CN115555561A - High-entropy alloy self-lubricating material and titanium alloy composite component and preparation method and application thereof - Google Patents
High-entropy alloy self-lubricating material and titanium alloy composite component and preparation method and application thereof Download PDFInfo
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- 241000196324 Embryophyta Species 0.000 description 1
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
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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 a preparation method and application thereof. The invention carries out solid phase diffusion welding treatment under the vacuum condition to realize heterogeneous connection between the titanium alloy and the high-entropy alloy self-lubricating material, obtains a joint with a welding interface reaching metallurgical bonding, compact structure and no defect, fully exerts respective advantages, can reduce friction coefficient and improve the wear resistance of the titanium alloy.
Description
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 a preparation method and application thereof.
Background
Titanium and titanium alloys have been highly valued and widely used in the aerospace field because of their excellent comprehensive mechanical properties. However, the wear resistance is not strong, and the oxidation resistance is obviously reduced along with the increase of the temperature, and particularly, the wear of wear-resistant parts such as aviation knuckle bearings becomes a main failure mode. The high-entropy alloy (HEA) has the performance superior to that of the traditional metal material, such as high strength, high wear resistance, good radiation resistance and the like, and becomes a leading edge and a hot spot of research in the field of alloys in recent years. The composite structural member composed of the titanium alloy/HEA dissimilar metal can combine the excellent performances of the titanium alloy and the HEA, so that the wear resistance of the part is improved on the basis of excellent mechanical properties.
Currently, few weldability studies of HEA with dissimilar materials are involved, mainly involving the dissimilar welding of mature HEA, such as cocrfermni and CoCrFeNiCu, with stainless steel. Researchers at the university of grapevine New Rich (J.P.Oliveira, jiania Shen, Z.Zeng, jeong Min Park, yeon Taek Choi, N.Schell, E.Maawad, N.Zhou, young shop Kim, dissimilar welding of a CoCrFeMnNi high entry alloy to 316stainless steel, script materialia, volume 206,2022, 114219) obtained flawless joints of CoCrFeMnNi and 316stainless steel using a laser welding process. The vacuum diffusion welding of CoCrFeNiCu and 304 stainless steel is researched by domestic CulAnie et al (CulAnie, zhao honglong, zhouyi, zhang Yingtai, qinqong, suzhongdong, coCrFeNiCu high-entropy alloy and 304 stainless steel vacuum diffusion welding, metal bulletin, 2021,57, 1567-1578), and the result shows that: the strength of the welding joint is higher than that of the base metal, and high-quality connection can be realized. Dissimilar welding with respect to titanium alloys is mainly focused on joining with stainless steel, copper, etc., but in dissimilar fusion welding processes, the mixing of two base materials may promote the formation of harmful phases, especially with titanium alloys, which are highly susceptible to the formation of a large amount of brittle intermetallic compounds during fusion welding, deteriorating the properties at the joint. Therefore, effectively preventing the generation of a large amount of intermetallic compounds is a difficult point of dissimilar welding, and the welding of HEA and titanium alloy has not been reported yet.
Disclosure of Invention
The invention aims to provide a high-entropy alloy self-lubricating material and titanium alloy composite member, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a high-entropy alloy self-lubricating material and titanium alloy composite member, which comprises the following steps:
mixing the medium-entropy alloy, aluminum and silver, and performing spark plasma sintering to obtain a high-entropy alloy self-lubricating material;
after the high-entropy alloy self-lubricating material and the titanium alloy are sheathed, carrying out solid-phase diffusion welding treatment to obtain a high-entropy alloy self-lubricating material and titanium alloy composite component;
the solid phase diffusion welding treatment process comprises the following steps: increasing the pressure to 10MPa at room temperature, increasing the temperature to 600-750 ℃ at the heating rate of 10-30 ℃/min, preserving the heat for 5-15 min, continuously increasing the pressure to 30-40 MPa, secondarily increasing the temperature to 700-900 ℃ at the heating rate of 8-10 ℃/min, preserving the heat and pressure for 15-30 min, increasing the pressure to 80-110 MPa, thirdly increasing the temperature to 1000-1200 ℃ at the heating rate of 8-10 ℃/min, preserving the heat and pressure for 3-7 h, and air cooling.
Preferably, the mass ratio of the medium entropy alloy to the aluminum to the 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 to 50 μm;
the grain diameter of the silver is 15-35 mu m.
