High-performance nickel-based alloy strip and preparation method thereof

Abstract

The invention provides a high-performance nickel-based alloy strip and a preparation method thereof, and relates to the field of nickel-based alloy strip machining, the strip is of a four-layer composite structure composed of a nickel-based alloy surface layer, a nanometer composite function middle layer, an anti-oxidation transition layer and a nickel-based alloy bottom layer, and the high-performance nickel-based alloy strip is prepared through the following steps that matrix raw materials are prepared according to the mass percent, 40%-55% of Ni, 25%-35% of Al, 5%-10% of Li, 3%-8% of Sn, 2%-5% of Bi and 1%-3% of Nb are selected and evenly mixed and then subjected to mechanical alloying treatment, the ball-to-material ratio is 20: 1-30: 1, the ball-milling rotating speed is 300-450 r / min, and the ball-milling time is 8-12 h. Through the synergistic process of nickel-based alloy layer plasma activation, antioxidant transition layer intermediary and vacuum hot-pressing pre-compounding and asynchronous composite rolling, the content of active groups on the surface of the nickel-based alloy layer is larger than or equal to 85%, stable metallurgical bonding is formed between the nickel-based alloy layer and the transition layer, interlayer atom diffusion is promoted through shear stress generated by asynchronous rolling, and the nickel-based alloy layer is formed. And the stress is released through online heat preservation between passes, so that the problem of interlayer separation of an existing composite strip under the high-temperature working condition is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of nickel-based alloy strip processing, and more particularly to high-performance nickel-based alloy strips and their preparation methods. Background Technology

[0002] Nickel-based alloy composite strips, with their excellent high-temperature mechanical properties, corrosion resistance, and functional integration potential, have become core materials in high-end fields such as key components of aerospace engines, advanced energy storage devices, and precision components in high-temperature corrosive environments. As equipment develops towards ultra-high temperature, long lifespan, and high reliability, more stringent requirements are being placed on the interlayer bonding stability and high-temperature service durability of nickel-based alloy composite strips. Currently, the mainstream composite strip preparation methods in the industry mainly include vacuum melting-rolling composite, explosive composite, brazing composite, and conventional vacuum hot pressing composite. Among these, the process combining vacuum hot pressing and rolling is widely used due to its strong operational controllability and suitability for mass production.

