High-entropy alloy and preparation method and application thereof

Abstract

The invention belongs to the field of high-entropy alloy preparation, and particularly relates to a high-entropy alloy and a preparation method and application thereof. The preparation method comprises the following steps: smelting a metal cylinder of a high-entropy alloy raw material to obtain a high-entropy alloy; n metal layers are sequentially arranged from the central axis of the metal cylinder to the outside in the radial direction, and the melting point of the nth metal layer is lower than that of the (n + 1) th metal layer; wherein n is 1, 2, 3,..., N-1, and N is a positive integer. According to the preparation method of the high-entropy alloy, the metal cylindrical high-entropy alloy raw materials are smelted, so that all the metals in the high-entropy alloy raw materials are smelted in a large-volume block (metal layer) mode, and oxidation of the easily-oxidized metals in the high-entropy alloy raw materials is reduced; the metal melting points are sequentially reduced outwards from the center axis of the metal cylinder in the radial direction, and burning loss of low-melting-point elements in the smelting process is reduced.

Description

Technical Field

[0001] The present invention relates to the field of high entropy alloy preparation, and specifically to a preparation method and application of a high entropy alloy. Background Art

[0002] High entropy alloy is a new type of material composed of five or more main elements, with the single atomic ratio of each element not less than 5%, so it is also called multi-component alloy. Due to the multi-component characteristics of the alloy, the alloy has a very high mixing entropy, can form a relatively stable single-phase super solid solution, and has a simple microstructure.

[0003] The unique effects of high entropy alloys (high entropy effect, hysteresis diffusion effect, lattice distortion effect and cocktail effect, etc.) can show many excellent properties (such as excellent high-temperature strength and hardness, good wear resistance and corrosion resistance, and excellent radiation resistance, etc.). Among them, the radiation resistance of high entropy alloys is reflected in its high lattice distortion. The formation energy of atomic vacancy defects during neutron irradiation is high, which is not conducive to the formation of defects; even if irradiation causes the formation of vacancy defects and interstitial atoms, the high lattice distortion makes it difficult for them to diffuse and aggregate to form large-sized defects. During plasma irradiation, deuterium, tritium and other plasmas retained in the material are not easy to agglomerate, avoiding the formation of large-sized hydrogen bubbles or helium bubbles, and even Fuss structures.

[0004] As for refractory high entropy alloys, currently they are mainly refractory high entropy alloys based on tungsten. The preparation methods of refractory high entropy alloys mainly include vacuum arc melting and spark plasma sintering. When the high entropy alloy contains easily oxidized metals, if it is prepared from powder as raw material, the metal oxide content in the prepared high entropy alloy is too high, which is difficult to remove and affects the mechanical properties and irradiation properties of the high entropy alloy. Summary of the invention

[0005] The present application proposes a preparation method and application of a high entropy alloy to solve at least one aspect of the above technical problems.

[0006] This application is implemented through the following technical solutions: The first aspect of the present application provides a method for preparing a high entropy alloy, comprising the following steps: The metal cylinder of the high entropy alloy raw material is melted to obtain the high entropy alloy; N metal layers are arranged radially outward from the central axis of the metal cylinder, and the melting point of the nth metal layer is lower than the melting point of the n+1th metal layer; Among them, n is 1, 2, 3, ..., N-1, and N is a positive integer.

[0007] In some possible implementations, the difference between the melting point of the (n+1)th metal layer and the melting point of the nth metal layer is 55° C. to 1563° C.

[0008] In some possible implementations, the value of N is less than or equal to the sum of the metal types of the high entropy alloy raw material.

[0009] In some possible implementations, the purity of each metal raw material in the high entropy alloy raw material is above 99.9%.

[0010] In some possible implementations, preparing the metal cylinder includes the following steps: According to the set volume ratio of the high entropy alloy raw material, the size of the metal cylinder and the total molar amount of the high entropy alloy, each metal material in the high entropy alloy raw material is machined into a corresponding metal layer; The metal cylinder is obtained by sleeve-connecting the metal layers.