Preferably, the spark plasma sintering process is as follows: under the pressure of 20-40 MPa, the temperature is raised from room temperature to 700-1000 ℃ at the heating rate of 8-10 ℃/min, and the mould pressing is carried out for 10-20 min.
Preferably, the spark plasma sintering process is as follows: under the pressure of 25-35 MPa, the temperature is raised from room temperature to 900-1000 ℃ at the temperature raising rate of 8-10 ℃/min, and the mould pressing is carried out for 15-20 min.
Preferably, the solid phase diffusion welding process comprises the following steps: increasing the pressure to 10MPa at room temperature, increasing the temperature to 600-700 ℃ at the temperature rising rate of 15-25 ℃/min, preserving the heat for 8-12 min, continuously increasing the pressure to 35-40 MPa, secondarily increasing the temperature to 700-800 ℃ at the temperature rising rate of 8-10 ℃/min, preserving the heat and pressure for 20-30 min, increasing the pressure to 100-110 MPa, thirdly increasing the temperature to 1050-1100 ℃ at the temperature rising rate of 8-10 ℃/min, preserving the heat and pressure for 5-6 h, and air cooling.
The invention also provides the high-entropy alloy self-lubricating material and the titanium alloy composite component prepared by the preparation method in the technical scheme.
The invention also provides application of the high-entropy alloy self-lubricating material and the titanium alloy composite member in the technical scheme in preparation of high-toughness and wear-resistant parts.
The invention provides a preparation method of a high-entropy alloy self-lubricating material and titanium alloy composite member, which comprises the following steps: mixing the medium-entropy alloy, aluminum and silver, and then performing discharge plasma sintering to obtain a high-entropy alloy self-lubricating material; after the high-entropy alloy self-lubricating material and the titanium alloy are sheathed, carrying out solid-phase diffusion welding treatment under a vacuum condition to obtain a high-entropy alloy self-lubricating material and titanium alloy composite component; the solid phase diffusion welding treatment process comprises the following steps: boosting the pressure to 10MPa at room temperature, raising the temperature to 600-750 ℃ at the heating rate of 10-30 ℃/min, preserving the heat for 5-15 min, continuing boosting the pressure to 30-40 MPa, raising the temperature to 700-900 ℃ at the heating rate of 8-10 ℃/min for two times, preserving the heat and pressure for 15-30 min, raising the pressure to 80-110 MPa, raising the temperature to 1000-1200 ℃ at the heating rate of 8-10 ℃/min for three times, preserving the heat and pressure for 3-7 h, and air cooling. The invention carries out solid phase diffusion welding treatment to enable the titanium alloy and the high-entropy alloy self-lubricating material to be in initial physical contact, then the surface is subjected to plastic deformation through yield and creep mechanism under the action of high temperature and external pressure, the contact area of the surface is gradually increased, atoms of the contact surface are mutually diffused to form tight combination, the interface atoms are in a highly activated state due to the defects of lattice distortion, dislocation, vacancy and the like caused by the deformation, the tissue components are gradually homogenized, the original interface disappears, the heterogeneous connection is realized, the metallurgical combination of the welding interface is obtained, the joint with compact structure and no defects is obtained, the advantages of the welding interface are fully exerted, the friction coefficient can be reduced, and the wear resistance of the titanium alloy is improved.
Drawings
FIG. 1 is an SEM image of a HEA/TC4 self-lubricating composite material of example 1;
FIG. 2 is an SEM image of the HEA/TC4 self-lubricating composite material of comparative example 2.
Detailed Description
The invention provides a preparation method of a high-entropy alloy self-lubricating material and titanium alloy composite member, which comprises the following steps:
mixing the medium-entropy alloy, aluminum and silver, and performing spark plasma sintering to obtain a high-entropy alloy self-lubricating material;
after the high-entropy alloy self-lubricating material and the titanium alloy are sheathed, carrying out solid-phase diffusion welding treatment to obtain a high-entropy alloy self-lubricating material and titanium alloy composite component;
the solid phase diffusion welding treatment process comprises the following steps: boosting the pressure to 10MPa at room temperature, raising the temperature to 600-750 ℃ at the heating rate of 10-30 ℃/min, preserving the heat for 5-15 min, continuing boosting the pressure to 30-40 MPa, raising the temperature to 700-900 ℃ at the heating rate of 8-10 ℃/min for two times, preserving the heat and pressure for 15-30 min, raising the pressure to 80-110 MPa, raising the temperature to 1000-1200 ℃ at the heating rate of 8-10 ℃/min for three times, preserving the heat and pressure for 3-7 h, and air cooling.
In the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.
