Method for preparing high-entropy alloy through hydrocarbon synergistic reduction and high-entropy alloy

Abstract

The invention provides a method for preparing a high-entropy alloy through hydrocarbon synergistic reduction and the high-entropy alloy. The method comprises the steps that 1, metal precursor salt is taken and dissolved in a solvent to prepare a metal precursor mixed solution, a metal precursor homogeneous solution is obtained after reaction, and metal precursor powder is obtained after drying; step 2, dispersing an amine compound and an aldehyde compound in a solvent, carrying out Schiff base reaction to obtain a carbon precursor solution, and drying to obtain carbon precursor powder; 3, the carbon precursor powder and the metal precursor powder are mixed according to the mass ratio of 1: (1-10) and then annealed at the temperature of 800-1100 DEG C in the atmosphere of Ar / H2, and the nano refractory high-entropy alloy is formed; a plurality of metal salts are fully mixed and react in a solvent to form a homogeneous metal salt mixed solution, so that the problems of phase separation and the like caused by overlarge atomic radius difference are solved, interstitial atom doping can be realized in situ, and other methods are not needed for doping.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nano-refractory high-entropy alloys, and particularly relates to a method for preparing a high-entropy alloy through carbon-hydrogen synergistic reduction and the high-entropy alloy. BACKGROUND

[0002] In the preparation process of high-entropy alloys, due to the inherent differences in physical and chemical properties (such as atomic radius, electronegativity, crystal structure, etc.) between the constituent elements, the multi-metal system often shows a significant tendency of thermodynamic immiscibility. This characteristic makes the alloy prone to phase separation under conventional preparation conditions, forming intermetallic phases with strong chemical ordering characteristics. However, the formation of such ordered structures is often accompanied by a significant decrease in plasticity, resulting in intrinsic brittleness of the alloy, which severely restricts its engineering application potential. To overcome this challenge, traditional preparation processes usually adopt an extreme high-temperature reduction strategy (such as arc melting temperature exceeding 2000℃), promoting rapid diffusion and full mixing of all metal atoms to suppress the formation tendency of ordered phases, thereby obtaining an ideal disordered single-phase solid solution structure. However, this high-temperature process is accompanied by significant energy consumption, significantly increasing production costs, which is contrary to the green manufacturing philosophy. Therefore, developing new low-temperature preparation techniques to suppress phase separation while avoiding the negative effects of high temperature has become a key scientific problem that needs to be solved in the field of high-entropy alloys. SUMMARY

[0003] To solve the problems in the prior art, the purpose of the present application is to provide a method for preparing a high-entropy alloy through carbon-hydrogen synergistic reduction and the high-entropy alloy, which can realize the preparation of nano-refractory high-entropy alloys at a lower temperature, overcome the problem of phase separation caused by too large atomic radius difference, and form nano-refractory high-entropy alloys with high purity, uniform size, high temperature resistance, and excellent electrical properties.

[0004] The present application is realized by the following technical solutions:

[0005] A method for preparing a high-entropy alloy through carbon-hydrogen synergistic reduction, comprising:

[0006] Step 1: Dissolve metal precursor salts in a solvent to prepare a metal precursor mixed solution, obtain a metal precursor homogeneous solution after reaction, and obtain a metal precursor powder after drying;

[0007] Step 2: Disperse amine compounds and aldehyde compounds in a solvent to obtain a carbon precursor solution through Schiff base reaction, and obtain a carbon precursor powder after drying;

[0008] Step 3: Mix the carbon precursor powder and the metal precursor powder in a mass ratio of 1:(1-10), and then anneal at 800-1100℃ under Ar / H2 atmosphere to form a nano-refractory high-entropy alloy;

[0009] The metal precursor salt is selected from at least five of ammonium molybdate, ammonium tungstate, ammonium niobate, niobium oxalate, ammonium niobate oxalate hydrate, molybdenum hexacarbonyl, tungsten hexacarbonyl, tantalum ethoxide, tantalum chloride, gallium nitrate, gallium chloride, indium nitrate, indium chloride, tin chloride, stannous chloride, lead nitrate, cerium nitrate, iron nitrate, cobalt nitrate, nickel nitrate, manganese nitrate, cadmium nitrate, silver nitrate, zinc nitrate, bismuth nitrate, copper nitrate, palladium nitrate, aluminum nitrate and samarium nitrate.

