An excellent friction and wear resistant additive manufacturing high-entropy alloy and a preparation method and application thereof

Abstract

This invention discloses a high-entropy alloy with excellent friction and wear resistance for additive manufacturing, its preparation method, and its applications, relating to the field of metal additive manufacturing technology. The preparation method is as follows: 1) High-entropy alloy powder is prepared by gas atomization of metal powder; 2) A three-dimensional model of the part is established on a computer, slicing data is obtained, and imported into an electron beam printing device; 3) The high-entropy alloy powder is electron beam printed to obtain the high-entropy alloy. The high-entropy alloy preparation method of this invention has high experimental repeatability and feasibility, a simple process, is easy to operate, and has strong repeatability. The prepared high-entropy alloy exhibits excellent frictional properties, promoting the development and research of high-entropy alloy preparation in the field of tribology through additive manufacturing.

Description

Technical Field

[0001] This invention relates to the field of metal additive manufacturing technology, specifically to a high-entropy alloy with excellent friction and wear resistance for additive manufacturing, its preparation method, and its application. Background Technology

[0002] High-entropy alloys are novel multi-principal element alloys composed of multiple principal elements. They are defined as solid solution alloys containing five or more elements in equimolar or near-equimolar ratios, with each element comprising 5% to 35% of the total atomic weight. Their microstructure is primarily composed of simple BCC, FCC, or HCP phases. Common processing methods include mechanical alloying, plasma spraying, arc melting, sputtering vapor deposition, and laser cladding. Compared to traditional alloys based on a single principal element, high-entropy alloys exhibit high strength, high hardness, high thermal stability, high corrosion resistance, strong fatigue resistance, and excellent high-temperature softening resistance, making them widely used in aerospace, nuclear energy, new energy, and medical fields. The superior performance of high-entropy alloys is widely recognized due to the synergistic effects of high-entropy, hysteretic diffusion, lattice distortion, and the "cocktail" effect. Therefore, the unique design philosophy of high-entropy alloys makes them suitable candidate materials for high-temperature friction and wear applications.

[0003] Compared with high-entropy alloys prepared by traditional methods, high-entropy alloys prepared by electron beam printing can overcome the common metallurgical defects such as porosity and inclusions in traditional high-entropy alloys, as well as the limitations of the preparation technology itself and the complexity of subsequent thermomechanical processing. With the rapid development of high technologies such as aerospace, marine engineering, and nuclear energy in my country, the operating conditions of mechanical components are becoming increasingly harsh and complex, involving extreme environments and conditions such as high load, high speed, high / low temperature alternation, strong corrosion, and special media. Friction, wear, and lubrication problems have become bottlenecks affecting the reliability and lifespan of mechanical systems. These are all major challenges for electron beam printing of high-entropy alloys.

[0004] Therefore, how to prepare a high-entropy additive manufacturing alloy with excellent friction and wear resistance through electron beam printing technology is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a high-entropy alloy with excellent friction and wear resistance in additive manufacturing, its preparation method, and its application.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a method for preparing a high-entropy alloy with excellent friction and wear resistance through additive manufacturing, comprising the following steps:

[0008] 1) Prepare high-entropy alloy powder by gas atomization of metal powder according to the specified ratio;

[0009] 2) Create a 3D model of the part on the computer, obtain the slicing data, and import it into the electron beam printing equipment;

[0010] 3) High-entropy alloys are obtained by electron beam printing of high-entropy alloy powder;

[0011] The electron beam printing voltage is 60KV, the selective melting current is 5-6.5mA, the scanning speed is 0.4-0.65m / s, and the scanning spacing is 0.1-0.2mm.

[0012] Beneficial effects: High-entropy alloys printed under the above parameters have good formability, smooth surface, and no obvious defects such as cracks or bulges.

[0013] Preferably, the particle size of the high-entropy alloy powder in step 1) is 15-53 μm or 53-150 μm.

[0014] Preferably, the preheating temperature for electron beam printing in step 3) is 850°C; the preheating is performed under vacuum conditions.

