greatly reduced, and the service life of the molten aluminum is prolonged. The mechanical property is improved. The fractured dendritic crystal fragments form a high-surface-energy interface in the melt, the nucleation energy barrier is reduced, a preferential attachment point is provided for melt atoms, a heterogeneous nucleation core is provided, then grain refinement is achieved, and the mechanical property of the beryllium-aluminum composite material is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for additive manufacturing of beryllium aluminum composite material. BACKGROUND

[0002] Beryllium aluminum composite material has become a strategic and key material indispensable to new generation of electronic information, national defense and military industry, aerospace and other cutting-edge fields due to its excellent lightweight, high stiffness, high thermal stability and excellent specific strength and specific stiffness.

[0003] The current mainstream preparation technology of beryllium aluminum composite material mainly adopts casting method and powder metallurgy method, both of which need to rely on complex mold and are difficult to realize near-net forming of components, especially for complex thin-walled structure, the subsequent processing is highly dependent on a large number of subtractive manufacturing processes, resulting in extremely low material utilization rate, causing serious waste of extremely valuable beryllium resources, and further increasing the cost. The electric arc additive manufacturing process is considered as a very promising solution, which can realize near-net forming without complex mold, can significantly improve the material utilization rate and shorten the delivery cycle, and provides a new path for solving the problem of efficient utilization of beryllium resources and reducing cost.

[0004] However, in the electric arc additive manufacturing process of beryllium aluminum composite material, super-long beryllium dendrites with a length of more than 500 microns and an aspect ratio of more than 100:1 are easily formed, which is due to the extremely high temperature gradient and low solidification rate in the bottom region of the molten pool, which strongly promotes the epitaxial growth of columnar crystals; combined with the fact that the solidification temperature interval of beryllium aluminum composite material is as wide as about 600°C, the existence time of the mushy zone is significantly prolonged. Especially in the case of high beryllium volume fraction, under the combined action of the above factors, these generated super-long beryllium dendrites interweave to form an abnormal dense and rigid three-dimensional network skeleton. The channel between the dendrites becomes extremely narrow and narrow, which produces great resistance to the flow of aluminum liquid, seriously hindering the effective infiltration and feeding of the aluminum liquid to the gap of the beryllium dendrite network. Finally, a large number of solidification defects such as shrinkage holes and porosity are produced in the deposited material, resulting in a decrease in the density of the material and a serious damage to the performance of the component, which becomes the core bottleneck restricting the development of electric arc additive manufacturing technology of high-performance low-porosity beryllium aluminum composite material. Therefore, a method for electric arc additive manufacturing of high-performance beryllium aluminum composite material is urgently needed. SUMMARY

[0005] In order to solve the problem of high aspect ratio of beryllium dendrites in the preparation of beryllium aluminum composite material in the electric arc additive manufacturing process, which makes it difficult for the aluminum liquid to effectively infiltrate and feed into the gap of the beryllium dendrite network, and further leads to poor mechanical properties of the prepared beryllium aluminum composite material, a method for preparing high-performance beryllium aluminum composite material by high-frequency pulse electric arc additive manufacturing is proposed.

[0006] The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse electric arc additive manufacturing is carried out according to the following steps:

[0007] I. Select beryllium aluminum composite wire, and carry out surface oxide layer treatment and cleaning;

[0008] The beryllium aluminum composite wire is composed of an aluminum matrix and a beryllium particle reinforcing body;

[0009] The volume fraction of the beryllium particle reinforcing body in the beryllium aluminum composite wire is 50%-80%;

[0010] II. Clean the substrate before deposition, and then preheat the substrate;

[0011] The method for cleaning the substrate is: first, remove the oxides and oil stains on the surface of the substrate, and then clean the surface of the substrate with anhydrous ethanol or acetone;

[0012] III. In an inert gas atmosphere, a beryllium aluminum composite material is prepared by layer-by-layer deposition using arc additive manufacturing, and after each layer deposition is completed, the obtained beryllium aluminum composite material is cooled to 80-150 before the next layer deposition;

[0013] The process parameters of the arc additive manufacturing are: a high-frequency pulse waveform power source is selected, the pulse frequency of the high-frequency pulse waveform power source is 1kHz-20kHz, the current is 150-200A, the voltage is 14-20V, and the duty cycle is 10-100%; the dry elongation is 10-15mm, the wire feeding speed is 2-8m / min, and the welding gun moving speed is 0.2-0.8m / min.

