Multi-element high-entropy alloy material, preparation method thereof and harmonic reducer

Abstract

The invention discloses a multi-element high-entropy alloy material, a preparation method thereof and a harmonic reducer, and relates to the technical field of metal materials. The multi-element high-entropy alloy material comprises the following components in atomic percent: 8%-16% of Al, 10%-16% of Cr, 15%-30% of Fe, 15%-20% of Ni, 10%-16% of V, 5%-16% of Cu, 1%-3% of Si, 1%-3% of Ti, 1%-3% of Pd and 1%-3% of B. The multi-element high-entropy alloy material prepared from the components has high strength, hardness and corrosion resistance, and is suitable for preparing a flexible gear of a harmonic reducer.

Description

Technical Field

[0001] This invention relates to the field of metallic materials technology, and more specifically, to a multi-element high-entropy alloy material, its preparation method, and a harmonic reducer. Background Technology

[0002] A harmonic reducer is a gear transmission device that uses a wave generator fitted with a flexible bearing to cause a flexure to undergo controllable elastic deformation, which meshes with a rigid wheel to transmit motion and power. The flexure is the core component of the harmonic reducer. It operates at high speeds for extended periods, endures alternating loads, and is prone to corrosion and rust in humid, high-humidity, and chemically exposed environments, leading to a short lifespan and reduced accuracy.

[0003] Existing technologies mostly use alloy steel or stainless steel to prepare flexible wheels, but their hardness and corrosion resistance are insufficient. High-entropy alloys, due to their "cocktail effect," can overcome the performance bottlenecks of traditional alloys and achieve comprehensive synergy of multiple properties, providing a choice for the preparation of current flexible wheel materials. However, current high-entropy alloys cannot effectively combine high strength, hardness, and corrosion resistance, thus limiting their applicability.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-element high-entropy alloy material, its preparation method, and a harmonic reducer. This multi-element high-entropy alloy material has high strength, hardness, and corrosion resistance, and can be better suited for the preparation of flexible gears in harmonic reducers.

[0006] This invention is implemented as follows: In a first aspect, the present invention provides a multi-component high-entropy alloy material, wherein the atomic percentages of each component of the multi-component high-entropy alloy material are Al 8%-16%, Cr 10%-16%, Fe 15%-30%, Ni 15%-20%, V 10%-16%, Cu 5%-16%, Si 1%-3%, Ti 1%-3%, Pd 1%-3%, and B 1%-3%.

[0007] In an optional embodiment, the atomic ratio of Al:Cr:Fe:Ni:V:Cu is 1:1:1:1:1:1, and the atomic percentages of Si, Ti, Pd, and B are 2% to 3%, respectively.

[0008] In an optional embodiment, the atomic percentages of each component of the multi-element high-entropy alloy material are Al 15%, Cr 15%, Fe 15%, Ni 15%, V 15%, Cu 15%, Si 2%, Ti 2%, Pd 3%, and B 3%.

[0009] In a second aspect, the present invention provides a method for preparing a multi-element high-entropy alloy material as described in any of the foregoing embodiments, comprising: The metal raw materials of the components are pretreated and proportioned according to atomic percentage; smelted into ingots, the ingots are cut into billets and then subjected to solution treatment, aging treatment and post-treatment, and then shaped.

[0010] In an optional implementation, the melting process includes heating the material with electricity, followed by cooling it to a solid state as a melting process, which is repeated 3-5 times.

[0011] In an optional embodiment, the current for the electric heating and melting is 200-300 A, the melting time is 3-5 minutes, and the cooling rate is 50-100℃ / s.

[0012] In an optional embodiment, the melting is carried out in a vacuum arc melting furnace, and the vacuum arc melting furnace is evacuated to 4×10⁻⁶ before melting. -3 -6×10 -3 Pa, then argon gas was introduced to 0.04-0.06 MPa.

[0013] In an optional embodiment, the solution treatment includes placing the billet in a vacuum heat treatment furnace and holding it at 1000-1100°C for 1-3 hours, followed by water quenching at a cooling rate ≥200°C / s.

