Method for electromagnetically-assisted preparation of copper-iron alloy

Abstract

The invention belongs to the technical field of alloy preparation, and particularly relates to a method for electromagnetically-assisted preparation of a copper-iron alloy. The method for preparing the copper-iron alloy through magnetic assistance comprises the following steps that corresponding raw materials are taken according to the composition of the designed copper-iron alloy to be smelted, and alloy melt is obtained; casting or continuously casting the alloy melt to obtain a copper-iron alloy casting blank; the casting or continuous casting comprises the steps that alloy melt is subjected to cooling crystallization under the electromagnetic stirring condition, the cooling speed of cooling crystallization is 260-450 DEG C / s, a base body of the copper-iron alloy is Cu, and the content of Fe is 5-20 wt%. Electromagnetic stirring is carried out in the casting or continuous casting process, the cooling speed is controlled, through the coupling effect of the electromagnetic stirring and the cooling speed, uniform distribution of a Fe phase can be promoted, macrosegregation can be remarkably improved, meanwhile, the cooling speed is controlled, the problems of coarse primary Fe dendritic crystals and serious segregation caused by liquid-liquid phase separation are solved, and the strength, the conductivity and the electromagnetic shielding performance of the copper-iron alloy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of alloy preparation, and in particular to a method for preparing a copper-iron alloy with electromagnetic assistance. Background Art

[0002] Copper-iron (Cu-Fe) alloy has become an ideal high-performance copper alloy material with structural-functional integration due to its excellent mechanical properties, high electrical conductivity, high thermal conductivity and excellent electromagnetic shielding performance. It is widely used in mobile phone CPU shielding covers, radio frequency lines, electromagnetic shielding wires for high-speed motors of drones, shielding layers of coaxial cables, CT / MRI rooms, etc. With the rapid development of the electronic information industry, its key components are becoming more and more miniaturized, integrated, high-precision and in more and more demanding in service conditions, which requires Cu-Fe alloy materials to simultaneously meet: external stable and reliable structural characteristics and internal all-round functional characteristics.

[0003] However, the Cu-Fe alloy has a metastable liquid immiscible zone below the liquidus, which is a metastable immiscible alloy, that is, there is a metastable immiscible gap between the copper and iron liquid phases below the liquidus, that is, when the alloy melt is supercooled to below the metastable solubility curve, the alloy supercooled melt will tend to undergo liquid phase separation. When the intersection of the composition and temperature of the supercooled melt is located inside it, the original alloy melt with uniform composition will spontaneously decompose into two liquid phases with different compositions. This alloy is prone to spatial phase separation organization and large-scale component segregation during solidification under conventional gravity field conditions. At the same time, the genetic characteristics of the organization of the Cu-Fe alloy affect the subsequent processing and performance. Therefore, obtaining a fine and dispersed Fe phase and grain refinement at the same time is a prerequisite for preparing high-performance copper-iron alloys.

[0004] The Chinese invention patent with application publication number CN108842091A, which was applied for and published on November 20, 2018, discloses a method for preparing Cu-Cr alloy by magnetic field / ultrasonic field coupling. During the solidification process, a magnetic field and an ultrasonic field are simultaneously applied to control the solidification of the Cu-Cr alloy, which significantly refines the Cr dendrites and reduces Cr segregation, so that after subsequent cold deformation processing, the material has a uniformly distributed fine Cr fiber phase dispersed in the matrix, thereby greatly improving the strength of the material.

[0005] However, the liquid phase immiscible gap of Cu-Cr alloy is smaller than that of Cu-Fe alloy, that is, Cu-Fe alloy is more prone to liquid phase separation, thereby forming a severely segregated structure. The above method will not change the phase separation and composition segregation of Cu-Fe alloy during the solidification process, and will still form Fe-rich dendrites or coarse Fe phase particles and other structures, thereby affecting the subsequent processing performance, conductivity and mechanical properties. Summary of the invention

[0006] The invention provides an electromagnetic-assisted method for preparing a copper-iron alloy, which solves the problems of coarse Fe phase dendrites and Fe phase segregation in the preparation of the copper-iron alloy in the prior art.