[0011] In some possible implementations, the step of machining the metal material into the corresponding metal layers includes: first adding an innermost cylinder, and then machining the corresponding outer tubes in sequence; Processing of the innermost cylinder: Use a lathe to turn off the outer layer of the cylinder and process the cylinder diameter to the target size; Processing of the nth metal layer (n≠1): the inner wall of the hole and the outer wall of the tube of the nth metal tube are machined by a lathe; In some possible implementations, in the metal cylinder, the nth metal layer and the (n+1)th metal layer are interference fit.

[0012] In some possible implementations, the difference between the outer wall bottom diameter of the nth metal layer and the inner wall bottom diameter of the n+1th metal layer is 0.01 mm to 0.06 mm. It should be noted that when n is 1, the innermost metal layer is a solid cylinder with only the outer wall bottom diameter of the cylinder.

[0013] In some possible implementations, the bottom diameter of the metal cylinder is 30 mm to 200 mm. In this case, according to the volume calculation of the cylinder: volume = bottom area × height, when the heights of the metal layers in each layer of the metal cylinder are equal, the cross-sectional area ratio is equal to the volume ratio. It should be noted that the height of the metal cylinder can be adaptively adjusted according to the actual preparation, and no special restrictions are required in this application, but as an example, the height of the metal cylinder can be 150 mm.

[0014] In some possible implementations, the smelting method is suspension smelting, and the conditions of the suspension smelting include: being carried out in an inert gas atmosphere, the smelting temperature is 2800°C to 3300°C, the number of smelting is more than 5 times, and the smelting time of each time is 3 minutes to 5 minutes. In this case, after each smelting is completed, the ingot is turned over to prepare for the next smelting to improve the composition uniformity of the ingot.

[0015] In some possible implementations, the inert gas atmosphere is argon, helium or neon.

[0016] In some possible implementations, during the suspension smelting, a heating rate is 50° C. / s to 150° C. / s.

[0017] In some possible implementations, the suspension smelting step includes: placing the metal cylinder in a suspension smelting furnace; The suspension melting furnace was evacuated to a vacuum of 1 × 10 -3 After the pressure is below 0.01 MPa, fill with argon atmosphere until the gas pressure is 0.01 MPa~0.1 MPa; Melting steps: heating to 2800℃~3300℃ at a heating rate of 50℃ / s~150℃ / s, keeping warm for 3min~5min, cooling to 25℃~200℃ with the furnace, and turning the ingot over; The smelting step is repeated for more than 5 times to obtain the high entropy alloy.

[0018] In some possible implementations, the purity of the argon atmosphere is greater than 99.99%.

[0019] In some possible implementations, the high entropy alloy raw materials include four or more of W, Nb, Co, Ta, Mo, Ti, V, Cr, and Zr.

[0020] In some possible implementations, the raw material of the high entropy alloy consists of the following components in molar fractions: W: 20%~35%, Nb: 20%~30%, Ti: 10%~15%, Zr: 15%~35%, Cr: 6%~20%.

[0021] In some possible implementations, the raw material of the high entropy alloy consists of the following components in molar fractions: W: 20%~35%, Ta: 20%~30%, Nb: 10%~20%, Ti: 10%~15%, V: 15%~35%.

[0022] In some possible implementations, the raw material of the high entropy alloy consists of the following components in molar fractions: W: 20%~35%, Mo: 20%~30%, Ti: 10%~15%, Ta: 6%~20%, Zr: 10%~15%.

[0023] The second aspect of the present application provides a high entropy alloy prepared by the method for preparing a high entropy alloy of the present application. The third aspect of the present application provides an application of the high entropy alloy provided by the present application in the technical field of preparing refractory high entropy alloys.

[0024] Compared with the prior art, the high entropy alloy and the preparation method thereof provided in this application have at least the following beneficial technical effects: (1) The method for preparing a high entropy alloy provided in the present application comprises melting a cylindrical high entropy alloy raw material so that each metal in the high entropy alloy raw material is melted in a large-volume block (metal layer), thereby reducing the oxidation of the easily oxidizable metal in the high entropy alloy raw material.

