Eutectic high-entropy alloy preparation method using metal powder cored wire combined with electric arc additive and eutectic high-entropy alloy

Abstract

The invention provides a preparation method of a eutectic high-entropy alloy by using a metal powder cored wire combined with electric arc additive and the eutectic high-entropy alloy, and belongs to the technical field of alloy materials. The method comprises the following steps: taking the metal powder-cored wire as a raw material and an electric arc as a heat source; metal deposition is carried out on the substrate layer by layer through continuous wire feeding according to a preset path; an initial high-entropy alloy body is prepared after multilayer metal deposition; and the obtained initial high-entropy alloy body is subjected to heat treatment, and the eutectic high-entropy alloy is prepared. The eutectic high-entropy alloy with excellent mechanical performance can be obtained, the problem of poor alloy plasticity in a traditional method is solved, the problems of high energy consumption, long production period, complex manufacturing process and the like in existing alloy smelting and other technologies are avoided, and therefore the preparation method is simpler, lower in energy consumption and better in economical efficiency and efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of alloy materials, and more specifically, relates to a method for preparing a eutectic high entropy alloy using a metal powder cored welding wire combined with arc additive and a eutectic high entropy alloy. Background Art

[0002] Existing high-entropy alloy manufacturing methods (such as vacuum melting or plasma arc deposition) have problems such as high energy consumption, long production cycle and complex manufacturing. The processing and preparation of high-hardness high-entropy alloys places extremely high demands on the uniformity of wire composition and manufacturing process. However, traditional methods are difficult to achieve these requirements economically and efficiently.

[0003] Integrating wire arc additive manufacturing (WAAM) with high entropy alloys (HEAs) offers many advantages, especially the cost-effective production of large-scale alloy bodies. However, the successful realization of HEAs in wire arc additive processes requires specific wire compositions, which undoubtedly brings many challenges. Although softer HEAs such as Canrtor (a high entropy alloy composed of five elements Co, Cr, Fe, Mn, and Ni in equiatomic ratios or near equiatomic ratios) can be manufactured using solid wire or multiple component wires, solid wires for manufacturing high-hardness HEAs with specific composition requirements have become infeasible, and addressing the complexity of this technology is the current difficulty faced by this field of technology. Summary of the invention

[0004] The purpose of the present invention is to address the above shortcomings and provide a method for preparing a eutectic high entropy alloy using a metal powder cored welding wire combined with arc additive manufacturing and a eutectic high entropy alloy. By using a metal powder cored welding wire with a specific composition and combining it with optimized arc additive manufacturing technology, problems existing in the prior art such as alloy smelting are avoided, and a high entropy alloy with excellent mechanical properties can be obtained. The method is simple, has low energy consumption, and is economical and efficient.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing a eutectic high entropy alloy by using a metal powder cored welding wire combined with arc addition, the preparation method comprising:

[0007] Using the metal powder core welding wire as raw material and using electric arc as heat source;

[0008] Depositing metal layer by layer on the substrate by continuous wire feeding according to a preset path;

[0009] After multiple layers of metal deposition, an initial high entropy alloy body is obtained;

[0010] The obtained initial high entropy alloy body is heat treated to obtain the eutectic high entropy alloy.

[0011] Furthermore, the metal deposition parameters include: current of 280A~350A, arc voltage of 32V~34V, deposition temperature of 200℃~250℃, and wire feeding speed of 77mm / s~90mm / s. The combination of the above process parameters solves the problem of poor plasticity of high entropy alloys prepared in traditional methods. The higher current range combined with the moderate arc voltage ensures an efficient material deposition rate while maintaining a stable arc; secondly, controlling the deposition temperature helps to reduce the heat affected zone and improve the mechanical properties of the initial high entropy alloy body; furthermore, the optimized wire feeding speed combined with the above parameters not only improves production efficiency, but also ensures the stability of the deposition process and reduces the occurrence of defects such as pores and cracks. Overall, the precise control of these parameters enables the manufactured alloy body to have both high quality and high productivity.

[0012] Furthermore, the heat treatment process of the present invention is performed according to a specific temperature control program. First, the sample is heated to a set high-temperature treatment temperature in air, preferably at 1000°C~1150°C; then it is kept at this temperature for 1~1.5 hours to complete the necessary internal structural changes; finally, it is quickly quenched in water and the treatment process is ended by rapid cooling, thereby optimizing material properties. The water temperature can be set to 15°C~25°C.