[0014] In an optional implementation, the aging process includes first holding the product at 500-700°C for 5-7 hours, followed by air cooling to room temperature.

[0015] Thirdly, the present invention provides a harmonic reducer, which includes a flexible wheel, the flexible wheel being made of a multi-element high-entropy alloy material as described in any of the foregoing embodiments or a multi-element high-entropy alloy material prepared by a method described in any of the foregoing embodiments.

[0016] The present invention has the following beneficial effects: The multi-element high-entropy alloy material provided by this invention uses six elements—Al, Cr, Fe, Ni, V, and Cu—as the main elements, and adds Si, Ti, Pd, and B to form a multi-element high-entropy alloy material with high strength, hardness, and corrosion resistance. Specifically, Al and Ti promote the BCC phase, Ni and Fe stabilize the FCC phase, and Si and B refine grain boundaries, improving strength and plasticity. Cr, Al, and Ti form a dense passivation film, enhancing corrosion resistance. Al and Cr can jointly form a Cr2O3 / Al2O3-rich composite oxide layer, reducing the oxidation rate; they can also alter the distribution morphology of Cr and Ti, promoting the formation of a Cr-rich passivation film. Pd has significantly different atomic sizes and electronegativity from other constituent elements (such as Al and Cr). Adding the noble metal element Pd can appropriately improve the solid solution strengthening effect and can also form an antioxidant Pd-Si compound, increasing surface hardness. The multi-element high-entropy alloy material prepared using the above components possesses high strength, hardness, and corrosion resistance, making it suitable for manufacturing flexible wheels for harmonic reducers. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0018] This invention provides a multi-component high-entropy alloy material, wherein the atomic percentages of each component are Al 8%-16%, Cr 10%-16%, Fe 15%-30%, Ni 15%-20%, V 10%-16%, Cu 5%-16%, Si 1%-3%, Ti 1%-3%, Pd 1%-3%, and B 1%-3%.

[0019] This invention utilizes six main elements—Al, Cr, Fe, Ni, V, and Cu—with the addition of Si, Ti, Pd, and B to create a multi-element high-entropy alloy material possessing high strength, hardness, and corrosion resistance. Specifically, Al and Ti promote the BCC phase, Ni and Fe stabilize the FCC phase, Si and B refine grain boundaries, enhancing strength and plasticity; and the addition of appropriate amounts of Cu improves corrosion resistance. Cr, Al, and Ti form a dense passivation film, further improving corrosion resistance. Al and Cr can jointly form a Cr₂O₃ / Al₂O₃-rich composite oxide layer, reducing the oxidation rate; they can also alter the distribution of Cr and Ti, promoting the formation of a Cr-rich passivation film. Pd has significantly different atomic sizes and electronegativity from other constituent elements (such as Al and Cr). The addition of the noble metal Pd can appropriately improve the solid solution strengthening effect and can also form an antioxidant Pd-Si compound, increasing surface hardness. V primarily plays a role in solid solution strengthening and secondary phase strengthening, and its oxide V₂O₅ may also contribute to the passivation film.

[0020] In the multi-element high-entropy alloy material of this invention, the atomic ratio of Al:Cr:Fe:Ni:V:Cu is 1:1:1:1:1:1, and the atomic percentages of Si, Ti, Pd, and B are 2% to 3%, respectively.

[0021] Preferably, the multi-component high-entropy alloy material of the present invention comprises, by atomic percentage, 15% Al, 15% Cr, 15% Fe, 15% Ni, 15% V, 15% Cu, 2% Si, 2% Ti, 3% Pd, and 3% B. By optimizing the content of the above components, the performance of the multi-component high-entropy alloy material can be further improved.

[0022] Furthermore, the present invention provides a method for preparing the above-mentioned multi-element high-entropy alloy material, comprising: S1. Pre-treat the metal raw materials of the components and proportion them according to atomic percentage.