[0015] Preferably, the powder thickness of the electron beam printing in step 3) is 50 μm.

[0016] Beneficial effects: Smaller powder particle size is beneficial for improving sintering densification and sintering strength. Smaller metal powder particles can also fill the gaps between larger particles, increasing the powder's packing density and thus improving the surface quality and strength of the printed metal parts. However, if there are too many fine particles, "spheroidization" can easily occur during sintering, leading to uneven powder thickness. Therefore, this invention uses two powder particle sizes: 15–53 μm or 53–150 μm for experiments.

[0017] Preferably, the metal powder in step 1) is based on (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The molar ratio of each element in the nominal chemical composition of Al7Ti7 high-entropy alloy is determined by using iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder.

[0018] The purity of the iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder is ≥99 wt.%.

[0019] Another object of the present invention is to provide a high-entropy additive manufacturing alloy with excellent friction and wear resistance prepared by the aforementioned preparation method.

[0020] Preferably, the high-entropy additive manufacturing alloy with excellent friction and wear resistance has a two-phase solid solution structure of face-centered cubic FCC and L21 phases, with a density ≥99%, a hardness of 560HV0.2, and an average grain size of 33.23μm.

[0021] Preferably, the friction coefficient of the high-entropy additive manufacturing alloy with excellent friction and wear resistance is 0.391 to 0.7 at room temperature and 0.17 to 0.3 at high temperatures of 600 to 900°C.

[0022] Another object of the present invention is to provide an application of the aforementioned high-entropy additive manufacturing alloy with excellent friction and wear resistance in customized parts in the aerospace field.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] 1. This invention successfully printed a smooth-surfaced (Fe) material using electron beam selective melting technology. 29.35 Co 28.69 Ni 27.96 ) 86 Al7Ti7 high-entropy alloy bulk material exhibits excellent tribological properties. At room temperature, the high-entropy alloy prepared in this invention shows a friction coefficient of 0.391–0.7 with a Si3N4 friction pair under different parameters at room temperature, and a wear rate of 53.62–79.71 × 10⁻⁶. - 5 mm 3 / N·m; the coefficient of friction of the friction pair with Si3N4 at high temperatures of 600~900℃ is 0.17~0.3, and the wear rate is 15.62~125.67×10 -6 mm 3 / N·m.

[0025] 2. The high-entropy alloy prepared by this invention has a two-phase solid solution structure of face-centered cubic FCC and L21 phases, with a density ≥99%, a hardness of 560HV0.2, and an average grain size of 33.23μm.

[0026] 3. This invention optimizes parameters such as voltage, selective melting current, scanning speed, and scanning spacing in the electron beam printing process to prepare a high-entropy alloy with good high-temperature softening resistance. This alloy has a synergistic effect with the oxide glaze layer with excellent nanomechanical properties formed by thermal oxidation and tribochemical reactions during the friction process, thereby enabling the high-entropy alloy to have good high-temperature tribological properties.

[0027] 4. The preparation method of the high-entropy alloy of this invention has high experimental repeatability and feasibility, simple process, easy operation, strong repeatability, and the high-entropy alloy prepared has excellent frictional properties, which promotes the development and research of additive manufacturing preparation of high-entropy alloys in the field of tribology. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a macroscopic morphology image of the upper surface of the high-entropy alloy prepared according to the parameters of group 5 in Example 1 of the present invention;

[0030] Figure 2 This is a SEM image of the upper surface of the high-entropy alloy prepared according to the parameters of group 5 in Example 1 of the present invention after etching.

[0031] Figure 3 The friction and wear coefficient curves of the high-entropy alloy prepared under different printing parameters in Example 1 of the present invention are shown.

[0032] Figure 4 The wear rate curves of the high-entropy alloy prepared under different printing parameters in Example 1 of this invention are shown in air.

[0033] Figure 5 The friction and wear coefficient curves of the high-entropy alloy prepared in Example 2 of this invention at different particle sizes are shown.