[0013] Furthermore, the substrate is made of high-strength low-alloy steel, and its size is adjusted according to actual needs.

[0014] Further, the metal powder cored welding wire comprises an ultra-low carbon steel strip outer shell and a metal powder mixture wrapped therein;

[0015] The carbon content of the ultra-low carbon steel strip shell is <0.05 wt%;

[0016] The metal powder mixture includes cobalt powder, nickel powder, aluminum powder and tantalum powder, and the mass ratio of the cobalt powder, nickel powder, aluminum powder and tantalum powder is (15-17): (16-18): (7.5-8.8): (1.05-1.35), and the preferred mass ratio is 16:17:8:1.2.

[0017] Adding different types of metal powders can significantly affect the properties of eutectic high-entropy alloys, such as hardness, mechanical strength and corrosion resistance.

[0018] Furthermore, the outer diameter of the metal powder core welding wire may be between 0.8 mm and 3 mm, preferably between 2 mm and 2.5 mm.

[0019] Furthermore, the metal powder cored welding wire has a filling factor of 50% to 70%, which can balance the efficiency and operating performance requirements of preparing high-hardness eutectic high-entropy alloys. The filling factor of a metal powder cored welding wire refers to the volume percentage of the metal powder (i.e., the core component) in the welding wire. For example, when the filling factor is determined to be 60%, it means that 60% of the space inside the welding wire is occupied by metal powder, and the remaining 40% is composed of the outer wrapping material (ultra-low carbon steel strip).

[0020] The filling factor is an important parameter when designing and manufacturing welding wire, because it directly affects the deposition efficiency, arc stability and the quality of the high entropy alloy formed during use. A higher filling factor means that the welding wire contains more effective metal material (i.e., metal powder) per unit length, which can generally improve preparation efficiency and reduce the amount of welding wire used. However, too high a filling factor may increase the rigidity of the welding wire, affect its wire feeding performance, and may have a negative impact on the welding process, such as causing arc instability. Therefore, the selection of an appropriate filling factor requires comprehensive consideration of many factors, including but not limited to cost-benefit analysis and expected high entropy alloy performance.

[0021] Furthermore, the particle size of the metal powder is 0.5 micrometers to 20 micrometers.

[0022] Furthermore, the method for preparing the metal powder cored welding wire comprises:

[0023] Mixing cobalt powder, nickel powder, aluminum powder and tantalum powder in a preset ratio to obtain a metal powder mixture;

[0024] The ultra-low carbon steel strip is pre-bent and rolled using a roll-forming process;

[0025] The obtained metal powder mixture is coated on the inner surface of the ultra-low carbon steel strip after the rolling process by using a powder filter;

[0026] Using an encapsulating roller to encapsulate the ultra-low carbon steel strip coated with the metal powder mixture to form an integral material consisting of an ultra-low carbon steel strip shell and the metal powder mixture encapsulated therein;

[0027] During the encapsulation and tightening stage, the overall material is made into a linear shape by wire drawing to obtain a metal powder core welding wire.

[0028] Furthermore, the size of the ultra-low carbon steel strip is (0.2~0.5) mm×(10~15) mm.

[0029] Furthermore, the rolling rate of the encapsulating roller is 0.5 m / min to 2 m / min, and the wire drawing rate is 0.8 mm / s to 2.2 mm / s.

[0030] In a second aspect, the present invention provides a eutectic high entropy alloy prepared by the preparation method described in the first aspect.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The preparation method of the eutectic high entropy alloy described in the present invention adopts metal powder cored welding wire, combined with optimized arc additive manufacturing technology and specific heat treatment methods, to achieve efficient and precise manufacturing of complex structural parts. Its evenly distributed alloy powder improves the filling efficiency and weld quality, and enhances the mechanical properties; arc additive manufacturing provides high deposition rate and material utilization, while heat treatment can greatly improve hardness and strength, and optimize component performance. This combination is particularly suitable for applications requiring high strength and high toughness, avoiding problems existing in existing technologies such as alloy smelting, and can obtain high entropy alloys with excellent mechanical properties. The method is simple, energy-saving, and economical and efficient.