[0014] The present application has the following beneficial effects:

[0015] 1. The present application generates an alternating magnetic field in the molten pool by high-frequency pulse current, forms a periodic Lorentz force to drive the melt strong convection, applies shear force to the growing dendrite to make the dendrite arm break, greatly reduces the aspect ratio of the primary solidified beryllium dendrite, shortens the aluminum liquid infiltration channel, greatly reduces the shrinkage defect, and improves the mechanical properties. The broken dendrite fragments form a high surface energy interface in the melt, reduce the nucleation energy barrier, provide preferential attachment points for melt atoms, provide heterogeneous nucleation cores, and further refine the grains, further improving the mechanical properties of the beryllium aluminum composite material.

[0016] 2. The high-frequency pulse of the present application enhances the effects of electromagnetic stirring, Marangoni flow, etc. through the periodic disturbance of thermal-electric-power multi-physical field, significantly improves the fluidity of the melt and the efficiency of heat and mass transfer, enhances the wetting and penetration of the aluminum liquid to the dendrite gap, further reduces the defects of the arc additive manufacturing beryllium aluminum composite material, and improves the mechanical properties of the beryllium aluminum composite material.

[0017] 3、The pulse thermal oscillation in the application interrupts the columnar crystal epitaxial growth advantage, and the dendrite fracture fragments act as heterogeneous nucleation cores; under the driving of the melt pool convection, the fragments rotate and redistribute and trigger multi-orientation nucleation, which promotes random growth of equiaxed grains, and the above reasons synergistically weaken the crystallographic preferred orientation, thereby realizing isotropic strengthening of the material. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A scanning microstructure diagram of a beryllium aluminum composite material prepared without high-frequency pulse for the comparative example;

[0019] Figure 2 A scanning microstructure diagram of a beryllium aluminum composite material prepared by applying high-frequency pulse for the embodiment 1. DETAILED DESCRIPTION

[0020] The technical scheme of the application is not limited to the following specific embodiments, and any reasonable combination of the specific embodiments is also included.

[0021] Specific embodiment one: the method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing is performed according to the following steps:

[0022] I. Select a beryllium aluminum composite material welding wire, and perform surface oxide layer removal treatment and cleaning;

[0023] The beryllium aluminum composite material welding wire is composed of an aluminum matrix and a beryllium particle reinforcement;

[0024] The volume fraction of the beryllium particle reinforcement in the beryllium aluminum composite material welding wire is 50%-80%;

[0025] II. Clean the substrate before deposition, and then preheat the substrate;

[0026] The method for cleaning the substrate is: first, remove the oxides and oil stains on the surface of the substrate, and then clean the surface of the substrate with anhydrous ethanol or acetone;

[0027] III. Layer-by-layer deposition of beryllium aluminum composite material is prepared by arc additive manufacturing in an inert gas atmosphere, and after each layer deposition is completed, the obtained beryllium aluminum composite material is cooled to 80-150 before the next layer deposition;

[0028] The process parameters of the arc additive manufacturing are: a high-frequency pulse waveform power source is selected, the pulse frequency of the high-frequency pulse waveform power source is 1 kHz-20 kHz, the current is 150-200 A, the voltage is 14-20 V, and the duty cycle is 10-100%; the dry elongation is 10-15 mm, the wire feeding speed is 2-8 m / min, and the welding gun moving speed is 0.2-0.8 m / min.

[0029] 1. This embodiment uses high-frequency pulsed current to generate an alternating magnetic field in the molten pool, creating a periodic Lorentz force that drives strong convection in the melt. This exerts shear force on growing dendrites, causing them to break. This significantly reduces the aspect ratio of the first-solidified beryllium dendrites, shortens the aluminum infiltration channel, significantly reduces shrinkage defects, and improves mechanical properties. The broken dendrite fragments form high-surface energy interfaces in the melt, lowering the nucleation barrier and providing preferential attachment points for melt atoms, creating heterogeneous nucleation cores. This leads to grain refinement and further improves the mechanical properties of the beryllium aluminum composite.

