A high-performance copper-based alloy material for lead frames and its preparation method

Abstract

This invention discloses a high-performance copper-based alloy material for lead frames and its preparation method, comprising the following components by mass percentage: Fe: 0.4-0.6 wt%, Cr: 0.2-0.3 wt%, Ti: 0.2-0.3 wt%, Ni: 0.1-0.15 wt%, Zr: 0.1-0.15 wt%, Mg: 0.1-0.2 wt%, P: 0.05-0.1 wt%, Ca: 0.1-0.15 wt%, Ag: 0.1-0.2 wt%, with the balance being Cu. This invention achieves a high-performance copper-based alloy material through microalloying of elements such as Fe, Cr, Ni, Ti, Ca, and Ag, solid solution strengthening, aging precipitation strengthening, and deformation heat treatment.

Description

Technical Field

[0001] This invention relates to the field of metal materials technology, and in particular to a high-performance copper-based alloy material for lead frames and its preparation method. Background Technology

[0002] Leadframe copper strips, as the carrier of integrated circuits, primarily serve to connect external circuits, dissipate heat, and support the chip, making them a key component in forming electrical circuits. Leadframe copper strips must possess high strength, electrical and thermal conductivity, excellent high-temperature softening resistance, and electroplating properties to meet the demands of the integrated circuit packaging industry. Currently, there are three existing copper alloys for leadframes: Cu-Fe-P, Cu-Ni-Si, and Cu-Cr-Zr alloys. While Cu-Fe-P and Cu-Cr-Zr alloys exhibit excellent electrical and thermal conductivity, their strength is relatively low (<600 MPa), while Cu-Ni-Si, although possessing high strength, has a low conductivity (<50% IACS). How to effectively improve the strength, electrical and thermal conductivity of copper alloy materials for leadframes has become a research hotspot in the field of copper alloys, and is crucial for the industrialization of electronic information and integrated circuits. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a high-performance copper-based alloy material for lead frames and its preparation method. The method involves micro-alloying of elements such as Fe, Cr, Ni, Ti, Ca, and Ag to refine the microstructure, solid solution strengthening, and aging precipitation strengthening, followed by deformation heat treatment to obtain a copper-based alloy material with excellent comprehensive performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-performance copper-based alloy material for lead frames is composed of the following components by mass percentage: Fe: 0.4-0.6 wt%, Cr: 0.2-0.3 wt%, Ti: 0.2-0.3 wt%, Ni: 0.1-0.15 wt%, Zr: 0.1-0.15 wt%, Mg: 0.1-0.2 wt%, P: 0.05-0.1 wt%, Ca: 0.1-0.15 wt%, Ag: 0.1-0.2 wt%, with the balance being Cu.

[0006] Preferably, it is composed of the following components in the indicated mass percentages: Fe: 0.6 wt%, Cr: 0.3 wt%, Ti: 0.3 wt%, Ni: 0.15 wt%, Zr: 0.15 wt%, Mg: 0.2 wt%, P: 0.1 wt%, Ca: 0.1 wt%, Ag: 0.2 wt%, with the balance being Cu.

[0007] Preferably, it is composed of the following components in the indicated mass percentages: Fe: 0.4 wt%, Cr: 0.2 wt%, Ti: 0.2 wt%, Ni: 0.1 wt%, Zr: 0.1 wt%, Mg: 0.1 wt%, P: 0.05 wt%, Ca: 0.1 wt%, Ag: 0.1 wt%, with the balance being Cu.

[0008] This invention provides a method for preparing a high-performance copper-based alloy material for lead frames, comprising the following steps:

[0009] Step 1: After pretreatment, the raw materials are prepared according to the mass percentage. Then, the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag and Cu are added to the crucible of the vacuum induction furnace. After evacuation, argon gas is introduced into the furnace and smelting is carried out under the protection of pure argon gas. Then, current is applied to raise the temperature to 300-350℃ and hold for 2-3 minutes. Then, the temperature is raised to 780-800℃ and held for 2-3 minutes. Then, the temperature is raised to 1350-1400℃ and held for 5-10 minutes. The raw materials are melted evenly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot.