[0034] Figure 6 The friction and wear coefficient curves of the high-entropy alloy prepared in Test Example 1 of this invention under different loads are shown.

[0035] Figure 7 The wear rate curves of the high-entropy alloy prepared in Test Example 2 of this invention under different loads are shown.

[0036] Figure 8 The friction coefficient curves of the high-entropy alloy prepared in Test Example 2 of this invention at different temperatures;

[0037] Figure 9 The wear rate curves of the high-entropy alloy prepared in Test Example 2 of this invention at different temperatures are shown.

[0038] Figure 10 Nanohardness curves of the surface of the high-entropy alloy oxide layer prepared for Test Example 2 of the Invention at different temperatures;

[0039] Figure 11 The friction and wear coefficient curves of the high-entropy alloy prepared for comparison are shown in air. Detailed Implementation

[0040] This invention provides a high-entropy alloy with excellent friction and wear resistance in additive manufacturing. When this high-entropy alloy material is used in friction with Si3N4 at room temperature and under different printing parameters, the coefficient of friction ranges from 0.38 to 0.7; at room temperature and with powder particle sizes of 15–53 μm, the coefficient of friction is approximately 0.45; at room temperature and under different loads, the coefficient of friction ranges from 0.35 to 0.48; and at high temperatures of 600℃–900℃, the coefficient of friction ranges from 0.17 to 0.3, with a wear rate ranging from 15.62 to 125.67 × 10⁻⁶. -6 mm 3 / N·m.

[0041] The high-entropy alloy of this invention is based on (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The molar ratios of each element in the nominal chemical composition of Al7Ti7 high-entropy alloy were determined, and the sum of the atomic percentages of each component was 100 at%.

[0042] As a preferred embodiment of the high-entropy alloy with excellent friction and wear resistance of the present invention, the high-entropy alloy has a two-phase solid solution structure of face-centered cubic FCC and L21 phases, with a density of 99%, a hardness of 560HV0.2, and an average grain size of 33.23μm.

[0043] This invention also provides a method for preparing the above-mentioned high-entropy alloy with excellent friction and wear resistance, specifically the method comprising the following steps:

[0044] Step 1: The high-entropy alloy powder is proportioned and prepared using a gas atomization method (Fe...). 29.35 Co 28.69 Ni 27.96 ) 86 Al7Ti7 high-entropy alloy powder;

[0045] Step 2: Use Magics 3D modeling software on a computer to design a 3D model of the part and obtain slicing data;

[0046] Step 3: Electron beam printing is performed on the pre-prepared high-entropy alloy powder to obtain a high-entropy alloy. The electron beam process parameters are: selective melting current of 5-6.5 mA, scanning speed of 0.4-0.65 m / s, and scanning spacing of 0.1-0.2 mm.

[0047] In some preferred embodiments of the high-entropy alloy preparation method of the present invention, the high-entropy alloy powder includes iron powder, cobalt powder, nickel powder, aluminum powder and titanium powder.

[0048] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the purity of iron powder, cobalt powder, nickel powder, aluminum powder and titanium powder is 99 wt.%.

[0049] In some preferred embodiments of the high-entropy alloy preparation method of the present invention, the initial particle size of the high-entropy alloy powder prepared by the gas atomization method is 53-150 μm and 15-53 μm.

[0050] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the vacuum preheating temperature is 850°C.

[0051] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the powder coating thickness is 50 μm.

[0052] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the selective melting current is 5mA.

[0053] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the scanning speed is 0.4 m / s.

[0054] In some preferred embodiments of the high-temperature friction and wear resistant high-entropy alloy preparation method of the present invention: the scanning interval is 0.1 mm.

[0055] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0056] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0057] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0058] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0059] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.

[0060] Unless otherwise specified, "room temperature" and "normal temperature" in this invention refer to 25±2℃.

[0061] All raw materials used in the following embodiments of the present invention are commercially available.

[0062] Example 1

[0063] Raw material preparation: According to (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The nominal chemical composition of Al7Ti7 high-entropy alloy is prepared by using iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder with a purity ≥99wt.%, and the powder is prepared by aerosol method to form a particle size between 53μm and 150μm (Fe). 29.35 Co 28.69 Ni 27.96 ) 86 Al7Ti7 high-entropy alloy powder.

