Amorphous-high-entropy alloy double-phase composite material based on pinctada martensii bionic structure

Abstract

The invention relates to the field of alloy material design, in particular to an amorphous-high-entropy alloy double-phase composite material based on a pinctada maxima bionic structure, and a preparation method comprises the following steps: step 1, respectively weighing amorphous alloy powder and high-entropy alloy powder for later use; 2, amorphous alloy powder and high-entropy alloy powder are laid layer by layer according to designed spatial distribution of two phases, and the distribution area of the two phases in each layer of powder is accurately controlled; and 3, the biphase metal powder is sintered and fixed through laser heating, then the next layer of laid powder is subjected to laser sintering again till the whole structure is printed, and finally the biphase composite material is obtained. According to the invention, the defects that the traditional amorphous alloy is poor in toughness and difficult to process into a large-scale structural member can be greatly improved, and the properties such as strength and wear resistance of the traditional alloy are enhanced to a certain extent.

Description

Technical Field

[0001] The invention relates to the field of alloy material design, and in particular to an amorphous-high entropy alloy two-phase composite material based on a nacre bionic structure. Background Art

[0002] Amorphous alloys are amorphous solids obtained by extremely rapid cooling. Unlike traditional crystalline alloys, they do not have defects such as dislocations and grain boundaries, making their yield strength close to the theoretical limit; but because plastic deformation is highly localized in a narrow shear band, they will present a brittle fracture chamber at room temperature; at the same time, they are difficult to process into large structural parts due to the cooling rate limit. High entropy alloys are a kind of multi-principal alloys that have emerged in recent years with long-range chemical disorder and topological order in microstructure, and they still maintain good mechanical and physical properties under many extreme conditions.

[0003] Composite materials are materials that are made of two or more materials of different properties through physical or chemical methods. Different materials complement each other and produce synergistic effects, so that composite materials have special properties that single materials do not have, such as strong and tough synergy, high strength and light weight, etc. However, traditional design methods often use "trial and error" to design materials, and it is difficult to find the optimal geometric configuration. Bionic materials are materials made by research and development that imitate the characteristics of natural organisms. They can greatly reduce the cost of "trial and error". At the same time, due to their unique geometric structure, they show excellent comprehensive mechanical properties. Among them, biological materials such as shells have evolved natural protective armor to adapt to the harsh external living environment and are ideal protective materials. Cross-layered bionic structures are mostly found in shells of gastropods, bivalves and excavators. They have complex microscopic hierarchical structures and therefore have good ductility. Therefore, ideal materials with high strength, high toughness and high protective performance can be designed with reference to the cross-layered geometric structure. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an amorphous-high entropy alloy two-phase composite material based on the nacre bionic structure. By imitating the cross-layered bionic structure in the nacre and combining the FCC phase high entropy alloy with the amorphous alloy, the room temperature plasticity of the material is greatly improved while retaining high strength; at the same time, it is also relatively convenient to prepare using 3D printing technology, and due to its periodic structure, it is easy to process into large structural parts.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure, comprising the following steps:

[0007] Step 1, weighing amorphous alloy powder and high entropy alloy powder respectively for later use;

[0008] Step 2, spreading the amorphous alloy powder and the high entropy alloy powder layer by layer according to the designed spatial distribution of the two phases, and accurately controlling the distribution area of ​​the two phases in each layer of powder;

[0009] Step 3: Sinter and fix the dual-phase metal powder by laser heating, and then apply the next layer of powder and laser sinter again until the entire structure is printed, and finally obtain a dual-phase composite material.

[0010] Preferably, in step 1, the amorphous alloy is Zr 50 Cu 40 Al 10 ; The high entropy alloy is CrCoFeMnNiTaB, wherein the high entropy alloy is calculated by mass fraction and includes the following components:

[0011] Cr: 19%, Co: 19%, Fe: 19%, Mn: 19%, Ni: 19%, Ta: 4.47% and B: 0.53%.

