High-specific-energy-absorption eutectic high-entropy alloy curved surface lattice structure additive manufacturing method

Abstract

The invention provides a high-specific-energy-absorption eutectic high-entropy alloy curved surface lattice structure additive manufacturing method which comprises the following steps: preparing a eutectic high-entropy alloy powder material, adding the eutectic high-entropy alloy powder material into a laser powder bed melting printer, and filling inert gas into the printer as shielding gas; designing a sheet-shaped TPMS lattice structure, exporting the sheet-shaped TPMS lattice structure as a slice file, and then importing the slice file into a laser powder bed melting printer; starting to print a TPMS lattice structure; and after printing is completed, the TPMS lattice structure is cut off from the substrate through linear cutting, and then the eutectic high-entropy alloy curved surface lattice structure is obtained. According to the eutectic high-entropy alloy sheet-shaped TPMS lattice structure obtained through laser powder bed melting forming, the eutectic high-entropy alloy material is applied to an energy absorption scene of the lattice structure for the first time, the energy absorption advantages of the material, the structure and the technology are combined, and compared with a traditional stainless steel lattice structure, the specific energy absorption is improved by about 50%.

Description

Technical Field

[0001] The present invention relates to the technical field of metal additive manufacturing (3D printing), and particularly relates to a method for obtaining a high specific energy absorption curved lattice structure by combining the advantages of materials, structures, and processes in three aspects. Background Art

[0002] High-entropy alloys are a new type of alloy containing 5 or more main element components. In 2014, Lu Yiping and others first proposed the concept of eutectic high-entropy alloys and successfully cast the AlCoCrFeNi2.1 eutectic high-entropy alloy. The eutectic structure of this alloy consists of mutually stacked ordered and high-strength BCC phases and ordered and high-toughness FCC phases, showing an unprecedented combination of high tensile plasticity and high fracture strength at room temperature, and exhibiting extraordinary strain hardening ability, making it advantageous in energy absorption application scenarios.

[0003] The sheet-like triply periodic minimal surface (TPMS) lattice structure is one of the porous structures. TPMS is a periodic implicit surface with zero mean curvature. Compared with other structures, the surface of the TPMS structure is very smooth without sharp edges or connection points like other lattice structures. Therefore, there are no stress concentration areas in the TPMS lattice structure, and it also has more advantages in energy absorption performance than other lattice structures.

[0004] Additive manufacturing technology can be defined as a process of using a three-dimensional model to connect materials layer by layer to form complex structures. This technology enables us to create countless possibilities in a freely designed form. Scientists have used various matrix materials such as polymers, metals, ceramics, and composite materials to prepare a large number of new energy-absorbing materials and structures with complex topological structures through additive manufacturing technology. Among them, the laser powder bed fusion (LPBF) technology has the advantages of high resolution and minimum layer thickness, making it an ideal technology for manufacturing metal lattices. In addition, compared with other additive manufacturing technologies, the LPBF technology has the highest temperature gradient and cooling rate during the manufacturing process, which makes the manufactured parts have refined microstructures and fine lamellar spacing, and the mechanical properties are greatly improved. Currently, in the field of additive manufacturing, the materials applied to the energy absorption scenario of lattice structures are mainly stainless steel. Due to the limited yield strength and plasticity of stainless steel materials, it is difficult to achieve high energy absorption during their deformation process, and it is difficult to meet the increasingly stringent application environments of additive manufacturing parts. Summary of the Invention

[0005] In view of the above problems, the present invention provides a method for additive manufacturing of a high specific energy absorption eutectic high-entropy alloy curved lattice structure, which can improve the ability of the lattice structure to absorb energy per unit mass (specific energy absorption), and is beneficial for the energy absorption structure to be lightweight while having excellent energy absorption performance.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An additive manufacturing method for a curved lattice structure of a high specific energy absorption eutectic high-entropy alloy, comprising the following steps:

[0008] Prepare eutectic high-entropy alloy powder materials and add them to a laser powder bed fusion printer, and fill an inert gas into the printer as a protective gas; design a sheet-like TPMS lattice structure, export it as a sliced file, and then import it into the laser powder bed fusion printer; start printing the TPMS lattice structure; after printing is completed, use wire cutting to cut the TPMS lattice structure from the substrate to obtain the eutectic high-entropy alloy curved lattice structure.