[0064] Model building: A block model with dimensions of 30mm×30mm×20mm was designed using Magics 3D modeling software, and the slice data was imported into the selected area electron beam melting equipment.

[0065] Printed Samples: Six sets of samples were printed using the Qbean Lab 200 metal 3D printer developed by Tianjin Qingyan Zhishu Technology Co., Ltd., to prepare high-entropy alloys. The vacuum preheating temperature for electron beam printing was 850℃. Other process parameters are shown in Table 1.

[0066] Table 1 Other process parameters

[0067]

[0068] Figure 1 The image shows the macroscopic morphology of the upper surface of the high-entropy alloy prepared according to the parameters of the second group in Example 1 of this invention. As can be seen from the image, the sample surface is flat.

[0069] The obtained high-entropy alloy surface was polished to a mirror finish for subsequent characterization and testing.

[0070] Characterization and testing:

[0071] (1) SEM and hardness testing Figure 2 The image shows the SEM image of the upper surface of the high-entropy alloy prepared according to the parameters of the second group in Example 1 of this invention after etching. As can be seen from the image, the high-entropy alloy has a typical equiaxed crystal structure, with a large number of L21 and L12 phases dispersed within the equiaxed crystals. The average grain size of the equiaxed crystals is 33.23 μm. The hardness of the upper surface of the high-entropy alloy was tested, and its average Vickers hardness was 560 HV0.2 (where 0.2 means that the selected test force is 0.2 kg, and HV0.1 and HV0.2 are two different test methods in hardness testing).

[0072] (2) Friction and wear testing: Tribological tests were conducted on a ball-disc friction and wear testing machine (BRUKER, UMTTribo Lab, Germany). Si3N4 ceramic balls with a diameter of 6.25 mm were used as the friction pair, and were cyclically rolled on the HEAC surface for 1800 s with an external load of 15 N. New ceramic balls were used after each test. The coefficient of friction was recorded in detail by the testing machine during the sliding process.

[0073] Figure 3 The curves showing the friction and wear coefficients of the high-entropy alloy prepared under different printing parameters in Example 1 of this invention are shown. Figure 4 The figure shows the wear rate curves of the high-entropy alloy prepared under different printing parameters in Example 1 of this invention in air. As can be seen from the figure, the sample prepared according to the parameters in group 2 has the lowest friction coefficient, 0.408, and a wear rate of 53.62 × 10⁻⁶. -5 mm 3 / N·m.

[0074] Therefore, a melting current of 5mA, a scanning speed of 0.4m / s, and a scanning spacing of 0.1mm are the preferred technical solutions.

[0075] Example 2

[0076] Raw material preparation: According to (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The nominal chemical composition of Al7Ti7 high-entropy alloy is formulated using iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder with a purity ≥99wt.%. Particle sizes ranging from 1μm to 53μm (Fe) are prepared using an aerosol method. 29.35 Co 28.69 Ni 27.96 ) 86 Al7Ti7 high-entropy alloy powder.

[0077] Model building: A block model with dimensions of 30mm×30mm×20mm was designed using Magics 3D modeling software, and the slice data was imported into the selected area electron beam melting equipment.

[0078] Printed Samples: Samples were printed using the Qbean Lab 200 metal 3D printer developed by Tianjin Qingyan Zhishu Technology Co., Ltd., to prepare high-entropy alloys. The vacuum preheating temperature for electron beam printing was 850℃, the selective melting current was 5mA, the scanning speed was 0.4m / s, the scanning spacing was 0.1mm, and the powder thickness was 50μm.

[0079] The obtained high-entropy alloy surface was polished to a mirror finish and then subjected to friction and wear tests.