[0010] Step 2: Mill the surface of the ingot, then place it in a heat treatment furnace for homogenization under argon protection. The homogenization temperature is 920℃-950℃ and the time is controlled at 2-3 hours. Then cool it to room temperature with the furnace.

[0011] Step 3: Heat the homogenized ingot to 850-900℃, hold for 10-15 minutes and then hot roll it. The total deformation during hot rolling is 50-60%. Then air cool it to room temperature.

[0012] Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment. The solution treatment temperature is 980-1030℃, and the holding time is 1-2 hours. Then, quickly quench it in water to room temperature.

[0013] Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 50-60%.

[0014] Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and perform aging treatment under argon protection. The aging temperature is 460-540℃ and the aging time is 1-4h. Then cool it to room temperature by air cooling.

[0015] Step 7: After milling the surface of the alloy material that has undergone one aging process, perform a second rolling at room temperature, with a total rolling deformation of 80-90%.

[0016] Step 8: Place the alloy material that has been rolled twice at room temperature into a heat treatment furnace and perform aging treatment under argon protection. The aging temperature is 420-500℃ and the aging time is 0.5-4h. Then, cool it to room temperature by air cooling to obtain the copper alloy material.

[0017] Preferably, in step 4, the solution treatment temperature is 980-1000℃, and the time is 1-2 hours. Solvent treatment within this temperature range for 1-2 hours allows various elements to fully dissolve into the matrix in a relatively short time, while controlling the grain size to prevent abnormal growth. This helps reduce the size of subsequent aging precipitates, thereby improving mechanical properties.

[0018] Preferably, in step 6, the aging treatment temperature is 500-540℃, and the time is 3-4 hours. Pre-aging within this temperature range will precipitate some Fe2Ti and other precipitates. These precipitates will serve as heterogeneous nucleation sites for secondary aging, promoting the precipitation of precipitates during the secondary aging process. At the same time, the precipitates generated by pre-aging will interact with dislocations during the secondary cold rolling process, further improving the mechanical properties of the alloy.

[0019] Preferably, in step 8, the aging treatment temperature is 420-460℃, and the time is 2-3 hours. Secondary aging within this temperature range further promotes the precipitation of the precipitate phase. The fine, dispersed precipitate phase produced by secondary aging enhances the precipitation strengthening effect. Simultaneously, secondary aging further purifies the matrix, which can further improve the overall performance of the alloy.

[0020] Preferably, in step 1, the vacuum is evacuated to 10... -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas is used in Pa, and the melting is carried out under the protection of pure argon gas.

[0021] The beneficial effects of this invention are:

[0022] This invention incorporates various trace metallic elements into a copper-based alloy, ensuring a good balance between material strength and thermal conductivity. The added Fe element forms dispersed nanoscale Fe2Ti and FeTi phases with Ti, significantly enhancing the alloy's precipitation hardening effect. The added Ni element combines with Ti to form the NiTi phase, reducing Ti's solid solution in the copper matrix to some extent, thus contributing to improved alloy strength and thermal conductivity. Ni also hinders grain growth during heating, delays solid solution decomposition, and prevents microstructure inhomogeneity near grain boundaries due to over-aging reactions, further enhancing the alloy's precipitation hardening effect. The added Cr element forms a fine, dispersed Cr-rich phase during aging, increasing alloy strength; furthermore, Cr has very low solid solubility in copper, so adding trace amounts does not significantly reduce the alloy's thermal conductivity. The addition of Zr inhibits grain growth, effectively improving the alloy's heat resistance, and also forms Cu5Zr during aging, further strengthening the matrix. The added phosphorus (P) element can effectively deoxidize and purify the matrix, helping to improve the electrical conductivity of the alloy. Furthermore, P can combine with Fe to form second phases such as Fe2P, effectively improving the alloy's strength. Ca can effectively refine the grains, playing a role in grain refinement and strengthening, and can form Cu5Ca, which is beneficial for increasing strength. However, Ca itself has little effect on the electrical conductivity of Cu. Mg, Ag, and other elements can inhibit the growth of Cr, FeTi, and NiTi phases during aging, delaying over-aging of the alloy and ensuring a uniform and dispersed distribution of precipitated phases, significantly improving the alloy's resistance to stress relaxation. In addition, Ag can improve the mechanical properties of the alloy through solid solution strengthening without deteriorating thermal conductivity.