[0007] In order to solve the above technical problems, the technical solution of the electromagnetic assisted method for preparing copper-iron alloy of the present invention is: A method for preparing a copper-iron alloy with electromagnetic assistance comprises the following steps: taking corresponding raw materials according to the designed composition of the copper-iron alloy for smelting to obtain a molten alloy; casting or continuously casting the molten alloy to obtain a copper-iron alloy ingot; the casting or continuously casting comprises cooling and crystallizing the molten alloy under electromagnetic stirring conditions, the cooling rate of the cooling crystallization is 260-450°C / s, the matrix of the copper-iron alloy is Cu, and the Fe content is 5-20wt%.

[0008] The invention improves the prior art and provides an electromagnetic-assisted method for preparing a copper-iron alloy. The invention realizes "layer-by-layer solidification" by coupling electromagnetic stirring and controlling the cooling rate during the casting or continuous casting process. The above-mentioned method can effectively inhibit the floating migration of the Fe phase due to the difference in specific gravity, promote the uniform distribution of the Fe phase, and significantly improve the macro-segregation. Meanwhile, the cooling rate can be controlled to rapidly cool the copper-iron alloy solution, realize the rapid solidification of the copper-iron alloy solution, realize a single liquid-solid phase transition, avoid the coexistence of two solidification behaviors of liquid-liquid phase separation and liquid-solid phase transition, solve the problems of coarse primary Fe dendrites and serious segregation caused by liquid-liquid phase separation, make the Fe phase fine and evenly distributed in the copper matrix, and obtain a Cu-Fe alloy with fine grains. After the material is subsequently deformed, a uniformly fine Fe fiber phase is dispersed in the matrix, and the strength of the material is greatly improved. In addition, the electromagnetic field can effectively reduce the Fe content of the solid solution in the Cu matrix, promote the precipitation of Fe atoms and the dispersed distribution of the precipitation phase, and is conducive to improving the strength and electrical conductivity.

[0009] The electromagnetic-assisted method for preparing copper-iron alloy provided by the present invention has simple process and low cost, and can prepare copper-iron alloy ingots with good comprehensive performance in the casting stage, which is conducive to subsequent processing and forming, and at the same time obtains excellent electrical conductivity and strength.

[0010] In order to further enhance the forced convection effect, improve the uniform distribution of the Fe phase, and improve the macroscopic deviation, preferably, the stirring current during the electromagnetic stirring is 5-100A, and the stirring frequency is 10-200Hz.

[0011] In order to further improve the mechanical properties and electrical conductivity of the copper-iron alloy, preferably, the composition of the copper-iron alloy is: Fe 5-20wt%, Ag 0.2-0.4wt%, Mg 0.1-0.3wt%, Y 0.05-0.3wt%, Cr 0.1-0.5wt%, and the rest is Cu. The Mg and Cr elements in the copper-iron alloy components can significantly increase the work hardening rate of the alloy while slightly reducing the electrical conductivity, thereby improving the mechanical properties of the alloy; Ag and Mg can reduce the solid solubility of Fe in the Cu matrix, and can effectively promote the precipitation of supersaturated Fe atoms; Y purifies impurities in the alloy, reduces the lattice distortion caused by solid-solution impurities, reduces the elastic scattering of electrons by the lattice, improves the electrical conductivity of the material, and promotes the precipitation of the Fe phase, reduces the solid solubility of Fe atoms in the copper matrix, and improves the electrical conductivity of the Cu-Fe alloy. In addition, rare earth elements can refine the grains and the Fe phase dendrite structure, promote the uniform distribution of the Fe phase in the matrix, and is beneficial to the improvement of the mechanical properties of the material.

[0012] In order to further alleviate the liquid-liquid phase separation, preferably, the casting temperature during the casting or continuous casting is 1300-1400° C., and the casting speed during the casting or continuous casting is 15-20 kg / min.

[0013] In order to further improve the uniformity of alloy components, preferably, the smelting temperature is 1300-1600°C.

[0014] In order to further improve the strength and electrical conductivity of the alloy, preferably, after the casting or continuous casting is completed, an ingot is obtained, and the ingot is subjected to homogenization annealing, hot rolling, cold deformation processing and aging treatment.

[0015] In order to further homogenize the chemical composition and structure of the alloy, preferably, the homogenization annealing is carried out in an inert gas at 900-950° C. for 5-20 hours.

[0016] In order to further improve the strength of the alloy, preferably, the hot rolling temperature is 800-950° C., and the hot rolling deformation is 60-80%.

