CN115555561A - A kind of high-entropy alloy self-lubricating material and titanium alloy composite component and its preparation method and application - Google Patents

Abstract

The invention relates to the technical field of high-entropy alloys, in particular to a high-entropy alloy self-lubricating material and titanium alloy composite component and its preparation method and application. The present invention performs solid-phase diffusion welding under vacuum conditions to realize dissimilar connections between titanium alloys and high-entropy alloy self-lubricating materials, and obtain metallurgical bonding at the welding interface, compact structure, and defect-free joints, giving full play to their respective advantages. It can reduce the friction coefficient and improve the wear resistance of titanium alloy.

Description

A kind of high-entropy alloy self-lubricating material and titanium alloy composite component and its preparation method and application

technical field

The invention relates to the technical field of high-entropy alloys, in particular to a high-entropy alloy self-lubricating material and titanium alloy composite component and its preparation method and application.

Background technique

Due to their excellent comprehensive mechanical properties, titanium and titanium alloys have been highly valued and widely used in the aerospace field. However, its wear resistance is not strong, and its oxidation resistance decreases significantly with the increase of temperature, especially for wear-resistant parts such as aviation joint bearings, and wear becomes its main failure mode. High-entropy alloys (HEA) exhibit properties superior to traditional metal materials, such as high strength, high wear resistance, and good radiation resistance, and have become the research frontier and hot spot in the field of alloys in recent years. The composite structural member composed of titanium alloy/HEA dissimilar metal can combine the excellent properties of titanium alloy and HEA, so that the parts can improve the wear resistance on the basis of excellent mechanical properties.

At present, there are not many studies on the weldability of HEA and dissimilar materials, mainly involving the dissimilar welding of mature HEA, such as CoCrFeMnNi and CoCrFeNiCu, and stainless steel. Researchers from the University of New Lisbon, Portugal (J.P.Oliveira, JiajiaShen, Z.Zeng, Jeong Min Park, Yeon Taek Choi, N.Schell, E.Maawad, N.Zhou, HyoungSeop Kim, Dissimilar laser welding of a CoCrFeMnNi high entropy alloy to316stainless steel, Script Materialia, Volume 206, 2022, 114219) obtained defect-free joints between CoCrFeMnNi and 316 stainless steel by laser welding process. Domestic Li Juan and others (Li Juan, Zhao Honglong, Zhou Nian, Zhang Yingzhe, Qin Qingdong, Su Xiangdong, CoCrFeNiCu high-entropy alloy and 304 stainless steel vacuum diffusion welding, Acta Metallica, 2021, 57, 1567-1578) studied the bonding of CoCrFeNiCu and 304 stainless steel. Vacuum diffusion welding, the results show that the strength of the welded joint is higher than that of the base metal, and a high-quality connection can be achieved. The dissimilar welding related to titanium alloys is mainly focused on the connection with stainless steel, copper, etc., but in the process of dissimilar fusion welding, the mixing of the two base materials may promote the formation of harmful phases, especially with titanium alloys during the fusion welding process. A large number of brittle intermetallic compounds are easily generated in the medium, which deteriorates the performance of the joint. Therefore, effectively preventing the massive generation of intermetallic compounds is a difficulty in dissimilar welding, and the welding of HEA and titanium alloys has not yet been reported.

Contents of the invention

The purpose of the present invention is to provide a high-entropy alloy self-lubricating material and titanium alloy composite component and its preparation method and application. The preparation method can realize heterogeneous connection between the high-entropy alloy self-lubricating material and titanium alloy, and realize the welding interface Metallurgical bonding is achieved, and a welded joint with a dense structure and no defects is obtained.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

The invention provides a method for preparing a high-entropy alloy self-lubricating material and a titanium alloy composite component, comprising the following steps:

After mixing medium-entropy alloy, aluminum and silver, spark plasma sintering is carried out to obtain high-entropy alloy self-lubricating material;

After wrapping the high-entropy alloy self-lubricating material and titanium alloy, solid-phase diffusion welding is performed to obtain the high-entropy alloy self-lubricating material and titanium alloy composite component;

The process of the solid phase diffusion welding process is as follows: boost the pressure to 10MPa at room temperature, raise the temperature to 600-750°C at a heating rate of 10-30°C/min, keep the temperature for 5-15min, and continue to increase the pressure to 30-40MPa to Heating rate of 8-10°C/min After second heating to 700-900°C, heat preservation and pressure holding for 15-30 minutes, after boosting to 80-110MPa, heating rate of 8-10°C/min three times to 1000-1200 ℃, heat preservation and pressure for 3~7h, air cooling.