[0023] This invention achieves a copper-based alloy material with high strength, good thermal conductivity, and excellent heat resistance by optimizing alloy composition and deformation heat treatment processes. The staged aging method helps enhance the nucleation driving force of precipitates. Simultaneously, the precipitates from the secondary aging stage can use the precipitates from the primary aging stage as nucleation sites, further promoting the precipitation of precipitates. This enhanced precipitation strengthening effect further purifies the matrix and improves the alloy's strength and electrical conductivity.

[0024] The alloy material designed in this invention, after composition optimization and multi-stage aging and other deformation heat treatments, yields a copper alloy with excellent comprehensive mechanical properties, thermal conductivity, and elongation (hardness 213-246 HV, yield strength 583-667 MPa, ultimate tensile strength 638-758 MPa, electrical conductivity 60.7-68.5% IACS, and elongation 14-18%). Detailed Implementation

[0025] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] Example 1:

[0027] This embodiment provides a high-performance copper-based alloy material for lead frames, the composition of which is (by mass percentage): Fe: 0.6wt%, Cr: 0.3wt%, Ti: 0.3wt%, Ni: 0.15wt%, Zr: 0.15wt%, Mg: 0.2wt%, P: 0.1wt%, Ca: 0.15wt%, Ag: 0.2wt%, with the balance being Cu.

[0028] This embodiment provides a method for preparing a high-performance copper-based alloy material for lead frames, comprising the following steps:

[0029] Step 1: After carefully grinding and removing the oxide scale from each raw material, prepare the mixture according to the mass percentage of each component. Add the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag, and Cu to the crucible of the vacuum induction furnace, and evacuate to 10°C. -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas (Ar≥99.99%) was used to melt the alloy under pure argon protection. Then, an electric current was applied to raise the temperature to 350°C and hold for 3 minutes. The temperature was then raised to 800°C and held for 3 minutes. Finally, the temperature was raised to 1350°C and held for 5 minutes. The raw materials were melted uniformly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot.

[0030] During the smelting process, the use of intermediate alloys such as Cu-10Zr, Cu-20Mg, Cu-5Ca, and Cu-3P can effectively reduce the burn-off rate of low-melting-point elements such as Mg, Ca, Zr, and P. Furthermore, the three-stage heating smelting method can reduce element segregation and produce a more uniform microstructure, further minimizing element burn-off and contributing to improved mechanical properties and the acquisition of high-quality products with excellent overall performance.

[0031] Step 2: Mill the surface of the ingot to remove surface defects for subsequent processing; then place it in a heat treatment furnace for homogenization under argon protection at a temperature of 950℃ for 2 hours, and then cool it to room temperature with the furnace.

[0032] Step 3: Heat the homogenized ingot to 900℃, hold for 10 minutes, and then hot roll it. The total deformation during hot rolling is 60%. Then air cool it to room temperature.

[0033] Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment at a temperature of 1030℃ for 1 hour, and then quickly quench it in water to room temperature.

[0034] Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 60%.

[0035] Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and perform aging treatment under argon protection at a temperature of 500℃ for 4 hours. Then cool it to room temperature by air cooling.

[0036] Step 7: After milling the surface of the alloy material that has undergone one aging process, it is rolled a second time at room temperature, with a total rolling deformation of 90%.

[0037] Step 8: Place the alloy material that has been rolled twice at room temperature into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 460°C for 2 hours. Then cool it to room temperature by air cooling to obtain the copper alloy material.

[0038] The method employing room temperature rolling + aging + secondary rolling + secondary aging helps to enhance the nucleation driving force of precipitates. At the same time, the precipitates in the secondary aging can use the precipitates in the primary aging as nucleation sites, further promoting the precipitation of precipitates. While enhancing the precipitation strengthening effect, it also further purifies the matrix, which is beneficial to simultaneously improving the strength and electrical conductivity of the alloy.

[0039] The copper alloy material obtained in Example 1 has a hardness of 246 HV, a yield strength of 667 MPa, a tensile strength of 758 MPa, an electrical conductivity of 60.7% IACS, and an elongation of 14%.