[0017] In order to further improve the dispersion strengthening of the Fe phase, preferably, the deformation amount of the cold deformation process is 50-98%; annealing is performed 1-2 times during the cold deformation process, the annealing temperature is 400-450°C, and the annealing time is 1-2 hours. After the cold deformation process, a uniformly distributed and fine Fe fiber phase is formed in the matrix, which can greatly improve the strength of the material, and annealing can improve the uniformity of the dispersion distribution of the Fe phase.

[0018] In order to further improve the strength of the alloy, preferably, the temperature of the aging treatment is 400-450° C., and the time of the aging treatment is 4-20 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the casting process of Example 1 of the present invention; Figure 2 Schematic diagram of the continuous casting process of Example 2 of the present invention; Figure 3 The microstructure morphology diagrams of the copper-iron alloys of Example 1 of the present invention and Comparative Example 1 are shown. DETAILED DESCRIPTION

[0020] The technical concept of the electromagnetic-assisted method for preparing copper-iron alloy of the present invention is as follows: A method for preparing a copper-iron alloy with electromagnetic assistance comprises the following steps: taking corresponding raw materials according to the designed composition of the copper-iron alloy for smelting to obtain a molten alloy; casting or continuously casting the molten alloy to obtain a copper-iron alloy ingot; the casting or continuously casting comprises cooling and crystallizing the molten alloy under electromagnetic stirring conditions, the cooling rate of the cooling crystallization is 260-450°C / s, the matrix of the copper-iron alloy is Cu, and the Fe content is 5-20wt%.

[0021] Since the Cu-Fe alloy has a metastable liquid immiscible zone below the liquidus, and the melting points of copper and iron are quite different, the melting point of copper is 1083°C, and the melting point of iron is 1534°C, spatial phase separation is easily generated during solidification in a gravity field, resulting in large-scale component segregation. The present invention performs electromagnetic stirring and controls the cooling rate during casting or continuous casting. The electromagnetic stirring uses the electromagnetic force induced in the liquid phase cavity of the ingot to strengthen the flow of the melt in the liquid phase cavity, thereby strengthening the convection, heat transfer and mass transfer processes of the melt, overcoming the phase separation of the copper-iron alloy melt under the gravity field. The coupling effect of the two effectively inhibits the floating migration of the Fe phase due to the specific gravity difference, promotes the uniform distribution of the Fe phase, significantly improves the macro segregation, and controls the cooling rate. The cooling rate can make the copper-iron alloy solution cool quickly, realize the rapid solidification of the copper-iron alloy solution, form a similar "layer-by-layer solidification", realize a single liquid-solid phase transition, avoid the coexistence of liquid-liquid phase separation and liquid-solid phase transition, solve the problems of coarse primary Fe dendrites and serious segregation caused by liquid-liquid phase separation, make the Fe phase fine and evenly distributed in the copper matrix, and obtain a Cu-Fe alloy with fine grains at the same time, so that the material can be dispersed in the matrix after subsequent deformation processing. Even and fine Fe fiber phases are dispersed, greatly improving the strength of the material; in addition, the electromagnetic field can effectively reduce the Fe content of the solid solution in the Cu matrix, promote the precipitation of Fe atoms and the dispersed distribution of the precipitated phase, which is beneficial to improving the strength and conductivity.

[0022] The present invention adopts a copper crystallizer. Due to the excessively fast cooling rate of the alloy melt in the copper plate mold, the alloy solution is continuously poured, and the liquid-solid phase transition cannot be recorded by the traditional temperature measurement method. The crystallizer structure is complex, and under the action of the external field, observation and measurement are more difficult. Therefore, with the help of Curiotto et al. (Effect of cooling rate on the solidification of Cu 58 Co 42 ) is estimated using the empirical formula proposed in the study of copper alloy solidification, the formula is as follows: , where k and n are constants, z is the distance from the center of the crystallizer to the inner wall of the crystallizer, and the mold is not cooled. For the present invention, the casting speed and the inlet and outlet temperatures are controlled to achieve rapid solidification layer by layer. The k value is taken as 2042, the n value is -1.8, and the z value is replaced by the liquid level height. When the pouring thickness per second is 1mm / s~3mm / s, the cooling rate is 283℃ / s~2042℃ / s. When the present invention adopts continuous pouring, considering factors such as the time required for the alloy liquid surface to spread and the heat conduction between the alloy liquid and the surrounding mold, there will be deviations in the cooling rate. The cooling rate range is determined by empirical formula calculation and organizational analysis.

