High-entropy alloy composite ceramic reinforced regenerated aluminum alloy and preparation method thereof

Abstract

The invention provides a high-entropy alloy composite ceramic reinforced regenerated aluminum alloy, the regenerated aluminum alloy is composed of a matrix material and a reinforced phase, the matrix material is regenerated aluminum, the reinforced phase is composed of a high-entropy alloy and a three-dimensional porous ceramic material, and the high-entropy alloy is uniformly distributed on the three-dimensional porous ceramic material. According to the method, the high-entropy alloy and the ceramic powder are compounded to prepare the porous reinforced phase, the reinforced phase can be uniformly and stably distributed in the regenerated aluminum alloy matrix, and the mechanical property of the regenerated aluminum alloy matrix is improved.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloys, and in particular to a high-entropy alloy composite ceramic reinforced recycled aluminum alloy and a preparation method thereof. Background Art

[0002] Recycled aluminum alloys have become an important development direction for the aluminum industry due to their environmental friendliness and resource recycling advantages. Due to the complex sources of recycled aluminum, there are common problems such as enrichment of impurity elements (Fe, Si, etc.), uneven structure, and large fluctuations in mechanical properties, which seriously restrict its application in high-end structural parts. Although traditional reinforcement methods (such as single ceramic particles or intermetallic compounds) can improve strength, they face two major bottlenecks: First, poor interface compatibility: ceramic particles (SiC, Al2O3, etc.) have insufficient wettability with the aluminum matrix, and are prone to forming a weak bonding interface, resulting in stress concentration and reduced toughness; second, strong impurity sensitivity: impurities such as Fe and Si in recycled aluminum are prone to forming coarse brittle phases (such as β-Al5FeSi), which weaken the reinforcement effect and induce cracks. High-entropy alloys (HEAs) are a class of alloy materials composed of five or more primary elements in near-equiatomic ratios. Their unique composition and structure endow them with numerous exceptional properties, such as high strength, high hardness, and excellent wear and corrosion resistance. The synergistic effect of the various elements in HEAs produces a complex phase structure and lattice distortion, significantly enhancing the mechanical properties of the material. Furthermore, HEAs exhibit excellent thermal stability and oxidation resistance, enabling them to maintain excellent performance even at high temperatures. Three-dimensional porous ceramics possess a unique porous structure that not only reduces weight but also provides excellent thermal insulation, sound insulation, and vibration damping. The pore structure of porous ceramics acts as a stress buffer, dissipating stress and thereby improving the fatigue resistance of composite materials. Furthermore, the high specific surface area of ​​porous ceramics enhances the interfacial bonding between the phase and the matrix, further enhancing the performance of the composite. Combining HEAs with three-dimensional porous ceramics and introducing them as a reinforcing phase into recycled aluminum alloys promises to leverage the advantages of both HEAs and porous ceramics, significantly improving the performance of recycled aluminum alloys and holding broad application prospects in the field of high-performance materials. Summary of the Invention

[0003] Technical problem to be solved: The purpose of the present invention is to provide a high entropy alloy composite ceramic reinforced recycled aluminum alloy, and the high entropy alloy and ceramic powder are composited to prepare a porous reinforcement phase, which can be evenly and stably distributed in the recycled aluminum alloy matrix, thereby improving the mechanical properties of the recycled aluminum alloy matrix.