[0040] Example 2:

[0041] This embodiment provides a high-performance copper-based alloy material for lead frames, with the following composition (by mass percentage): Fe: 0.4wt%, Cr: 0.2wt%, Ti: 0.2wt%, Ni: 0.1wt%, Zr: 0.1wt%, Mg: 0.1wt%, P: 0.05wt%, Ca: 0.1wt%, Ag: 0.1wt%, and the balance being Cu.

[0042] This embodiment provides a method for preparing a high-performance copper-based alloy material for lead frames, comprising the following steps:

[0043] Step 1: After carefully grinding and removing the oxide scale from each raw material, prepare the mixture according to the mass percentage of each component. Add the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag, and Cu to the crucible of the vacuum induction furnace, and evacuate to 10°C. -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas (Ar≥99.99%) was used to melt the alloy under pure argon protection. Then, an electric current was applied to raise the temperature to 350°C and hold for 3 minutes. The temperature was then raised to 800°C and held for 3 minutes. Finally, the temperature was raised to 1400°C and held for 10 minutes. The raw materials were melted uniformly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot.

[0044] Step 2: Mill the surface of the ingot, then place it in a heat treatment furnace for homogenization under argon protection. The homogenization temperature is 920℃ and the time is controlled for 2 hours. Then, cool it to room temperature with the furnace.

[0045] Step 3: Heat the homogenized ingot to 900℃, hold for 10 minutes and then hot roll it. The total deformation during hot rolling is 50%. Then air cool it to room temperature.

[0046] Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment at a temperature of 980℃ for 1 hour, and then quickly quench it in water to room temperature.

[0047] Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 60%.

[0048] Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and perform aging treatment under argon protection at a temperature of 500℃ for 4 hours. Then cool it to room temperature by air cooling.

[0049] Step 7: After milling the surface of the alloy material after one aging, perform a second rolling at room temperature, with a total rolling deformation of 80%.

[0050] Step 8: Place the alloy material that has been rolled twice at room temperature into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 460°C for 1 hour. Then cool it to room temperature by air cooling to obtain the copper alloy material.

[0051] The copper alloy material obtained in Example 2 has a hardness of 213HV, a yield strength of 583 MPa, a tensile strength of 638 MPa, an electrical conductivity of 68.5% IACS, and an elongation of 18%.

[0052] Example 3:

[0053] This embodiment provides a high-performance copper-based alloy material for lead frames, with the following composition (by mass percentage): Fe: 0.5wt%, Cr: 0.2wt%, Ti: 0.3wt%, Ni: 0.1wt%, Zr: 0.15wt%, Mg: 0.1wt%, P: 0.05wt%, Ca: 0.15wt%, Ag: 0.2wt%, and the balance being Cu.

[0054] This embodiment provides a method for preparing a high-performance copper-based alloy material for lead frames, comprising the following steps:

[0055] Step 1: After carefully grinding and removing the oxide scale from each raw material, prepare the mixture according to the mass percentage of each component. Add the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag, and Cu to the crucible of the vacuum induction furnace, and evacuate to 10°C. -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas (Ar≥99.99%) was used to melt the alloy under pure argon protection. Then, an electric current was applied to raise the temperature to 350°C and hold for 3 minutes. The temperature was then raised to 800°C and held for 3 minutes. Finally, the temperature was raised to 1350°C and held for 10 minutes. The raw materials were melted uniformly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot.

[0056] Step 2: Mill the surface of the ingot to remove surface defects for subsequent processing; then place it in a heat treatment furnace for homogenization under argon protection at a temperature of 920℃ for 3 hours, and then cool it to room temperature with the furnace.

[0057] Step 3: Heat the homogenized ingot to 850℃, hold for 15 minutes and then hot roll it. The total deformation during hot rolling is 60%. Then air cool it to room temperature.

[0058] Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment at a temperature of 980℃ for 1 hour, and then quickly quench it in water to room temperature.

[0059] Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 50%.

[0060] Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 540℃ for 2 hours. Then cool it to room temperature by air cooling.

[0061] Step 7: After milling the surface of the alloy material after one aging, perform a second rolling at room temperature, with a total rolling deformation of 80%.