[0023] In a specific implementation, the water temperature at the water inlet of the crystallizer is controlled to be 20-25°C, and the temperature difference between the water temperature at the inlet and outlet of the crystallizer is controlled to be 6-25°C; the cooling rate of the melt is controlled by cooling the cooling water of the crystallizer and the casting rate of the melt.

[0024] In a specific embodiment, an inert gas is introduced between the runner and the crystallizer during the casting process to avoid oxidation and the introduction of impurities that affect the quality of the alloy.

[0025] The implementation manner of the present invention is further described below in conjunction with specific examples.

[0026] 1. Specific embodiments of the electromagnetic-assisted method for preparing copper-iron alloy of the present invention Example 1 The flowchart of the electromagnetic-assisted method for preparing copper-iron alloy in this embodiment is as follows: Figure 1 As shown, the method for electromagnetically assisted preparation of copper-iron alloy is as follows: (1) Smelting: The copper-iron alloy has the following composition: Fe 5wt%, Ag 0.2wt%, Mg 0.1%, Y 0.05%, Cr 0.1%, and the rest is Cu. According to the designed composition of the copper-iron alloy, the corresponding raw materials are taken in a smelting furnace for smelting, and the electrolytic copper, pure iron, pure silver, pure magnesium, yttrium and pure chromium are heated to 1300° C. to ensure that the raw materials are in a molten state. When the raw materials begin to melt and form a fluid, a covering agent is added to prevent oxidation of the alloy melt. After all the raw materials are melted, the heat is kept for 10 minutes. Under the protection of inert gas, the raw materials are stirred evenly and then the slag is fully skimmed until the melt is clean and clear, thereby obtaining a copper-iron alloy melt.

[0027] (2) Casting: Using the casting process, open the stopper rod of the smelting furnace to make the casting speed 19kg / min, turn on the cooling water of the electromagnetic stirrer and the crystallizer before casting, the stirring current of the electromagnetic stirrer is 5A, the stirring frequency is 10Hz, the water temperature at the water inlet of the crystallizer is controlled to be 20~25℃, and the water temperature difference between the inlet and outlet of the crystallizer is controlled to be 25℃, so that the cooling rate during casting is 260~360℃ / s, and the copper-iron alloy melt is cast at 1300℃. After the casting is completed, an inert gas argon is introduced between the runner and the crystallizer during the casting process to avoid oxidation and the introduction of impurities that affect the quality of the alloy. Other embodiments may use a continuous casting process. The schematic diagram of the continuous casting process is shown in FIG. Figure 2 shown.

[0028] (3) Homogenization annealing: The ingot is subjected to homogenization annealing treatment at 900°C in an inert gas for 20 h to obtain a homogenized ingot.

[0029] (4) Rolling: The homogenized ingot is hot rolled at 800°C with a deformation of 60%.

[0030] (5) Cold deformation processing: cold deformation processing is carried out after hot rolling. When the deformation amount of cold deformation processing is 25%, annealing is carried out once. The annealing temperature is 400℃ and the annealing time is 2h. After annealing is completed, cold deformation processing is continued to make the deformation amount reach 50%.

[0031] (6) Aging treatment: After cold deformation, aging treatment is carried out at 450°C for 4 hours.

[0032] Example 2 The electromagnetic-assisted method for preparing copper-iron alloy in this embodiment is as follows: (1) Smelting: The copper-iron alloy has the following composition: Fe 10wt%, Ag 0.4wt%, Mg 0.3%, Y 0.3%, Cr 0.5%, and the rest is Cu. According to the designed composition of the copper-iron alloy, the corresponding raw materials are taken in a smelting furnace for smelting, and the electrolytic copper, pure iron, pure silver, pure magnesium, yttrium and pure chromium are heated to 1450° C. to ensure that the raw materials are in a molten state. When the raw materials begin to melt and form a fluid, a covering agent is added to prevent oxidation of the alloy melt. After all the raw materials are melted, the heat is kept for 10 minutes. Under the protection of inert gas, the raw materials are stirred evenly and then the slag is fully skimmed until the melt is clean and clear, thereby obtaining a copper-iron alloy melt.