[0004] Technical solution: A high-entropy alloy composite ceramic reinforced recycled aluminum alloy, the recycled aluminum alloy consists of a matrix material and a reinforcement phase, the matrix material is recycled aluminum, the reinforcement phase consists of a high-entropy alloy and a three-dimensional porous ceramic material, and the high-entropy alloy is uniformly distributed on the three-dimensional porous ceramic material. Preferably, the high entropy alloy in the reinforcement phase is Al 20 Cu 20 Fe 20 Mn 20 Ni 20 , the three-dimensional porous ceramics in the reinforcement phase are SiC porous ceramics. Preferably, the preparation method of the reinforcing phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles are dispersed in anhydrous ethanol and uniformly dispersed by ultrasonication to obtain a silicon carbide dispersion; S12. PVP is added to ethanol to form a PVP solution; S13. PS microspheres were added to the PVP solution and stirred to mix thoroughly. Then, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution and stirred to mix thoroughly to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt were mixed in equal volumes and dried, sintered under air conditions, and then sintered at a constant temperature under nitrogen conditions to obtain a reinforced phase. Preferably, in step S11, the mass-to-volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol is 3-6 g:3-6 g:100 mL. Preferably, the concentration of the PVP solution in step S12 is 8-12 wt %. Preferably, in step S13, the particle size of the PS microspheres is 1.5 mm, the mass ratio of the PS microspheres to the PVP solution is 1-2:10, and the concentration of citric acid in the PVP solution is 1-2 mol / L. Preferably, in step S14, the sintering temperature under air conditions is 250-300° C., and the time is 1.5-3 hours; the constant temperature sintering temperature under nitrogen conditions is 900-1020° C., and the time is 3-5 hours. The method for preparing the high entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1-2.1%; Fe: 0.35-0.9%; Mg: 0.17-0.3%; Zn: 0.05-0.1%; Mn: 0.1-0.5%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. Add the reinforcing phase to the extrusion device, heat the extrusion device, pour the aluminum alloy liquid into the extrusion device, pressurize the extrusion device, maintain the pressure until the aluminum alloy liquid solidifies, and perform heat treatment after solidification to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy. Preferably, the pressurized pressure is 45-75 MPa. Preferably, the heat treatment is first solution treatment and then artificial aging, the solution treatment temperature is 530-535° C., the time is 3-3.5 hours, and the artificial aging temperature is 180-190° C., the time is 8-10 hours. Beneficial effects: The high entropy alloy composite ceramic reinforced recycled aluminum alloy of the present invention has the following advantages: 1. The present invention uses high-entropy alloy components and SiC nanopowder to prepare a composite reinforcement phase. The synergistic effect of the reinforcement phase and the aluminum alloy matrix enables the material to better disperse stress when subjected to external forces, reducing stress concentration points, thereby effectively improving the overall mechanical properties of the material; 2. In the present invention, silicon carbide nanowires and nanoparticles are dispersed in anhydrous ethanol, and then mixed with a PVP solution containing metal salts and sintered to prepare a composite reinforcement phase in which a high entropy alloy component is uniformly loaded on the SiC bracket. This uniformly distributed reinforcement phase can avoid the stress concentration problem caused by excessive concentration of the local reinforcement phase, thereby improving the overall performance of the material; 3. In the present invention, high entropy alloy and SiC are used to form a composite porous bracket, rather than using high entropy alloy particles and bracket materials to be composited separately. This is because if the high entropy alloy and SiC ceramics are in physical contact, combined with weak load, the present invention chooses to mix the metal salt precursor with the SiC nanomaterial at the molecular level, and realize atomic-level composite through simultaneous sintering. The solution impregnation method can allow the metal elements to fill the nano-scale pores of the SiC, and the interface bonding strength between the reinforcement phase and the matrix material is improved. DETAILED DESCRIPTION The present invention will be further described below in conjunction with examples, which are provided to explain the present invention and are not limited to the following examples: Example 1 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1%; Fe: 0.9%; Mg: 0.17%; Zn: 0.05%; Mn: 0.5%; the balance is Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain an aluminum alloy liquid; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 45 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 hours and the artificial aging temperature is 180 ° C for 10 hours to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 3g:6g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 8 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm and the mass ratio of the PS microspheres to the PVP solution was 2:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 2 mol / L. The mixture was stirred and mixed to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 300°C for 1.5 hours, and then sintered in nitrogen at a constant temperature of 900°C for 5 hours to obtain a reinforcement phase. Example 2 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1%; Fe: 0.35%; Mg: 0.3%; Zn: 0.1%; Mn: 0.1%; the balance is Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain an aluminum alloy liquid; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 75 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 530 ° C for 3.5 h and the artificial aging temperature is 190 ° C for 8 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 6g:3g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form a 12 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm and the mass ratio of the PS microspheres to the PVP solution was 1:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1 mol / L. The mixture was stirred and mixed to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 250°C for 3 hours, and then sintered at a constant temperature of 1020°C for 3 hours under nitrogen to obtain a reinforcement phase. Example 3 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.5%; Fe: 0.55%; Mg: 0.22%; Zn: 0.1%; Mn: 0.2%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain an aluminum alloy liquid; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 55 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3.5 h and the artificial aging temperature is 180 ° C for 10 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4g:5g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form a 9 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm, and the mass ratio of the PS microspheres to the PVP solution was 1.2:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.7 mol / L. After stirring and mixing, a PVP solution containing metal salts was obtained. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered under air at a temperature of 260°C for 2.5 hours, and then sintered under nitrogen at a constant temperature of 940°C for 3.5 hours to obtain a reinforcement phase. Example 4 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.9%; Fe: 0.7%; Mg: 0.28%; Zn: 0.05%; Mn: 0.4%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 65 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 530 ° C for 3 h and the artificial aging temperature is 190 ° C for 8 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4g:4g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm, and the mass ratio of the PS microspheres to the PVP solution was 1.5:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.2 mol / L. After stirring and mixing, a PVP solution containing metal salts was obtained. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 280°C for 2 hours, and then sintered in nitrogen at a constant temperature of 1000°C for 4.5 hours to obtain a reinforcement phase. Example 5 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.6%; Fe: 0.6%; Mg: 0.25%; Zn: 0.08%; Mn: 0.3%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 60 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 h and the artificial aging temperature is 185 ° C for 9 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4.5g:4.5g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm and the mass ratio of the PS microspheres to the PVP solution was 2:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.5 mol / L. The mixture was stirred and mixed to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt were mixed in equal volumes and dried. The mixture was sintered under air at a temperature of 270°C for 2.2 hours. The mixture was then placed under nitrogen and sintered at a constant temperature of 980°C for 4 hours to obtain a reinforcement phase. Comparative Example 1 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.9%; Fe: 0.7%; Mg: 0.28%; Zn: 0.05%; Mn: 0.4%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 65 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 530 ° C for 3 h and the artificial aging temperature is 190 ° C for 8 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4g:4g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm, and the mass ratio of the PS microspheres to the PVP solution was 1.5:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.2 mol / L. After stirring and mixing, a PVP solution containing metal salts was obtained. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 280°C for 2 hours, and then sintered in nitrogen at a constant temperature of 1000°C for 4.5 hours to obtain a reinforcement phase. Example 5 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.6%; Fe: 0.6%; Mg: 0.25%; Zn: 0.08%; Mn: 0.3%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 60 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 h and the artificial aging temperature is 185 ° C for 9 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4.5g:4.5g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13. PS microspheres were added to the PVP solution, wherein the particle size of the PS microspheres was 1.5 mm, and the mass ratio of the PS microspheres to the PVP solution was 1.8:10. After stirring and mixing, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.2 mol / L. The mixture was stirred and mixed to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 280°C for 2 hours, and then sintered at a constant temperature of 980°C for 4.5 hours under nitrogen to obtain a reinforcement phase. Comparative Example 1 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.6%; Fe: 0.6%; Mg: 0.25%; Zn: 0.08%; Mn: 0.3%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 60 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 h and the artificial aging temperature is 185 ° C for 9 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4.5g:4.5g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13 PS microspheres were added to the PVP solution, the particle size of the PS microspheres was 1.5 mm, the mass ratio of PS microspheres to PVP solution was 2:10, and the mixture was stirred to obtain a PS-containing PVP solution; S14. The silicon carbide dispersion and the PS-containing PVP solution were mixed in equal volumes and dried. The mixture was sintered in air at 270°C for 2.2 hours. The mixture was then sintered at a constant temperature of 980°C for 4 hours under nitrogen to obtain a reinforcement phase. Comparative Example 2 A method for preparing an alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.6%; Fe: 0.6%; Mg: 0.25%; Zn: 0.08%; Mn: 0.3%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized at a pressure of 60 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 h and the artificial aging temperature is 185 ° C for 9 h to obtain an alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles were dispersed in anhydrous ethanol, the mass volume ratio of silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol was 4.5g:4.5g:100mL, and after ultrasonic dispersion, a silicon carbide dispersion was obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13. PS microspheres were added to the PVP solution. The particle size of the PS microspheres was 1.5 mm. The mass ratio of the PS microspheres to the PVP solution was 1.8:10. After stirring and mixing, equimolar amounts of citric acid, Cu(NO3)2, FeCl3·6H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution. The concentration of citric acid in the PVP solution was 1.2 mol / L. The mixture was stirred and mixed to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried. The mixture is sintered in air at a temperature of 280°C for 2 hours, and then sintered at a constant temperature of 980°C for 4.5 hours under nitrogen to obtain a reinforcement phase. Comparative Example 3 A method for preparing a high-entropy alloy composite ceramic reinforced recycled aluminum alloy comprises the following steps: S1. Recycled aluminum scrap and pure aluminum are mixed, and the types and mass percentages of the elements satisfy the following: Si: 1.6%; Fe: 0.6%; Mg: 0.25%; Zn: 0.08%; Mn: 0.3%; the balance being Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain a molten aluminum alloy; S2. The reinforcing phase is added to the extrusion device, the extrusion device is heated, and the aluminum alloy liquid is poured into the extrusion device, and the extrusion device is pressurized to 60 MPa. The pressure is maintained until the aluminum alloy liquid solidifies. After solidification, heat treatment is performed, first solution treatment and then artificial aging. The solution treatment temperature is 535 ° C for 3 h and the artificial aging temperature is 185 ° C for 9 h to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy; The preparation method of the reinforcement phase comprises the following steps: S11. Silicon carbide nanowires, silicon carbide nanoparticles, high entropy alloy Al 20 Cu 20 Fe 20 Mn 20 Ni 20 Powder dispersed in anhydrous ethanol, silicon carbide nanowires, silicon carbide nanoparticles, high entropy alloy Al 20 Cu 20 Fe 20 Mn 20 Ni 20 The mass volume ratio of powder and anhydrous ethanol is 4.5g:4.5g:3.5g:100mL. After ultrasonic dispersion, a silicon carbide dispersion is obtained; S12. PVP was added to ethanol to form an 11 wt% PVP solution; S13 PS microspheres were added to the PVP solution, the particle size of the PS microspheres was 1.5 mm, the mass ratio of PS microspheres to PVP solution was 2:10, and the mixture was stirred to obtain a PS-containing PVP solution; S14. The silicon carbide dispersion and the PS-containing PVP solution were mixed in equal volumes and dried. The mixture was sintered in air at 270°C for 2.2 hours. The mixture was then sintered at a constant temperature of 980°C for 4 hours under nitrogen to obtain a reinforcement phase. Each embodiment and comparative example was prepared into a standard specimen (50 mm * 70 mm * 120 mm), and a tensile test was performed using a universal testing machine. The tensile test method was carried out in accordance with the GB / T 228.1-2021 standard. The results are shown in Table 2. Table 2 shows the mechanical properties of the samples in the examples and comparative examples. Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A high entropy alloy composite ceramic reinforced recycled aluminum alloy, characterized by: The recycled aluminum alloy consists of a matrix material and a reinforcement phase, the matrix material is recycled aluminum, the reinforcement phase consists of a high entropy alloy and a three-dimensional porous ceramic material, and the high entropy alloy is uniformly distributed on the three-dimensional porous ceramic material.

2. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 1, characterized in that: The high entropy alloy in the reinforcement phase is Al 20 Cu 20 Fe 20 Mn 20 Ni 20 , the three-dimensional porous ceramics in the reinforcement phase are SiC porous ceramics.

3. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 1, characterized in that: The preparation method of the reinforcing phase comprises the following steps: S11. The silicon carbide nanowires and silicon carbide nanoparticles are dispersed in anhydrous ethanol and uniformly dispersed by ultrasonication to obtain a silicon carbide dispersion; S12. PVP is added to ethanol to form a PVP solution; S13. PS microspheres were added to the PVP solution and stirred to mix thoroughly. Then, equimolar amounts of citric acid, Al(NO3)3·9H2O, Cu(NO3)2, FeCl3·6H2O, Mn(CH3COO)2·4H2O, and Ni(CH3COO)2·4H2O were added to the PVP solution and stirred to mix thoroughly to obtain a PVP solution containing metal salts. S14. The silicon carbide dispersion and the PVP solution containing the metal salt are mixed in equal volumes and dried, sintered under air conditions, and then sintered at a constant temperature under nitrogen conditions to obtain a reinforcement phase.

4. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 2, characterized in that: In the step S11, the mass volume ratio of the silicon carbide nanowires, silicon carbide nanoparticles and anhydrous ethanol is 3-6 g:3-6 g:100 mL.

5. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 2, characterized in that: The concentration of the PVP solution in step S12 is 8-12 wt %.

6. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 2, characterized in that: In step S13, the particle size of the PS microspheres is 1.5 mm, the mass ratio of the PS microspheres to the PVP solution is 1-2:10, and the concentration of citric acid in the PVP solution is 1-2 mol / L.

7. The high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 2, characterized in that: In the step S14, the sintering temperature under air conditions is 250-300° C., and the time is 1.5-3 hours; the constant temperature sintering temperature under nitrogen conditions is 900-1020° C., and the time is 3-5 hours.

8. The method for preparing a high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 1, characterized in that: The following steps are involved: S1. Mixing recycled aluminum scrap and pure aluminum, the types and mass percentages of each element satisfying the following: Si: 1 to 2.1%; Fe: 0.35-0.9%; Mg: 0.17~0.3%; Zn: 0.05-0.1%; Mn: 0.1-0.5%; the balance is Al, and the remaining elements are considered impurities and have a content of less than 0.1%. The mixed metal raw materials are heated until melted to obtain aluminum alloy liquid; S2. Add the reinforcing phase to the extrusion device, heat the extrusion device, pour the aluminum alloy liquid into the extrusion device, pressurize the extrusion device, maintain the pressure until the aluminum alloy liquid solidifies, and perform heat treatment after solidification to obtain a high-entropy alloy composite ceramic reinforced recycled aluminum alloy.

9. The method for preparing a high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 8, characterized in that: The pressurized pressure is 45-75 MPa.

10. The method for preparing a high entropy alloy composite ceramic reinforced recycled aluminum alloy according to claim 8, characterized in that: The heat treatment is first solution treatment and then artificial aging, the solution treatment temperature is 530-535° C., the time is 3-3.5 hours, and the artificial aging temperature is 180-190° C., the time is 8-10 hours.

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