[0010] The molar fraction of each metal precursor salt in the mixed metal precursor solution is 15% to 42%.

[0011] Optionally, the amine compound is selected from at least one of melamine, urea, biuret, acetyl guanidine and benzene melamine.

[0012] The aldehyde compound is selected from at least one of formaldehyde, acetaldehyde, propyl aldehyde, ethanedial, propanedial and pentanedial.

[0013] Optionally, in step 3, the flow ratio of Ar to H2 is 1:1.

[0014] The annealing time of the annealing is 1 to 4 hours.

[0015] Optionally, in steps 1 and 2, the solvent is selected from at least one of water, methanol and ethanol.

[0016] Optionally, in step 1, the reaction is a stirring reaction at 40 to 80℃.

[0017] Optionally, in steps 1 and 2, the drying is oven drying or freeze drying.

[0018] The oven drying condition is 80 to 150℃ for 12 to 24 hours.

[0019] The freeze drying temperature is -60 to -40℃ for 12 to 24 hours.

[0020] Optionally, in step 2, the Schiff base reaction is a condensation reflux reaction at 40 to 80℃.

[0021] A high-entropy alloy is prepared by the method for preparing a high-entropy alloy by synergistic reduction of carbon and hydrogen according to any one of the present application.

[0022] The high-entropy alloy according to the present application is used for preparing a wide-temperature-range strain material.

[0023] The high-entropy alloy according to the present application is used for preparing a wide-temperature-range strain sensor.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] Compared with the traditional method, the method greatly reduces the preparation temperature from the extremely high temperature range of the traditional process to the medium temperature range, not only significantly reduces the energy consumption and production cost, but also effectively solves the problems of element volatilization and composition segregation caused by high temperature, greatly improves the alloy composition control precision. In addition, the method can realize the controllable and uniform doping of interstitial atoms (C atoms), accurately control the microstructure of the material at the atomic scale, and the prepared high-entropy alloy exhibits more excellent comprehensive performance: on the one hand, the in-situ generated nanocarbide phase significantly improves the high-temperature stability of the material; on the other hand, the uniformly distributed interstitial atoms effectively inhibit the dislocation movement, and the alloy can still maintain the structural integrity at high temperature. This preparation method not only avoids the formation of ordered brittle phase commonly seen in traditional methods, but also provides a new technical path for the development of new high-entropy alloy materials with special functional characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and together with the specific embodiments below, serve to explain the application, but do not constitute a limitation on the application. In the drawings:

[0027] Figure 1 SEM image of MoWNbGaIn high-entropy alloy prepared for Example 1;

[0028] Figure 2 EDS image of MoWNbGaIn nanometer high-entropy alloy prepared for Example 1;

[0029] Figure 3 XRD image of MoWNbGaIn nanometer high-entropy alloy prepared for Example 1;

[0030] Figure 4 XRD image of MoWNbGaIn alloy prepared for Comparative Example 1;

[0031] Figure 5 XRD image of MoWNbGaIn alloy prepared for Comparative Example 2;

[0032] Figure 6 SEM image of MoWNbGaIn / MoWNbGaInC blended high-entropy alloy prepared for Example 2;

[0033] Figure 7 EDS image of MoWNbGaIn / MoWNbGaInC blended high-entropy alloy prepared for Example 2;

[0034] Figure 8 XRD image of MoWNbGaIn / MoWNbGaInC blended high-entropy alloy prepared for Example 2;

[0035] Figure 9 SEM image of MoWNbGaInC high-entropy alloy prepared in Example 3;

[0036] Figure 10 EDS image of MoWNbGaInC high-entropy alloy prepared in Example 3;

[0037] Figure 11 XRD image of MoWNbGaInC high-entropy alloy prepared in Example 3;

[0038] Figure 12 High-temperature stability image of MoWNbGaInC high-entropy alloy prepared in Example 3; DETAILED DESCRIPTION

[0039] In order to further understand the present application, the present application is described below in conjunction with examples, which are only further explanations of features and advantages of the present application, and are not used to limit the claims of the present application.

