Preparation method of beryllium-copper-based high-entropy alloy strip prepared by adopting vacuum magnetic suspension

Abstract

The invention discloses a method for preparing a beryllium-copper-based high-entropy alloy strip by adopting vacuum magnetic suspension, and relates to a method for preparing a beryllium-copper-based alloy strip for a photomultiplier. The invention aims to solve the problems that the traditional Cu-Be alloy strip can only form a BeO single film, the secondary electronic performance is insufficient, and multiple performances are difficult to meet; the traditional smelted high-entropy alloy is easy to generate segregation; the problems of blindness, easy damage to a matrix, many chemical residues and the like of a traditional brushing process are solved. The method comprises the following steps: 1, vacuum magnetic suspension casting; 2, throwing the blank; 3, quenching; 4, mechanical brushing; (5) rolling; 6, rolling by a four-roller mill; 7, rolling by using a six-roller mill; 8, performing online annealing; 9, rolling by a 20-roller rolling mill; tenthly, online annealing is conducted; 11, trimming; 12, stretch bending and straightening; 13, alternating current cleaning and brushing; and 14, rolling. The method is different from a traditional strip preparation process combining smelting and mechanical brushing, blank manufacturing is conducted in a small vacuum magnetic suspension smelting and continuous blank drawing mode, surface treatment is conducted on the rolled plate through the composite surface treatment technology combining the electric field effect and mechanical brushing, and controllable coil weight preparation and targeted surface cleaning are achieved. According to the preparation method, the Cu-Be-Al-Mg-Y-Ce alloy composite strip for the photomultiplier can be obtained.

Description

Technical Field

[0001] This invention relates to a method for preparing Cu-Be-Al-Mg-Y-Ce composite tape for photomultiplier electrodes. Background Technology

[0002] Due to its excellent secondary electron emission performance, Cu-Be alloy is widely used as a photomultiplier in aerospace, medical electronic equipment, and other fields. However, after sensitization, Cu-Be alloy can only form a single BeO thin film, resulting in relatively low secondary electron emission performance, which cannot meet the application requirements of photomultiplier tubes. Currently, most materials with high secondary electron emission performance are provided by MgO thin films, which, while meeting the secondary electron emission performance requirements, are not suitable for direct exposure to the atmosphere. With the development of electronic components, higher demands are being placed on the performance of photomultiplier tubes, necessitating the exploration of a secondary electron emission material that combines high secondary electron performance, high stability, uniform surface electron emission, and long lifetime. This patent, based on Cu-Be alloy, introduces trace elements such as Mg, Al, Y, and Ce to obtain a MgO / BeO / Y2O3 / Al2O3 / CeO2 composite multi-element oxide layer, thus preparing a secondary electron emission material with high secondary electron performance, high stability, uniform surface electron emission, and long lifetime. This invention proposes a small-scale vacuum magnetic levitation melting and continuous drawing method for Cu-Be-Al-Mg-Y-Ce alloys. It also utilizes a composite surface treatment technology combining electric field action and mechanical cleaning for the surface treatment of rolled plates. This achieves controllable coil weight preparation and targeted surface cleaning, resulting in a Cu-Be-Al-Mg-Y-Ce alloy with excellent secondary electronic properties. The main advantages of this invention are:

[0003] I. Achieving a Breakthrough in Secondary Electron Emission Performance through Multi-Component Alloy Hybridization: Patent CN119589302A developed a novel composite metallic multiplier material that combines the advantages of BeO and MgO. However, its ability to improve secondary electron emission performance is limited. This patent introduces Mg to enhance secondary electron performance, Al to improve chemical stability, Y to enhance thermal stability, and Ce to improve surface electron emission uniformity based on the Cu-Be alloy system. A multi-component composite system is constructed, and a beryllium copper-based high-entropy alloy is designed. The alloy microstructure is optimized to obtain multiple defects and improve the uniformity of defect distribution, promoting multiple scattering and escape of secondary electrons. After sensitization treatment, a MgO / BeO / Y2O3 / Al2O3 / CeO2 composite film is obtained. A breakthrough in secondary electron emission performance is achieved through the synergistic effect of multiple components.