[0033] (2) Casting: The continuous casting process is adopted. The schematic diagram of the continuous casting process is as follows Figure 2 As shown, the stopper rod of the smelting furnace is opened to make the casting speed 17kg / min, and the cooling water of the electromagnetic stirrer and the crystallizer is turned on before casting. The stirring current of the electromagnetic stirrer is 100A, the stirring frequency is 200Hz, the water temperature at the water inlet of the crystallizer is controlled to be 20~25℃, and the water temperature difference at the inlet and outlet of the crystallizer is controlled to be 20℃, so that the cooling rate during casting is 280~380℃ / s, and the copper-iron alloy melt is cast at 1350℃. After the casting is completed, it is sprayed at the first level and the second level, and then passed through the continuous casting machine to obtain the ingot. During the casting process, inert gas argon is introduced between the runner and the crystallizer to avoid oxidation and the introduction of impurities that affect the quality of the alloy.

[0034] (3) Homogenization annealing: The ingot is subjected to homogenization annealing treatment at 950°C in an inert gas for 5 h to obtain a homogenized ingot.

[0035] (4) Rolling: The homogenized ingot is hot rolled at 900°C with a deformation of 70%.

[0036] (5) Cold deformation processing: cold deformation processing is carried out after hot rolling. When the deformation amount of cold deformation processing is 40%, annealing is carried out once. The annealing temperature is 450℃ and the annealing time is 1h. After annealing is completed, cold deformation processing is continued to make the deformation amount reach 60%.

[0037] (6) Aging treatment: Aging treatment at 400°C for 20h after cold deformation.

[0038] Example 3 The electromagnetic-assisted method for preparing copper-iron alloy in this embodiment is as follows: (1) Smelting: The copper-iron alloy has the following composition: Fe 20wt%, Ag 0.2wt%, Mg 0.1%, Y 0.1%, Cr 0.1%, and the rest is Cu. According to the designed composition of the copper-iron alloy, the corresponding raw materials are taken in a smelting furnace for smelting, and the electrolytic copper, pure iron, pure silver, pure magnesium, yttrium and pure chromium are heated to 1600° C. to ensure that the raw materials are in a molten state. When the raw materials begin to melt and form a fluid, a covering agent is added to prevent oxidation of the alloy melt. After all the raw materials are melted, the heat is kept for 10 minutes. Under the protection of inert gas, the raw materials are stirred evenly and then the slag is fully skimmed until the melt is clean and clear, thereby obtaining a copper-iron alloy melt.

[0039] (2) Casting: The casting process was adopted. The stopper rod of the smelting furnace was opened to make the casting speed 16 kg / min. The electromagnetic stirrer and the cooling water of the crystallizer were turned on before casting. The stirring current of the electromagnetic stirrer was 50 A, the stirring frequency was 100 Hz, the water temperature at the inlet of the crystallizer was controlled to be 20-25 °C, and the temperature difference between the inlet and outlet of the crystallizer was controlled to be 6 °C, so that the cooling rate during casting was 330-430 °C / s. The copper-iron alloy melt was cast at 1400 °C. After the casting was completed, an ingot was obtained. During the casting process, inert gas argon was introduced between the runner and the crystallizer to avoid oxidation and the introduction of impurities that would affect the quality of the alloy.

[0040] (3) Homogenization annealing: The ingot is subjected to homogenization annealing treatment at 900°C in an inert gas for 10 h to obtain a homogenized ingot.

[0041] (4) Rolling: The homogenized ingot is hot rolled at 950°C with a deformation of 80%.

[0042] (5) Cold deformation processing: cold deformation processing is carried out after hot rolling. When the deformation amount of cold deformation processing is 40%, annealing is carried out once, and when the deformation amount is 70%, annealing is carried out once. The temperature of the two annealings is 400℃, and the annealing time is 2h. After annealing is completed, cold deformation processing is continued to make the deformation amount reach 98%.

[0043] (6) Aging treatment: Aging treatment at 400°C for 10 h after cold deformation.