[0080] Friction and wear tests: Tribological tests were conducted on a ball-disc friction and wear testing machine (BRUKER, UMT TriboLab, Germany). Si3N4 ceramic balls with a diameter of 6.25 mm were used as the friction pair, and were cyclically rolled on a HEAC surface for 1800 s under an external load of 15 N. New ceramic balls were used after each test. The coefficient of friction was recorded in detail by the testing machine during the sliding process. Figure 5 The graph shows the friction and wear coefficient curve of the high-entropy alloy prepared in Example 2 of this invention in air. As can be seen from the graph, the friction coefficient of this high-entropy alloy in air is approximately 0.45, and its wear rate is calculated to be 57.32 × 10⁻⁶. - 5 mm 3 / N·m.

[0081] Test Example 1: Investigating the effect of external load on the tribological properties of high-entropy alloys.

[0082] Four identical high-entropy alloys were prepared according to the preferred technical solution of Group 2 in Example 1. The surfaces of the obtained high-entropy alloys were polished to a mirror finish and subjected to friction and wear tests.

[0083] Friction and wear tests: Tribological tests were conducted on a ball-disc friction and wear testing machine (BRUKER, UMT TriboLab, Germany). Si3N4 ceramic balls with a diameter of 6.25 mm were used as the friction pair, and were cyclically rolled on a HEAC surface for 1800 s under different applied loads (7 N, 10 N, 13 N, 20 N), with new ceramic balls used after each test. The coefficient of friction was recorded in detail by the testing machine during the sliding process. Figure 6 The graph shows the friction and wear coefficient curves of the high-entropy alloy in Test Example 1 of this invention under different loads in air. As can be seen from the graph, the friction coefficients of these high-entropy alloys range from 0.36 to 0.48. Figure 7 It can be seen that, based on calculations, the wear rate of these high-entropy alloys is between 19 and 59.5 × 10⁻⁶.-5 mm 3 Between / N·m, the overall friction performance is optimal when the applied load is 7N, with a friction coefficient of 0.36 and a wear rate of 19×10⁻⁶. -5 mm 3 / N·m.

[0084] Test Example 2: Investigating the effect of temperature on the tribological properties of high-entropy alloys.

[0085] Five identical high-entropy alloys were prepared according to the preferred technical solution of Group 2 in Example 1. The surfaces of the obtained high-entropy alloys were polished to a mirror finish and subjected to friction and wear tests.

[0086] Friction and Wear Tests: Tribological tests were conducted on a ball-disc friction and wear testing machine (BRUKER, UMT TriboLab, Germany). Si3N4 ceramic balls with a diameter of 6.25 mm were used as the friction pair. A load of 7 N was applied and the balls were cyclically rolled on a HEAC surface for 1800 s. Tests were then conducted at different temperatures (25℃, 600℃, 700℃, 800℃, 850℃, and 900℃), with new ceramic balls used after each test. The coefficient of friction was recorded in detail by the testing machine during the sliding process. The coefficients of friction at different temperatures are shown below. Figure 8 As shown in the figure, the friction coefficient of the high-entropy alloy at different temperatures ranges from 0.16 to 0.3; the wear rate is as follows: Figure 9 As shown in the figure, the wear rate of the high-entropy alloy at different temperatures ranges from 15.62 to 125.67 × 10⁻⁶. -6 mm 3 / N·m, the wear rate is minimum at a temperature of 700℃, which is 15.62×10. -6 mm 3 / N·m; Nanohardness curve of high-entropy alloy oxide layer surface as shown in Figure 10 As shown, its nanohardness ranges from 6.87 to 9.41 GPa, with the highest nanohardness of 9.41 GPa at a temperature of 900℃.

[0087] Comparative example:

[0088] Raw material preparation: According to (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The nominal chemical composition of Al7Ti7 high-entropy alloy is prepared by using iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder with a purity ≥99wt.%, and the powder is prepared by aerosol method to form a particle size between 53μm and 150μm (Fe). 29.35 Co 28.69 Ni 27.96 ) 86Al7Ti7 high-entropy alloy powder.

[0089] Model building: A block model with dimensions of 30mm×30mm×20mm was designed using Magics 3D modeling software, and the slice data was imported into the selected area electron beam melting equipment.