Preferably, the mass ratio of the medium entropy alloy, aluminum and silver is (75-85):(5-15):(5-15).

Preferably, the medium-entropy alloy is a CoCrNiFe high-entropy alloy;

The titanium alloy is TC4 titanium alloy.

Preferably, the particle size of the medium entropy alloy is 10-50 μm.

Preferably, the particle size of the aluminum is 10-50 μm;

The particle size of the silver is 15-35 μm.

Preferably, the spark plasma sintering process is as follows: under the pressure of 20-40 MPa, the heating rate is 8-10° C./min from room temperature to 700-1000° C., and the molding is performed for 10-20 minutes.

Preferably, the spark plasma sintering process is as follows: under a pressure of 25-35 MPa, a heating rate of 8-10° C./min is raised from room temperature to 900-1000° C., and molding is carried out for 15-20 minutes.

Preferably, the process of the solid phase diffusion welding treatment is: increase the pressure to 10MPa at room temperature, raise the temperature to 600-700°C at a rate of 15-25°C/min, keep the temperature for 8-12min, and continue to increase the pressure to 35-700°C. 40MPa, heat up to 700-800°C for the second time at a heating rate of 8-10°C/min, hold the pressure for 20-30 minutes, and raise the pressure to 100-110MPa, then heat up three times at a heating rate of 8-10°C/min to 1050～1100℃, heat preservation and pressure holding for 5～6 hours, air cooling.

The present invention also provides a high-entropy alloy self-lubricating material and titanium alloy composite component prepared by the preparation method described in the above technical solution.

The present invention also provides the application of the high-entropy alloy self-lubricating material and titanium alloy composite component in the preparation of high-strength, tough and wear-resistant parts described in the technical solution.

The invention provides a preparation method of a high-entropy alloy self-lubricating material and a titanium alloy composite component, comprising the following steps: after mixing a medium-entropy alloy, aluminum and silver, performing discharge plasma sintering to obtain a high-entropy alloy self-lubricating material; After the high-entropy alloy self-lubricating material and titanium alloy are wrapped, solid-phase diffusion welding is performed under vacuum conditions to obtain the high-entropy alloy self-lubricating material and titanium alloy composite component; the solid-phase diffusion welding process The process is: increase the pressure to 10MPa at room temperature, raise the temperature to 600-750℃ at a rate of 10-30℃/min, keep the temperature for 5-15min, continue to increase the pressure to 30-40MPa, and increase the temperature at a rate of 8-10℃/min After raising the temperature to 700-900°C for the second time, keep the temperature for 15-30 minutes, and after increasing the pressure to 80-110MPa, raise the temperature three times to 1000-1200°C at a heating rate of 8-10°C/min, and keep the pressure for 3-7 hours , air cooled. The present invention carries out the solid phase diffusion welding process to make the titanium alloy and the high-entropy alloy self-lubricating material contact with each other initially, and then under the action of high temperature and external pressure, the surface is plastically deformed through yield and creep mechanisms, and The contact area of the surface gradually increases, and the atoms on the contact surface diffuse with each other to form a tight bond. Due to defects such as lattice distortion, dislocation, and vacancies caused by deformation, the interface atoms are in a highly activated state, and the tissue composition is gradually homogenized. The original interface Disappearance, realize heterogeneous connection, get metallurgical bonding at the welding interface, compact structure, and defect-free joints, give full play to their respective advantages, reduce the friction coefficient, and improve the wear resistance of titanium alloys.

Description of drawings

Fig. 1 is the SEM figure of HEA/TC4 self-lubricating composite material described in embodiment 1;

2 is a SEM image of the HEA/TC4 self-lubricating composite material described in Comparative Example 2.

detailed description

The invention provides a method for preparing a high-entropy alloy self-lubricating material and a titanium alloy composite component, comprising the following steps:

After mixing medium-entropy alloy, aluminum and silver, spark plasma sintering is carried out to obtain high-entropy alloy self-lubricating material;

After wrapping the high-entropy alloy self-lubricating material and titanium alloy, solid-phase diffusion welding is performed to obtain the high-entropy alloy self-lubricating material and titanium alloy composite component;

The process of the solid phase diffusion welding treatment is as follows: pressurize to 10MPa at room temperature, raise the temperature to 600-750°C at a rate of 10-30°C/min, keep warm for 5-15min, continue to increase the pressure to 30-40MPa, and Heating rate of 8-10°C/min After second heating to 700-900°C, heat preservation and pressure holding for 15-30 minutes, after boosting to 80-110MPa, heating rate of 8-10°C/min three times to 1000-1200 ℃, heat preservation and pressure for 3~7h, air cooling.