[0009] Further, the eutectic high-entropy alloy powder is AlCoCrFeNi2.1 high-entropy alloy powder.

[0010] Further, the preparation method of the high-entropy alloy is a powder metallurgy method.

[0011] Further, the powder particle size of the high-entropy alloy is 15 - 53 μm.

[0012] Further, the mass fraction composition of the high-entropy alloy is: Al 8% - 9%, Co 17% - 19%, Cr 15% - 17%, Fe 16 - 18%, Ni 39% - 41%.

[0013] Further, the sheet-like TPMS lattice structure is a Gyriod lattice structure, and the lattice structure is designed by the C level set method. The mathematical surface description formula of the Gyriod lattice structure is:

[0014] ΦG = sinXcosY + sinYcosZ + sinZcosX = ±C

[0015] Where X = 2πx, Y = 2πy, Z = 2πz, x, y, z are spatial coordinates, C is a constant, and the relationship between C and the relative density ρ of the lattice structure is ρ = 0.65C.

[0016] Further, the size of the sheet-like TPMS lattice structure is 30mm × 30mm × 30mm, the unit cell size is 6mm × 6mm × 6mm, and the relative density is 30% or 35% or 40% or 45%.

[0017] Further, during the laser powder bed fusion preparation process, the laser power is 200W, the scanning speed is 600mm / s, the scanning spacing is 100μm, and the powder layer thickness is 40μm.

[0018] A eutectic high-entropy alloy curved lattice structure, and the eutectic high-entropy alloy curved lattice structure is prepared by the above method.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] By the above method, the present invention has the following advantages for the laminated TPMS lattice structure prepared from eutectic high-entropy alloy powder by laser powder bed fusion technology:

[0021] (1) Due to its unique FCC / BCC dual-phase nanosheet structure, dislocation strengthening mechanism and solid solution strengthening mechanism, the eutectic high-entropy alloy curved lattice structure of the present invention endows the substrate with the characteristics of balanced high yield strength and high ductility, and its specific energy absorption performance per unit mass is increased by about 50% compared with the stainless steel lattice structure in the literature.

[0022] (2) The laminated TPMS lattice structure of the eutectic high-entropy alloy obtained by laser powder bed fusion forming in the present invention can be applied to passive energy absorption devices in various fields to protect human safety and machine components, such as in the aerospace field, like space landers; in the automotive field, like energy absorption boxes; in the military field, like ejection seats, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flowchart of the implementation of the present invention.

[0024] Figure 2 In [the figure], a) is a surface graph generated by the mathematical description formula of the Gyroid three-period minimal surface; b) is a single-cell graph of the lattice structure obtained by thickening the surface.

[0025] Figure 3 In [the figure], a) are three-dimensional model diagrams of TPMS lattice structures with relative densities of 30%, 35%, 40% and 45% designed respectively, corresponding to the numbers G30, G35, G40 and G45; b) are physical diagrams of the corresponding TPMS lattice structures printed by the laser powder bed fusion process.

[0026] Figure 4 Are force-displacement curve graphs obtained after quasi-static compression of TPMS lattice structures with relative densities of 30%, 35%, 40% and 45% respectively.

[0027] Figure 5 Is a performance comparison graph of the specific energy absorption (SEA) per unit mass of the G30, G35, G40 and G45 eutectic high-entropy alloy laminated TPMS lattice structures and the lattice structures in the literature. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The above content of the present invention will be further described in detail below in the form of embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments. All technologies implemented based on the above content of the present invention belong to the scope of the present invention.

[0029] The experimental methods used in the following embodiments are all conventional methods unless otherwise specified. The reagents, methods, and equipment used are all conventional reagents, methods, and equipment in the technical field unless otherwise specified.