[0012] Preferably, in step 1, the method for preparing the high entropy alloy comprises:

[0013] S1. Weigh raw materials Cr powder, Co powder, Fe powder, Mn powder, Ni powder and TaB2 powder as raw material powders;

[0014] S2. Place the raw material powders in the melting chamber of the vacuum melting furnace from top to bottom according to their melting points, i.e. place the metal material with the smallest melting point at the bottom and the metal material with the largest melting point at the top. Introduce argon as a protective gas and evacuate the melting chamber to 1-3×10 -3 After Pa, smelting is carried out. After smelting, the rough billet of alloy material is taken out after cooling for 10-20 minutes;

[0015] S3. The alloy material rough billet is heated to 850-950°C at a rate of 5-10°C / min, kept warm for 2-3h, and cooled to room temperature by water quenching; then multi-roll rolling is performed to make the downward pressure reach 50-70%; aging treatment is performed at 700-800°C for 24-120h, and cooled to room temperature by water quenching to obtain a high entropy alloy.

[0016] Preferably, the method for preparing the TaB2 powder comprises:

[0017] Tantalum powder and boron powder with a mass ratio of 1.81:0.22-0.28 were weighed respectively, and the particle size was 5μm. After mixing, they were fully ground for 1-2h, pressed into a flat material, and then placed in a closed high-temperature reaction furnace. Argon was introduced as a protective gas, and the pressure was set to 3000-5000MPa. The temperature was raised to 1250-1350℃ at a rate of 5-10℃ / min. After treating for 30-40min, it was cooled to room temperature with the furnace to obtain TaB2 powder.

[0018] Preferably, in step 2, the volume ratio of the amorphous alloy powder to the high entropy alloy powder is 0.1-1:0.1-1.

[0019] Preferably, in step 2, the thickness of each layer of powder is 10-100 μm.

[0020] Preferably, in step 3, the power of the laser is 220-360 W, the scanning speed is 300-800 mm / s, and the scanning interval between adjacent passes is 50-80 μm.

[0021] Preferably, in step 3, the two-phase composite material is a cross-laminated structure, and the specific structure includes four levels: unit cell, thin plate, skeleton and block; wherein the unit cell is composed of two metal sheet layers, the geometric size is adjustable, and the angle is between 90 degrees and 120 degrees; the thin plate is a planar linear lattice structure finally formed by copying and extending the unit cell in two mutually perpendicular directions X and Y (both are 45 degrees to a metal sheet layer in the unit cell) on a two-dimensional plane; the skeleton is a three-dimensional periodic structure composed of multiple layers of thin plates bonded together in the Z direction; the block is the final composite material obtained by combining the skeletons of the two phases together.

[0022] Preferably, in step 3, the dual-phase composite material can be made into a composite material structure more suitable for working conditions by adjusting the size and angle of the unit cell structure, or the different volume fractions of the two phases.

[0023] Preferably, in step 3, the geometric parameters in the unit cell are a=5-20nm, b=1-5nm, c=0.5-3nm, θ=90-120°.

[0024] More preferably, in step 3, the geometric parameters in the unit cell are a=10 nm, b=3 nm, c=1 nm, and θ=120°.

[0025] In a second aspect, the present invention provides an amorphous-high entropy alloy two-phase composite material based on the nacre bionic structure, which is prepared by the above-mentioned preparation method.

[0026] The beneficial effects of the present invention are:

[0027] 1. Compared with the prior art, the amorphous-high entropy alloy dual-phase composite material based on the nacre bionic structure provided by the present invention uses a Zr 50 Cu 40 Al 10 The high entropy alloy is CrCoFeMnNiTaB, which can greatly improve the shortcomings of traditional amorphous alloys such as poor toughness and difficulty in processing into large structural parts, and to a certain extent enhance the strength and wear resistance of traditional alloys.

[0028] 2. The multi-level structure provided by the present invention creates a new configuration that combines regional structural characteristics with overall periodicity, and greatly improves the toughness of the material by inhibiting the formation and transmission of shear bands, the initiation and expansion of cracks. Moreover, the geometric parameters of the basic unit cell are easy to control, and the manufacturing based on metal 3D printing technology makes the structure rich in changes, and the mechanical properties and fracture mechanism are easy to control; and the manufacturing difficulty is low, and it is easy to process into large structural parts.