[0033] The preparation method of the eutectic high entropy alloy of the present invention adopts an arc heat source to perform metal deposition, ensures operation under appropriate current and voltage conditions, so as to achieve efficient material melting and deposition; controls the temperature conditions during deposition of each layer, ensures that the previous deposition layer can be fully heated, promotes the uniformity of the microstructure and the interlayer bonding strength; adjusts the wire feeding speed according to the deposition rate, and forms a product with specific size specifications through multiple layers of continuous deposition; implements a precisely controlled heat treatment process, heats and maintains for a certain time to ensure that the material completes the necessary phase change process, and water quenching can refine the grains, reduce residual stress, and enhance the hardness and wear resistance of the eutectic high entropy alloy material;

[0034] The metal powder core welding wire used in the present invention combines the advantages of the ultra-low carbon steel strip outer shell Fe and the internal Co, Ni, Al and Ta alloy powders. First, cobalt and nickel enhance the toughness and corrosion resistance of the material, aluminum acts as a deoxidizer to reduce oxide inclusions, and tantalum refines the grains, which together improve the mechanical properties of the material; secondly, the ultra-low carbon steel strip reduces the risk of hydrogen-induced cracking and is suitable for application scenarios with high toughness and corrosion resistance requirements; finally, the evenly distributed alloy powder improves the utilization rate of the filling material, which not only ensures the high-quality alloy body but also improves the preparation efficiency;

[0035] The preparation method of the metal powder core welding wire of the present invention has the advantages of structural optimization and high packaging quality. The ultra-low carbon steel strip is first pre-bent and rolled, and then the metal powder mixture is coated on its inner surface. This method not only ensures that the metal powder can be evenly distributed, but also improves the density and structural integrity of the final product; the ultra-low carbon steel strip coated with the metal powder mixture is encapsulated by an encapsulating roller, so that the outer shell and the internal metal powder are tightly combined to form an integral material, which ensures the shedding and displacement of the metal powder in the welding wire. In the wire drawing stage, the overall material shape is made into a linear shape by wire drawing. This process has high flexibility and can adjust the wire diameter as needed. Due to the above preparation method, the obtained metal powder core welding wire has good cladding performance, including but not limited to excellent arc stability, low spatter rate and excellent mechanical properties. The preparation method is suitable for various types of metal powder combinations, not only can be used for alloy systems containing cobalt, nickel, aluminum, and tantalum, but also can adjust the formula according to actual needs, expanding its application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a process schematic diagram of a method for preparing a metal powder cored welding wire according to an embodiment of the present invention;

[0037] Figure 2 The energy spectrometer spectrum of the cross section of the metal powder core welding wire prepared in Example 1 of the present invention;

[0038] Figure 3 This is an X-ray image of the eutectic high entropy alloy prepared in Example 1 of the present invention;

[0039] Figure 4 The X-ray diffraction pattern of the eutectic high entropy alloy prepared in Example 1 of the present invention;

[0040] Figure 5 This is a SEM image of the eutectic high entropy alloy prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0041] Arc additive manufacturing is an important part of modern industry and allows the efficient production of complex metal products. However, in order to achieve high hardness and mechanical strength of the produced alloys, a special approach to the composition of the materials is required. High entropy alloys consist of five or more components and have unique properties such as high hardness, wear resistance and mechanical strength at high temperatures. It is well known that the four-component Fe-Co-Ni-Al alloy has a shape memory effect and high thermal stability. It is produced by induction melting in an argon atmosphere. The disadvantages of this method are that induction melting requires a large current, the residence time of the metal at high temperature, and the energy consumption of the entire process; another example is the CoCrFeNiTa0.4 alloy produced by plasma arc deposition. Another problem is the difficulty in preparing the powder mixture before surface treatment. It is also known to prepare multi-component alloys of the CoCrFeNiTa alloy system by vacuum melting in a protective atmosphere. The disadvantage of this method is the long duration of the smelting process and the high economic cost of small batch production. The use of fine powders (50 μm) of pure metals Fe, Co, Ni, and Cr in equimolar ratios to create a surface layer on an aluminum substrate and subsequent laser remelting of the surface layer made it possible to obtain a high-entropy alloy surface layer with higher hardness, but there are limitations on the thickness of the layer formed and significant energy consumption when using the laser.

[0042] The present invention overcomes the above disadvantages by developing metal powder welding wire compositions and optimizing arc additive manufacturing conditions. The present invention creates a metal powder welding wire composition for producing a specific high entropy alloy using arc welding additive manufacturing. The proposed method can obtain a high entropy alloy bulk billet with excellent mechanical properties, which can be widely used in industrial fields including aviation, mechanical manufacturing and energy industries.