The high-entropy alloy self-lubricating material is obtained by mixing the medium-entropy alloy, aluminum and silver and then performing spark plasma sintering.
In the 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 grain diameter of the high-entropy alloy is preferably 10-50 μm.
In the present invention, the particle size of the aluminum is preferably 10 to 50 μm.
In the present invention, the particle size of the silver is preferably 15 to 35 μm.
In the present invention, the mass ratio of the high-entropy alloy, aluminum and silver is preferably (75 to 85): (5-15): (5 to 15), more preferably (78 to 82): (8-12): (8 to 12).
In the present invention, the silver functions as a solid lubricant, and the aluminum functions to realize the production of Al having a different Al content from that of CoCrNiFe x CoCrNiFe quinary high-entropy alloy.
In the invention, the mixing mode is preferably ball milling, the ball milling process is not limited in any way, and the process known to those skilled in the art is adopted to ensure that the high-entropy alloy, the aluminum and the silver are mixed uniformly.
In the present invention, the spark plasma sintering process is preferably: under the pressure of 20-40 MPa, the temperature is raised from room temperature to 700-1000 ℃ at the temperature rise rate of 8-10 ℃/min, and the mould pressing is carried out for 10-20 min; more preferably, the temperature is increased from room temperature to 900-1000 ℃ at the temperature-increasing rate of 8-10 ℃/min under the pressure of 25-35 MPa, and the die pressing is carried out for 15-20 min.
In the present invention, the spark plasma sintering is preferably performed by placing the mixture obtained by the mixing in a graphite mold.
In the present invention, the discharge plasma sintering functions to realize Al x And (3) preparing the CoCrNiFe-based high-entropy alloy self-lubricating composite material.
After the spark plasma sintering is finished, the invention also comprises the steps of cooling and demoulding which are sequentially carried out; the process of cooling is not limited in any way, and the temperature is reduced to room temperature by adopting a process well known by the technical personnel in the field; the demolding process is not particularly limited in the present invention, and may be performed by a process known to those skilled in the art.
After the high-entropy alloy self-lubricating material is obtained, the high-entropy alloy self-lubricating material and the titanium alloy are sheathed, and then solid-phase diffusion welding treatment is carried out, so that the high-entropy alloy self-lubricating material and titanium alloy composite component is obtained.
In the present invention, the titanium alloy is preferably a TC4 titanium alloy, and the chemical composition of the TC4 titanium alloy is preferably Ti 6 Al 4 V。
Before sheath, the high-entropy alloy self-lubricating material and the titanium alloy are preferably pretreated respectively, and the pretreatment preferably comprises grinding and polishing which are sequentially carried out; the present invention does not have any particular limitation on the grinding and polishing process, and may be performed by a process well known to those skilled in the art.
In the invention, the process of the sheath is preferably to place the high-entropy alloy self-lubricating material and the titanium alloy in a carbon steel sheath, vacuumize the sheath, and package the sheath in vacuum to obtain the sheath for hot isostatic pressing treatment. The process of the vacuum pumping is not limited in any way, and can be performed by adopting a process known by a person skilled in the art.
After obtaining the capsule for hot isostatic pressing, the invention preferably further comprises sand blasting the obtained capsule. The process of the sand blasting treatment is not limited in any way, and can be performed by a process known to those skilled in the art. In the present invention, the purpose of said sandblasting treatment is to remove the greasy dirt from the surface of the sheath in order to contaminate the furnace chamber of the plant furnace.
In the present invention, the solid phase diffusion welding process comprises: boosting the pressure to 10MPa at room temperature, raising the temperature to 600-750 ℃ at the heating rate of 10-30 ℃/min, preserving the heat for 5-15 min, continuing boosting the pressure to 30-40 MPa, raising the temperature to 700-900 ℃ at the heating rate of 8-10 ℃/min for two times, preserving the heat and pressure for 15-30 min, raising the pressure to 80-110 MPa, raising the temperature to 1000-1200 ℃ at the heating rate of 8-10 ℃/min for three times, preserving the heat and pressure for 3-7 h, and air cooling; preferably, the pressure is increased to 10MPa at room temperature, the temperature is increased to 600-700 ℃ at the temperature increase rate of 15-25 ℃/min, the temperature is kept for 8-12 min, the pressure is continuously increased to 35-40 MPa, the temperature is secondarily increased to 700-800 ℃ at the temperature increase rate of 8-10 ℃/min, the temperature and the pressure are kept for 20-30 min, the temperature is increased to 1050-1100 ℃ at the temperature increase rate of 8-10 ℃/min for three times after the pressure is increased to 100-110 MPa, the temperature and the pressure are kept for 5-6 h, and air cooling is carried out.