[0004] II. Direct billet pulling after vacuum magnetic levitation melting ensures uniform alloy performance through a short process. Cu-Be-Al-Mg-Y-Ce alloys have many elemental components and high entropy values, making them prone to segregation and difficult to prepare using traditional Cu-Be alloy melting methods. This invention employs magnetic levitation melting, effectively avoiding contact contamination between the alloy melt and crucible material, significantly improving alloy purity. Simultaneously, thorough mixing of the molten metal promotes compositional homogenization, preventing segregation in medium-to-high entropy alloys due to their complex composition, thus ensuring uniform alloy performance. Furthermore, magnetic levitation melting ensures that oxide inclusions and external contaminants remain only on the surface of the alloy melt, requiring only surface treatment to obtain high-purity alloy billets. Additionally, small-scale vacuum magnetic levitation melting provides a continuous supply of melt, which, combined with subsequent direct billet pulling, enables low-cost, weight-controllable continuous preparation of Cu-Be-Al-Mg-Y-Ce alloys.

[0005] Third, the invention introduces a multi-stage mechanical brushing surface treatment method with an electric field to improve cleaning targeting. This invention uses a composite surface treatment technology combining electric field action and mechanical brushing. The electric field generates electrostatic attraction or repulsion on surface contaminants, making them easier to detach from the material surface. Combined with the physical peeling effect of mechanical brushing, this significantly improves cleaning efficiency. On one hand, the use of brush heads with different hardnesses and the directional effect of the electric field enhances the targeting of contaminants, reducing blind brushing and preventing surface contaminants from embedding into the alloy substrate while achieving efficient cleaning. This reduces the risk of scratches or damage to the surface, ensuring surface smoothness and integrity. On the other hand, this method does not rely on acid or alkali reagents, reducing chemical residues and wastewater discharge from the source, aligning with green manufacturing principles. It also avoids the corrosion or performance damage to the substrate technology caused by chemical reagents. Summary of the Invention

[0006] The purpose of this invention is to address the problems of traditional Cu-Be alloy strips, which can only form a single BeO film, resulting in insufficient secondary electronic properties and difficulty in meeting multiple performance requirements; the tendency of traditional smelting of high-entropy alloys to produce segregation; and the blindness, easy damage to the matrix, and large amounts of chemical residues in traditional cleaning processes. Therefore, this invention provides a method for preparing beryllium copper-based high-entropy alloy strips using vacuum magnetic levitation.

[0007] A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation is completed according to the following steps:

[0008] I. Vacuum Magnetic Levitation Casting

[0009] Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixture is placed inside the induction coil of a vacuum magnetic levitation melting equipment. The vacuum chamber is then closed and evacuated to 10⁻³~10⁻ 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1200~1350℃, holds it at that temperature for 15~20min, and obtains a uniform alloy molten pool.

[0010] II. Throwing

[0011] The molten alloy is drawn into the lower molten pool and the die opening by gravity. The cooling rate of the die opening is controlled at 50~100℃ / s, resulting in a Cu-Be-Al-Mg-Y-Ce alloy slab with a thickness of 1mm and a coil weight of 100kg~400kg. The Be, Mg, Al, Y, and Ce element contents are 1.8~2.3wt.%, 0.05~0.6wt.%, 0.05~0.6wt.%, 0.05~0.6wt.%, and 0.05~0.6wt.%, respectively.

[0012] III. Quenching, mechanical cleaning, and winding

[0013] After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6 μm. The slab is then wound on a winding machine at a winding tension of 5~8 kN and a winding speed of 10~15 m / min to obtain coils with a diameter of 300~400 mm for later use.

[0014] IV. Rolling

[0015] The billet is heated to 750℃~800℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopts reciprocating rolling, with a reduction of 10%-15% per pass and a total reduction of 30%-40%. The rolling speed is 5m / min, resulting in Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.24mm~0.28mm and a width of 80mm. It is then annealed online in H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm.

[0016] V. Edge trimming, bending and straightening

[0017] After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in an H2 atmosphere, the edges are trimmed, and then it is straightened by tension bending on a straightening machine.