[0043] The present invention provides a method for preparing a eutectic high entropy alloy by using a metal powder cored welding wire in combination with an electric arc to add material. The preparation method uses a metal powder cored welding wire as a raw material, uses an electric arc as a heat source, and deposits metal layer by layer on a substrate by continuous wire feeding according to a preset path.

[0044] First, a program for controlling the motion path is generated based on the computer-aided design model;

[0045] Next, a metal powder cored welding wire is fed into the arc region to be melted and deposited on the substrate along a predetermined path to form a first layer;

[0046] After each layer is completed, the table or print head moves to prepare for the deposition of the next layer;

[0047] This process is repeated until the desired structure is completed. During this process, the arc current, voltage, wire feeding speed and movement path are strictly controlled to ensure the forming accuracy and quality.

[0048] The preferred embodiments of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific examples.

[0049] Example 1

[0050] This embodiment provides a eutectic high entropy alloy prepared by using a metal powder cored welding wire combined with an arc additive manufacturing method, wherein the preparation method comprises the following steps:

[0051] (1) Preparation of metal powder core welding wire

[0052] 15 g of cobalt powder, 16 g of nickel powder, 7.5 g of aluminum powder and 1.05 g of tantalum powder are mixed to prepare a metal powder mixture; the particle size of the metal powder is 5 μm to 20 μm;

[0053] like Figure 1 As shown:

[0054] The ultra-low carbon steel strip of 0.5 mm×12 mm is placed in a forming roller for pre-bending and rolling; the carbon content of the outer shell of the ultra-low carbon steel strip is less than 0.05 wt%;

[0055] Using a powder filter to coat the metal powder mixture on the inner surface of the ultra-low carbon steel strip after the rolling process;

[0056] The ultra-low carbon steel strip coated with the metal powder mixture is encapsulated by an encapsulating roller, the rolling speed of the encapsulating roller being 0.5 m / min, to form an integral material consisting of an ultra-low carbon steel strip shell and the metal powder mixture encapsulated therein;

[0057] During the encapsulation and tightening stage, the overall material is drawn into a linear shape at a rate of 2.2 mm / s until the diameter is reduced to 2 mm to obtain the desired metal powder core welding wire; the filling factor of the metal powder core welding wire is 50%.

[0058] Energy dispersive spectroscopy was used to obtain the cross section of the metal powder core welding wire prepared in this embodiment, and its spectrum is as follows: Figure 2 In the subsequent arc additive step, the wire is placed in the inner and outer zones of the arc's molten pool, allowing for eventual mixing.

[0059] (2) Preparation of eutectic high entropy alloy

[0060] The above metal powder core welding wire is used as raw material, an arc is used as a heat source, the arc current is 280A, and the voltage is 32V;

[0061] Metal deposition is performed layer by layer on a 50 mm wide and 14 mm thick high-strength low-alloy steel substrate by continuous wire feeding according to a preset path;

[0062] The deposition temperature of each layer was controlled at 200°C to ensure that the previously deposited layer was fully heated;

[0063] The wire feeding speed was controlled to 77 mm / s, and an initial high-entropy alloy body of 150 mm × 35 mm × 20 mm was obtained after ten layers of metal deposition;

[0064] The obtained initial high entropy alloy body was heat treated according to the following temperature control program: first, the sample was heated to 1000° C. in air, then kept at this temperature for 1 hour, and finally, quickly quenched in water at 15° C. to obtain the eutectic high entropy alloy.

[0065] The eutectic high entropy alloy sample prepared in this example was subjected to energy dispersive spectroscopy (EDS) analysis, and the obtained X-ray image was as follows: Figure 3 As shown in the figure, it can be seen that for the Fe-Co-Ni-Al-Ta alloying system composition, the use of metal powder cored welding wire combined with arc additive manufacturing can determine the formation of a uniform Fe-Co-Ni-Al solid solution, in which the Ta-rich Laves phase is eutectic. Therefore, the solid solution is determined by the uniform X-ray image obtained by energy spectrum analysis.

[0066] In order to observe the solid solution more accurately, the X-ray acquisition method was used to analyze and study the crystal structure and composition of the sample. Figure 4 The X-ray diffraction patterns are shown and the chemical composition of the eutectic high entropy alloy samples is shown in Table 1. Figure 4 (a) is the X-ray diffraction pattern of the initial high entropy alloy body obtained by arc additive, (b) is the X-ray diffraction pattern of the initial high entropy alloy body obtained by arc additive after heat treatment, (c) and (d) are enlarged images.