In the present invention, the solid phase diffusion welding process is preferably performed in a hot isostatic pressing apparatus.
In the present invention, the control of the condition parameters of the solid phase diffusion welding treatment within the above ranges has the effects of allowing the high-entropy alloy self-lubricating composite material and the titanium alloy dissimilar interface to be in contact with each other without a gap, hardly causing significant plastic deformation and oxidation at the metal joint, increasing the contact area after applying pressure, greatly promoting diffusion flow of atoms at high temperature, and realizing a weld having excellent characteristics and strength.
The invention also provides the high-entropy alloy self-lubricating material and the titanium alloy composite component prepared by the preparation method in the technical scheme.
The invention also provides application of the high-entropy alloy self-lubricating material and the titanium alloy composite member in the technical scheme in preparation of high-toughness and wear-resistant parts. The high-toughness and wear-resistant part is preferably used in the aerospace field or the medical civil field. The method of the present invention is not particularly limited, and the method may be performed by a method known to those skilled in the art.
The high-entropy alloy self-lubricating material and titanium alloy composite member provided by the invention and the preparation method and application thereof are described in detail below with reference to the examples, but the invention is not to be construed as limiting the scope of the invention.
Example 1
Ball-milling and mixing 80 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe with the particle size of 20 microns), 8 parts by weight of aluminum powder (the particle size is 30 microns) and 12 parts by weight of silver powder (the particle size is 15 microns) until the mixture is uniform, placing the mixture into a graphite die for spark plasma sintering (the process of the spark plasma sintering is that under the pressure of 30MPa, the room temperature is increased to 950 ℃ at the speed of 10 ℃/min, the die pressing is carried out for 20 min), then cooling to the room temperature, and demoulding to obtain the high-entropy alloy self-lubricating composite material;
respectively grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material to obtain a pretreated TC4 titanium alloy and a pretreated high-entropy alloy self-lubricating composite material;
placing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumizing, and carrying out vacuum packaging to obtain the sheath for hot isostatic pressing treatment;
after sand blasting is carried out on the sheath, the sheath is placed in hot isostatic pressing equipment for solid phase diffusion welding treatment (the process is that the pressure is increased to 10MPa at room temperature, the temperature is increased to 600 ℃ at the heating rate of 20 ℃/min, the temperature is kept for 10min, the pressure is continuously increased to 40MPa, the temperature is increased to 800 ℃ at the heating rate of 10 ℃/min twice, the pressure is kept for 20min and 100MPa at the current pressure and temperature, the temperature is increased to 1050 ℃ at the heating rate of 10 ℃/min three times after pressure maintaining, the temperature and pressure are kept for 6h, and air cooling is carried out), then the composite block in the sheath is taken out by machining, the cross section is polished, the interface is observed, the observation result is shown in figure 1, as can be seen from figure 1, the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material is well combined, an obvious transition layer can be observed, and the thickness of the transition layer is 2.5 mu m;
carrying out fiber hardness test on a welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of one side of the high-entropy alloy self-lubricating composite material is 412HV, the hardness of a transition layer is 378HV, and the side hardness of one side of the TC4 titanium alloy is 310HV;
performing a friction and wear test at room temperature, analyzing the friction and wear behavior of the material, wherein the lateral friction coefficient of the high-entropy alloy self-lubricating composite material side is 0.35, and the wear rate is 3.3 multiplied by 10 -5 mm/(N·m)。
Example 2
Ball-milling and mixing 85 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe with the particle size of 20 microns), 5 parts by weight of aluminum powder (the particle size is 30 microns) and 10 parts by weight of silver powder (the particle size is 15 microns) until the mixture is uniform, placing the mixture into a graphite die for spark plasma sintering (the process of the spark plasma sintering is that under the pressure of 30MPa, the temperature is increased to 950 ℃ from the room temperature at the heating rate of 10 ℃/min, the die pressing is carried out for 20 min), then cooling to the room temperature, and demoulding to obtain the high-entropy alloy self-lubricating composite material;
respectively grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material to obtain a pretreated TC4 titanium alloy and a pretreated high-entropy alloy self-lubricating composite material;