[0018] VI. AC cleaning and winding

[0019] The Cu-Be-Al-Mg-Y-Ce alloy slab is placed on the worktable of an electromechanical cleaning device. The power supply is turned on and the voltage is adjusted to 8~12V. Simultaneously, the bronze wire mechanical cleaning device is started, with the rotation speed controlled at 250~300 r / min, the cleaning pressure at 0.15~0.2 MPa, and the processing time at 4~6 min, to remove stubborn oxide scale and rust from the surface. Then, the power supply voltage is adjusted to 5~8V, the bronze wire mechanical cleaning wheel is turned off, and the stainless steel wire cleaning wheel is turned on. The rotation speed is reduced to 180~220 r / min, the cleaning pressure is adjusted to 0.1~0.15 MPa, and the processing time at 3~5 min. After the two cleaning processes are completed, the Cu-Be-Al-Mg-Y-Ce alloy is fed forward. The two cleaning processes are repeated for the parts that have not undergone the cleaning process. The slab is then wound up to obtain a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the preparation process of the beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation, as described in this invention.

[0021] Figure 2 This is a schematic diagram of the vacuum magnetic levitation melting process used in the preparation of beryllium copper-based high-entropy alloy strips according to the present invention.

[0022] Figure 3 This is a schematic diagram of the AC cleaning brush used in the preparation of beryllium copper-based high-entropy alloy strip prepared by vacuum magnetic levitation according to the present invention. Detailed Implementation

[0023] The following embodiments further illustrate the content of the present invention, but should not be construed as limiting the present invention. Any modifications and substitutions made to the methods, steps, or conditions of the present invention without departing from the essence of the invention are within the scope of the present invention.

[0024] Specific Implementation Method 1; This implementation method employs a method for preparing beryllium copper-based high-entropy alloy strips using vacuum magnetic levitation. The method includes the following steps:

[0025] I. Vacuum Magnetic Levitation Casting

[0026] Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixture is placed inside the induction coil of a vacuum magnetic levitation melting equipment. The vacuum chamber is then closed and evacuated to 10⁻³~10⁻ 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1200~1350℃, holds it at that temperature for 15~20min, and obtains a uniform alloy molten pool.

[0027] II. Throwing

[0028] The molten alloy is drawn into the lower molten pool and the die opening by gravity. The cooling rate of the die opening is controlled at 50~100℃ / s, resulting in a Cu-Be-Al-Mg-Y-Ce alloy slab with a thickness of 1mm and a coil weight of 100kg~400kg. The Be, Mg, Al, Y, and Ce element contents are 1.8~2.3wt.%, 0.05~0.6wt.%, 0.05~0.6wt.%, 0.05~0.6wt.%, and 0.05~0.6wt.%, respectively.

[0029] III. Quenching, mechanical cleaning, and winding

[0030] After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6 μm. The slab is then wound on a winding machine at a winding tension of 5~8 kN and a winding speed of 10~15 m / min to obtain coils with a diameter of 300~400 mm for later use.

[0031] IV. Rolling

[0032] The billet is heated to 750℃~800℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopts reciprocating rolling, with a reduction of 10%-15% per pass and a total reduction of 30%-40%. The rolling speed is 5m / min, resulting in Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.24mm~0.28mm and a width of 80mm. It is then annealed online in H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm.

[0033] V. Edge trimming, bending and straightening

[0034] After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in an H2 atmosphere, the edges are trimmed, and then it is straightened by tension bending on a straightening machine.

[0035] VI. AC cleaning and winding

[0036] The Cu-Be-Al-Mg-Y-Ce alloy slab is placed on the worktable of an electromechanical cleaning device. The power supply is turned on and the voltage is adjusted to 8~12V. Simultaneously, the bronze wire mechanical cleaning device is started, with the rotation speed controlled at 250~300 r / min, the cleaning pressure at 0.15~0.2 MPa, and the processing time at 4~6 min, to remove stubborn oxide scale and rust from the surface. Then, the power supply voltage is adjusted to 5~8V, the bronze wire mechanical cleaning wheel is turned off, and the stainless steel wire cleaning wheel is turned on. The rotation speed is reduced to 180~220 r / min, the cleaning pressure is adjusted to 0.1~0.15 MPa, and the processing time at 3~5 min. After the two cleaning processes are completed, the Cu-Be-Al-Mg-Y-Ce alloy is fed forward. The two cleaning processes are repeated for the parts that have not undergone the cleaning process. The slab is then wound up to obtain a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm.