[0040] The method for preparing high-entropy alloy by carbon-hydrogen synergistic reduction of the present application comprises:

[0041] Step 1, dissolving metal precursor salts in a solvent to prepare a metal precursor mixed solution, obtaining a metal precursor homogeneous solution after reaction, and obtaining a metal precursor powder after drying;

[0042] Step 2, dispersing amine compounds and aldehyde compounds in a solvent to obtain a carbon precursor solution by Schiff base reaction, and obtaining a carbon precursor powder after drying;

[0043] Step 3, mixing the carbon precursor powder and the metal precursor powder according to a mass ratio of 1:(1-10), and annealing at 800-1100℃ under Ar / H2 atmosphere to form a nano-refractory high-entropy alloy;

[0044] The metal precursor salts are selected from at least five of ammonium molybdate, ammonium tungstate, ammonium niobate, niobium oxalate, ammonium niobate oxalate hydrate, molybdenum hexacarbonyl, tungsten hexacarbonyl, tantalum ethoxide, tantalum chloride, gallium nitrate, gallium chloride, indium nitrate, indium chloride, tin chloride, stannous chloride, lead nitrate, cerium nitrate, iron nitrate, cobalt nitrate, nickel nitrate, manganese nitrate, cadmium nitrate, silver nitrate, zinc nitrate, bismuth nitrate, copper nitrate, palladium nitrate, aluminum nitrate and samarium nitrate.

[0045] The mole fraction of each metal precursor salt in the metal precursor mixed solution is 15%-42%.

[0046] The amine compounds are selected from at least one of melamine, urea, biuret, acetyl guanidine and benzene melamine; and the aldehyde compounds are selected from at least one of formaldehyde, acetaldehyde, propyl aldehyde, glyoxal, malonaldehyde and glutaraldehyde.

[0047] Specifically comprising the following processes:

[0048] Step 1, taking the metal precursor salt dissolved in the solvent to prepare a metal precursor mixed solution;

[0049] Step 2, the metal precursor mixed solution is reacted to obtain a metal precursor homogeneous solution;

[0050] Step 3, the metal precursor homogeneous solution is dried to obtain a dried metal precursor powder;

[0051] Step 4, melamine and glyoxal are dispersed in a solvent, and 80℃ condensation reflux is carried out to obtain a carbon precursor solution;

[0052] Step 5, the carbon precursor solution is dried to obtain a dried carbon precursor powder;

[0053] Step 6, the carbon precursor powder and the metal precursor powder are annealed at 800-1100℃ under Ar / H2 atmosphere in a certain proportion to form a nano-refractory high-entropy alloy;

[0054] The method of the present application can realize the preparation of a nano-refractory high-entropy alloy at a lower temperature by mixing and reacting a plurality of metal salts in a solvent to form a homogeneous metal salt mixed solution, and by virtue of the surface reduction ability of hydrogen and the deep reduction ability of carbon. In addition, this method can realize in-situ interstitial atom doping without the need for further doping by other methods. The present application provides a method for preparing a nano-refractory high-entropy alloy.

[0055] The metal precursor salt is selected from at least five of ammonium molybdate, ammonium tungstate, ammonium niobate, niobium oxalate, ammonium niobate oxalate hydrate, molybdenum hexacarbonyl, tungsten hexacarbonyl, tantalum ethoxide, tantalum chloride, gallium nitrate, gallium chloride, indium nitrate, indium chloride, tin chloride, stannous chloride, lead nitrate, cerium nitrate, iron nitrate, cobalt nitrate, nickel nitrate, manganese nitrate, cadmium nitrate, silver nitrate, zinc nitrate, bismuth nitrate, copper nitrate, palladium nitrate, aluminum nitrate and samarium nitrate.

[0056] The flow ratio of Ar to H2 is 1:1.

[0057] In step 1, the solvent is selected from at least one of deionized water, methanol and ethanol.

[0058] In step 1, the molar fraction of each metal precursor salt is 15%-42%.

[0059] In step 2, the reaction is a stirring reaction at 40-80℃.

[0060] In step 3, the drying is oven drying or freeze drying; the oven drying condition is 80-150 DEG C, and the time is 12-24 h; the freeze drying temperature is -60 DEG C to -40 DEG C, and the time is 12-24 h.

[0061] In step 4, the solvent is at least one of deionized water, methanol and ethanol.

[0062] In step 4, the reaction is condensation reflux at 40-80 DEG C.

[0063] In step 5, the drying is oven drying or freeze drying; the oven drying condition is 80-150 DEG C, and the time is 12-24 h; the freeze drying temperature is -60 DEG C to -40 DEG C, and the time is 12-24 h.