[0023] Weigh high-purity (≥99.9%) Al, Cr, Fe, Ni, V, Cu, Si, Ti, Pd, and B metal raw materials according to atomic percentage, precisely controlling the composition as follows: Al 8%-16%, Cr 10%-16%, Fe 15%-30%, Ni 15%-20%, V 10%-16%, Cu 5%-16%, Si 1%-3%, Ti 1%-3%, Pd 1%-3%, and B 1%-3%. Surface cleaning is then performed to remove oxides and impurities.

[0024] S2, smelted into ingots.

[0025] The mixed raw materials were placed in a water-cooled copper crucible and melted in a vacuum arc melting furnace. Before melting, the furnace chamber was evacuated to a vacuum level of 4 × 10⁻⁶.-3 -6×10 -3 Pa, then high-purity argon gas (99.999% purity) was introduced to 0.04-0.06 MPa.

[0026] The melting process involves heating with electricity and then cooling to a solid state, and this process is repeated 3-5 times. During each melting process, the current for heating is 200-300 A, the melting time is 3-5 minutes, and the cooling rate is 50-100℃ / s. This rapid solidification refines the grains and reduces segregation.

[0027] In this invention, melting is carried out in a vacuum arc melting furnace. Current flows through the vacuum arc (arc discharge heat generation) between the electrodes and the metal raw material, reaching temperatures exceeding 3000℃. The strong arc stirring effect reduces component segregation. Furthermore, melting is conducted in a vacuum environment, isolating oxygen and preventing component oxidation. This invention allows for precise temperature control during melting to achieve stable melting, while controlling the melting time ensures it matches the current, maximizing its effect to eliminate component inhomogeneity in multi-component alloys and promoting component homogenization. Since melting in this application requires multiple repetitions, precise time control is necessary for each iteration. Controlling the cooling rate regulates the microstructure, thereby optimizing performance. This invention employs a cooling rate of 50-100℃ / s, which shortens the melt solidification time, suppresses long-distance diffusion of component atoms, reduces dendrite segregation and coarse equiaxed crystals, and forms finer, more uniform equiaxed or columnar crystal structures, thus providing higher strength. The phase stability of high-entropy alloys is sensitive to the cooling rate. Slow cooling easily leads to the precipitation of brittle intermetallic compounds, while rapid cooling can suppress the precipitation of compounds and retain a single FCC / BCC solid solution phase. The solid solution phase is more likely to have both strength and toughness.

[0028] S3. After the ingot is cut into billets, it undergoes solution treatment, aging treatment and post-treatment, and then is shaped.

[0029] The solution treatment involves placing the billet in a vacuum heat treatment furnace and holding it at 1000-1100℃ for 1-3 hours, followed by water quenching at a cooling rate ≥200℃ / s. The solution-treated material then undergoes aging treatment, first holding it at 500-700℃ for 5-7 hours, followed by air cooling to room temperature. Post-treatment includes 3D printing the aged alloy billet into the desired shape of the flexible wheel, and further optimizing its corrosion resistance through surface polishing or passivation.

[0030] In this invention, specific solution treatment and aging treatment can be used to regulate the microstructure of the material, thereby achieving component homogenization and enhancing material properties. In particular, water quenching after holding at 1050℃ can fix the high-temperature structure and suppress the formation of coarse phases. Air cooling after holding at 600℃ forms AlTi3 nano-precipitates and MoCo2 intermetallic compounds, which can significantly improve the strength and hardness of the alloy.

[0031] The multi-element high-entropy alloy material prepared by the above-mentioned method has good strength, hardness and corrosion resistance, and can be used to prepare the flexible wheel of the harmonic reducer.

[0032] In response, the present invention provides a harmonic reducer, which includes a flexible wheel, the flexible wheel being made of the aforementioned multi-element high-entropy alloy material or the multi-element high-entropy alloy material prepared by the aforementioned method.

[0033] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0034] Example 1 This embodiment provides a composition of (AlCrFeNiVCu). 15 Si2Ti2Pd3B3 multi-element high-entropy alloy material.