In the present invention, unless otherwise specified, all preparation materials are commercially available products well known to those skilled in the art.

In the invention, after mixing the medium-entropy alloy, aluminum and silver, the discharge plasma sintering is carried out to obtain the high-entropy alloy self-lubricating material.

In the present invention, the medium-entropy alloy is preferably a CoCrNiFe-based high-entropy alloy, and the CoCrNiFe-based high-entropy alloy is preferably an equiatomic ratio CoCrNiFe alloy; the particle size of the high-entropy alloy is preferably 10-50 μm.

In the present invention, the particle size of the aluminum is preferably 10-50 μm.

In the present invention, the particle size of the silver is preferably 15-35 μm.

In the present invention, the mass ratio of the high-entropy alloy, aluminum and silver is preferably (75-85): (5-15): (5-15), more preferably (78-82): (8-12 ): (8~12).

In the present invention, the function of the silver is a solid lubricant, and the function of the aluminum is to prepare Al _x CoCrNiFe five-element high-entropy alloys with different Al contents from CoCrNiFe.

In the present invention, the mixing method is preferably ball milling, and the present invention does not have any special limitation on the ball milling process, and it is carried out using a process well known to those skilled in the art to ensure that the high-entropy alloy, aluminum and silver are mixed uniformly That's it.

In the present invention, the process of spark plasma sintering is preferably: under the pressure of 20-40MPa, the heating rate is 8-10°C/min from room temperature to 700-1000°C, and the molding is 10-20min; more preferably Under the pressure of 25-35 MPa, the heating rate is 8-10 °C/min from room temperature to 900-1000 °C, and the molding is performed for 15-20 min.

In the present invention, the spark plasma sintering is preferably placing the mixed mixture in a graphite mold for spark plasma sintering.

In the present invention, the function of the spark plasma sintering is to realize the preparation of _AlxCoCrNiFe -based high-entropy alloy self-lubricating composite material.

After the spark plasma sintering is completed, the present invention also includes sequential cooling and demolding; the present invention does not have any special limitations on the process of cooling, and it can be lowered to room temperature by a process well known to those skilled in the art; the present invention There is no special limitation on the demoulding process, and it can be carried out by a process well known to those skilled in the art.

After the high-entropy alloy self-lubricating material is obtained, the present invention wraps the high-entropy alloy self-lubricating material and the titanium alloy, and performs solid phase diffusion welding treatment to obtain the high-entropy alloy self-lubricating material and titanium alloy composite component.

In the present invention, the titanium alloy is preferably TC4 titanium alloy, and the chemical composition of the TC4 titanium alloy is preferably Ti ₆ Al ₄ V.

Before wrapping, the present invention preferably pretreats the high-entropy alloy self-lubricating material and the titanium alloy respectively, and the pretreatment preferably includes successive grinding and polishing; the present invention does not have any For specific limitations, procedures well known to those skilled in the art can be used.

In the present invention, the process of wrapping is preferably placing the high-entropy alloy self-lubricating material and titanium alloy in a wrapping of carbon steel, vacuuming, and vacuum packaging to obtain bag cover. The present invention does not have any special limitation on the process of vacuuming, and it can be carried out by a process well known to those skilled in the art.

After obtaining the jacket for hot isostatic pressing treatment, the present invention preferably further includes performing sandblasting on the obtained jacket. The present invention does not have any special limitation on the sandblasting process, and it can be carried out by using the process well known to those skilled in the art. In the present invention, the purpose of the sand blasting treatment is to remove the oil stain on the surface of the sheath so as to pollute the furnace cavity of the equipment furnace.