[0062] Step 8: Place the alloy material that has been rolled twice at room temperature into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 420°C for 2 hours. Then cool it to room temperature by air cooling to obtain the copper alloy material.

[0063] The copper alloy material obtained in Example 3 has a hardness of 223 HV, a yield strength of 614 MPa, a tensile strength of 669 MPa, an electrical conductivity of 63.5% IACS, and an elongation of 16%.

[0064] Example 4:

[0065] This embodiment provides a high-performance copper-based alloy material for lead frames, with the following composition: Fe: 0.4wt%, Cr: 0.3wt%, Ti: 0.2wt%, Ni: 0.1wt%, Zr: 0.15wt%, Mg: 0.15wt%, P: 0.1wt%, Ca: 0.15wt%, Ag: 0.1wt%, and the balance being Cu.

[0066] This embodiment describes a method for preparing a high-performance copper-based alloy material for a lead frame, comprising the following steps:

[0067] Step 1: After carefully grinding and removing the oxide scale from each raw material, prepare the mixture according to the mass percentage of each component. Add the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag, and Cu to the crucible of the vacuum induction furnace, and evacuate to 10°C. -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas (Ar≥99.99%) was used to melt the alloy under pure argon protection. Then, an electric current was applied to raise the temperature to 350°C and hold for 3 minutes. The temperature was then raised to 800°C and held for 3 minutes. Finally, the temperature was raised to 1400°C and held for 10 minutes. The raw materials were melted uniformly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot.

[0068] Step 2: Mill the surface of the ingot, then place it in a heat treatment furnace for homogenization under argon protection. The homogenization temperature is 950℃ and the time is controlled for 3 hours. Then, cool it to room temperature with the furnace.

[0069] Step 3: Heat the homogenized ingot to 850℃, hold for 15 minutes, and then hot roll it. The total deformation during hot rolling is 50%. Then air cool it to room temperature.

[0070] Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment at a temperature of 1030℃ for 1 hour, and then quickly quench it in water to room temperature.

[0071] Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 50%.

[0072] Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 540℃ for 3 hours. Then cool it to room temperature by air cooling.

[0073] Step 7: After milling the surface of the alloy material that has undergone one aging process, it is rolled a second time at room temperature, with a total rolling deformation of 90%.

[0074] Step 8: Place the alloy material that has been rolled twice at room temperature into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 460°C for 1 hour. Then cool it to room temperature by air cooling to obtain the copper alloy material.

[0075] The copper alloy material obtained in Example 4 has a hardness of 237 HV, a yield strength of 639 MPa, a tensile strength of 712 MPa, an electrical conductivity of 62.7% IACS, and an elongation of 15.5%.

[0076] Example 5:

[0077] The difference between this embodiment and Example 1 is that the proportions of each component are different: the component contents are: Fe: 0.45wt%, Cr: 0.2wt%, Ti: 0.2wt%, Ni: 0.1wt%, Zr: 0.1wt%, Mg: 0.2wt%, P: 0.06wt%, Ca: 0.12wt%, Ag: 0.1wt%, and the balance is Cu.

[0078] The copper alloy material obtained in Example 5 has a hardness of 227 HV, a yield strength of 624 MPa, a tensile strength of 716 MPa, an electrical conductivity of 62.2% IACS, and an elongation of 15.1%.

[0079] Example 6:

[0080] The difference between this embodiment and Example 4 is that the proportions of each component are different: the component contents are: Fe: 0.5wt%, Cr: 0.3wt%, Ti: 0.25wt%, Ni: 0.1wt%, Zr: 0.1wt%, Mg: 0.1wt%, P: 0.05wt%, Ca: 0.15wt%, Ag: 0.2wt%, and the balance is Cu.