[0030] Combined with Figure 1 , the present invention provides a method for additive manufacturing of a high specific energy absorption eutectic high-entropy alloy curved lattice structure, including the following steps:

[0031] Use MSLattice software to design a lattice structure with a Gyroid unit cell type, a unit cell size of 6 mm × 6 mm × 6 mm, and a cell number of 5 × 5 × 5, and design the relative density of the lattice structure to be 30%, 35%, 40%, or 45% respectively; place and slice the model file, and then import the sliced file into a laser powder bed fusion printer; fill argon gas into the printer as a protective gas; add eutectic high-entropy alloy powder into the printer. Among them, the high-entropy alloy is AlCoCrFeNi2.1; the mass fraction composition of the high-entropy alloy is: Al 8% - 9%, Co 17% - 19%, Cr 15% - 17%, Fe 16% - 18%, Ni 39% - 41%; the printer prints out the eutectic high-entropy alloy TPMS lattice structure, where the laser power in the printer parameters is 200 W, the scanning speed is 600 mm / s, the scanning spacing is 100 μm, and the powder bed thickness is 40 μm; the lattice structure is a Gyriod lattice structure, and the lattice structure is designed by the C-level set method. The mathematical surface description formula of the Gyriod lattice structure is:

[0032] ΦG = sinXcosY + sinYcosZ + sinZcosX = ±C

[0033] where X = 2πx, Y = 2πy, Z = 2πz, x, y, z are spatial coordinates, C is a constant, and the relationship between C and the relative density ρ of the lattice structure is ρ = 0.65C.

[0034] The following further describes the present invention in detail with specific embodiments:

[0035] Example 1

[0036] The present invention provides a method for additive manufacturing of a high specific energy absorption eutectic high-entropy alloy curved lattice structure, and a high specific energy absorption eutectic high-entropy alloy TPMS lattice structure is obtained. The steps are as follows:

[0037] Step 1: Design a TPMS lattice structure with a relative density of 30%, named G30. Import the sliced file into a laser powder bed fusion printer, which specifically includes the following steps:

[0038] S1: The TPMS lattice structure design software is MSLattice. The overall size of the lattice structure is 30mm×30mm×30mm, the unit cell size is 6mm×6mm×6mm, and the lattice type is Gyroid.

[0039] S2: The software for placing and slicing the part is Materialise Magics.

[0040] Step 2: Laser powder bed fusion forming of a eutectic high-entropy alloy TPMS lattice structure. The material is AlCoCrFeNi2.1 eutectic high-entropy alloy powder, which specifically includes the following steps:

[0041] S1: The equipment used for laser powder bed fusion printing is a Concept Laser M2 device. Set the laser power to 200W, the scanning speed to 600mm / s, the scanning spacing to 100μm, the powder layer thickness to 40μm, and the scanning strategy is to rotate 90° between layers.

[0042] S2: Add the eutectic high-entropy alloy powder into the laser powder bed fusion printer, fill in the inert gas argon as the protective gas, and then print the lattice structure.

[0043] S3: After printing, clean the powder, remove the component from the substrate by wire cutting, and perform ultrasonic vibration under alcohol conditions to clean the surface of the part, obtaining a eutectic high-entropy alloy TPMS lattice structure entity. After preliminary observation, no macroscopic cracking phenomenon occurred in the printed entity, and the forming effect was good.

[0044] Use a compression testing machine to conduct a quasi-static compression test on the lattice structure. Obtain the force-displacement curve and calculate the specific energy absorption, which specifically includes the following steps:

[0045] S1: The compression testing machine used is a Sansi integrated compression and flexure testing machine, model UTM7305, with a maximum test force of 300kN. The quasi-static compression rate is 0.1mm / s.

[0046] S2: The formula for calculating the specific energy absorption is: (F is the force, δ is the displacement, m is the mass).

[0047] The present invention also protects the eutectic high-entropy alloy TPMS lattice structure manufactured by the above manufacturing process.

[0048] The Gyroid triply periodic minimal surface is as Figure 2As shown in a) of [reference], the Gyroid surface is thickened to obtain a Gyroid lattice unit cell as Figure 2 shown in b) of [reference]. The three-dimensional model and printed physical part of the TPMS lattice structure are as Figure 3 shown in a) and b) of [reference]. The force-displacement curve obtained from quasi-static compression is as Figure 4 shown. It can be seen that the G30 lattice structure has a long and gentle energy absorption platform, which is attributed to the strong-ductility balance characteristics brought by the unique FCC / BCC eutectic structure of the eutectic high-entropy alloy and the structural characteristics of the TPMS plane with zero mean curvature. At the same time, it is also attributed to the grain refinement and reduced lamellar spacing brought by the rapid cooling-solidification process of the laser powder bed fusion process, thereby improving the mechanical properties of the lattice structure.