[0037] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that the melting heating temperature in step one is 1300℃, and the other steps are the same as in Specific Implementation Method One.

[0038] Specific Implementation Method 3: The difference between this implementation method and Specific Implementation Method 1 or 2 is that the number of vacuum magnetic levitation melting devices used in step 1 is 2, and the other steps are the same as those in Specific Implementation Method 1 or 2.

[0039] Specific Implementation Method Four: The difference between this implementation method and Specific Implementation Methods One to Three is that the Be content of the Cu-Be-Al-Mg-Y-Ce alloy slab mentioned in step two is 1.8 wt.%; the contents of Mg, Al, Y, and Ce elements are 0.2 wt.%, 0.2 wt.%, 0.2 wt.%, and 0.2 wt.% respectively, and the other steps are the same as those in Specific Implementation Methods One to Three.

[0040] Specific Implementation Method 5: The difference between this implementation method and Specific Implementation Methods 1 to 4 is that the weight of the Cu-Be-Al-Mg-Y-Ce alloy coil described in step 2 is 200 kg, and the other steps are the same as those in Specific Implementation Methods 1 to 4.

[0041] Specific Implementation Method Six: The difference between this implementation method and Specific Implementation Methods One to Five is that the rolling temperature in step four is 780°C, the reduction per pass is 12%, and the total reduction is 72%. The other steps are the same as those in Specific Implementation Methods One to Five.

[0042] Specific Implementation Method Seven: The difference between this implementation method and Specific Implementation Methods One to Six is ​​that the Cu-Be-Al-Mg-Y-Ce alloy plate obtained by six-roll rolling in step four has a thickness of 0.28mm, and the other steps are the same as those in Specific Implementation Methods One to Six.

[0043] Specific Implementation Method Eight: The difference between this implementation method and Specific Implementation Methods One to Seven is that the power supply voltage of the bronze wire mechanical cleaning device described in step six is ​​10V, the rotation speed is 280 r / min, the cleaning pressure is 0.18 MPa, and the time is 5 min. Other steps are the same as those in Specific Implementation Methods One to Seven.

[0044] Specific Implementation Method Nine: The difference between this implementation method and Specific Implementation Methods One to Eight is that the power supply voltage of the stainless steel wire cleaning wheel device described in step six is ​​6 V, the rotation speed is 200 r / min, the cleaning pressure is 0.12 MPa, and the time is 4 min. The other steps are the same as those in Specific Implementation Methods One to Eight.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] Example 1: A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation is completed according to the following steps:

[0047] I. Vacuum Magnetic Levitation Casting

[0048] Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixture is placed inside the induction coil of a vacuum magnetic levitation melting equipment, the chamber is closed, and a vacuum of 10⁻⁻⁶ is applied. 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1350℃, holds it at that temperature for 15~20min, and obtains a uniform alloy molten pool.

[0049] II. Throwing

[0050] The molten alloy is allowed to flow into the lower molten pool and the mold opening respectively by gravity. The cooling rate of the mold opening is controlled at 100℃ / s to obtain a 100 Kg Cu-Be-Al-Mg-Y-Ce alloy slab with a thickness of 1 mm. The alloy composition is shown in Table 1.

[0051] Table 1. Composition of Cu-Be-Al-Mg-Y-Ce alloy strip (wt.%) Be Mg Al Y Ce Ni Fe Cd Pb Cu 2.0 0.4 0.4 0.4 0.4 0.05 0.03 0.003 0.004 other

[0052] III. Quenching, mechanical cleaning, and winding

[0053] After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6μm. The slab is then wound on a winding machine at a winding tension of 8 kN and a winding speed of 15m / min to obtain coils with a diameter of 300~400mm for later use.