In the present invention, the process of the solid phase diffusion welding treatment is as follows: pressurize to 10MPa at room temperature, raise the temperature to 600-750°C at a rate of 10-30°C/min, keep the temperature for 5-15min, and continue to increase the pressure to 30-40MPa, heat up to 700-900°C for the second time at a heating rate of 8-10°C/min, hold heat and hold pressure for 15-30min, increase the pressure to 80-110MPa, and heat up three times at a heating rate of 8-10°C/min Raise the temperature to 1000-1200°C, hold the heat for 3-7 hours, and cool in air; it is preferred to raise the pressure to 10MPa at room temperature, raise the temperature to 600-700°C at a rate of 15-25°C/min, keep the temperature for 8-12min, and continue to rise Press down to 35-40MPa, heat up to 700-800°C for the second time at a heating rate of 8-10°C/min, keep the pressure for 20-30 minutes, and raise the pressure to 100-110MPa, then raise the temperature at a rate of 8-10°C/min Raise the temperature three times to 1050-1100°C, keep the temperature and pressure for 5-6 hours, and cool in air.

In the present invention, the solid phase diffusion welding treatment is preferably performed in hot isostatic pressing equipment.

In the present invention, the effect of controlling the condition parameters of the solid phase diffusion welding treatment within the above range is to make the high-entropy alloy self-lubricating composite material and the titanium alloy dissimilar interface contact together seamlessly, and the metal connection is almost free Significant plastic deformation and oxidation will occur, and the contact area will increase after pressure is applied, which greatly promotes the diffusion flow of atoms at high temperature, and realizes welds with excellent characteristics and strength.

The present invention also provides a high-entropy alloy self-lubricating material and titanium alloy composite component prepared by the preparation method described in the above technical solution.

The present invention also provides the application of the high-entropy alloy self-lubricating material and titanium alloy composite component in the preparation of high-strength, tough and wear-resistant parts described in the technical solution. The high-strength and wear-resistant parts are preferably used in the aerospace field or the medical and civilian fields. The present invention does not have any special limitation on the application method, and it can be carried out by methods well known to those skilled in the art.

The high-entropy alloy self-lubricating material and titanium alloy composite component provided by the present invention and its preparation method and application will be described in detail below in conjunction with the examples, but they should not be understood as limiting the protection scope of the present invention.

Example 1

80 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe, with a particle size of 20 μm), 8 parts by weight of aluminum powder (with a particle size of 30 μm) and 12 parts by weight of silver powder (with a particle size of 15 μm) were mixed by ball milling After mixing evenly, carry out spark plasma sintering (the process of described spark plasma sintering is: under the pressure of 30MPa, rise to 950 ℃ with the rate of 10 ℃/min from room temperature, mold pressing 20min) as for graphite mould, drop to Room temperature, demoulding, to obtain high-entropy alloy self-lubricating composite materials;

Grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material respectively, to obtain the pretreated TC4 titanium alloy and the pretreated high-entropy alloy self-lubricating composite material;

Put the TC4 titanium alloy and high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumize, and carry out vacuum packaging to obtain a sheath for hot isostatic pressing;

After sandblasting the sheath, place it in hot isostatic pressing equipment for solid phase diffusion welding (the process is: increase the pressure to 10MPa at room temperature, raise the temperature to 600°C at a rate of 20°C/min, Insulate for 10 minutes, continue to raise the pressure to 40MPa, raise the temperature to 800℃ for the second time at a heating rate of 10℃/min, keep at the current pressure and temperature for 20min, increase the pressure to 100MPa, and increase the temperature at a heating rate of 10℃/min after holding the pressure After heating up to 1050°C for three times, heat preservation and pressure holding for 6 hours, and air cooling), the composite block in the sheath was taken out by machining, the cross-section was polished, and the interface was observed. The observation results are shown in Figure 1. From Figure 1, we can see that the The welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material is well combined, and it can be seen that an obvious transition layer is formed, and the transition layer is 2.5 μm thick;

The fiber hardness test is carried out on the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of the high-entropy alloy self-lubricating composite material side is 412HV, the hardness of the transition layer is 378HV, and the TC4 titanium alloy The side hardness of one side is 310HV;

Friction and wear tests were carried out at room temperature to analyze the friction and wear behavior of the material. The side friction coefficient of the high-entropy alloy self-lubricating composite material side was 0.35, and the wear rate was 3.3×10 ^-5 mm/(N·m).