[0030] 2. In this embodiment, the high-frequency pulses enhance the effects of electromagnetic stirring, Marangoni flow, etc. through the periodic disturbance of the thermal-electrical-mechanical multi-physical fields, significantly improve the melt fluidity and heat and mass transfer efficiency, enhance the wetting and penetration of the aluminum liquid into the dendrite gaps, further reduce the defects of the arc additively manufactured beryllium aluminum composite material, and improve the mechanical properties of the beryllium aluminum composite material.

[0031] 3. In this embodiment, pulsed thermal oscillation interrupts the epitaxial growth advantage of columnar crystals, and at the same time, the broken fragments of dendrites serve as heterogeneous nucleation cores; driven by the convection of the molten pool, the fragments rotate and redistribute and trigger multi-oriented nucleation, promoting the random growth of equiaxed grains. The synergistic effect of the above reasons significantly weakens the crystallographic preferred orientation and achieves isotropic strengthening of the material.

[0032] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the volume fraction of beryllium particle reinforcement in the beryllium aluminum composite material welding wire in step 1 is 70%.

[0033] Specific embodiment three: This embodiment differs from specific embodiment one or two in that: in step one, the volume fraction of the beryllium particle reinforcement in the beryllium aluminum composite material welding wire is 60%.

[0034] Specific embodiment 4: This embodiment differs from any one of specific embodiments 1 to 3 in that: the cleaning in step 1 uses anhydrous ethanol.

[0035] Specific embodiment 5: This embodiment differs from any one of specific embodiments 1 to 4 in that: in step 1, the particle size of the beryllium particle reinforcement in the beryllium aluminum composite material welding wire is 10 μm-800 μm.

[0036] Specific embodiment six: The difference between this embodiment and any one of specific embodiments one to five is that the composition of the aluminum matrix in step one is: Mg is 0.01-0.05wt%, Si is 0.01-0.25%, Fe is 0.01-0.4%, Mn is 0.01-0.02%, Cu is 0.01-0.04%, O is 0.05-0.5%, and the balance is Al.

[0037] Specific embodiment seven: This embodiment differs from any one of specific embodiments one to six in that: the diameter of the beryllium aluminum composite material welding wire in step one is 1-1.6 mm.

[0038] Specific embodiment eight: This embodiment differs from any one of specific embodiments one to seven in that: the temperature of the substrate preheating in step two is 50-200°C.

[0039] Specific embodiment 9: This embodiment differs from any one of specific embodiments 1 to 8 in that: the inert gas atmosphere in step 3 is argon, or a mixed gas of argon and helium.

[0040] Specific embodiment ten: This embodiment differs from any one of specific embodiments one to nine in that the gas flow rate of the inert gas in step three is 10-20 L / min.

[0041] Example 1

[0042] The method for preparing high-performance beryllium aluminum composite materials using high-frequency pulse arc additive manufacturing in this embodiment is carried out in the following steps:

[0043] 1. Select beryllium aluminum composite material welding wire and perform surface oxidation layer removal and cleaning;

[0044] The beryllium aluminum composite material welding wire is composed of an aluminum matrix and a beryllium particle reinforcement;

[0045] The volume fraction of beryllium particle reinforcement in the beryllium aluminum composite welding wire is 50%;

[0046] The cleaning adopts anhydrous ethanol;

[0047] The particle size of the beryllium particle reinforcement in the beryllium aluminum composite material welding wire is 40 μm-100 μm;

[0048] The composition of the aluminum matrix is: 0.02% Mg, 0.1% Si, 0.3% Fe, 0.01% Mn, 0.02% Cu, 0.4% O, and the balance is Al;

[0049] The diameter of the beryllium aluminum composite material welding wire is 1.6 mm;

[0050] 2. Clean the substrate before deposition and then preheat the substrate;

[0051] The method for cleaning the substrate is as follows: first, removing oxides and oil stains on the surface of the substrate, and then cleaning the surface of the substrate with anhydrous ethanol;

[0052] The substrate is preheated at a temperature of 100° C.