[0044] 2. Comparison Comparative Example 1 The electromagnetic-assisted method for preparing copper-iron alloy in this comparative example is basically the same as that in Example 1, except that: in step (2), a casting process is adopted, the stopper rod of the smelting furnace is opened, so that the casting speed is 5 kg / min, the cooling water of the electromagnetic stirrer and the crystallizer is turned on before casting, the stirring current of the electromagnetic stirrer is 5 A, the stirring frequency is 10 Hz, the water temperature at the water inlet of the crystallizer is controlled to be 20-25° C., and the temperature difference of the water temperature at the inlet and outlet of the crystallizer is controlled to be 55° C., so that the cooling speed during casting is 70-170° C. / s, the copper-iron alloy melt is cast at 1300° C., and an ingot is obtained after the casting is completed. During the casting process, inert gas argon is introduced between the runner and the crystallizer to avoid oxidation and the introduction of impurities that affect the quality of the alloy.

[0045] 3. Experimental Examples Experimental Example 1 In this experimental example, the microstructure morphology of the copper-iron alloy obtained in the embodiment and the comparative example is tested and observed. The microstructure morphology of the embodiment 1 (left) and the comparative example 1 (right) are shown in FIG. Figure 3 As shown, from Figure 3 It can be seen that the Fe phase in the copper-iron alloy prepared in Example 1 is fine and dispersed, while the Fe phase particles in the copper-iron alloy of Comparative Example 1 are coarse, the Fe phase dendrites are coarse, and the distribution is uneven. This shows that the copper-iron alloy preparation method of the present invention can promote the uniform distribution of the Fe phase, significantly improve the macro-segregation, solve the problems of coarse primary Fe dendrites and severe segregation caused by liquid-liquid phase separation, make the Fe phase fine and evenly distributed in the copper matrix, and obtain a Cu-Fe alloy with fine grains.

[0046] Experimental Example 2 In this experimental example, the mechanical properties of the copper-iron alloy obtained in the embodiment and the comparative example were tested by a universal mechanical testing machine, and the electrical conductivity of the copper-iron alloy was tested by a metal eddy current conductivity meter. The test results are shown in Table 1.

[0047] Table 1 Test results of mechanical properties and electrical conductivity of copper-iron alloy It can be seen from Table 1 that compared with Comparative Example 1, the tensile strength and electrical conductivity of the copper-iron alloy prepared in Example 1 are higher, indicating that the electromagnetic-assisted method for preparing the copper-iron alloy provided by the present invention can improve the tensile strength and electrical conductivity of the copper-iron alloy by controlling the cooling rate; in addition, the strength of the copper-iron alloy can be further improved by controlling the alloy composition, casting parameters and heat treatment conditions, but it will be accompanied by a decrease in electrical conductivity.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing copper-iron alloy by electromagnetic assistance, characterized in that: The following steps are involved: According to the designed copper-iron alloy composition, corresponding raw materials are smelted to obtain alloy melt; the alloy melt is cast or continuously cast to obtain copper-iron alloy ingot; the casting or continuous casting includes cooling and crystallizing the alloy melt under electromagnetic stirring conditions, the cooling rate of the cooling crystallization is 260-450°C / s, the copper-iron alloy matrix is ​​Cu, and the Fe content is 5-20wt%.

2. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 1, characterized in that: The stirring current during the electromagnetic stirring is 5-100A, and the stirring frequency is 10-200Hz.

3. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 1, characterized in that: The copper-iron alloy comprises: Fe 5-20wt%, Ag 0.2-0.4wt%, Mg 0.1-0.3wt%, Y 0.05-0.3wt%, Cr 0.1-0.5wt%, and the rest is Cu.

4. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 1, characterized in that: The casting temperature during the casting or continuous casting is 1300-1400° C., and the casting speed during the casting or continuous casting is 15-20 kg / min.

5. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 1, characterized in that: The smelting temperature is 1300-1600°C.

6. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 1, characterized in that: After the casting or continuous casting is completed, an ingot is obtained, and the ingot is subjected to homogenization annealing, hot rolling, cold deformation processing and aging treatment.

7. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 6, characterized in that: The homogenization annealing is carried out in an inert gas at 900-950° C. for 5-20 hours.

8. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 6, characterized in that: The hot rolling temperature is 800-950° C., and the hot rolling deformation is 60-80%.

9. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 6, characterized in that: The deformation amount of the cold deformation processing is 50-98%; annealing is performed 1-2 times during the cold deformation processing, the annealing temperature is 400-450° C., and the annealing time is 1-2 hours.

10. The electromagnetic-assisted method for preparing copper-iron alloy according to claim 6, characterized in that: The temperature of the aging treatment is 400-450° C., and the time of the aging treatment is 4-20 hours.

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