[0029] 3. In the dual-phase composite material prepared by the present invention, the high entropy alloy is CrCoFeMnNiTaB. Compared with the conventional CrCoFeMnNi alloy, TaB2 is added as a reinforcing modifier, which effectively improves the strength of the alloy through lattice distortion effect and precipitation strengthening mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the process of preparing a dual-phase composite material according to Invention Example 1;

[0032] Figure 2 A schematic diagram of the structure of a unit cell of a dual-phase composite material prepared in Example 1 of the invention; (a is the unit length, b is the unit width, c is the unit thickness, and θ is the angle between the two metal sheets of the unit cell);

[0033] Figure 3 The second-level structural unit sheet of the dual-phase composite material prepared in Example 1 of the invention, that is, the planar lattice structure formed by the unit cell, the black part in the figure is the amorphous alloy phase, and the white part is the high entropy alloy phase;

[0034] Figure 4 The third-level structural unit skeleton of the dual-phase composite material prepared in Example 1 of the present invention, that is, a spatial periodic structure formed by combining multiple layers of thin plates, wherein the white solid part is the skeleton of one phase;

[0035] Figure 5This is a schematic diagram of the overall block structure of the dual-phase composite material prepared in Example 1 of the present invention. The complete structure can be obtained by stacking the two-phase skeletons together. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0037] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0038] The present invention will be further described below in conjunction with the following examples.

[0039] Example 1

[0040] A method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure comprises the following steps:

[0041] Step 1, weigh the amorphous alloy powder and high entropy alloy powder respectively, the amorphous alloy is Zr 50 Cu 40 Al 10 The high entropy alloy is CrCoFeMnNiTaB, wherein the high entropy alloy comprises the following components calculated by mass fraction: Cr: 19%, Co: 19%, Fe: 19%, Mn: 19%, Ni: 19%, Ta: 4.47% and B: 0.53%;

[0042] Step 2, spreading the amorphous alloy powder and the high entropy alloy powder layer by layer according to the designed spatial distribution of the two phases, and accurately controlling the distribution area of ​​the two phases in each layer of powder; wherein the volume ratio of the amorphous alloy powder to the high entropy alloy powder is 1:1, and the thickness of each layer of powder is 30 μm;

[0043] Step 3: The dual-phase metal powder is sintered and fixed by laser heating. The laser power is 280W, the scanning speed is 500mm / s, and the scanning interval between adjacent passes is 60μm. Then the next layer of powder is spread and laser sintered again until the entire structure is printed. Finally, a dual-phase composite material with a cross-laminated structure is obtained. The specific structure includes four levels: unit cell, thin plate, skeleton and block (such as Figure 2-5 ); the unit cell consists of two metal sheets, and the geometric size can be adjusted, such as Figure 2 As shown, the geometric parameters in the unit cell are a=10nm, b=3nm, c=1nm, θ=120°; the thin plate is a planar linear lattice structure formed by replicating and extending the unit cell in two mutually perpendicular directions X and Y (both are 45 degrees to a metal sheet layer in the unit cell) on a two-dimensional plane; the skeleton is a three-dimensional periodic structure composed of multiple layers of thin plates bonded together in the Z direction; the block is the final composite material obtained by combining the skeletons of the two phases.

[0044] In the above step 1, the method for preparing the high entropy alloy comprises:

[0045] S1. Weigh tantalum powder and boron powder with a mass ratio of 1.81:0.25 respectively, with a particle size of 5 μm. Mix and grind them for 1 hour, press them into a flat material, and then place them in a closed high-temperature reaction furnace. Pass argon as a protective gas, set the pressure to 4000 MPa, heat to 1300 ° C at a rate of 6 ° C / min, treat for 30 minutes, and cool to room temperature with the furnace to obtain TaB2 powder;

[0046] S2, weighing raw materials Cr powder, Co powder, Fe powder, Mn powder, Ni powder and TaB2 powder as raw material powders;

[0047] S3. Place the raw material powders in the melting chamber of the vacuum melting furnace from top to bottom according to their melting points, i.e. place the metal material with the smallest melting point at the bottom and the metal material with the largest melting point at the top. Introduce argon as a protective gas and evacuate the melting chamber to 2×10 -3 After Pa, smelting is carried out. After smelting, the rough billet of alloy material is taken out after cooling for 15 minutes;

[0048] S4. The alloy material rough billet is heated to 900°C at a rate of 8°C / min, kept warm for 2 hours, and cooled to room temperature by water quenching; then multi-roll rolling is performed so that the pressing amount reaches 60%; aging treatment is performed at 750°C for 72 hours, and the high entropy alloy is obtained by water quenching.