[0053] III. The beryllium-aluminum composite material is prepared by layer-by-layer deposition using arc additive manufacturing in an inert gas atmosphere, and after each layer deposition is completed, the obtained beryllium-aluminum composite material is cooled to 100 before the next layer deposition is performed;

[0054] The process parameters of the arc additive manufacturing are as follows: a high-frequency pulse waveform power source is selected, the pulse frequency of the high-frequency pulse waveform power source is 10 kHz, the current is 180 A, the voltage is 16 V, and the duty cycle is 40%; the dry elongation is 12 mm, the wire feeding speed is 6 m / min, and the welding gun moving speed is 0.6 m / min;

[0055] The inert gas atmosphere uses argon, and the gas flow rate of the inert gas is 15 L / min.

[0056] The preparation method of the beryllium-aluminum composite material wire is as follows:

[0057] Step (1): Preparation of beryllium / aluminum composite material

[0058] The beryllium / aluminum composite material is prepared by using a self-exhausting pressure infiltration method:

[0059] ①, After the beryllium particle reinforcement and the aluminum matrix are uniformly mixed, they are loaded into a steel mold to press into a preform, and the pressing pressure is 100 kN, and the holding time is 2 min; then the steel mold loaded with the preform is placed in a preheating furnace and preheated at 510℃ for 2h;

[0060] ②, The aluminum matrix is melted at a temperature of 850℃ to obtain liquid aluminum, and then the liquid aluminum is poured into the steel mold preheated in step ①;

[0061] ③, The pressure head applies a pressure of 20 MPa and moves downward at a speed of 5 mm / min, and holds at a pressure of 30 MPa for 3 min, and then cools by circulating water to obtain the beryllium / aluminum composite material;

[0062] Step (2): Preheating of beryllium / aluminum composite material and hot extrusion die

[0063] First, the beryllium / aluminum composite material is preheated to a temperature of 500℃, and then held at a temperature of 500℃ for 1h; the hot extrusion die is held at a temperature of 50℃ lower than the preheating temperature of the beryllium / aluminum composite material for 1h;

[0064] Step (3): Hot extrusion to prepare beryllium / aluminum composite material rods

[0065] The preheated beryllium / aluminum composite material is loaded into the hot extrusion die, and hot extrusion is performed using a press machine, and the hot extrusion rate is 60 mm / min, and a plurality of beryllium / aluminum composite material rods are obtained at one time;

[0066] The extrusion die is a multi-hole extrusion die, the hole diameter is 5 mm, and the number of holes is 4; the diameter of the preheated beryllium / aluminum composite material is 36 mm;

[0067] Step (4): annealing treatment of the beryllium / aluminum composite rod

[0068] The beryllium / aluminum composite rod obtained in step (3) is heated to 400 DEG C, and then kept at a temperature of 400 DEG C for 2 h;

[0069] Step (5): hot rotary swaging to prepare a beryllium / aluminum composite filament

[0070] The beryllium / aluminum composite rod is subjected to multi-pass rotary swaging using a rotary swaging machine; the multi-pass rotary swaging process is as follows: the rotary swaging temperature is 300 DEG C, the deformation amount of each pass is 10%, the feeding rate is 100 mm / min, the rotary swaging frequency is 50 Hz, and annealing treatment is performed after each pass of rotary swaging, the annealing temperature is the same as the rotary swaging temperature, and the annealing time is 20 min.

[0071] Comparative example: the difference between the comparative example and the example is that a conventional alternating current power supply is used. The other processes are the same as those in example 1.

[0072] Figure 1 The scanning microstructure of the beryllium / aluminum composite material prepared without applying high-frequency pulse in the comparative example is shown in the figure; Figure 2 The scanning microstructure of the beryllium / aluminum composite material prepared by applying high-frequency pulse in example 1 is shown in the figure. By comparing the microstructure, it can be found that the microstructure of the beryllium / aluminum composite material prepared in example 1 is changed from long columnar dendrites to short dendrites, and the microstructure is obviously refined. Through detection, the porosity of the beryllium / aluminum composite material prepared in example 1 is 0.5%, the tensile strength is 510 MPa, the yield strength is 442 MPa, and the elongation is 4.6%. Compared with the beryllium / aluminum composite material of the same composition prepared by the additive manufacturing process without applying high-frequency pulse (comparative example), the porosity is reduced to one fourth of that of the comparative example, the tensile strength is increased by 34%, the yield strength is increased by 51%, and the elongation is increased by 170%, which greatly improves the mechanical properties of the beryllium / aluminum composite material.