[0064] In step 6, the annealing time is 1-4 h.

[0065] The nano high-entropy alloy obtained by the preparation method.

[0066] Experiments prove that the nano high-entropy alloy material prepared by the application has a fast and sensitive response to strain in a wide temperature range of -190 DEG C to 1000 DEG C, which proves the application potential of the material in extreme environment sensing, so that the nano high-entropy alloy of the application is used for preparing a wide temperature range strain material.

[0067] Example 1:

[0068] In step 1, 0.02 mmol of ammonium molybdate, ammonium tungstate, 0.2 mmol of ammonium niobate oxalate hydrate, 0.1 mmol of anhydrous gallium chloride and anhydrous indium chloride are respectively dissolved in deionized water at 25 DEG C to prepare a metal salt reaction solution;

[0069] In step 2, the metal salt reaction solution is reacted at 25 DEG C for 2 h, and then reacted at 60 DEG C for 2 h to become a metal precursor homogeneous solution;

[0070] In step 3, the metal precursor homogeneous solution after complete reaction is dried at 80 DEG C to remove excess solvent, and the time is 12 h;

[0071] In step 4, the melamine and glyoxal are dispersed in anhydrous ethanol at a ratio of 1:1, and are condensed and refluxed at 80 DEG C for 2 h to obtain a carbon precursor solution;

[0072] In step 5, the carbon precursor solution is dried at 80 DEG C to remove the solvent, and the time is 12 h to obtain a dried carbon precursor powder;

[0073] Step 6, carbon precursor powder and metal precursor powder were annealed at 800℃ under Ar / H2 atmosphere at a ratio of 1:5 to obtain MoWNbGaIn high-entropy alloy;

[0074] The SEM image of MoWNbGaIn alloy obtained by the embodiment 1 of the present application is shown in Figure 1 From Figure 1 it can be seen that the microstructure of MoWNbGaIn high-entropy alloy presents a nanoparticle structure, and the corresponding EDS image is shown in Figure 2 The element distribution map shows the uniform distribution of Mo, W, Nb, Ga and In on the surface of the material (see Figure 2 Fig. a, b, c, d and e, respectively), which confirms the existence of the five metal elements; the XRD image of the synthesized MoWNbGaIn high-entropy alloy is shown in Figure 3 From Figure 3 it can be seen that the synthesized substance is a single body-centered cubic structure, and there is no other oxide phase and intermetallic compound phase, which indicates that the MoWNbGaIn high-entropy alloy with single-phase structure is successfully synthesized.

[0075] Comparative Example 1:

[0076] Step 1, 0.02 mmol of ammonium molybdate heptahydrate, ammonium tungstate, 0.2 mmol of ammonium niobate oxalate hydrate, 0.1 mmol of anhydrous gallium chloride and anhydrous indium chloride were respectively dissolved in deionized water at 25℃ to prepare a metal salt reaction solution;

[0077] Step 2, the metal salt reaction solution was reacted at 25℃ for 2h, and then continued to react at 60℃ for 2h to form a metal precursor homogeneous solution;

[0078] Step 3, the metal precursor homogeneous solution after complete reaction was dried at 80℃ for 12h to remove excess solvent;

[0079] Step 4, the metal precursor powder was annealed at 800℃ under Ar / H2 atmosphere to obtain the material.

[0080] The XRD image of the material obtained in Comparative Example 1 is shown in Figure 4 The results show that the synthesized material has phase separation, in addition to the metal phase, there are oxide (NbO2, PDF#74-2387) and intermetallic compound phase (GaMo3, PDF#42-0112), and under the influence of not adding carbon precursor, single-phase alloy is not generated under this condition.

[0081] Comparative Example 2:

[0082] Step 1, 0.02 mmol of ammonium molybdate, ammonium tungstate, 0.2 mmol of ammonium niobate oxalate hydrate, 0.1 mmol of anhydrous gallium chloride and anhydrous indium chloride were respectively dissolved in deionized water at 25 °C to prepare a metal salt reaction solution;

[0083] Step 2, the metal salt reaction solution was reacted at 25 °C for 2 h, and then continued to react at 60 °C for 2 h to form a metal precursor homogeneous solution;

[0084] Step 3, the metal precursor homogeneous solution after complete reaction was dried at 80 °C for 12 h to remove excess solvent;

[0085] Step 4, melamine and glyoxal were dispersed in anhydrous ethanol at a ratio of 1:1, and condensed and refluxed at 80 °C for 2 h to obtain a carbon precursor solution;

[0086] Step 5, the carbon precursor solution was dried at 80 °C for 12 h to remove the solvent, and a dried carbon precursor powder was obtained;

[0087] Step 6, the carbon precursor powder and the metal precursor powder were annealed at 800 °C under Ar atmosphere at a ratio of 1:5.