[0049] In the present invention, a high specific energy absorption high-entropy alloy curved lattice structure is obtained by combining the advantages of materials, structures, and processes, as Figure 5 shown is the comparison chart of the specific energy absorption of the present invention and stainless steel lattice in the literature. According to the national standard GB / T 31930-2015 "Test Method for Ductility of Metallic Materials Compression Test of Porous and Cellular Metals", a quasi-static compression experiment was carried out on this embodiment, and the data was processed to obtain the specific energy absorption of the G30 embodiment as 25 J / g. Under the condition of similar relative density, the specific energy absorption is about 47% higher than the research result of ALMAHRI S et al. (Additive Manufacturing, 2021, 46:102220) (i.e., Figure 5 SS316L[1] in [reference]). It is about 127% higher than the research result of NOVAK N et al. (Composite Structures, 2021, 266:113801) (i.e., Figure 5 316L[2] in [reference]).

[0050] Example 2

[0051] The present invention provides a method for additive manufacturing of a high specific energy absorption eutectic high-entropy alloy curved lattice structure, and a high specific energy absorption eutectic high-entropy alloy TPMS lattice structure is obtained. The steps are as follows:

[0052] Step 1, design a TPMS lattice structure with a relative density of 35% and name it G35. Import the sliced file into a laser powder bed fusion printer, which specifically includes the following steps:

[0053] S1. The TPMS lattice structure design software is MSLattice. The overall size of the lattice structure is 30 mm × 30 mm × 30 mm, the unit cell size is 6 mm × 6 mm × 6 mm, and the lattice type is Gyroid.

[0054] S2. The software for placing and slicing the parts is Materialise Magics.

[0055] Step 2: Laser powder bed fusion forming of the eutectic high-entropy alloy TPMS lattice structure. The material is AlCoCrFeNi2.1 eutectic high-entropy alloy powder, and the specific steps are as follows:

[0056] S1. The equipment used for laser powder bed fusion printing is the Concept Laser M2 equipment. Set the laser power to 200W, the scanning speed to 600mm / s, the scanning spacing to 100μm, the powder layer thickness to 40μm, and the scanning strategy to rotate 90° between layers.

[0057] S2. Add the eutectic high-entropy alloy powder into the laser powder bed fusion printer, fill in the inert gas argon as the protective gas, and then print the lattice structure.

[0058] S3. After printing, clean the powder, remove the component from the substrate by wire cutting, and perform ultrasonic vibration under alcohol conditions to clean the surface of the part, obtaining the eutectic high-entropy alloy TPMS lattice structure entity. After observation, no macroscopic cracking phenomenon occurred in the printed entity, and the forming effect was good.

[0059] Use a compression testing machine to conduct a quasi-static compression test on the lattice structure. Obtain the force-displacement curve and calculate the specific energy absorption index.

[0060] S1. The compression testing machine used is the Sansi integrated compression and flexure testing machine, model UTM7305, with a maximum test force of 300kN. The quasi-static compression rate is 0.1mm / s.

[0061] S2. The formula for specific energy absorption is: (F is the force, δ is the displacement, m is the mass).

[0062] The present invention also protects the eutectic high-entropy alloy TPMS lattice structure manufactured parts obtained by the above manufacturing process.

[0063] Conduct a quasi-static compression experiment on this embodiment, and process the data to obtain the specific energy absorption of the G35 embodiment as 27.5J / g. Under the condition of similar relative density, the specific energy absorption is increased by about 45% compared with the research results of ALMAHRI S et al. (Additive Manufacturing, 2021, 46:102220) (i.e., Figure 5 SS316L[1] in Figure 5 Compared with the research results of LI X et al. (Additive Manufacturing, 2021, 46:102054) (i.e.,

[0064] Example 3

[0065] The present invention provides a method for additive manufacturing of a high specific energy absorption eutectic high-entropy alloy curved lattice structure, and a high specific energy absorption eutectic high-entropy alloy TPMS lattice structure is obtained. The steps are as follows:

[0066] Step 1: Design a TPMS lattice structure with a relative density of 40%, and name it G40. Import the sliced file into a laser powder bed fusion printer, which specifically includes the following steps:

[0067] S1: The TPMS lattice structure design software is MSLattice. The overall size of the lattice structure is 30mm×30mm×30mm, the unit cell size is 6mm×6mm×6mm, and the lattice type is Gyroid.