[0035] Its preparation methods include: S1. Raw material pretreatment and proportioning: Weigh high-purity (≥99.9%) Al, Cr, Fe, Ni, V, Cu, Si, Ti, Pd, and B metal raw materials according to atomic percentage, and precisely control the composition as Al 15%, Cr 15%, Fe 15%, Ni 15%, V 15%, Cu 15%, Si 2%, Ti 2%, Pd 3%, and B 3%, and perform surface cleaning to remove oxides and impurities.

[0036] S2. Vacuum Arc Melting: The mixed raw materials are placed in a water-cooled copper crucible and melted in a vacuum arc melting furnace. Before melting, the furnace cavity is evacuated to a vacuum level of 5 × 10⁻⁶. -3 The pressure was initially set to 0.05 MPa, then high-purity argon (99.999% purity) was introduced. The melting process, consisting of electric heating followed by cooling to a solid state, was repeated four times. During each melting process, the electric heating current was 250 A, the melting time was 4 minutes, and the cooling rate was 80 °C / s, utilizing rapid solidification to refine the grains and reduce segregation.

[0037] S3. Solution treatment: After the ingot is cut into billets, it is placed in a vacuum heat treatment furnace and held at 1050℃ for 2 hours, followed by water quenching (cooling rate ≥200℃ / s).

[0038] S4. Aging treatment: The solution-treated material undergoes a two-stage aging strengthening process. First, it is held at 600℃ for 6 hours, followed by air cooling to room temperature.

[0039] S5. Post-processing and forming: The aged alloy billet is 3D printed into the shape required for the flexible wheel, and its corrosion resistance is further optimized by surface polishing or passivation.

[0040] Example 2 This embodiment provides a composition of (AlCrFeNiVCu). 16 The high-entropy alloy of SiTiPdB is prepared using the same method as in Example 1.

[0041] Example 3 This embodiment provides a composition of Al8Cr 10 Fe 30 Ni 20 V 10 Cu 10 The high-entropy alloy of Si3Ti3Pd3B3 is prepared using the same method as in Example 1.

[0042] Example 4 This embodiment provides a component of Al 11 Cr 12 Fe 22 Ni 18 V 12 Cu 15 The high-entropy alloy of Si3Ti3Pd2B2 is prepared using the same method as in Example 1.

[0043] Example 5 The components in this embodiment are the same as those in Example 1, but the preparation method is different. This embodiment includes the following steps: S1. Raw material pretreatment and proportioning: Weigh high-purity (≥99.9%) Al, Cr, Fe, Ni, V, Cu, Si, Ti, Pd, and B metal raw materials according to atomic percentage, and precisely control the composition as Al 15%, Cr 15%, Fe 15%, Ni 15%, V 15%, Cu 15%, Si 2%, Ti 2%, Pd 3%, and B 3%, and perform surface cleaning to remove oxides and impurities.

[0044] S2. Vacuum Arc Melting: The mixed raw materials are placed in a water-cooled copper crucible and melted in a vacuum arc melting furnace. Before melting, the furnace cavity is evacuated to a vacuum level of 4×10⁻⁶. -3The pressure was initially set to 0.04 MPa, then high-purity argon (99.999% purity) was introduced. The melting process, consisting of electric heating followed by cooling to a solid state, was repeated three times. During each melting process, the electric heating current was 200 A, the melting time was 5 minutes, and the cooling rate was 50 °C / s, utilizing rapid solidification to refine the grains and reduce segregation.

[0045] S3. Solution treatment: After the ingot is cut into billets, it is placed in a vacuum heat treatment furnace and held at 1000℃ for 3 hours, followed by water quenching (cooling rate ≥200℃ / s).

[0046] S4. Aging treatment: The solution-treated material undergoes a two-stage aging strengthening process. First, it is held at 500℃ for 7 hours, followed by air cooling to room temperature.

[0047] S5. Post-processing and forming: The aged alloy billet is 3D printed into the shape required for the flexible wheel, and its corrosion resistance is further optimized by surface polishing or passivation.