Example 2

85 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe, with a particle size of 20 μm), 5 parts by weight of aluminum powder (with a particle size of 30 μm) and 10 parts by weight of silver powder (with a particle size of 15 μm) were ball milled and mixed After mixing evenly, carry out spark plasma sintering (the process of described spark plasma sintering is: under the pressure of 30MPa, rise to 950 ℃ with the rate of temperature rise of 10 ℃/min from room temperature, after mold pressing 20min) in graphite mould, drop To room temperature, demoulding, to obtain high-entropy alloy self-lubricating composite materials;

Grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material respectively, to obtain the pretreated TC4 titanium alloy and the pretreated high-entropy alloy self-lubricating composite material;

Put the TC4 titanium alloy and high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumize, and carry out vacuum packaging to obtain a sheath for hot isostatic pressing;

After sandblasting the sheath, place it in hot isostatic pressing equipment for solid phase diffusion welding (the process is: increase the pressure to 10MPa at room temperature, raise the temperature to 600°C at a rate of 20°C/min, Keep warm for 10 minutes, continue to raise the pressure to 40MPa, raise the temperature to 700℃ for the second time at a heating rate of 10℃/min, keep at the current pressure and temperature for 30min, increase the pressure to 110MPa, and then increase the temperature at a heating rate of 10℃/min After heating up to 1050°C for three times, heat preservation and pressure holding for 6 hours, and air cooling), the composite block in the sheath was taken out by machining, the cross-section was polished, and the interface was observed. The observation result was that the TC4 titanium alloy and the high-entropy alloy were The welding interface between the lubricating composite materials is well bonded, and it can be seen that an obvious transition layer is formed, and the thickness of the transition layer is 3 μm;

The fiber hardness test is carried out on the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of the high-entropy alloy self-lubricating composite material side is 396HV, the hardness of the transition layer is 368HV, and the TC4 titanium alloy The lateral hardness of one side is 306HV;

Friction and wear tests were carried out at room temperature to analyze the friction and wear behavior of the material. The side friction coefficient of the high-entropy alloy self-lubricating composite material side was 0.4, and the wear rate was 3.9×10 ^-5 mm/(N·m).

Example 3

80 parts by weight of high-entropy alloy powder (the composition of high-entropy alloy is CoCrNiFe, with a particle size of 30 μm), 8 parts by weight of aluminum powder (with a particle size of 30 μm) and 12 parts by weight of silver powder (with a particle size of 20 μm) were mixed by ball milling After mixing evenly, carry out spark plasma sintering (the process of described spark plasma sintering is: under the pressure of 30MPa, rise to 950 ℃ with the rate of temperature rise of 10 ℃/min from room temperature, after mold pressing 20min) in graphite mould, drop To room temperature, demoulding, to obtain high-entropy alloy self-lubricating composite materials;

Grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material respectively, to obtain the pretreated TC4 titanium alloy and the pretreated high-entropy alloy self-lubricating composite material;

Put the TC4 titanium alloy and high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumize, and carry out vacuum packaging to obtain a sheath for hot isostatic pressing;

After sandblasting the sheath, place it in hot isostatic pressing equipment for solid phase diffusion welding (the process is: increase the pressure to 10MPa at room temperature, raise the temperature to 600°C at a rate of 20°C/min, Insulate for 10 minutes, continue to increase the pressure to 40MPa, and raise the temperature to 800°C at a heating rate of 10°C/min for the second time, keep at the current pressure and temperature for 30 minutes, increase the pressure to 110MPa, and then increase the temperature at a heating rate of 10°C/min After heating up to 1100° C. for three times, heat preservation and pressure holding for 6 hours, and air cooling), the composite block in the sheath was taken out by machining, the cross section was polished, and the interface was observed. The observation result was that the TC4 titanium alloy and the high-entropy alloy were The welding interface between the lubricating composite materials (HEA/TC4 self-lubricating composite materials) is well bonded, and it can be seen that there is an obvious transition layer formed, and the transition layer is 2.8 μm thick;

The fiber hardness test is carried out on the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of the high-entropy alloy self-lubricating composite material side is 420HV, the hardness of the transition layer is 398HV, and the TC4 titanium alloy The side hardness of one side is 311HV;

Friction and wear tests were carried out at room temperature to analyze the friction and wear behavior of the material. The side friction coefficient of the high-entropy alloy self-lubricating composite material side was 0.35, and the wear rate was 3.0×10 ^-5 mm/(N·m).

Comparative example 1

Take TC4 titanium alloy as comparative example;

A room temperature friction and wear test was carried out on the TC4 titanium alloy to analyze the friction and wear behavior of the material. The friction coefficient was 0.7, and the wear rate was 9.1×10 ⁻³ mm/(N·m).