[0073] Example 2

[0074] The method for preparing high-performance beryllium / aluminum composite material by high-frequency pulse arc additive manufacturing in this example is carried out according to the following steps:

[0075] I. Select beryllium / aluminum composite wire, and perform surface oxidation layer removal treatment and cleaning;

[0076] The beryllium / aluminum composite wire is composed of an aluminum matrix and a beryllium particle reinforcement;

[0077] The volume fraction of the beryllium particle reinforcement in the beryllium / aluminum composite wire is 60%.

[0078] The cleaning uses anhydrous ethanol;

[0079] The particle size of the beryllium particle reinforcement in the beryllium aluminum composite wire is 80-200 microns;

[0080] The composition of the aluminum matrix is: Mg 0.01%, Si 0.1%, Fe 0.2%, Mn 0.01%, Cu 0.04%, O 0.5%, and the balance is Al;

[0081] The diameter of the beryllium aluminum composite wire is 1.6 mm;

[0082] II. Clean the substrate before deposition, and then preheat the substrate;

[0083] The method for cleaning the substrate is: first remove the oxide and oil stains on the surface of the substrate, and then clean the surface of the substrate with anhydrous ethanol;

[0084] The temperature of the substrate preheating in step two is 100°C;

[0085] III. In an inert gas atmosphere, use arc additive manufacturing to deposit layer by layer to prepare beryllium aluminum composite material, after each layer deposition is completed, the obtained beryllium aluminum composite material is cooled to 100, and then the next layer deposition is carried out;

[0086] The process parameters of the arc additive manufacturing are: selecting a high-frequency pulse waveform power supply, the pulse frequency of the high-frequency pulse waveform power supply is 15 kHz, the current is 170 A, the voltage is 17 V, and the duty cycle is 40%; the dry elongation is 12 mm, the wire feeding speed is 6 m / min, and the welding gun moving speed is 0.6 m / min;

[0087] The inert gas atmosphere uses argon, and the gas flow rate of the inert gas is 15 L / min.

[0088] After applying high-frequency pulse, the organization is transformed from long columnar dendrite to short dendrite, and the organization is obviously refined. Through detection, the beryllium aluminum composite material prepared by the high-frequency pulse arc additive process has a porosity of 0.7%, a tensile strength of 532 MPa, a yield strength of 461 MPa, and an elongation of 4%. Compared with the same composition beryllium aluminum composite material prepared by the arc additive process without high-frequency pulse (comparative example), the porosity is reduced to one fourth, the tensile strength is increased by 42%, the yield strength is increased by 47%, and the elongation is increased by 130%, which greatly improves the mechanical properties of the beryllium aluminum composite material.

[0089] Example 3

[0090] The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing in this embodiment is carried out according to the following steps:

[0091] I. Select beryllium aluminum composite wire, and perform surface oxidation layer removal treatment and cleaning;

[0092] The beryllium aluminum composite wire is composed of an aluminum matrix and a beryllium particle reinforcement;

[0093] The volume fraction of the beryllium particle reinforcement in the beryllium aluminum composite wire is 70%;

[0094] The cleaning uses anhydrous ethanol;

[0095] The particle size of the beryllium particle reinforcement in the beryllium aluminum composite wire is 100-300 μm;

[0096] The composition of the aluminum matrix is: Mg 0.02%, Si 0.2%, Fe 0.2%, Mn 0.02%, Cu 0.01%, O 0.3%, and the balance being Al;

[0097] The diameter of the beryllium aluminum composite wire is 1.2 mm;

[0098] II. Clean the substrate before deposition, and then preheat the substrate;

[0099] The method for cleaning the substrate is: first remove the oxides and oil stains on the surface of the substrate, and then clean the surface of the substrate with anhydrous ethanol;

[0100] The preheating temperature of the substrate in step II is 120°C;