[0049] Example 2

[0050] A method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure comprises the following steps:

[0051] Step 1, weigh the amorphous alloy powder and high entropy alloy powder respectively, the amorphous alloy is Zr 50 Cu 40 Al 10 The high entropy alloy is CrCoFeMnNiTaB, wherein the high entropy alloy comprises the following components calculated by mass fraction: Cr: 19%, Co: 19%, Fe: 19%, Mn: 19%, Ni: 19%, Ta: 4.47% and B: 0.53%;

[0052] Step 2, spreading the amorphous alloy powder and the high entropy alloy powder layer by layer according to the designed spatial distribution of the two phases, and accurately controlling the distribution area of ​​the two phases in each layer of powder; wherein the volume ratio of the amorphous alloy powder to the high entropy alloy powder is 0.5:1, and the thickness of each layer of powder is 20 μm;

[0053] Step 3, the dual-phase metal powder is sintered and fixed by laser heating. The laser power is 250W, the scanning speed is 600mm / s, and the scanning interval between adjacent passes is 70μm. Then the next layer of powder is spread and laser sintered again until the entire structure is printed. Finally, a cross-laminated dual-phase composite material is obtained. The specific structure includes four levels: unit cell, thin plate, skeleton and block; among them, the unit cell is composed of two metal sheets, and the geometric size can be adjusted, such as Figure 2 As shown, the geometric parameters in the unit cell are a=5nm, b=1nm, c=0.5nm, θ=90°; the thin plate is a planar linear lattice structure formed by replicating and extending the unit cell in two mutually perpendicular directions X and Y on a two-dimensional plane; the skeleton is a three-dimensional periodic structure composed of multiple layers of thin plates bonded together in the Z direction; the block is the final composite material obtained by combining the skeletons of the two phases.

[0054] In the above step 1, the method for preparing the high entropy alloy comprises:

[0055] S1. Weigh tantalum powder and boron powder with a mass ratio of 1.81:0.22 respectively, with a particle size of 5 μm. Mix and grind them for 1 hour, press them into a flat material, and then place them in a closed high-temperature reaction furnace. Pass argon as a protective gas, set the pressure to 3000 MPa, heat to 1250°C at a rate of 5°C / min, treat for 40 minutes, and cool them to room temperature with the furnace to obtain TaB2 powder;

[0056] S2, weighing raw materials Cr powder, Co powder, Fe powder, Mn powder, Ni powder and TaB2 powder as raw material powders;

[0057] S3. Place the raw material powders in the melting chamber of the vacuum melting furnace from top to bottom according to their melting points, i.e. place the metal material with the smallest melting point at the bottom and the metal material with the largest melting point at the top. Introduce argon as a protective gas and evacuate the melting chamber to 1×10 -3 After Pa, smelting is carried out. After smelting, the rough billet of alloy material is taken out after cooling for 10 minutes;

[0058] S4. The alloy material blank is heated to 950°C at a rate of 10°C / min, kept at this temperature for 2 hours, and cooled to room temperature by water quenching; then multi-roll rolling is performed so that the pressing amount reaches 70%; aging treatment is performed at 800°C for 24 hours, and the temperature is cooled to room temperature by water quenching to obtain a high entropy alloy.