[0068] S2: The software for placing and slicing the part is Materialise Magics.

[0069] Step 2: Laser powder bed fusion form a eutectic high-entropy alloy TPMS lattice structure. The material is AlCoCrFeNi2.1 eutectic high-entropy alloy powder, which specifically includes the following steps:

[0070] S1: The equipment used for laser powder bed fusion printing is a Concept Laser M2 device. Set the laser power to 200W, the scanning speed to 600mm / s, the scanning spacing to 100μm, the powder layer thickness to 40μm, and the scanning strategy is to rotate 90° between layers.

[0071] S2: Add the eutectic high-entropy alloy powder into the laser powder bed fusion printer, fill in inert gas argon as the protective gas, and then print the lattice structure.

[0072] S3: After printing, clean the powder, remove the component from the substrate by wire cutting, and perform ultrasonic vibration under alcohol conditions to clean the surface of the part, obtaining a eutectic high-entropy alloy TPMS lattice structure entity. After observation, no macroscopic cracking phenomenon appears in the printed entity, and the forming effect is good.

[0073] Use a compression testing machine to conduct a quasi-static compression test on the lattice structure. Obtain the force-displacement curve and calculate the specific energy absorption index.

[0074] S1: The compression testing machine used is a Sansi compression and flexural integrated testing machine, model number UTM7305, and the maximum test force is 300kN. The quasi-static compression rate is 0.1mm / s.

[0075] S2: The specific energy absorption calculation formula is: (F is the force, δ is the displacement, m is the mass).

[0076] The present invention also protects the manufactured parts of the eutectic high-entropy alloy TPMS lattice structure obtained by the above manufacturing process.

[0077] A quasi-static compression experiment was carried out on this embodiment, and the data was processed to obtain that the energy absorption per unit mass of the G40 embodiment was 32.5 J / g. Under the condition of similar relative density, the specific energy absorption was increased by about 55% compared with the research results of ALMAHRI S et al. (Additive Manufacturing, 2021, 46: 102220) (i.e., Figure 5 SS316L [1] in

[0078] Example 4

[0079] The present invention provides an additive manufacturing method for a high specific energy absorption eutectic high-entropy alloy curved lattice structure, and a eutectic high-entropy alloy TPMS lattice structure with specific energy absorption is obtained. The steps are as follows:

[0080] Step 1: Design a TPMS lattice structure with a relative density of 45%, and name it G45. Import the sliced file into a laser powder bed fusion printer, which specifically includes the following steps:

[0081] S1: The TPMS lattice structure design software is MSLattice. The overall size of the lattice structure is 30 mm × 30 mm × 30 mm, the unit cell size is 6 mm × 6 mm × 6 mm, and the lattice type is Gyroid.

[0082] S2: The software for placing and slicing the part is Materialise Magics.

[0083] Step 2: Laser powder bed fusion form a eutectic high-entropy alloy TPMS lattice structure. The material is AlCoCrFeNi2.1 eutectic high-entropy alloy powder, which specifically includes the following steps:

[0084] S1: The equipment used for laser powder bed fusion printing is a Concept Laser M2 device. Set the laser power to 200 W, the scanning speed to 600 mm / s, the scanning spacing to 100 μm, the powder layer thickness to 40 μm, and the scanning strategy to rotate 90° between layers.

[0085] S2: Add the eutectic high-entropy alloy powder into the laser powder bed fusion printer, fill in the inert gas argon as the protective gas, and then print the lattice structure.

[0086] S3. After printing is completed, clean the powder, remove the component from the substrate by wire cutting, and perform ultrasonic vibration under alcohol conditions to clean the surface of the part, obtaining a eutectic high-entropy alloy TPMS lattice structure entity. After observation, no macroscopic cracking phenomenon occurred in the printed entity, and the forming effect was good.

[0087] Use a compression testing machine to conduct a quasi-static compression test on the lattice structure. Obtain the force-displacement curve and calculate the specific energy absorption index.

[0088] S1. The compression testing machine used is a Sansi integrated compression and flexure testing machine, model UTM7305, with a maximum test force of 300 kN. The quasi-static compression rate is 0.1 mm / s.