[0088] The XRD pattern of the material obtained in Comparative Example 2 is shown in Figure 5 The results show that there is phase separation, corresponding to MoO2 (PDF #32-0671), InW3O9 (PDF #33-0627) and Nb2W3O 14 (PDF #25-1357), and no single-phase alloy is generated under the condition of no added hydrogen.

[0089] Example 2:

[0090] Step 1, 0.02 mmol of ammonium molybdate, ammonium tungstate, 0.2 mmol of ammonium niobate oxalate hydrate, 0.1 mmol of anhydrous gallium chloride and anhydrous indium chloride were respectively dissolved in deionized water at 25 °C to prepare a metal salt reaction solution;

[0091] Step 2, the metal salt reaction solution was reacted at 25 °C for 2 h, and then continued to react at 60 °C for 2 h to form a metal precursor homogeneous solution;

[0092] Step 3, the metal precursor homogeneous solution after complete reaction was dried at 80 °C for 12 h to remove excess solvent;

[0093] Step 4, melamine and glyoxal were dispersed in anhydrous ethanol at a ratio of 1:1, and condensed and refluxed at 80 °C for 2 h to obtain a carbon precursor solution;

[0094] Step 5: Dry the carbon precursor solution at 80°C for 12 hours to remove the solvent, and obtain the dried carbon precursor powder.

[0095] Step 6: The carbon precursor powder and the metal precursor powder are annealed at 800°C in an Ar / H2 atmosphere at a ratio of 1:1 to obtain a high-entropy alloy of MoWNbGaIn and MoWNbGaInC blended phases.

[0096] The SEM image of the MoWNbGaIn and MoWNbGaInC co-alloy obtained in Example 2 of this invention is shown below. Figure 6 As shown, from Figure 6 It can be seen that the microstructure of this blended high-entropy alloy exhibits a nanoparticle structure, as shown in the corresponding EDS diagram. Figure 7 As shown, the elemental distribution diagram displays the uniform distribution of five metallic elements—Mo, W, Nb, Ga, and In—on the surface of this material, and also shows a uniform distribution of C (see [references]). Figure 7 Figures a, b, c, d, e, and f in the diagram confirm the presence of five metallic elements and element C; the XRD pattern of the synthesized blended high-entropy alloy is shown in Figure [image missing]. Figure 8 As shown, from Figure 8 It can be seen that the synthesized material has a body-centered cubic structure of MoWNbGaIn and a close-packed hexagonal structure of MoWWNbGaInC. There are no other oxide phases or intermetallic compound phases, indicating that a high-entropy alloy of MoWNbGaIn / MoWNbGaInC with a blended phase structure has been successfully synthesized.

[0097] Example 3:

[0098] Step 1: Dissolve 0.02 mmol of ammonium molybdate heptahydrate, ammonium tungstate, 0.2 mmol of ammonium niobate oxalate hydrate, 0.1 mmol of anhydrous gallium chloride and anhydrous indium chloride in deionized water at 25°C to prepare metal salt reaction solutions.

[0099] Step 2: After the metal salt reaction solution reacts at 25°C for 2 hours, it continues to react at 60°C for 2 hours to make it a homogeneous solution of metal precursor.

[0100] Step 3: After complete reaction, the homogeneous solution of the metal precursor is dried at 80°C to remove excess solvent for 12 hours.

[0101] Step 4: Disperse melamine and glyoxal in anhydrous ethanol at a ratio of 1:1, reflux at 80°C for 2 hours to obtain a carbon precursor solution.

[0102] Step 5, dry the carbon precursor solution at 80℃ for 12h to remove the solvent, and obtain the dried carbon precursor powder;

[0103] Step 6, anneal the carbon precursor powder and the metal precursor powder at 800℃ under Ar / H2 atmosphere with a ratio of 5:1, and obtain the gap C-doped MoWNbGaIn high-entropy alloy.