[0059] Example 3

[0060] A method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure comprises the following steps:

[0061] Step 1, weigh the amorphous alloy powder and high entropy alloy powder respectively, the amorphous alloy is Zr 50 Cu 40 Al 10 The high entropy alloy is CrCoFeMnNiTaB, wherein the high entropy alloy comprises the following components calculated by mass fraction: Cr: 19%, Co: 19%, Fe: 19%, Mn: 19%, Ni: 19%, Ta: 4.47% and B: 0.53%;

[0062] Step 2, spreading the amorphous alloy powder and the high entropy alloy powder layer by layer according to the designed spatial distribution of the two phases, and accurately controlling the distribution area of ​​the two phases in each layer of powder; wherein the volume ratio of the amorphous alloy powder to the high entropy alloy powder is 0.4:0.6, and the thickness of each layer of powder is 80 μm;

[0063] Step 3, the dual-phase metal powder is sintered and fixed by laser heating. The laser power is 300W, the scanning speed is 700mm / s, and the scanning interval between adjacent passes is 80μm. Then the next layer of powder is spread and laser sintered again until the entire structure is printed. Finally, a cross-laminated dual-phase composite material is obtained. The specific structure includes four levels: unit cell, thin plate, skeleton and block; among them, the unit cell is composed of two metal sheets, and the geometric size can be adjusted, such as Figure 2As shown, the geometric parameters in the unit cell are a=20nm, b=5nm, c=3nm, θ=120°; the thin plate is a planar linear lattice structure formed by replicating and extending the unit cell in two mutually perpendicular directions X and Y on a two-dimensional plane; the skeleton is a three-dimensional periodic structure composed of multiple layers of thin plates bonded together in the Z direction; the block is the final composite material obtained by combining the skeletons of the two phases.

[0064] In the above step 1, the method for preparing the high entropy alloy comprises:

[0065] S1. Weigh tantalum powder and boron powder with a mass ratio of 1.81:0.28 respectively, with a particle size of 5 μm. Mix and grind them for 2 hours, press them into a flat material, and then place them in a closed high-temperature reaction furnace. Pass argon as a protective gas, set the pressure to 5000 MPa, heat to 1350 ° C at a rate of 10 ° C / min, treat for 30 minutes, and cool to room temperature with the furnace to obtain TaB2 powder;

[0066] S2, weighing raw materials Cr powder, Co powder, Fe powder, Mn powder, Ni powder and TaB2 powder as raw material powders;

[0067] S3. Place the raw material powders in the melting chamber of the vacuum melting furnace from top to bottom according to their melting points, i.e. place the metal material with the smallest melting point at the bottom and the metal material with the largest melting point at the top. Introduce argon as a protective gas and evacuate the melting chamber to 3×10 -3 After Pa, smelting is carried out. After smelting, the rough billet of alloy material is taken out after cooling for 20 minutes;

[0068] S4. The alloy material blank is heated to 850°C at a rate of 5°C / min, kept warm for 3 hours, and cooled to room temperature by water quenching; then multi-roll rolling is performed to make the downward pressure reach 50%; aging treatment is performed at 700°C for 120 hours, and the temperature is cooled to room temperature by water quenching to obtain a high entropy alloy.

[0069] Comparative Example 1

[0070] A method for preparing an amorphous-high entropy alloy dual-phase composite material, which differs from Example 1 only in that the amorphous alloy is Zr 50 Cu 40 Al 10 ; The high entropy alloy is CrCoFeMnNi, wherein the high entropy alloy includes the following components calculated by mass fraction: Cr: 20%, Co: 20%, Fe: 20%, Mn: 20%, Ni: 20%.

[0071] Comparative Example 2

[0072] A method for preparing an amorphous-high entropy alloy dual-phase composite material, which differs from Example 1 only in that the amorphous alloy is Zr 50 Cu 40 Al 10 ; The high entropy alloy is CrCoFeMnNi, wherein the high entropy alloy includes the following components calculated by mass fraction: Cr: 20%, Co: 20%, Fe: 20%, Mn: 20%, Ni: 20%; and the angle between the two metal sheets of the unit cell is controlled to be θ=180°.

[0073] In order to verify the performance advantages of the present invention, mechanical tests were conducted. The results showed that the dual-phase composite material prepared in Example 1 of the present invention has excellent mechanical properties while maintaining a low density, and its yield strength is significantly better than that of traditional materials.