[0081] The copper alloy material obtained in Example 6 has a hardness of 241 HV, a yield strength of 644 MPa, a tensile strength of 728 MPa, an electrical conductivity of 61.9% IACS, and an elongation of 14.7%.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A high-performance copper-based alloy material for lead frames, characterized in that: Composed of the following components by mass percentage Composition: Fe: 0.4-0.6 wt%, Cr: 0.2-0.3 wt%, Ti: 0.2-0.3 wt%, Ni: 0.1-0.15 wt%, Zr: 0.1-0.15 wt%, Mg: 0.1-0.2 wt%, P: 0.05-0.1 wt%, Ca: 0.1-0.15 wt%, Ag: 0.1-0.2 wt%, balance Cu; The method for preparing the high-performance copper-based alloy material for the lead frame includes the following steps: Step 1: After pretreatment, the raw materials are prepared according to the mass percentage. Then, the prepared Fe, Ti, Ni, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-20Mg master alloy, Cu-5Ca master alloy, Cu-3P master alloy, Ag and Cu are added to the crucible of the vacuum induction furnace. After evacuation, argon gas is introduced into the furnace and smelting is carried out under the protection of pure argon gas. Then, current is applied to raise the temperature to 300-350℃ and hold for 2-3 minutes. Then, the temperature is raised to 780-800℃ and held for 2-3 minutes. Then, the temperature is raised to 1350-1400℃ and held for 5-10 minutes. The raw materials are melted evenly by electromagnetic stirring and then cast into a mold to obtain an alloy ingot. Step 2: Mill the surface of the ingot, then place it in a heat treatment furnace for homogenization under argon protection. The homogenization temperature is 920℃-950℃ and the time is controlled at 2-3 hours. Then cool it to room temperature with the furnace. Step 3: Heat the homogenized ingot to 850-900℃, hold for 10-15 minutes and then hot roll it. The total deformation during hot rolling is 50-60%. Then air cool it to room temperature. Step 4: After removing the surface oxide scale from the hot-rolled alloy material, place it in a heat treatment furnace for solution treatment. The solution treatment temperature is 980-1030℃, and the holding time is 1-2 hours. Then, quickly quench it in water to room temperature. Step 5: After milling the solution-treated alloy material, roll it at room temperature with a total deformation of 50-60%. Step 6: Place the room temperature rolled alloy material into a heat treatment furnace and age it under argon protection at a temperature of 460-540℃ for 1-4 hours. Then cool it to room temperature by air cooling. Step 7: After milling the surface of the alloy material that has undergone one aging process, perform a second rolling at room temperature, with a total rolling deformation of 80-90%; Step 8: Place the alloy material after room temperature secondary rolling into a heat treatment furnace and perform aging treatment under argon protection at an aging temperature of 420-500℃ for 0.5-4h. Then cool it to room temperature by air cooling to obtain the copper-based alloy material with an ultimate tensile strength of 638-758 MPa, an electrical conductivity of 60.7-68.5% IACS, and an elongation of 14-18%.

2. The high-performance copper-based alloy material for lead frames according to claim 1, characterized in that: Composed of the following components by mass percentage Composition: Fe: 0.6wt%, Cr: 0.3wt%, Ti: 0.3wt%, Ni: 0.15wt%, Zr: 0.15wt%, Mg: 0.2wt%, P: 0.1wt%, Ca: 0.1wt%, Ag: 0.2wt%, balance Cu.

3. The high-performance copper-based alloy material for lead frames according to claim 1, characterized in that: Composed of the following components by mass percentage Composition: Fe: 0.4wt%, Cr: 0.2wt%, Ti: 0.2wt%, Ni: 0.1wt%, Zr: 0.1wt%, Mg: 0.1wt%, P: 0.05wt%, Ca: 0.1wt%, Ag: 0.1wt%, balance Cu.

4. The method for preparing a high-performance copper-based alloy material for lead frames according to claim 1, characterized in that: In step 4, the solution treatment temperature is 980-1000℃ and the time is 1-2 hours.

5. A method for preparing a high-performance copper-based alloy material for a lead frame according to claim 1, characterized in that: In step 6, the aging treatment temperature is 500-540℃ and the time is 3-4 hours.

6. The method for preparing a high-performance copper-based alloy material for lead frames according to claim 1, characterized in that: In step 8, the aging treatment temperature is 420-460℃ and the time is 2-3 hours.

7. The method for preparing a high-performance copper-based alloy material for lead frames according to claim 1, characterized in that: In step 1, the vacuum is evacuated to 10. -3 Below pa, then 1.1 × 10⁻⁶ Pa is introduced into the furnace. 5 Argon gas is used in Pa, and the melting is carried out under the protection of pure argon gas.