[0025] (2) The preparation method of the high entropy alloy provided in the present application is that the melting point of each metal layer in the metal cylinder increases radially outward from the central axis of the metal cylinder. During smelting, the inner and outer metal layers are heated at the same time. The heating principle is that the eddy current generated in the metal by the alternating magnetic field heats the metal. The outermost metal has the highest temperature because it has the largest circumference. The temperature of the innermost metal is the lowest. However, due to the low melting point of the innermost metal, the element burnout of the inner metal after melting is also less, and the single element burnout rate is less than 10%.

[0026] (3) In the method for preparing a high entropy alloy provided in the present application, in the metal cylinder, the nth metal layer and the n+1th metal layer are interference fit, and during the smelting process, the metal layers will not easily fall off from each other, thereby affecting the melting effect.

[0027] (4) The preparation method of the high entropy alloy provided in the present application adopts suspension smelting to melt the metal cylinder so that the molten metal liquid does not contact the crucible, thereby avoiding the contamination of the molten pool by the crucible material and improving the purity and uniformity of the material.

[0028] (5) The high entropy alloy provided in the present application has a single-phase BCC structure, a density of more than 99%, and an oxygen content of 85ppm~105ppm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1This is a schematic diagram of the three-dimensional structure of a metal cylinder in a method for preparing a high entropy alloy in an embodiment of the present application; Figure 2 This is a schematic diagram of the cross-sectional structure of a metal cylinder in a method for preparing a high entropy alloy in Example 1 of the present application; Figure 3 The XRD spectrum of the high entropy alloy prepared by the method for preparing a high entropy alloy in Example 1 of the present application; Figure 4 This is a SEM image of a high entropy alloy prepared by a method for preparing a high entropy alloy in Example 2 of the present application; Figure 5 This is an EDS graph of tungsten metal element in a high entropy alloy prepared by a method for preparing a high entropy alloy in Example 2 of the present application; Figure 6 This is an EDS graph of tantalum metal element in a high entropy alloy prepared by a method for preparing a high entropy alloy in Example 2 of the present application; Figure 7 This is an EDS graph of vanadium metal element in a high entropy alloy prepared by a method for preparing a high entropy alloy in Example 2 of the present application; Figure 8 This is an EDS graph of titanium metal element in a high entropy alloy prepared by a method for preparing a high entropy alloy in Example 2 of the present application; Fig. 9 This is an EDS graph of niobium metal element in a high entropy alloy prepared by the method for preparing a high entropy alloy in Example 2 of the present application.

[0031] Explanation of reference numerals: 1-n-th metal layer, 2-n+1-th metal layer.

[0032] The purpose, features and advantages of this figure will be further described in conjunction with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0034] Obviously, the following descriptions are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in the field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0035] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter described in the claims.

[0036] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution, and all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0037] In the following specific embodiments, the melting points of the metals involved are as follows: Titanium (Ti): 1668℃; Zirconium (Zr): 1852℃; Chromium (Cr): 1907℃; Vanadium (V): 1917℃; Molybdenum (Mo): 2622℃; Tantalum (Ta): 2980℃; Tungsten (W): 3380℃.

[0038] Example 1 Example 1 provides a method for preparing a high entropy alloy, the steps are as follows: (1) Prepare a metal cylinder with a diameter of 60 mm and a height of 150 mm: ① The selected high entropy alloy raw material consists of the following components in molar fractions: W 35%, Nb 29%, Zr 15%, Cr6% and Ti 15%.

[0039] ② The required volume of each metal is calculated based on the metal density of W, Nb, Zr, Cr and Ti and the total mass of the high entropy alloy.