[0089] S2. The formula for specific energy absorption is: (where F is force, δ is displacement, and m is mass).

[0090] The present invention also protects the eutectic high-entropy alloy TPMS lattice structure manufactured parts obtained by the above manufacturing process.

[0091] Conduct a quasi-static compression experiment on this embodiment, and process the data to obtain the specific energy absorption of the G45 embodiment as 33.5 J / g. Under the condition of similar relative density, the specific energy absorption is about 44% higher than the research results of ALMAHRI S et al. (Additive Manufacturing, 2021, 46: 102220) (i.e., Figure 5 the SS316L [1] in).

[0092] The present invention uses eutectic high-entropy alloy (EHEA) powder with energy absorption advantages as raw materials, and adopts a powder-based laser powder bed fusion process (LPBF) to form a three-dimensional sheet-like triply periodic minimal surface (TPMS) lattice structure, and can obtain a eutectic high-entropy alloy sheet-like TPMS lattice structure with excellent unit mass energy absorption performance (specific energy absorption, SEA). The eutectic high-entropy alloy sheet-like TPMS lattice structure obtained by laser powder bed fusion in the present invention applies the eutectic high-entropy alloy material to the energy absorption scenario of the lattice structure for the first time. It combines the energy absorption advantages of materials, structures, and processes, and the specific energy absorption is about 50% higher than that of traditional stainless steel lattice structures.

[0093] The AlCoCrFeNi2.1 eutectic high-entropy alloy applied in the present invention has a unique FCC / BCC dual-phase nanosheet structure. Coupled with the solid solution strengthening and dislocation strengthening mechanisms, the eutectic high-entropy alloy curved lattice structure formed by LPBF has a balance of high yield strength and high ductility, and the energy absorption characteristics are greatly improved.

[0094] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for additive manufacturing of a high specific energy absorption eutectic high entropy alloy curved lattice structure, characterized in that: The following steps are involved: Prepare eutectic high entropy alloy powder material and add it to the laser powder bed fusion printer, and fill the printer with inert gas as protective gas; Design the sheet-like TPMS lattice structure, export it as a slice file, and then import it into the laser powder bed fusion printer; Start printing the TPMS dot matrix structure; After printing is completed, the TPMS lattice structure is cut from the substrate using wire cutting to obtain the eutectic high entropy alloy curved surface lattice structure.

2. The additive manufacturing method of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 1, characterized in that: The eutectic high entropy alloy powder is AlCoCrFeNi2.1 high entropy alloy powder.

3. The additive manufacturing method of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 2, characterized in that: The preparation method of high entropy alloy is powder metallurgy method.

4. The additive manufacturing method of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 2, characterized in that: The particle size of the high entropy alloy powder is 15-53 μm.

5. The additive manufacturing method of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 2, characterized in that: The mass fraction composition of the high entropy alloy is: Al 8%-9%, Co 17%-19%, Cr15%-17%, Fe 16-18%, Ni 39%-41%.

6. A method for additive manufacturing of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to any one of claims 1 to 5, characterized in that: The sheet TPMS lattice structure is a Gyriod lattice structure, which is designed by the C level set method. The mathematical surface description formula of the Gyriod lattice structure is: ΦG=sinXcosY+sinYcosZ+sinZcosX=±C Wherein X=2πx, Y=2πy, Z=2πz, x, y, z are spatial coordinates, C is a constant, and the relationship between C and the relative density ρ of the lattice structure is ρ=0.65C.

7. The additive manufacturing method of a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 6, characterized in that: The sheet-like TPMS lattice structure has a size of 30 mm×30 mm×30 mm, a unit cell size of 6 mm×6 mm×6 mm, and a relative density of 30% or 35% or 40% or 45%.

8. The additive manufacturing method for a high specific energy absorption eutectic high entropy alloy curved lattice structure according to claim 6, characterized in that: During the laser powder bed fusion preparation process, the laser power used was 200 W, the scanning speed was 600 mm / s, the scanning spacing was 100 μm, and the powder layer thickness was 40 μm.

9. A eutectic high entropy alloy curved lattice structure, characterized in that: The eutectic high entropy alloy curved surface lattice structure is prepared by the method described in any one of claims 1 to 8.

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