placing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumizing, and carrying out vacuum packaging to obtain the sheath for hot isostatic pressing treatment;
after carrying out sand blasting on the sheath, placing the sheath in hot isostatic pressing equipment for solid-phase diffusion welding treatment (the process is that the pressure is increased to 10MPa at room temperature, the temperature is increased to 600 ℃ at the heating rate of 20 ℃/min, the temperature is kept for 10min, the pressure is continuously increased to 40MPa, the temperature is increased to 700 ℃ at the heating rate of 10 ℃/min twice, the pressure is kept for 30min and 110MPa at the current pressure and temperature, the temperature is increased to 1050 ℃ at the heating rate of 10 ℃/min three times after pressure maintaining, the temperature and the pressure are kept for 6h, and air cooling is carried out), taking out the composite block in the sheath by machining, polishing the cross section, observing the interface, wherein the observation result is that the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material is well combined, an obvious transition layer can be observed to be generated, and the thickness of the transition layer is 3 mu m;
carrying out fiber hardness test on a welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of one side of the high-entropy alloy self-lubricating composite material is 396HV, the hardness of a transition layer is 368HV, and the side hardness of one side of the TC4 titanium alloy is 306HV;
performing a friction and wear test at room temperature, analyzing the friction and wear behavior of the material, wherein the lateral friction coefficient of the high-entropy alloy self-lubricating composite material side is 0.4, and the wear rate is 3.9 multiplied by 10 -5 mm/(N·m)。
Example 3
Ball-milling 80 parts by weight of high-entropy alloy powder (the high-entropy alloy is CoCrNiFe with the grain diameter of 30 mu m), 8 parts by weight of aluminum powder (the grain diameter of 30 mu m) and 12 parts by weight of silver powder (the grain diameter of 20 mu m) until the mixture is uniform, placing the mixture into a graphite die for spark plasma sintering (the process of the spark plasma sintering is that under the pressure of 30MPa, the temperature is increased to 950 ℃ from room temperature at the heating rate of 10 ℃/min, the die pressing is carried out for 20 min), then the temperature is reduced to room temperature, and the die is removed, so that the high-entropy alloy self-lubricating composite material is obtained;
respectively grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material to obtain a pretreated TC4 titanium alloy and a pretreated high-entropy alloy self-lubricating composite material;
placing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumizing, and carrying out vacuum packaging to obtain the sheath for hot isostatic pressing treatment;
after sand blasting is carried out on the sheath, the sheath is placed in hot isostatic pressing equipment for solid phase diffusion welding treatment (the process is that the pressure is increased to 10MPa at room temperature, the temperature is increased to 600 ℃ at the heating rate of 20 ℃/min, the temperature is kept for 10min, the pressure is continuously increased to 40MPa, the temperature is increased to 800 ℃ at the heating rate of 10 ℃/min, the pressure is maintained for 30min to 110MPa at the current pressure and temperature, the temperature is increased to 1100 ℃ at the heating rate of 10 ℃/min after pressure maintaining, the temperature and the pressure are kept for 6h, air cooling is carried out), then the composite block in the sheath is taken out by machining, the cross section is polished, the interface is observed, the observation result is that the welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material (HEA/TC 4 self-lubricating composite material) is well combined, an obvious transition layer can be observed, and the thickness of the transition layer is 2.8 mu m;
carrying out a fiber hardness test on a welding interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material, wherein the side hardness of one side of the high-entropy alloy self-lubricating composite material is 420HV, the hardness of a transition layer is 398HV, and the side hardness of one side of the TC4 titanium alloy is 311HV;
performing a friction and wear test at room temperature, analyzing the friction and wear behavior of the material, wherein the lateral friction coefficient of the high-entropy alloy self-lubricating composite material side is 0.35, and the wear rate is 3.0 multiplied by 10 -5 mm/(N·m)。
Comparative example 1
The TC4 titanium alloy is taken as a comparative example;
the TC4 titanium alloy is subjected to a room temperature friction wear test, the friction wear behavior of the material is analyzed, the friction coefficient is 0.7, and the wear rate is 9.1 multiplied by 10 -3 mm/(N·m)。
Comparative example 2
Ball-milling and mixing 80 parts by weight of high-entropy alloy powder (the composition of the high-entropy alloy is CoCrNiFe with the particle size of 30 mu m), 8 parts by weight of aluminum powder (the particle size is 20 mu m) and 12 parts by weight of silver powder (the particle size is 20 mu m) until the mixture is uniform, placing the mixture into a graphite die for spark plasma sintering (the process of the spark plasma sintering is that under the pressure of 30MPa, the temperature is raised to 950 ℃ from room temperature at the heating rate of 10 ℃/min, the die pressing is carried out for 20 min), then cooling to room temperature, and demoulding to obtain the high-entropy alloy self-lubricating composite material;