[0048] Example 6 The components in this embodiment are the same as those in Example 1, but the preparation method is different. This embodiment includes the following steps: S1. Raw material pretreatment and proportioning: Weigh high-purity (≥99.9%) Al, Cr, Fe, Ni, V, Cu, Si, Ti, Pd, and B metal raw materials according to atomic percentage, and precisely control the composition as Al 15%, Cr 15%, Fe 15%, Ni 15%, V 15%, Cu 15%, Si 2%, Ti 2%, Pd 3%, and B 3%, and perform surface cleaning to remove oxides and impurities.

[0049] S2. Vacuum Arc Melting: The mixed raw materials are placed in a water-cooled copper crucible and melted in a vacuum arc melting furnace. Before melting, the furnace cavity is evacuated to a vacuum level of 6×10⁻⁶. -3 The pressure was initially set at 0.06 MPa, then high-purity argon (99.999% purity) was introduced to achieve a pressure of 0.06 MPa. A melting process was performed by heating with electricity, followed by cooling to a solid state, repeated five times. During each melting process, the heating current was 300 A, the melting time was 3 minutes, and the cooling rate was 100 °C / s, utilizing rapid solidification to refine the grains and reduce segregation.

[0050] S3. Solution treatment: After the ingot is cut into billets, it is placed in a vacuum heat treatment furnace and held at 1100℃ for 1 hour, followed by water quenching (cooling rate ≥200℃ / s).

[0051] S4. Aging treatment: The solution-treated material undergoes a two-stage aging strengthening process. First, it is held at 700℃ for 5 hours, followed by air cooling to room temperature.

[0052] S5. Post-processing and forming: The aged alloy billet is 3D printed into the shape required for the flexible wheel, and its corrosion resistance is further optimized by surface polishing or passivation.

[0053] Example 7 The components in this embodiment are the same as those in Example 1, but the parameters of the solution treatment in the preparation method are different: the solution treatment temperature is 900℃, and the rest are the same as in Example 1.

[0054] Example 8 The components in this embodiment are the same as those in Example 1, but the aging treatment parameters in the preparation method are different: aging temperature 400℃, 3 h.

[0055] Comparative Example 1 This comparative example provides a high-entropy alloy with a composition of CrFeNiCuV, and its preparation method is consistent with that of Example 1.

[0056] Comparative Example 2 This comparative example provides a high-entropy alloy with a composition of AlCrFeNiCu, and its preparation method is consistent with that of Example 1.

[0057] Comparative Example 3 This comparative example provides a high-entropy alloy with a composition of CrFeNiCuCo, and its preparation method is consistent with that of Example 1.

[0058] Comparative Example 4 This comparative example provides a high-entropy alloy with a composition of CrFeNiCuMn, and its preparation method is consistent with that of Example 1.

[0059] Comparative Example 5 This comparative example provides a high-entropy alloy with the composition AlCrFeNiVCu, and its preparation method is consistent with that of Example 1.

[0060] Comparative Example 6 This comparative example provides a high-entropy alloy with the composition AlCrFeNiVCuSi, and its preparation method is consistent with that of Example 1.

[0061] Comparative Example 7 This comparative example provides a high-entropy alloy with the composition AlCrFeNiVCuTi, and its preparation method is consistent with that of Example 1.

[0062] Comparative Example 8 This comparative example provides a high-entropy alloy with the composition AlCrFeNiVCuPd, and its preparation method is consistent with that of Example 1.

[0063] Comparative Example 9 This comparative example provides a high-entropy alloy with the composition AlCrFeNiVCuB, and its preparation method is consistent with that of Example 1.

[0064] Comparative Example 10 This comparative example provides a composition of (AlCrFeNiVCu). 12 The high-entropy alloy of (SiTiPdB)7 is prepared using the same method as in Example 1.

[0065] Comparative Example 11 This comparative example provides a material of traditional flexible wheel alloy steel 40CrNiMo, and its original proportions are based on industry standard GB / T 3077-2015.