[0040] ③ According to the volume of each metal, the size of the metal cylinder and the melting point arrangement of each metal (melting point: Ti < Zr < Cr < Nb < W), and the cross-sectional area ratio of each metal layer is the volume ratio of the high entropy alloy raw material, each metal bar is machined into a metal layer of corresponding thickness (same height); Among them, arranged radially outward from the central axis of the metal cylinder are: Ti rod, Zr metal layer, Cr metal layer, Nb metal layer and W metal layer (i.e., titanium innermost layer and tungsten outermost layer); The nth metal layer and the n+1th metal layer are interference fit, and the diameter difference between the outer wall bottom surface of the nth metal layer and the inner wall bottom surface of the n+1th metal layer is 0.01mm-0.06mm.

[0041] ④Connect the metal layers to obtain a metal cylinder, as shown in the attached manual. Figure 1 and attached Figure 2 As shown in the instruction manual, Figure 1 This is a schematic diagram of the three-dimensional structure of a metal cylinder. Figure 2 Schematic diagram of the cross-sectional structure of a metal cylinder. 1 is the nth metal layer, 2 is the n+1th metal layer, and it should be noted that n is not limited to the attached Figure 1 The metal layer referred to in , and when n=1, the nth metal layer (i.e. the 1st metal layer) is the innermost layer, and the shape is a metal cylinder.

[0042] (2) Suspension smelting: ① Place the metal cylinder in a suspension smelting furnace.

[0043] ②Evacuate the suspension melting furnace to 1x10 -3 Pa, fill with argon atmosphere until the gas pressure reaches 0.05MPa.

[0044] ③ Heat to 2900℃ at a heating rate of 60℃ / s and keep warm for 3min. After cooling to 100℃ with the furnace, turn the ingot over.

[0045] ④ Repeat step ③ and smelt 5 times to obtain a high entropy alloy.

[0046] Example 2 Example 2 provides a method for preparing a high entropy alloy, the steps are basically the same as those of Example 1, except that: In step (1), ① the selected high entropy alloy raw material consists of the following components in molar fractions: W 25%, Ta 25%, Nb 20%, V 15% and Ti 15%.

[0047] In step (2), the heating rate of ③ is 120°C / s, the holding temperature is 3300°C, the holding time is 5 min, and the furnace is cooled to 200°C.

[0048] In step (2), the heating rate of ③ is 120°C / s, the holding temperature is 3300°C, the holding time is 5 min, and the furnace is cooled to 200°C.

[0049] Example 3 Example 3 provides a method for preparing a high entropy alloy, the steps are basically the same as those of Example 1, except that: In step (1), the high entropy alloy raw material selected is composed of the following components in molar fractions: W 30%, Mo 20%, Ta 20%, Ti 15% and Zr 15%.

[0050] In step (2), the heating rate of ③ is 90°C / s, the holding temperature is 2800°C, the holding time is 3 min, and the furnace is cooled to 25°C.

[0051] Comparative Example 1 Comparative Example 1 provides a method for preparing a high entropy alloy, the steps are as follows: (1) The selected high entropy alloy raw materials consist of the following components in molar fractions: W 35%, Nb 29%, Zr 15%, Cr 6% and Ti 15%.

[0052] (2) Mixing the metal powders of the high entropy alloy raw materials into a metal powder mixture and then performing suspension melting: ①Place the metal powder mixture in a suspension melting furnace.

[0053] ②Evacuate the suspension melting furnace to 1x10 -3 Pa, and then filled with argon atmosphere until the gas pressure reached 0.05 MPa.

[0054] ③Heat to 2800℃ at a heating rate of 100℃ / s and keep warm for 3 minutes.

[0055] ④ Cool down to 100℃ by furnace cooling, and then turn the ingot over.

[0056] ⑤ Cycle steps ③ and ④ for 5 times to obtain a high entropy alloy.

[0057] Comparative Example 2 Comparative Example 2 provides a method for preparing a high entropy alloy, the steps are as follows: (1) Preparation of metal smelting blocks ① The selected high entropy alloy raw material consists of the following components in molar fractions: W 35%, Nb 29%, Zr 15%, Cr6% and Ti 15%.

[0058] ② The required volume of each metal is calculated based on the metal density of W, Ta, Cr, V and Ti and the total mass of the high entropy alloy.