[0003] In the surface treatment stage, existing technologies mostly employ mechanical grinding, simple oxidation, or conventional pickling to treat the surface of nickel-based alloy layers. This only achieves preliminary adjustment of surface roughness and is insufficient to effectively increase the content of surface active groups. Consequently, the bonding at the interlayer interface is mainly based on physical adsorption, lacking a solid metallurgical bonding foundation. Regarding the design of the transition layer, traditional composite strips often use a single metal or oxide coating as the transition medium. This results in problems such as high porosity and poor compatibility with the substrate. It fails to effectively alleviate the differences in thermal expansion coefficients and element diffusion barriers between the nickel-based alloy layer and the functional intermediate layer, and instead easily becomes a weak point for interlayer stress concentration. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-performance nickel-based alloy strip and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing high-performance nickel-based alloy strip, aiming to solve the technical problems of interlayer delamination, rapid oxidation rate, and poor synergy between mechanical properties and energy storage performance of existing nickel-based alloy strips under ultra-high temperature (≥800℃) and strong corrosion conditions. The strip adopts a four-layer composite structure of "nickel-based alloy surface layer, nanocomposite functional intermediate layer, anti-oxidation transition layer, and nickel-based alloy bottom layer". The preparation method includes the following steps: S1. Select Ni 42-53%, Al 28-32%, Li 6-9%, Sn 4-7%, Bi 3-4%, and Nb 1.5-2.5% by mass percentage, mix them evenly, and then perform mechanical alloying treatment. The mechanical alloying uses stainless steel balls as the grinding media, with a ball-to-material ratio of 22:1-28:1, a ball milling speed of 350-420 r / min, and a ball milling time of 9-11 h to obtain ultrafine powder with a particle size ≤5μm. S2. Add 1.5-2.5% by mass of TiC nanoparticles (particle size 60-90nm) to the ultrafine powder, and perform ultrasonic dispersion under argon gas with a purity ≥99.99% at an ultrasonic power of 350-450W for a dispersion time of 40-50min. Then, use cold isostatic pressing to form a preform with a molding pressure of 220-280MPa and a holding time of 6-9min to obtain an intermediate layer preform with a density ≥92%. S3. Place the intermediate layer blank in a vacuum sintering furnace and heat it to 1180-1220℃ at a heating rate of 6-7℃ / min. Hold it at that temperature for 2.5-3.5h and then cool it to room temperature with the furnace (cooling rate ≤15℃ / h) to obtain a nanocomposite functional intermediate layer with a grain size of 1-3μm. S4. Atmospheric plasma spraying technology is used, with Al2O3-TiO2 composite powder (mass ratio 7:3, particle size 20-50μm) as the spraying material, spraying power 38-42kW, spraying distance 85-95mm, powder feeding rate 22-28g / min, spraying angle 90°, and an antioxidant transition layer of 12-18μm is prepared on the upper and lower surfaces of the nanocomposite intermediate layer, with the porosity of the transition layer ≤3%; S5. Place the nickel-based alloy billet in a plasma surface treatment device and perform surface activation treatment in an argon and oxygen mixed atmosphere (volume ratio 8:2, total gas flow rate 15-25L / min). The treatment power is 22-28kW, the treatment time is 6-9min, and the surface roughness of the billet after activation is Ra=1.0-1.3μm, and the content of surface active groups is ≥85%. S6. Stack the modified nickel-based alloy surface layer, anti-oxidation transition layer, nanocomposite functional intermediate layer, anti-oxidation transition layer, and nickel-based alloy bottom layer in sequence, and place them in a vacuum hot press furnace, controlling the vacuum degree to 6×10⁻. 4 -9×10⁻ 4 Pa, heating to 1020-1080℃ at 3.5-4.5℃ / min, applying pressure of 55-75MPa, and holding for 3.5-4.5h to achieve preliminary metallurgical bonding between layers; S7. Multi-pass rolling is carried out using a twin-roll asynchronous cold rolling mill. The upper roll speed is 1.4-1.6 m / s, the lower roll speed is 0.9-1.1 m / s, the rolling temperature is 980-1030℃, the total reduction rate is 65-72%, and it is completed in 4 passes with reduction rates of 25%, 20%, 15%, and 12% respectively. Online heat preservation is carried out between adjacent passes at a temperature of 920-940℃ for 16-18 min. S8. Under a DC magnetic field of 0.35-0.45T (the direction of the magnetic field is consistent with the rolling direction of the strip), the temperature is raised to 1100-1160℃ and held for 1.8-2.2h. Then, water quenching is used for cooling at a rate of ≥90℃ / s to homogenize the alloy structure. S9. Under an ultrasonic field with a power of 220-280W and a frequency of 25-35kHz, heat to 730-770℃, hold for 7-9 hours, and then cool to room temperature with the furnace to promote the dispersion and precipitation of the reinforcing phase. S10. Use a fiber laser for surface cleaning. The laser power is 60-90W, the scanning speed is 6-9mm / s, and the number of scans is 2 to remove surface oxide scale and impurities. S11. Use a polishing slurry based on phosphoric acid, sulfuric acid, and chromic anhydride. The polishing slurry contains 62-68% phosphoric acid, 12-14% sulfuric acid, and 6-9% chromic anhydride (by mass). The polishing temperature is 45-55℃, the current density is 12-18A / dm², and the polishing time is 3.5-4.5min, so that the surface roughness Ra of the strip is ≤0.2μm. S12. A 29-31 roll straightener is used, with a straightening speed of 0.6-0.9 m / s. The flatness of the strip after straightening is ≤0.02 mm / m, ultimately obtaining a high-performance nickel-based alloy strip with a thickness of 0.2-0.9 mm and a width of 250-650 mm. Preferably, the TiC nanoparticles in S1 are surface modified with silane coupling agent KH550. The modification process is as follows: TiC nanoparticles are dispersed in an ethanol aqueous solution, and KH550 with a mass fraction of 0.8-1.2% of TiC particles is added. The mixture is stirred and modified at 85-95℃ for 2.2-2.8 h, filtered, and then dried at 120℃ for 3 h. Preferably, the raw material mass percentage of the nickel-based alloy billet in S3 is: Ni 72-78%, Cr 14-16%, Mo 5-7%, Ta 3-4%, Ti 0.7-1.0%, Al 0.4-0.7%, C≤0.012%, P≤0.006%, S≤0.006%, with the remainder being unavoidable impurities. Preferably, during the mechanical alloying process in S1, 0.6-0.9% by mass of stearic acid is added as a process control agent to prevent powder agglomeration. Preferably, the arc voltage of plasma spraying in S2 is 32-36V, the arc current is 800-900A, and the bonding strength between the anti-oxidation transition layer and the nanocomposite functional intermediate layer after spraying is ≥45MPa.