respectively grinding and polishing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material to obtain a pretreated TC4 titanium alloy and a pretreated high-entropy alloy self-lubricating composite material;
placing the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material in a carbon steel sheath, vacuumizing, and carrying out vacuum packaging to obtain the sheath for hot isostatic pressing treatment;
after sand blasting is carried out on the sheath, the sheath is placed in hot isostatic pressing equipment for solid phase diffusion welding treatment (the process is that the pressure is increased to 10MPa at room temperature, the temperature is increased to 600 ℃ at the heating rate of 20 ℃/min, the temperature is kept for 10min, the pressure is continuously increased to 40MPa, the temperature is increased to 800 ℃ at the heating rate of 10 ℃/min, the temperature is kept for 30min and is increased to 110MPa at the current pressure and temperature, the temperature and the pressure are kept for 6h, and air cooling is carried out), then the composite block in the sheath is taken out by utilizing machining, the cross section is polished, the interface is observed, the observation result is shown in figure 2, and as can be seen from figure 2, a heterogeneous connection interface between the TC4 titanium alloy and the high-entropy alloy self-lubricating composite material (HEA/TC 4 self-lubricating composite material) is formed, no obvious transition layer is formed at the interface of the two alloys, and the bonding performance is weak.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also 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 titanium alloy composite component is characterized by comprising the following steps:
mixing the medium-entropy alloy, aluminum and silver, and performing spark plasma sintering to obtain a high-entropy alloy self-lubricating material;
after the high-entropy alloy self-lubricating material and the titanium alloy are sheathed, carrying out solid-phase diffusion welding treatment to obtain a high-entropy alloy self-lubricating material and titanium alloy composite component;
the solid phase diffusion welding treatment process comprises the following steps: increasing the pressure to 10MPa at room temperature, increasing the temperature to 600-750 ℃ at the temperature increase rate of 10-30 ℃/min, preserving the heat for 5-15 min, continuously increasing the pressure to 30-40 MPa, secondarily increasing the temperature to 700-900 ℃ at the temperature increase rate of 8-10 ℃/min, preserving the heat and pressure for 15-30 min, increasing the pressure to 80-110 MPa, thirdly increasing the temperature to 1000-1200 ℃ at the temperature increase rate of 8-10 ℃/min, preserving the heat and pressure for 3-7 h, and air cooling.
2. The preparation method according to claim 1, wherein the mass ratio of the medium-entropy alloy to the aluminum to the silver is (75-85): (5-15): (5-15).
3. The production method according to claim 1 or 2, wherein the medium entropy alloy is a CoCrNiFe-based medium entropy alloy;
the titanium alloy is TC4 titanium alloy.
4. The method according to claim 3, wherein the grain size of the medium entropy alloy is 10 to 50 μm.
5. The production method according to claim 1 or 2, wherein the particle size of the aluminum is 10 to 50 μm;
the grain diameter of the silver is 15-35 mu m.
6. The method of claim 1, wherein the spark plasma sintering comprises: under the pressure of 20-40 MPa, the temperature is raised from room temperature to 700-1000 ℃ at the temperature rise rate of 8-10 ℃/min, and the mould pressing is carried out for 10-20 min.
7. The method of claim 6, wherein the spark plasma sintering comprises: under the pressure of 25-35 MPa, the temperature is raised from room temperature to 900-1000 ℃ at the temperature raising rate of 8-10 ℃/min, and the mould pressing is carried out for 15-20 min.
8. The method of claim 1, wherein the solid phase diffusion welding process is performed by: increasing the pressure to 10MPa at room temperature, increasing the temperature to 600-700 ℃ at the temperature rising rate of 15-25 ℃/min, preserving the heat for 8-12 min, continuously increasing the pressure to 35-40 MPa, secondarily increasing the temperature to 700-800 ℃ at the temperature rising rate of 8-10 ℃/min, preserving the heat and pressure for 20-30 min, increasing the pressure to 100-110 MPa, thirdly increasing the temperature to 1050-1100 ℃ at the temperature rising rate of 8-10 ℃/min, preserving the heat and pressure for 5-6 h, and air cooling.
9. The high-entropy alloy self-lubricating material and titanium alloy composite member prepared by the preparation method of any one of claims 1 to 8.
10. The use of the high-entropy alloy self-lubricating material and the titanium alloy composite member in the preparation of high-toughness and wear-resistant parts according to claim 9.
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