[0054] IV. Rolling

[0055] The billet was heated to 800℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopted reciprocating rolling, with a reduction of 15% per pass and a total reduction of 75%. The rolling speed was 5m / min, resulting in a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.25mm and a width of 80mm. It was then annealed online in an H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm.

[0056] V. Edge trimming, bending and straightening

[0057] After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in H2 atmosphere, the edges are trimmed and then straightened by tension bending on a straightening machine.

[0058] VI. AC cleaning and winding

[0059] The Cu-Be-Al-Mg-Y-Ce alloy slab was placed on the worktable of an electromechanical cleaning device. The power supply was turned on and the voltage was adjusted to 12V. Simultaneously, the bronze wire mechanical cleaning device was started, with the rotation speed controlled at 300 r / min, the cleaning pressure at 0.2MPa, and the processing time at 6 min, to remove stubborn oxide scale and rust from the surface. Subsequently, the power supply voltage was adjusted to 8V, the bronze wire mechanical cleaning wheel was turned off, and the stainless steel wire cleaning wheel was turned on. The rotation speed was reduced to 220 r / min, the cleaning pressure was adjusted to 0.15 MPa, and the processing time was 5 min. After the two cleaning processes were completed, the Cu-Be-Al-Mg-Y-Ce alloy was fed forward. The parts that had not undergone the cleaning process were cleaned again for two more cleaning processes to obtain a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm. The peak secondary electron emission coefficient of the obtained Cu-Be-Al-Mg-Y-Ce alloy strip was 9.3.

[0060] Example 2: A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation is completed according to the following steps:

[0061] I. Vacuum Magnetic Levitation Casting

[0062] Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixtures are placed inside the induction coils of two vacuum magnetic levitation melting machines. The empty chambers are closed and a vacuum of 10⁻⁻⁶ is created. 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1300℃, holds it at that temperature for 15~20 min, and obtains a uniform alloy molten pool.

[0063] II. Throwing

[0064] The molten alloy is controlled by electromagnetic force to flow into the lower molten pool and the mold opening respectively. The cooling rate of the mold opening is controlled at 100℃ / s to obtain a 200 kg Cu-Be-Al-Mg-Y-Ce alloy slab with a thickness of 1 mm. The alloy composition is shown in Table 2.

[0065] Table 2. Composition of Cu-Be-Al-Mg-Y-Ce alloy strip (wt.%) Be Mg Al Y Ce Ni Fe Cd Pb Cu 1.9 0.3 0.3 0.3 0.3 0.04 0.04 0.005 0.004 other

[0066] III. Quenching, mechanical cleaning, and winding

[0067] After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6μm. The slab is then wound on a winding machine at a winding tension of 8 kN and a winding speed of 15 m / min to obtain a coil with a diameter of 350 mm for later use.

[0068] IV. Rolling

[0069] The billet was heated to 780℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopted reciprocating rolling, with a reduction of 12% per pass and a total reduction of 72%. The rolling speed was 5m / min, resulting in a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.28mm and a width of 80mm. It was then annealed online in an H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm.

[0070] V. Edge trimming, bending and straightening

[0071] After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in an H2 atmosphere, the edges are trimmed, and then it is straightened by tension bending on a straightening machine.

[0072] VI. AC cleaning and winding

[0073] The Cu-Be-Al-Mg-Y-Ce alloy slab was placed on the worktable of an electromechanical cleaning device. The power supply was turned on and the voltage was adjusted to 10 V. Simultaneously, the bronze wire mechanical cleaning device was started, with the rotation speed controlled at 280 r / min, the cleaning pressure at 0.18 MPa, and the processing time at 5 min, to remove stubborn oxide scale and rust from the surface. Subsequently, the power supply voltage was adjusted to 6 V, the bronze wire mechanical cleaning wheel was turned off, and the stainless steel wire cleaning wheel was turned on. The rotation speed was reduced to 200 r / min, the cleaning pressure was adjusted to 0.12 MPa, and the processing time was 4 min. After the two cleaning processes were completed, the Cu-Be-Al-Mg-Y-Ce alloy was fed forward. The two cleaning processes were repeated for the parts that had not undergone the cleaning process, resulting in a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm. The peak secondary electron emission coefficient of the obtained Cu-Be-Al-Mg-Y-Ce alloy strip was 8.8.