[0006] Preferably, the heating process of vacuum hot pressing pre-composite in S4 is divided into two stages: the first stage is from room temperature to 800℃, with a heating rate of 2.5-3.0℃ / min; the second stage is from 800℃ to the target temperature, with a heating rate of 4.0-4.5℃ / min. Preferably, the magnetic field strength error of the magnetic field-assisted solid solution treatment in S5 is ≤ ±0.02T, and the uniformity of the ultrasonic field in the ultrasonic-assisted aging treatment is ≥90%. Preferably, the laser cleaning spot size in S6 is 0.8-1.2 mm, and the scanning interval is 0.5-0.7 mm. Preferably, in the four-layer composite structure, the nickel-based alloy surface layer has a thickness of 0.1-0.3 mm, the nanocomposite functional intermediate layer has a thickness of 0.3-0.8 mm, the anti-oxidation transition layer has a thickness of 12-18 μm, and the nickel-based alloy bottom layer has a thickness of 0.1-0.3 mm, with a thickness tolerance of ≤±5% for each layer. Preferably, the high-performance nickel-based alloy strip is prepared using any one of the high-performance nickel-based alloy strip preparation methods, and is composed of the following materials: Ni 40-55%, Al 25-35%, Li 5-10%, Sn 3-8%, Bi 2-5%, Nb 1-3%. The performance indicators of the nickel-based alloy strip are: tensile strength ≥1100MPa, yield strength ≥750MPa, elongation ≥25%, high-temperature creep strength at 800℃ ≥450MPa / 100h, oxidation rate at 700℃ ≤0.005mm / a, interlaminar shear strength ≥200MPa, and energy storage density of the nanocomposite intermediate layer ≥320J / g.

[0007] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, through the synergistic process of plasma activation of nickel-based alloy layer, intermediate anti-oxidation transition layer, vacuum hot pressing pre-composite and asynchronous composite rolling, the content of active groups on the surface of nickel-based alloy layer is ≥85%, forming a stable metallurgical bond with the transition layer. The shear stress generated by asynchronous rolling promotes interlayer atomic diffusion. Then, the stress is released by online heat preservation between passes, so that the interlayer shear strength is ≥220MPa. After 1000 thermal cycles at 25℃-800℃, there is no interlayer delamination, effectively solving the problem of interlayer separation of existing composite strips under high temperature conditions.

[0008] 2. In this invention, the porosity of the Al2O3-TiO2 anti-oxidation transition layer on the upper and lower surfaces of the nanocomposite intermediate layer is ≤3%, forming a dense protective barrier that can prevent oxygen from diffusing into the interior at ultra-high temperature of 800℃, and make the static oxidation rate at 700℃ ≤0.003mm / a; the precise ratio of Cr and Mo elements and the addition of Ta element in the nickel-based alloy layer further enhance corrosion resistance and ensure that the strip can be used stably for a long time under strong corrosion conditions.

[0009] 3. In this invention, the nanocomposite functional intermediate layer is mechanically alloyed to form 1-3μm ultrafine grains, which, combined with the dispersion strengthening effect of TiC nanoparticles, and multi-field coupled heat treatment that accelerates element diffusion with magnetic field-assisted solid solution and promotes dispersion precipitation of strengthening phase with ultrasonic assisted aging, achieves synergistic optimization of mechanical properties and energy storage performance. Detailed Implementation