[0067] Table 1: Chemical composition of eutectic high entropy alloy samples

[0068] .

[0069] according to Figure 4 The comprehensive analysis of Table 1 shows that the samples manufactured by arc additive manufacturing are mainly composed of face-centered cubic solid solution, especially the presence of Laves phase, indicating the existence of multiple crystal structures in the samples.

[0070] The microstructure of the eutectic high entropy alloy prepared in this example was analyzed using a scanning electron microscope (SEM). The preparation of the metallographic specimen for microstructure inspection followed standard procedures. The analysis results are shown in Figure 2. Figure 5 As shown in the figure, it can be seen that the Laves phases present in the material matrix play a key role in improving its mechanical properties, especially helping to increase the hardening mechanism and thermal stability. These phases appear as layered morphologies with complex and multifaceted features, mainly located at the boundaries adjacent to the dendritic arms in the microstructure.

[0071] Example 2

[0072] This embodiment provides a eutectic high entropy alloy prepared by using a metal powder cored welding wire combined with an arc additive manufacturing method, wherein the preparation method comprises the following steps:

[0073] (1) Preparation of metal powder core welding wire

[0074] 16 g of cobalt powder, 17 g of nickel powder, 8 g of aluminum powder and 1.15 g of tantalum powder are mixed to prepare a metal powder mixture; the particle size of the metal powder is 5 μm to 20 μm;

[0075] The ultra-low carbon steel strip of 0.2 mm×10 mm is placed in a forming roller for pre-bending and rolling; the carbon content of the outer shell of the ultra-low carbon steel strip is less than 0.05 wt%;

[0076] Using a powder filter to coat the metal powder mixture on the inner surface of the ultra-low carbon steel strip after the rolling process;

[0077] The ultra-low carbon steel strip coated with the metal powder mixture is encapsulated by an encapsulating roller, the rolling speed of the encapsulating roller being 1 m / min, to form an integral material consisting of an ultra-low carbon steel strip shell and the metal powder mixture encapsulated therein;

[0078] During the encapsulation and tightening stage, the overall material is drawn into a linear shape at a rate of 0.8 mm / s until the diameter is reduced to 2.2 mm to obtain the desired metal powder core welding wire; the filling factor of the metal powder core welding wire is 60%.

[0079] (2) Preparation of eutectic high entropy alloy

[0080] The above metal powder core welding wire is used as raw material, an arc is used as a heat source, the arc current is 300A, and the voltage is 33V;

[0081] Metal deposition is performed layer by layer on a 50 mm wide and 14 mm thick high-strength low-alloy steel substrate by continuous wire feeding according to a preset path;

[0082] The deposition temperature of each layer was controlled at 230°C to ensure that the previously deposited layer was fully heated;

[0083] The wire feeding speed was controlled to be 80 mm / s, and an initial high-entropy alloy body of 150 mm × 35 mm × 20 mm was obtained after ten layers of metal deposition;

[0084] The obtained initial high entropy alloy body was heat treated according to the following temperature control program: first, the sample was heated to 1050° C. in air, then kept at this temperature for 1.2 hours, and finally, quickly quenched in water at 20° C. to obtain the eutectic high entropy alloy.

[0085] Example 3

[0086] This embodiment provides a eutectic high entropy alloy prepared by using a metal powder cored welding wire combined with an arc additive manufacturing method, wherein the preparation method comprises the following steps:

[0087] (1) Preparation of metal powder core welding wire

[0088] 17 g of cobalt powder, 18 g of nickel powder, 8.8 g of aluminum powder and 1.35 g of tantalum powder are mixed to prepare a metal powder mixture; the particle size of the metal powder is 5 μm to 20 μm;

[0089] The ultra-low carbon steel strip of 0.5 mm×15 mm is placed in a forming roller for pre-bending and rolling; the carbon content of the outer shell of the ultra-low carbon steel strip is less than 0.05 wt%;

[0090] Using a powder filter to coat the metal powder mixture on the inner surface of the ultra-low carbon steel strip after the rolling process;

[0091] The ultra-low carbon steel strip coated with the metal powder mixture is encapsulated by an encapsulating roller, the rolling speed of the encapsulating roller being 2 m / min, to form an integral material consisting of an ultra-low carbon steel strip shell and the metal powder mixture encapsulated therein;

[0092] During the encapsulation and tightening stage, the overall material is drawn into a linear shape at a rate of 2.5 mm / s until the diameter is reduced to 3 mm to obtain the desired metal powder core welding wire; the filling factor of the metal powder core welding wire is 70%.