[0059] ③ According to the volume of each metal, the size of the metal cylinder and the melting point arrangement of each metal (melting point: Ti <Zr <Cr <Nb <W), and the cross-sectional area ratio of each metal layer is used as the volume ratio of the high entropy alloy raw material, the metal bars of Ti, V, and W are machined into metal layers of corresponding thickness (same height), and Zr and Nb are filled between the Ti and Cr metal layers, and the Cr and W metal layers in the form of metal powder, respectively, to obtain a metal molten block.

[0060] (2) Suspension smelting: The steps are basically the same as those in Example 1, except that part of the metal in this comparative example is smelted by powder (i.e., the smelted block obtained in step (1)).

[0061] Comparative Example 3 Comparative Example 3 provides a method for preparing a high entropy alloy, and the steps are basically the same as those of Example 1, except that: In step (1) ③, the metal cylinder is arranged radially outward from the central axis in the following order: Zr rod, Ti metal layer, Cr metal layer, Nb metal layer and W metal layer (i.e. zirconium is the innermost layer and tungsten is the outermost layer), i.e. arranged in ascending order by volume ratio.

[0062] Comparative Example 4 Comparative Example 4 provides a method for preparing a high entropy alloy, and the steps are basically the same as those of Example 1, except that: In step (2): ③Heat to 3400℃ at a heating rate of 10℃ / s and keep warm for 8min.

[0063] ④ Cool down to 500℃ by furnace cooling, and then turn the ingot over.

[0064] ⑤ Repeat steps ③ and ④ for 5 times to obtain a high entropy alloy.

[0065] Comparative Example 5 Comparative Example 5 provides a method for preparing a high entropy alloy, and the steps are basically the same as those of Example 1, except that: In step (2): ③Heat to 2700℃ at a heating rate of 300℃ / s and keep warm for 1min.

[0066] ④ Cool down to 400℃ by furnace cooling.

[0067] ⑤ Repeat steps ③ and ④ for 5 times to obtain a high entropy alloy.

[0068] In order to verify the progressiveness of the preparation method of a high entropy alloy provided in the embodiments of the present application, the total mole of the high entropy alloy is 100 mol, and the molar ratio, mass, mole, density, melting point, mass, volume and volume ratio of the high entropy alloy raw materials in Examples 1 to 3 are shown in Table 1 below (the other embodiments and comparative examples use the high entropy alloy of Example 1, so they are omitted). Taking Example 1, Example 2, Comparative Example 1 and Comparative Example 2 as examples, a high entropy alloy with a total mole of 100 mol is prepared, and the density, oxygen content and phase structure of the prepared high entropy alloy are tested. The test results are shown in Table 2 below. Taking Example 1 as an example, the XRD spectrum of the high entropy alloy prepared by the preparation method of Example 1 (the standard PDF card is 89-9000, and the crystal form is tungsten cubic (Tungsten, Cubic)) is as shown in the attached manual Figure 3 Taking Example 2 as an example, the element distribution of the high entropy alloy prepared by the preparation method of Example 1 was detected by using an X-ray spectrometer of a scanning electron microscope, as shown in the attached manual. Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, Figure 4 This is the SEM image of the high entropy alloy prepared in Example 2. Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 These are the EDS images of tungsten, tantalum, vanadium, titanium and niobium metal elements in high entropy alloys.

[0069] in, 1. The Archimedean drainage method was used to test the density of the high entropy alloys prepared in Example 1, Example 2, Comparative Example 1 and Comparative Example 2, respectively. The steps are as follows: (1) Weigh the clean sample to be tested with a mass of m0 in air.

[0070] (2) The sample to be tested is sealed with wax to prevent water from penetrating into the sample. After sealing with wax, the mass of the sample in the air is measured as m1.

[0071] (3) Place the wax-sealed sample in water and measure its mass in water as m2.

[0072] (4) According to Archimedes' principle, the density of the sample (ρ m ) can be calculated by the following formula:

[0073] Where ρ0 is the density of water.

[0074] (5) Compare the calculated density with the theoretical density of the sample to obtain the density. The theoretical density can be calculated from the density and atomic percentage of each component element.