[0010] This invention provides a high-performance nickel-based alloy strip and its preparation method. Ni is selected as the matrix element for the nanocomposite functional intermediate layer to ensure basic toughness; Al is the main alloying element to improve oxidation resistance; Li, Sn, and Bi synergistically optimize energy storage performance; and Nb is used as a reinforcing element to refine grains. These raw materials are mixed evenly in a specific ratio and placed in a ball mill jar. Stainless steel balls are added as the grinding medium. After sealing the ball mill jar, a vacuum is drawn and argon gas is introduced for protection. The ball mill is started and mechanical alloying is performed according to the set ball-to-material ratio, rotation speed, and time. During the process, the temperature inside the ball mill jar is monitored in real time by the equipment control system to avoid excessive temperature affecting powder properties. After obtaining ultrafine powder, TiC nanoparticles are first dispersed in an ethanol-water solution, and a specified amount of silane is added. The surface modification was carried out using KH550 additive under continuous stirring at a set temperature. After filtration and drying to remove moisture, the modified TiC nanoparticles were then added to the ultrafine powder in a specific ratio and placed together in an ultrasonic bath. Argon gas of the required purity was introduced to purge the air from the bath, and the ultrasonic equipment was started to disperse the TiC nanoparticles at the set power and time to ensure uniform distribution of the TiC nanoparticles in the powder. After dispersion, the mixed powder was loaded into a mold and placed in a cold isostatic press. A set pressure was applied and held for a certain time to obtain an intermediate layer green body with the required density. The intermediate layer green body was then placed in a vacuum sintering furnace. After closing the furnace door, a vacuum was evacuated to the set vacuum level, and the furnace was heated at a set rate using the furnace heating system. After reaching the target temperature, the temperature was held, and the vacuum level and temperature inside the furnace were continuously monitored during the holding period. To ensure parameter stability, after the heat preservation period, the furnace body is cooled to room temperature at a specified rate to obtain a nanocomposite functional intermediate layer. Al2O3-TiO2 composite powder is used as the raw material for the antioxidant transition layer. The powder is first dried to remove moisture, then loaded into the powder feeder of the plasma spraying equipment. The spraying power, distance, powder feeding rate, and spraying angle are adjusted. The equipment is then started to spray the upper and lower surfaces of the nanocomposite intermediate layer. During spraying, the intermediate layer or spray gun is moved to ensure uniform surface coverage of the transition layer, forming an antioxidant transition layer with the required porosity. Ni is selected as the matrix of the nickel-based alloy layer, combined with Cr to improve corrosion resistance, Mo and Ta to enhance high-temperature strength, and Ti and Al to promote the precipitation of strengthening phases. C is strictly controlled. The content of impurity elements such as P and S was adjusted to prepare nickel-based alloy billets according to the specified proportions. The billets were fixed on the sample stage of the plasma surface treatment equipment, and a mixture of argon and oxygen was introduced. The gas flow rate and ratio were adjusted, and the equipment was started to perform surface activation treatment according to the set power and time. During the treatment, the surface roughness of the billet was monitored in real time using a roughness meter to ensure that the set requirements were met. Subsequently, the modified nickel-based alloy surface layer, anti-oxidation transition layer, nanocomposite functional intermediate layer, anti-oxidation transition layer, and nickel-based alloy bottom layer were neatly stacked in sequence and placed in a vacuum hot press furnace. After sealing the furnace body, a vacuum was evacuated to the set vacuum level, and the temperature was increased according to a two-stage heating program. The first stage increased the temperature from room temperature to the set temperature, and the second stage continued to increase the temperature to the target temperature. The heating rate was controlled during the heating process.After reaching the target temperature, a set pressure is applied and the material is held at that temperature to achieve preliminary metallurgical bonding between the layers. After holding, the material is allowed to cool naturally. Then, the composite billet is fed into a twin-roll asynchronous cold rolling mill. The speeds of the upper and lower rolls are adjusted, and the rolling temperature and total reduction rate are set. Rolling is performed in four passes. After each pass, the strip is fed into an online holding device to maintain the set temperature and holding time, ensuring stress release between layers. During the rolling process, the strip thickness and surface quality are monitored in real time. After rolling, the strip is placed in a magnetic field-assisted heat treatment device. A protective gas is introduced, and a DC magnetic field consistent with the rolling direction of the strip is applied. The magnetic field strength error is controlled within the allowable range. Simultaneously, the temperature is increased to the solution temperature at a set rate. After holding for a certain time, the strip is quickly immersed in water for water quenching to ensure that the cooling rate meets the requirements and to homogenize the alloy structure. The strip was then placed in an ultrasonic-assisted aging furnace, a protective gas was introduced, the ultrasonic equipment was started, and the ultrasonic power and frequency were adjusted to ensure the uniformity of the ultrasonic field. The temperature was increased to the aging temperature at a set rate, held for a certain time, and then cooled to room temperature with the furnace to promote the dispersion and precipitation of the strengthening phase. Finally, the strip underwent precision post-processing. First, a fiber laser was used to clean the surface of the strip. The laser power, scanning speed, spot size, and scanning spacing were adjusted, and two scans were performed to remove surface oxide scale and impurities. Then, the strip was placed as the anode in a phosphoric acid-sulfuric acid-chromic anhydride polishing solution. The power supply was connected, and the polishing temperature, current density, and polishing time were controlled. After polishing, the strip was removed and rinsed thoroughly with deionized water. Finally, the strip was fed into a multi-roll straightener. The pressure of the straightening rollers and the straightening speed were adjusted to ensure that the flatness of the straightened strip met the requirements, resulting in a high-performance nickel-based alloy strip.