[0101] III. Use arc additive manufacturing to prepare beryllium aluminum composite material layer by layer in an inert gas atmosphere, and after each layer deposition is completed, the obtained beryllium aluminum composite material is cooled to 120°C before the next layer deposition;

[0102] The process parameters of the arc additive manufacturing are: a high-frequency pulse waveform power source is selected, the pulse frequency of the high-frequency pulse waveform power source is 20 kHz, the current is 190 A, the voltage is 18 V, and the duty cycle is 50%; the dry elongation is 10 mm, the wire feeding speed is 8 m / min, and the welding gun moving speed is 0.8 m / min;

[0103] The inert gas atmosphere uses argon, and the gas flow rate of the inert gas is 12 L / min.

[0104] After applying high-frequency pulse, the microstructure of the beryllium-aluminum composite material prepared by the arc additive manufacturing process is transformed from long columnar dendrites into short dendrites, and the microstructure is obviously refined. It is detected that the porosity of the beryllium-aluminum composite material prepared by the arc additive manufacturing process with high-frequency pulse is 0.8%, the tensile strength is 550 MPa, the yield strength is 505 MPa, and the elongation is 3.2%. Compared with the beryllium-aluminum composite material of the same composition prepared by the arc additive manufacturing process without high-frequency pulse (comparative example), the porosity is reduced to nearly one fifth, the tensile strength is increased by 52%, the yield strength is increased by 41%, and the elongation is increased by 150%, which greatly improves the mechanical properties of the beryllium-aluminum composite material.

Claims

1. A method for preparing high-performance beryllium aluminum composite materials using high-frequency pulse arc additive manufacturing, characterized in that: The method for preparing high-performance beryllium aluminum composite materials using high-frequency pulsed arc additive manufacturing is carried out in the following steps:

1. Select beryllium aluminum composite material welding wire and perform surface oxidation layer removal and cleaning; The beryllium aluminum composite material welding wire is composed of an aluminum matrix and a beryllium particle reinforcement; The volume fraction of beryllium particle reinforcement in the beryllium aluminum composite welding wire is 50%-80%; 2. Clean the substrate before deposition and then preheat the substrate; The method for cleaning the substrate is as follows: first, removing oxides and oil stains on the surface of the substrate, and then cleaning the surface of the substrate with anhydrous ethanol or acetone; 3. Prepare the beryllium aluminum composite material by layer-by-layer deposition using arc additive manufacturing in an inert gas atmosphere. After each layer of deposition is completed, wait for the obtained beryllium aluminum composite material to cool to 80-150 degrees before depositing the next layer; The process parameters of the arc additive manufacturing are as follows: a high-frequency pulse waveform power supply is selected, the pulse frequency of the high-frequency pulse waveform power supply is 1kHz-20kHz, the current is 150-200A, the voltage is 14-20V, and the duty cycle is 10-100%; the dry extension is 10-15mm, the wire feeding speed is 2-8m / min, and the welding gun movement speed is 0.2-0.8m / min.

2. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The volume fraction of beryllium particle reinforcement in the beryllium aluminum composite material welding wire described in step 1 is 70%.

3. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The volume fraction of beryllium particle reinforcement in the beryllium aluminum composite material welding wire described in step 1 is 60%.

4. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The cleaning in step 1 is performed using anhydrous ethanol.

5. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The particle size of the beryllium particle reinforcement in the beryllium aluminum composite material welding wire in step 1 is 10μm-800μm.

6. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The composition of the aluminum matrix in step 1 is: Mg is 0.01-0.05wt%, Si is 0.01-0.25%, Fe is 0.01-0.4%, Mn is 0.01-0.02%, Cu is 0.01-0.04%, O is 0.05-0.5%, and the balance is Al.

7. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The diameter of the beryllium aluminum composite material welding wire in step 1 is 1-1.6 mm.

8. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The substrate is preheated at a temperature of 50-200°C in step 2.

9. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: In step 3, the inert gas atmosphere is argon or a mixture of argon and helium.

10. The method for preparing high-performance beryllium aluminum composite material by high-frequency pulse arc additive manufacturing according to claim 1, characterized in that: The gas flow rate of the inert gas in step 3 is 10-20 L / min.

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