[0074] Example 3: A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation is completed according to the following steps:

[0075] I. Vacuum Magnetic Levitation Casting

[0076] Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixtures are placed inside the induction coils of two vacuum magnetic levitation melting machines. The empty chambers are closed and a vacuum of 10⁻⁻⁶ is created. 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1250℃, holds it at that temperature for 15~20 min, and obtains a uniform alloy molten pool (after one batch of molten material is drawn into billets, the next batch is immediately opened, and the raw materials are re-batched and heated, and this process is repeated twice).

[0077] II. Throwing

[0078] The molten alloy is allowed to flow into the lower molten pool and the mold opening respectively by gravity. The cooling rate of the mold opening is controlled at 100℃ / s to obtain a 400 kg Cu-Be-Al-Mg-Y-Ce alloy slab with a thickness of 1 mm. The alloy composition is shown in Table 3.

[0079] Table 3. Composition of Cu-Be-Al-Mg-Y-Ce alloy strip (wt.%) Be Mg Al Y Ce Ni Fe Cd Pb Cu 1.8 0.2 0.2 0.2 0.2 0.03 0.05 0.004 0.003 other

[0080] III. Quenching, mechanical cleaning, and winding

[0081] After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6μm. The slab is then wound on a winding machine at a winding tension of 8 kN and a winding speed of 15 m / min to obtain a coil with a diameter of 350 mm for later use.

[0082] IV. Rolling

[0083] The billet was heated to 750℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopted reciprocating rolling, with a reduction of 9.5% per pass and a total reduction of 76%. The rolling speed was 5m / min, resulting in a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.24mm and a width of 80mm. It was then annealed online in an H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain a Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm.

[0084] V. Edge trimming, bending and straightening

[0085] After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in H2 atmosphere, the edges are trimmed and then straightened by tension bending on a straightening machine.

[0086] VI. AC cleaning

[0087] The Cu-Be-Al-Mg-Y-Ce alloy slab was placed on the worktable of an electromechanical cleaning device. The power supply was turned on and the voltage was adjusted to 8 V. Simultaneously, the bronze wire mechanical cleaning device was started, with the rotation speed controlled at 250 r / min, the cleaning pressure at 0.15 MPa, and the processing time at 4 min, to remove stubborn oxide scale and rust from the surface. Subsequently, the power supply voltage was adjusted to 6 V, the bronze wire mechanical cleaning wheel was turned off, and the stainless steel wire cleaning wheel was turned on. The rotation speed was reduced to 180 r / min, the cleaning pressure was adjusted to 0.10 MPa, and the processing time was 3 min. After the two cleaning processes were completed, the Cu-Be-Al-Mg-Y-Ce alloy was fed forward. The two cleaning processes were repeated for the parts that had not undergone the cleaning process, resulting in a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm. The peak secondary electron emission coefficient of the obtained Cu-Be-Al-Mg-Y-Ce alloy strip was 8.1.