[0066] Comparative Example 12 This comparative example provides a material of 40Cr steel, and its original proportions are based on the industry standard GB / T 3077-2015.

[0067] Comparative Example 13 This comparative example provides a material of 304 stainless steel.

[0068] Comparative Example 14 This comparative example provides an Al 15 Cr 15 Fe 15 Ni 15 V 15 Cu 15 The Si2Ti2Pd3B3 composition is consistent with that of Example 1. The preparation method of this comparative example is different from that of Example 1. The main difference is that the cooling rate of step S2 in Example 1, which was 80°C / s, is adjusted to 30°C / s.

[0069] Comparative Example 15 This comparative example provides an Al 15 Cr 15 Fe 15 Ni 15 V 15 Cu 15 The Si2Ti2Pd3B3 composition is consistent with that of Example 1. The preparation method of this comparative example is different from that of Example 1. The main difference is that the cooling rate of step S2 in Example 1 is adjusted from 80℃ / s to 150℃ / s.

[0070] Experimental Example The materials provided in the above embodiments and comparative examples were subjected to tensile strength, Vickers hardness, and salt spray tests. The tensile strength test method was GB / T 228.1-2021, the Vickers hardness test method was GB / T 4340.1-2024, and the salt spray test method was GB / T 10125-2021. The test results are shown in Table 1.

[0071] Table 1. Statistical table of performance test results for different examples

[0072] Note: The chemical formulas of the elements in the high-entropy alloys in Comparative Examples 1-9 indicate that each element is in equal proportion.

[0073] The data in the table above shows that: Compared with Comparative Examples 1 and 2, Example 1 shows significant advantages in both comprehensive mechanical properties and corrosion resistance. Specifically, although both Comparative Examples 1 and 2 have slightly higher hardness, they pose a greater risk of brittle fracture when used as flexible wheel structures. Furthermore, their yield strength and corrosion resistance are inferior to those of Example 1. Further comparison of Example 1 and Comparative Examples 3 and 4 shows that the tensile strength of Comparative Examples 3 and 4 is far inferior to that of Example 1, and there is also a significant difference in corrosion resistance. The above results prove that the omission or substitution of any component in the multi-component composition provided in this application will lead to a decrease in the overall performance of the material. In Comparative Examples 5 to 10, the addition of higher amounts of non-metallic elements such as Si and B promoted the formation of intergranular compounds, resulting in a significant increase in hardness. While high hardness may be valuable in certain applications, it is not suitable for flexible wheel structures. Furthermore, the Ti and Pd elements introduced into the high-entropy alloy of this application can promote the formation of a passivation film, thus synergistically improving corrosion resistance.

[0074] Furthermore, Comparative Examples 11 and 12 used conventional alloy steel for flexible wheels, whose tensile strength and hardness were significantly lower than those of Example 1, and whose corrosion rate was significantly increased, indicating that conventional alloy steel materials for flexible wheels are difficult to meet the high-performance requirements of the flexible wheel material in this application. Comparative Example 13 used 304 stainless steel, which, compared to Example 1, had lower tensile strength and hardness, and poorer toughness. Comparative Examples 14 and 15 adjusted the cooling rate in step S2 of Example 1. When the cooling rate was too slow or too fast, the tensile strength, yield strength, and hardness were significantly lower than those of Example 1, and the corrosion rate also increased significantly, proving that the high-entropy alloy provided by this invention is sensitive to the cooling rate.