[0011] Working principle: This preparation method achieves comprehensive performance enhancement of high-performance nickel-based alloy strips through the synergistic effect of various process steps. In the preparation of the nanocomposite functional interlayer, mechanical alloying treatment forms ultrafine powder from the raw materials, which, combined with the dispersion strengthening effect of TiC nanoparticles, and the improved compatibility of TiC with the matrix after modification by silane coupling agents, effectively avoids agglomeration. The vacuum sintering process further refines the grains, endowing the interlayer with excellent energy storage performance and mechanical strength. The anti-oxidation transition layer is prepared by plasma spraying of Al2O3-TiO2 composite powder, forming a dense protective layer that can prevent oxygen diffusion to the interlayer and nickel-based alloy layer under ultra-high temperature conditions, significantly reducing the oxidation rate. After plasma surface activation treatment, the nickel-based alloy layer forms a high content of active groups on the surface, and the roughness reaches the appropriate range, greatly improving the metallurgical bonding force with the anti-oxidation transition layer and reducing the risk of interlayer delamination. Vacuum hot pressing pre-composite eliminates interlayer porosity and gaps through a high-temperature and high-pressure environment, laying a good foundation for subsequent asynchronous composite rolling. Asynchronous composite rolling utilizes the shear stress generated by the speed difference between the upper and lower rolls to further promote interlayer atomic diffusion and improve interlayer bonding strength. In multi-field coupled heat treatment, magnetic field-assisted solid solution can accelerate the diffusion of alloying elements, making the microstructure more uniform. Water quenching inhibits the precipitation of harmful phases, while ultrasonic-assisted aging promotes the dispersion precipitation of strengthening phases through ultrasonic vibration, optimizing the microstructure and improving the mechanical properties and high-temperature creep strength of the strip. In precision post-processing, laser cleaning removes surface impurities and oxide scale, electrolytic polishing reduces surface roughness, and multi-roll straightening ensures the dimensional accuracy and flatness of the strip. All these steps work together to achieve synergistic optimization of the prepared nickel-based alloy strip in terms of room temperature mechanical properties, high-temperature properties, interlayer bonding properties, and energy storage properties, meeting the requirements of ultra-high temperature and strong corrosion conditions.

[0012] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments applicable to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, still fall within the protection scope of the present invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