Claims

1. A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation, characterized in that... A method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation is completed according to the following steps: I. Vacuum Magnetic Levitation Casting Using pure copper, Cu-10wt.%Be master alloy, Cu-10wt.%Mg master alloy, Cu-10wt.%Al master alloy, Cu-10wt.%Y master alloy, and Cu-1.0wt.%Ce master alloy as raw materials, the prepared mixture is placed inside the induction coil of a vacuum magnetic levitation melting equipment. The vacuum chamber is then closed and evacuated to 10⁻³~10⁻ 4 Pa, under the action of a high-frequency electromagnetic field, suspends the raw material and heats it to 1200~1350℃, holds it at that temperature for 15~20min, and obtains a uniform alloy molten pool; II. Throwing The molten alloy is drawn into the molten pool below and the die opening by gravity. The cooling rate of the die opening is controlled at 50~100℃ / s to obtain Cu-Be-Al-Mg-Y-Ce alloy slabs with a thickness of 1mm and a roll weight of 100kg~400kg, containing 1.8~2.3 wt.%, 0.05~0.6 wt.%, 0.05~0.6 wt.%, 0.05~0.6 wt.%, and 0.05~0.6 wt.%, respectively. III. Quenching, mechanical cleaning, and winding After quenching, the surface contaminants of the Cu-Be-Al-Mg-Y-Ce alloy slab are mechanically cleaned to obtain a clean slab with a surface roughness Ra≤1.6 μm. The slab is then wound on a winding machine at a tension of 5~8 kN and a winding speed of 10~15 m / min to obtain coils with a diameter of 300~400 mm for later use. IV. Rolling The billet is heated to 750℃~800℃, rolled on a four-high mill, and then rolled on a six-high mill. The rolling process adopts reciprocating rolling, with a reduction of 10%-15% per pass and a total reduction of 30%-40%. The rolling speed is 5m / min, resulting in Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.24mm~0.28mm and a width of 80mm. It is then annealed online in H2 atmosphere and subsequently finished rolled on a twenty-high mill to obtain Cu-Be-Al-Mg-Y-Ce alloy sheet with a thickness of 0.2mm. V. Edge trimming, bending and straightening After the rolled Cu-Be-Al-Mg-Y-Ce alloy sheet is annealed online in H2 atmosphere, the edges are trimmed and then straightened by tension bending on a straightening machine. VI. AC cleaning and winding The Cu-Be-Al-Mg-Y-Ce alloy slab is placed on the worktable of an electromechanical cleaning device. The power supply is turned on and the voltage is adjusted to 8~12V. Simultaneously, the bronze wire mechanical cleaning device is started, with the rotation speed controlled at 250~300 r / min, the cleaning pressure at 0.15~0.2 MPa, and the processing time at 4~6 min, to remove stubborn oxide scale and rust from the surface. Then, the power supply voltage is adjusted to 5~8V, the bronze wire mechanical cleaning wheel is turned off, and the stainless steel wire cleaning wheel is turned on. The rotation speed is reduced to 180~220 r / min, the cleaning pressure is adjusted to 0.1~0.15 MPa, and the processing time at 3~5 min. After the two cleaning processes are completed, the Cu-Be-Al-Mg-Y-Ce alloy is fed forward. The two cleaning processes are repeated for the parts that have not undergone the cleaning process. The slab is then wound up to obtain a bright Cu-Be-Al-Mg-Y-Ce alloy strip with a surface roughness Ra≤0.8μm.

2. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The heating temperature in step one is 1200~1350℃, and the holding time is 15~20min.

3. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The Cu-Be-Al-Mg-Y-Ce alloy smelting process described in step one incorporates multiple elements such as Be, Al, Mg, Y, and Ce.

4. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The thickness of the Cu-Be-Al-Mg-Y-Ce alloy slab smelted in step two is 1 mm.

5. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The coil weight of the Cu-Be-Al-Mg-Y-Ce alloy slab smelted in step two is 100kg ~ 400kg.

6. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The Be, Mg, Al, Y, and Ce content of the Cu-Be-Al-Mg-Y-Ce alloy slab mentioned in step two is 1.8~2.3 wt.%, 0.05~0.6 wt.%, 0.05~0.6 wt.%, 0.05~0.6 wt.%, and 0.05~0.6 wt.%, respectively.

7. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The rolling method described in step four is reciprocating rolling. The Cu-Be-Al-Mg-Y-Ce alloy plate obtained by six-roll rolling has a thickness of 0.24mm~0.28mm and a width of 80mm.

8. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The cleaning method described in step six is ​​alternating current cleaning.

9. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The mechanical cleaning device for bronze wire described in step six has a power supply voltage of 8~12 V, a rotation speed of 250~300 r / min, a cleaning pressure of 0.15~0.2 MPa, and a cleaning time of 4~6 min.

10. The method for preparing beryllium copper-based high-entropy alloy strip using vacuum magnetic levitation according to claim 1, characterized in that... The stainless steel wire cleaning wheel device described in step six has a power supply voltage of 5~8V, a rotation speed of 180~220 r / min, a cleaning pressure of 0.1~0.15 MPa, and a cleaning time of 3~5 min.

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