Comparative example 2

80 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe, with a particle size of 30 μm), 8 parts by weight of aluminum powder (with a particle size of 20 μm) and 12 parts by weight of silver powder (with a particle size of 20 μm) were ball milled and mixed After mixing evenly, carry out spark plasma sintering in the graphite mold (the process of the spark plasma sintering is: under the pressure of 30MPa, from room temperature to 950°C at a heating rate of 10°C/min, after molding for 20min), Cool down to room temperature, demold, and obtain the high-entropy alloy self-lubricating composite material;

Grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material respectively, to obtain the pretreated TC4 titanium alloy and the pretreated high-entropy alloy self-lubricating composite material;

Put the TC4 titanium alloy and high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumize, and carry out vacuum packaging to obtain a sheath for hot isostatic pressing;

After sandblasting the sheath, place it in hot isostatic pressing equipment for solid phase diffusion welding (the process is: increase the pressure to 10MPa at room temperature, raise the temperature to 600°C at a rate of 20°C/min, Insulate for 10 minutes, continue to increase the pressure to 40MPa, and raise the temperature to 800°C for the second time at a heating rate of 10°C/min. At the current pressure and temperature, keep it for 30 minutes, increase the pressure to 110MPa, keep the pressure for 6 hours, and use the machine The processing takes out the composite block in the sheath, grinds the cross section, and observes the interface. The observation results are as shown in Figure 2. As can be seen from Figure 2, the TC4 titanium alloy and high-entropy alloy self-lubricating composite (HEA/TC4 self-lubricating composite material (HEA/TC4 self-lubricating) Lubricating composite materials) between heterogeneous connection interfaces, no obvious transition layer is formed at the interface of the two alloys, and the bonding performance is weak.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A preparation method of a high-entropy alloy self-lubricating material and a titanium alloy composite member, characterized in that, comprising the following steps: After mixing medium-entropy alloy, aluminum and silver, spark plasma sintering is carried out to obtain high-entropy alloy self-lubricating material; After wrapping the high-entropy alloy self-lubricating material and titanium alloy, solid-phase diffusion welding is performed to obtain the high-entropy alloy self-lubricating material and titanium alloy composite component; The process of the solid phase diffusion welding process is as follows: boost the pressure to 10MPa at room temperature, raise the temperature to 600-750°C at a heating rate of 10-30°C/min, keep the temperature for 5-15min, and continue to increase the pressure to 30-40MPa to Heating rate of 8-10°C/min After second heating to 700-900°C, heat preservation and pressure holding for 15-30 minutes, after boosting to 80-110MPa, heating rate of 8-10°C/min three times to 1000-1200 ℃, heat preservation and pressure for 3~7h, air cooling. 2. The preparation method according to claim 1, characterized in that, the mass ratio of the medium entropy alloy, aluminum and silver is (75-85):(5-15):(5-15). 3. the preparation method as claimed in claim 1 or 2, is characterized in that, described entropy alloy is CoCrNiFe base entropy alloy; The titanium alloy is TC4 titanium alloy. 4. The preparation method according to claim 3, characterized in that, the particle size of the medium entropy alloy is 10-50 μm. 5. The preparation method according to claim 1 or 2, characterized in that, the particle size of the aluminum is 10-50 μm; The particle size of the silver is 15-35 μm. 6. The preparation method according to claim 1, characterized in that, the process of spark plasma sintering is: under the pressure of 20-40MPa, the temperature rises from room temperature to 700-700℃ at a heating rate of 8-10°C/min. 1000°C, molding for 10-20 minutes. 7. The preparation method according to claim 6, characterized in that, the process of spark plasma sintering is: under the pressure of 25-35 MPa, the temperature rises from room temperature to 900-900 °C at a rate of 8-10 °C/min. 1000°C, molding for 15-20 minutes. 8. The preparation method according to claim 1, characterized in that, the process of the solid phase diffusion welding treatment is: raising the pressure to 10 MPa at room temperature, and raising the temperature to 600-700 MPa at a heating rate of 15-25 °C/min. ℃, keep warm for 8-12min, continue to increase the pressure to 35-40MPa, heat up to 700-800℃ for the second time at a heating rate of 8-10℃/min, keep the temperature for 20-30min, and increase the pressure to 100-110MPa, Raise the temperature to 1050-1100°C three times at a heating rate of 8-10°C/min, hold the temperature and pressure for 5-6 hours, and cool in air. 9. The high-entropy alloy self-lubricating material and titanium alloy composite component prepared by the preparation method described in any one of claims 1-8. 10. The application of the high-entropy alloy self-lubricating material and titanium alloy composite member in the preparation of high-strength and wear-resistant parts according to claim 9.

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