[0075] 2. In the high entropy alloys prepared in the examples and comparative examples, XRD was used to detect the oxygen content of the high entropy alloys and observe the phase structure of the alloys.

[0076] Table 1 .

[0077] Table 2 .

[0078] From Table 1, Table 2, and the instruction manual Figure 3 , Attachment Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 At least the following conclusions can be drawn: (1) As can be seen from Table 2, the preparation method of the high entropy alloy provided in the embodiment of the present application uses a block (metal layer) of metal instead of metal powder to smelt the high entropy alloy, but its density can reach more than 99%.

[0079] (2) From Table 2, Appendix Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 It can be seen that the preparation method of the high entropy alloy provided in the embodiment of the present application adopts a cylindrical block (metal layer) metal structure instead of metal powder for smelting to obtain the high entropy alloy, which can reduce the oxidation of the easily oxidized metal in the high entropy alloy raw material; and the metal melting point is set to decrease radially outward from the central axis of the metal cylinder, thereby reducing the burning loss of low-melting-point elements during the smelting process.

[0080] (3) According to Table 2 and the instructions Figure 4 It can be seen that the high entropy alloy prepared by the preparation method of the high entropy alloy provided in the embodiment of the present application has a BCC single-phase structure (Body-Centered Cubic crystal structure).

[0081] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing a high entropy alloy, characterized in that: The steps include: The metal cylinder of the high entropy alloy raw material is melted to obtain the high entropy alloy; N metal layers are arranged radially outward from the central axis of the metal cylinder, and the melting point of the nth metal layer is lower than the melting point of the n+1th metal layer; Among them, n is 1, 2, 3, ..., N-1, and N is a positive integer.

2. The method for preparing a high entropy alloy according to claim 1, characterized in that: The difference between the melting point of the n+1th metal layer and the melting point of the nth metal layer is 55° C. to 1563° C.

3. The method for preparing a high entropy alloy according to claim 1, characterized in that: The preparation of the metal cylinder comprises the following steps: According to the set volume ratio of the high entropy alloy raw material, the size of the metal cylinder and the total molar amount of the high entropy alloy, each metal material in the high entropy alloy raw material is machined into a corresponding metal layer; The metal cylinder is obtained by sleeve-connecting the metal layers.

4. The method for preparing a high entropy alloy according to claim 3, characterized in that: In the metal cylinder, the nth metal layer and the (n+1)th metal layer are interference fit.

5. The method for preparing a high entropy alloy according to claim 4, characterized in that: The difference between the diameter of the bottom surface of the outer wall of the nth metal layer and the diameter of the bottom surface of the inner wall of the (n+1)th metal layer is 0.01 mm to 0.06 mm.

6. The method for preparing a high entropy alloy according to claim 1, characterized in that: The bottom diameter of the metal cylinder is 30 mm to 200 mm.

7. The method for preparing a high entropy alloy according to any one of claims 1 to 6, characterized in that: The smelting method is suspension smelting, and the conditions of the suspension smelting include: being carried out in an inert gas atmosphere, the smelting temperature is 2800°C to 3300°C, the number of smelting times is more than 5 times, and the smelting time for each time is 3min to 5min.

8. The method for preparing a high entropy alloy according to claim 7, characterized in that: The suspension smelting step comprises: placing the metal cylinder in a suspension smelting furnace; The suspension melting furnace was evacuated to a vacuum of 1 × 10 -3 After the pressure is below Pa, fill with argon atmosphere until the gas pressure is 0.01MPa~0.1MPa; Melting steps: heating to 2800℃~3300℃ at a heating rate of 50℃ / s~150℃ / s, keeping warm for 3min~5min, cooling to 25℃~200℃ with the furnace, and turning the ingot; The smelting step is repeated for more than 5 times to obtain the high entropy alloy.

9. A high entropy alloy obtained by the method for preparing a high entropy alloy as claimed in any one of claims 1 to 8.

10. Use of the high entropy alloy as claimed in claim 9 in the technical field of preparation of refractory high entropy alloys.

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