[0104] The SEM image of the gap C-doped MoWNbGaInC alloy obtained in Example 3 is shown in Figure 9 From Figure 9 it can be seen that the microstructure of the MoWNbGaIn high-entropy alloy presents a nanoparticle structure, and the corresponding EDS image is shown in Figure 10 The element distribution map shows that the six elements of Mo, W, Nb, Ga, In and C are uniformly distributed on the surface of the material (see Figures a, b, c, d, e and f in Figure 10 respectively), which confirms the existence of the six elements; the XRD image of the synthesized MoWNbGaInC high-entropy alloy is shown in Figure 11 From Figure 11 it can be seen that the synthesized substance is a single hexagonal close-packed structure, and there is no other oxide phase and intermetallic compound phase, which indicates that the single-phase MoWNbGaInC high-entropy alloy is successfully synthesized.

[0105] Referring to Figure 12 , the high-temperature sensing stability test of the MoWNbGaInC nano high-entropy alloy of Example 3 was carried out, which specifically included the temperature sensing stability at 1600℃, and the results showed that the material could still maintain excellent sensing performance and stability at an ultra-high temperature of 1600℃, which confirmed the application potential of the material in extreme environment sensing.

[0106] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing high-entropy alloys by hydrocarbon synergistic reduction, characterized in that, include: Step 1: Dissolve the metal precursor salt in a solvent to prepare a mixed solution of metal precursors. After the reaction, a homogeneous solution of metal precursors is obtained. After drying, metal precursor powder is obtained. Step 2: Amine compounds and aldehyde compounds are dispersed in a solvent and undergo a Schiff base reaction to obtain a carbon precursor solution, which is then dried to obtain a carbon precursor powder. Step 3: The carbon precursor powder and the metal precursor powder are mixed at a mass ratio of 1:(1~10) and then annealed at 800~1100℃ in an Ar / H2 atmosphere to form a nano-refractory high-entropy alloy. The metal precursor salt is selected from at least five of the following: ammonium molybdate, ammonium tungstate, ammonium niobate, niobate oxalate, ammonium niobate oxalate hydrate, molybdenum hexacarbonyl, tungsten hexacarbonyl, tantalum ethoxide, tantalum chloride, gallium nitrate, gallium chloride, indium nitrate, indium chloride, tin chloride, stannous chloride, lead nitrate, cerium nitrate, iron nitrate, cobalt nitrate, nickel nitrate, manganese nitrate, cadmium nitrate, silver nitrate, zinc nitrate, bismuth nitrate, copper nitrate, palladium nitrate, aluminum nitrate, and samarium nitrate. The molar fraction of each metal precursor salt in the mixed metal precursor solution is 15% to 42%.

2. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1, characterized in that, In step 1, the amine compound is selected from at least one of melamine, urea, biuret, acetylguanidine, and benzomelamine; Aldehydes are selected from at least one of formaldehyde, acetaldehyde, propionaldehyde, glyoxal, malondialdehyde, and glutaraldehyde.

3. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1 or 2, characterized in that, In step 3, the flow rate ratio of Ar to H2 is 1:1; The annealing time is 1 to 4 hours.

4. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1 or 2, characterized in that, In steps 1 and 2, the solvents are selected from at least one of water, methanol, and ethanol.

5. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1 or 2, characterized in that, In step 1, the reaction is carried out by stirring at 40–80°C.

6. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1 or 2, characterized in that, In steps 1 and 2, the drying process involves either oven drying or freeze drying. The drying conditions are 80–150℃ for 12–24 hours; The freeze-drying temperature is -60℃ to -40℃, and the time is 12 to 24 hours.

7. The method for preparing high-entropy alloys by hydrocarbon synergistic reduction according to claim 1 or 2, characterized in that, In step 2, the Schiff base reaction is carried out by reflux condensation at 40–80°C.

8. A high-entropy alloy, characterized in that, The high-entropy alloy is prepared by the method for preparing high-entropy alloy by hydrocarbon synergistic reduction as described in any one of claims 1-7.

9. The application of the high-entropy alloy of claim 8 in the preparation of wide-temperature-range materials.

10. The application of the high-entropy alloy of claim 8 in the fabrication of a wide-temperature-range temperature sensor.

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