[0075] In summary, the multi-element high-entropy alloy material provided by this invention uses six elements—Al, Cr, Fe, Ni, V, and Cu—as the main elements, and adds Si, Ti, Pd, and B to form a multi-element high-entropy alloy material with high strength, hardness, and corrosion resistance. Specifically, Al and Ti promote the BCC phase, Ni and Fe stabilize the FCC phase, and Si and B refine grain boundaries, improving strength and plasticity. Cr, Al, and Ti form a dense passivation film, enhancing corrosion resistance. Al and Cr can jointly form a Cr2O3 / Al2O3-rich composite oxide layer, reducing the oxidation rate; they can also alter the distribution morphology of Cr and Ti, promoting the formation of a Cr-rich passivation film. Pd has significantly different atomic sizes and electronegativity from other constituent elements (such as Al and Cr). Adding the noble metal element Pd can appropriately improve the solid solution strengthening effect and can also form an antioxidant Pd-Si compound, increasing surface hardness. The multi-element high-entropy alloy material prepared using the above components possesses high strength, hardness, and corrosion resistance, making it suitable for manufacturing flexible wheels for harmonic reducers.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-component high-entropy alloy material, characterized in that, The atomic percentage of each component of the multi-element high-entropy alloy material is Al 8%-16%, Cr 10%-16%, Fe 15%-30%, Ni 15%-20%, V 10%-16%, Cu 5%-16%, Si 1%-3%, Ti 1%-3%, Pd 1%-3%, and B 1%-3%.

2. The multi-principal high-entropy alloy material of claim 1, wherein, The atomic ratio of Al:Cr:Fe:Ni:V:Cu is 1:1:1:1:1:1, and the atomic percentage of Si, Ti, Pd, and B is 2%-3% respectively.

3. The multi-principal high-entropy alloy material of claim 1, wherein, The atomic percentage of each component of the multi-element high-entropy alloy material is Al 15%, Cr 15%, Fe 15%, Ni 15%, V 15%, Cu 15%, Si 2%, Ti 2%, Pd 3%, and B 3%.

4. A method of producing a multi-principal high-entropy alloy material according to any one of claims 1-3, characterized by, It comprises: The metal raw materials of the components are pretreated and matched according to the atomic percentage; The ingot is melted into a casting ingot, the casting ingot is cut into a blank, and then solid solution treatment, aging treatment, and post-treatment are performed, followed by forming.

5. The method of claim 4, wherein the plurality of high-entropy alloy materials are prepared by the steps of: providing a plurality of metal powders; and mixing the plurality of metal powders to form a plurality of high-entropy alloy materials. The melting includes electric heating melting, followed by cooling to solid state as one melting process, which is repeated 3-5 times.

6. The method of claim 5, wherein the plurality of high-entropy alloy materials are prepared by the steps of: providing a plurality of metal powders; and mixing the plurality of metal powders to form a plurality of high-entropy alloy materials. The electric heating melting has a current of 200-300 A, a melting time of 3-5 minutes, and a cooling rate of 50-100℃ / s.

7. The method of claim 4, wherein the plurality of high-entropy alloy materials are prepared by the steps of: providing a plurality of metal powders; mixing the plurality of metal powders to form a mixture; and sintering the mixture to form the plurality of high-entropy alloy materials. The melting is carried out in a vacuum arc melting furnace, which is vacuumed to 4 x 10 -3 -6 x 10 -3 Pa before the melting, and then argon is filled to 0.04-0.06 Mpa.

8. The method of claim 4, wherein the multi-principal high-entropy alloy material is prepared by a method comprising: mixing the plurality of metals to form a mixture; and sintering the mixture to form the multi-principal high-entropy alloy material. The solid solution treatment includes placing the blank in a vacuum heat treatment furnace, holding at 1000-1100℃ for 1-3 hours, and then water quenching, the cooling rate of the water quenching being ≥200℃ / s.

9. The method of claim 4, wherein the plurality of high-entropy alloy materials are prepared by a process comprising: providing a plurality of metal powders; mixing the plurality of metal powders to form a mixture; and sintering the mixture to form the plurality of high-entropy alloy materials. The aging treatment includes holding at 500-700℃ for 5-7 hours, and then air cooling to room temperature.

10. A harmonic reducer characterized by, It comprises a flexspline made of the multi-element high-entropy alloy material prepared by the preparation method of the multi-element high-entropy alloy material according to any one of claims 1-3 or any one of claims 4-9.

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