[0090] Printed Samples: Samples were printed using the Qbean Lab 200 metal 3D printer developed by Tianjin Qingyan Zhishu Technology Co., Ltd., to prepare high-entropy alloys. The vacuum preheating temperature for electron beam printing was 850℃, the selective melting current was 6.7mA, the scanning speed was 0.38m / s, the scanning spacing was 0.1mm, and the powder thickness was 50μm.

[0091] The obtained high-entropy alloy surface was polished to a mirror finish and then subjected to friction and wear tests.

[0092] Friction and wear tests: Tribological tests were conducted on a ball-disc friction and wear testing machine (BRUKER, UMT TriboLab, Germany). Si3N4 ceramic balls with a diameter of 6.25 mm were used as the friction pair, and were cyclically rolled on a HEAC surface for 1800 s under an external load of 15 N. New ceramic balls were used after each test. The coefficient of friction was recorded in detail by the testing machine during the sliding process. Figure 11 The graph shows the friction and wear coefficient curve of the high-entropy alloy prepared in comparison to that of the present invention in air. As can be seen from the graph, the friction coefficient of this high-entropy alloy in air is approximately 0.80. The calculated wear rate is 91.79 × 10⁻⁶. - 5 mm 3 / N·m, compared with the examples, the friction coefficient and wear rate of the high-entropy alloy prepared under this parameter are significantly increased, and the friction and wear resistance is poor.

[0093] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-entropy additive manufacturing alloy with excellent friction and wear resistance, characterized in that, The high-entropy alloy with excellent friction and wear resistance in additive manufacturing has a two-phase solid solution structure of face-centered cubic FCC and L21 phases, with a density ≥99%, an average hardness of 560HV0.2, and an average grain size of 33.23μm. The method for preparing the high-entropy additive manufacturing alloy with excellent wear and tear resistance includes the following steps: 1) High-entropy alloy powder is prepared by gas atomization of metal powder; 2) Create a 3D model of the part on the computer, obtain the slicing data, and import it into the electron beam printing equipment; 3) High-entropy alloys are obtained by electron beam printing of high-entropy alloy powder; The electron beam printing voltage is 60 kV, the selective melting current is 5–6.5 mA, and the scanning speed is 0.4–0.65 m / s. The scanning interval is 0.1–0.2 mm; The particle size of the high-entropy alloy powder mentioned in step 1) is 15–53 μm or 53–150 μm; The metal powder described in step 1) is based on (Fe 29.35 Co 28.69 Ni 27.96 ) 86 The molar ratios of each element in the nominal chemical composition of Al7Ti7 high-entropy alloy are determined using iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder.

2. The high-entropy additive manufacturing alloy with excellent friction and wear resistance according to claim 1, characterized in that, Step 3) The preheating temperature for electron beam printing is 850°C; the preheating is carried out under vacuum conditions.

3. The high-entropy additive manufacturing alloy with excellent wear resistance according to claim 1, characterized in that, Step 3) The powder thickness of the electron beam printing is 50 μm.

4. The high-entropy additive manufacturing alloy with excellent friction and wear resistance according to claim 1, characterized in that, The purity of the iron powder, cobalt powder, nickel powder, aluminum powder, and titanium powder is ≥99 wt.%.

5. The high-entropy additive manufacturing alloy with excellent friction and wear resistance according to claim 1, characterized in that, The aforementioned high-entropy additively manufactured alloy with excellent wear resistance exhibits a friction coefficient of 0.391–0.7 with a Si3N4 friction pair at different parameters at room temperature, and a wear rate of 19–59.5 × 10⁻⁶. -5 mm 3 / N·m; the coefficient of friction of the friction pair with Si3N4 at high temperatures of 600~900℃ is 0.17~0.3, and the wear rate is 15.62~125.67×10 -6 mm 3 / N·m.

6. The application of the high-entropy additive manufacturing alloy with excellent friction and wear resistance as described in any one of claims 1-5 in customized parts in the aerospace field.

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