[0093] (2) Preparation of eutectic high entropy alloy

[0094] The above metal powder core welding wire is used as raw material, an arc is used as a heat source, the arc current is 350A, and the voltage is 34V;

[0095] Metal deposition is performed layer by layer on a 50 mm wide and 14 mm thick high-strength low-alloy steel substrate by continuous wire feeding according to a preset path;

[0096] The deposition temperature of each layer was controlled at 250°C to ensure that the previously deposited layer was fully heated;

[0097] The wire feeding speed was controlled to be 90 mm / s, and an initial high-entropy alloy body of 150 mm × 35 mm × 20 mm was obtained after ten layers of metal deposition;

[0098] The obtained initial high entropy alloy body was heat treated according to the following temperature control program: first, the sample was heated to 1150° C. in air, then kept at this temperature for 1.5 hours, and finally, quickly quenched in water at 25° C. to obtain the eutectic high entropy alloy.

[0099] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and technical principles of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art, and these modifications and changes should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a eutectic high entropy alloy by using a metal powder cored welding wire combined with arc addition, characterized in that: The preparation method comprises: Using the metal powder core welding wire as raw material and an electric arc as a heat source; Depositing metal layer by layer on the substrate by continuous wire feeding according to a preset path; After multiple layers of metal deposition, an initial high entropy alloy body is obtained; The obtained initial high entropy alloy body is heat treated to obtain the eutectic high entropy alloy.

2. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc material addition according to claim 1, characterized in that: The parameters of the metal deposition include: current of 280 A to 350 A, arc voltage of 32 V to 34 V, deposition temperature of 200° C. to 250° C., and wire feeding speed of 77 mm / s to 90 mm / s.

3. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc material addition according to claim 1, characterized in that: The heat treatment process includes: heating to 1000°C-1150°C, then keeping the temperature for 1 hour-1.5 hours, and then quenching in water with a water temperature of 15°C-25°C.

4. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc material addition according to claim 1, characterized in that: The metal powder core welding wire comprises an ultra-low carbon steel strip shell and a metal powder mixture wrapped therein; The carbon content of the ultra-low carbon steel strip shell is less than 0.05 wt%; The metal powder mixture includes cobalt powder, nickel powder, aluminum powder and tantalum powder, and the mass ratio of the cobalt powder, nickel powder, aluminum powder and tantalum powder is (15-17): (16-18): (7.5-8.8): (1.05-1.35).

5. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc addition according to claim 4, characterized in that: The outer diameter of the metal powder core welding wire is 2 mm to 2.5 mm; And / or, the filling factor of the metal powder core welding wire is 50%~70%.

6. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc material addition according to claim 4, characterized in that: The particle size of the metal powder is 0.5 micrometer to 20 micrometers.

7. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc addition according to claim 4, characterized in that: The preparation method of the metal powder cored welding wire comprises: Mixing cobalt powder, nickel powder, aluminum powder and tantalum powder in a predetermined ratio to obtain a metal powder mixture; Pre-bending and rolling the ultra-low carbon steel strip; coating the obtained metal powder mixture on the inner surface of the ultra-low carbon steel strip after the rolling process; Using an encapsulating roller to encapsulate the ultra-low carbon steel strip coated with the metal powder mixture to form an integral material consisting of an ultra-low carbon steel strip shell and the metal powder mixture encapsulated therein; During the encapsulation and tightening stage, the overall material shape is made into a wire shape by wire drawing to obtain a metal powder core welding wire.

8. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc material addition according to claim 7, characterized in that: The size of the ultra-low carbon steel strip is (0.2~0.5) mm×(10~15) mm.

9. The method for preparing eutectic high entropy alloy by using metal powder cored welding wire combined with arc addition according to claim 7, characterized in that: The rolling rate of the encapsulating roller is 0.5 m / min to 2 m / min, and the wire drawing rate is 0.8 mm / s to 2.2 mm / s.

10. A eutectic high entropy alloy, characterized in that: The eutectic high entropy alloy is prepared by the preparation method according to any one of claims 1 to 9.

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