Claims

1. A method for preparing high-performance nickel-based alloy strip, characterized in that, The strip is a four-layer composite structure consisting of a nickel-based alloy surface layer, a nanocomposite functional intermediate layer, an anti-oxidation transition layer, and a nickel-based alloy bottom layer, and is manufactured by the following steps: S1. The matrix raw materials are selected by mass percentage as Ni 40-55%, Al 25-35%, Li 5-10%, Sn 3-8%, Bi 2-5%, and Nb 1-3%. After being mixed evenly, they are mechanically alloyed with a ball-to-material ratio of 20:1-30:1, a ball milling speed of 300-450 r / min, and a ball milling time of 8-12 h. S2. Nano-reinforced phase dispersion: 1-3% by mass of TiC nanoparticles with a particle size of 50-100nm are added to the ultrafine powder. The mixture is ultrasonically dispersed for 30-60 minutes under argon protection. Then, it is cold isostatically pressed at a pressure of 200-300MPa and held for 5-10 minutes to obtain the intermediate layer blank. S3, Intermediate Layer Sintering: The green body is placed in a vacuum sintering furnace, 1×10 -4 -5×10 -4 Under a vacuum of Pa, the temperature is increased to 1150-1250℃ at 5-8℃ / min and held for 2-4 hours, and then cooled to room temperature in the furnace to obtain a nanocomposite functional intermediate layer. S4. Using plasma spraying technology, with Al2O3-TiO2 composite powder in a mass ratio of 7:3 as raw material, spraying power of 35-45kW and spraying distance of 80-100mm, an antioxidant transition layer of 10-20μm is prepared on the upper and lower surfaces of the nanocomposite intermediate layer. S5. The nickel-based alloy billet is subjected to plasma surface activation treatment in an atmosphere of argon and oxygen mixed at a volume ratio of 8:2 for 5-10 minutes. After activation, the surface roughness Ra = 0.8-1.5 μm. S6, four-layer composite rolling, the modified nickel-based alloy surface layer, anti-oxidation transition layer, nano-composite intermediate layer, anti-oxidation transition layer and nickel-based alloy bottom layer are stacked in sequence, and vacuum hot pressing is performed under a pressure of 50-80MPa, and the temperature is maintained at 1000-1100℃ for 3-5h. S7. A twin-roll asynchronous cold rolling mill is used, with the upper roll speed at 1.2-1.8 m / s and the lower roll speed at 0.8-1.2 m / s. The rolling temperature is 950-1050℃, and the total reduction rate is 60-75%, which is completed in 3-5 passes. The adjacent passes are held at 900-950℃ for 15-20 minutes. S8. Under a DC magnetic field of 0.3-0.5T, heat to 1080-1180℃, hold for 1.5-2.5h, and then cool by water quenching. S9. Under an ultrasonic field with a power of 200-300W, heat to 720-780℃, hold for 6-10 hours, and then cool to room temperature with the furnace. S10. Laser cleaning of the strip, current density 10-20A / dm², time 3-5min, electrolytic polishing, and roller straightening to obtain high-performance nickel-based alloy strip with a thickness of 0.15-1.0mm and a width of 200-700mm.

2. The method for preparing high-performance nickel-based alloy strip according to claim 1, characterized in that, The TiC nanoparticles in S1 were surface modified with a silane coupling agent at a temperature of 80-100℃ for 2-3 hours.

3. The method for preparing high-performance nickel-based alloy strip according to claim 2, characterized in that, The raw material mass percentage of the nickel-based alloy billet in S3 is: Ni 70-80%, Cr 12-18%, Mo 4-8%, Ta 2-5%, Ti 0.5-1.2%, Al 0.3-0.8%, C≤0.015%, P≤0.008%, S≤0.008%.

4. The method for preparing high-performance nickel-based alloy strip according to claim 3, characterized in that, The heating rate in S4 is 3-5℃ / min.

5. The method for preparing high-performance nickel-based alloy strip according to claim 4, characterized in that, In S5, the direction of the magnetic field for magnetic field-assisted solid solution is consistent with the rolling direction of the strip, and the ultrasonic frequency for ultrasonic-assisted aging is 20-40kHz.

6. The method for preparing high-performance nickel-based alloy strip according to claim 5, characterized in that, The S6 electrolytic polishing solution consists of 60-70% phosphoric acid, 10-15% sulfuric acid, and 5-10% chromic anhydride.

7. The method for preparing high-performance nickel-based alloy strip according to claim 6, characterized in that, The polishing temperature in S6 is 40-60℃.

8. The method for preparing high-performance nickel-based alloy strip according to claim 7, characterized in that, In S1, stainless steel balls are used for mechanical alloying, and 0.5-1% stearic acid is added as a process control agent during the ball milling process.

9. The method for preparing high-performance nickel-based alloy strip according to claim 8, characterized in that, In S2, the powder feeding rate of plasma spraying is 20-30 g / min, and the spraying angle is 90°. In S4, the pass reduction rates of asynchronous composite rolling are 25%, 20%, 15%, and 10%, respectively.

10. A high-performance nickel-based alloy strip, characterized in that, The high-performance nickel-based alloy strip is prepared using any one of claims 1-9, comprising the following materials: Ni 40-55%, Al 25-35%, Li 5-10%, Sn 3-8%, Bi 2-5%, and Nb 1-3%. The performance indicators of the nickel-based alloy strip are: tensile strength ≥1100MPa, yield strength ≥750MPa, elongation ≥25%, high-temperature creep strength at 800℃ ≥450MPa / 100h, oxidation rate at 700℃ ≤0.005mm / a, interlaminar shear strength ≥200MPa, and energy storage density of the nanocomposite intermediate layer ≥320J / g.