[0074] The properties of the dual-phase composite materials prepared in Example 1 and Comparative Examples 1-2 were tested. The strength test standard was based on GB / T 228.1. The corrosion resistance was tested using an M-2000 friction and wear tester (load 120N, 200r / min, 30min). The results are shown in the following table:

[0075]

[0076] It can be seen from the above table that compared with the comparative example, the strength and wear resistance of the dual-phase composite material prepared in Example 1 are better. Therefore, it can be shown that the dual-phase composite material obtained by the treatment of the present invention enhances the strength, wear resistance and other properties of the traditional alloy to a certain extent.

[0077] Finally, it should be made clear that the dual phases in the present invention are an amorphous alloy phase and a high entropy alloy phase. However, when the spatial distribution of the dual phase structure is determined, the amorphous alloy phase and the crystalline alloy phase mentioned in the present invention can be replaced by other different metal alloy phases. For example, both phases are amorphous alloys or both are high entropy alloys but the specific components are different. Therefore, the present invention should not be limited to the above disclosure, and the scope of protection required should be based on the scope defined in the claims.

[0078] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure, characterized in that: The following steps are involved: Step 1, weighing amorphous alloy powder and high entropy alloy powder respectively for later use; Step 2, spreading the amorphous alloy powder and the high entropy alloy powder layer by layer according to the designed spatial distribution of the two phases, and accurately controlling the distribution area of ​​the two phases in each layer of powder; Step 3: Sinter and fix the dual-phase metal powder by laser heating, and then apply the next layer of powder and laser sinter again until the entire structure is printed, and finally obtain a dual-phase composite material.

2. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: In step 1, the amorphous alloy is Zr 50 Cu 40 Al 10 ; The high entropy alloy is CrCoFeMnNiTaB, wherein the high entropy alloy is calculated by mass fraction and includes the following components: Cr: 19%, Co: 19%, Fe: 19%, Mn: 19%, Ni: 19%, Ta: 4.47% and B: 0.53%.

3. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: In step 1, the preparation method of the high entropy alloy comprises: S1. Weigh raw materials Cr powder, Co powder, Fe powder, Mn powder, Ni powder and TaB2 powder as raw material powders; S2. Place the raw material powders in the melting chamber of the vacuum melting furnace from top to bottom according to their melting points, i.e. place the metal material with the smallest melting point at the bottom and the metal material with the largest melting point at the top. Introduce argon as a protective gas and evacuate the melting chamber to 1-3×10 -3 After Pa, smelting is carried out. After smelting, the rough billet of alloy material is taken out after cooling for 10-20 minutes; S3. The alloy material rough billet is heated to 850-950°C at a rate of 5-10°C / min, kept warm for 2-3h, and cooled to room temperature by water quenching; then multi-roll rolling is performed to make the downward pressure reach 50-70%; aging treatment is performed at 700-800°C for 24-120h, and cooled to room temperature by water quenching to obtain a high entropy alloy.

4. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: In step 2, the volume ratio of the amorphous alloy powder to the high entropy alloy powder is 0.1-1:0.1-1.

5. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: The thickness of each powder layer is 10-100μm.

6. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: In step 3, the power of the laser is 220-360 W, the scanning speed is 300-800 mm / s, and the scanning interval between adjacent passes is 50-80 μm.

7. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 1, characterized in that: In step 3, the two-phase composite material is a cross-laminated structure, and the specific structure includes four levels: unit cell, thin plate, skeleton and block.

8. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 7, characterized in that: In step 3, the geometric parameters in the unit cell are: unit length a=5-20nm, unit width b=1-5nm, unit thickness c=0.5-3nm, and the angle θ between the two metal sheets of the unit cell is 90-120°.

9. The method for preparing an amorphous-high entropy alloy dual-phase composite material based on a nacre bionic structure according to claim 7, characterized in that: In step 3, the geometric parameters in the unit cell are: unit length a=10nm, unit width b=3nm, unit thickness c=1nm, and the angle θ between the two metal sheets of the unit cell is 120°.

10. An amorphous-high entropy alloy dual-phase composite material based on nacre bionic structure, characterized in that: The amorphous-high entropy alloy dual-phase composite material is prepared by the preparation method described in claim 1.

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