A method for preparing copper-nickel-silicon-cobalt-magnesium alloy and copper-nickel-silicon-cobalt-magnesium alloy

Abstract

The present invention relates to the technical field of alloy preparation, and discloses a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy and a copper-nickel-silicon-cobalt-magnesium alloy. The addition of Co element can promote the precipitation of (Ni, Co) in the copper alloy. 2 Si phase, adding Mg element can promote the complete precipitation of precipitated phase in copper alloy. Therefore, in order to further improve the performance of Cu-Ni-Si alloy used for high-end integrated circuit lead frame, this study added Co and Mg elements on the basis of Cu-Ni-Si ternary component, and promoted the full precipitation of (Ni, Co)2Si phase by changing the Mg element content. At the same time, by controlling the Mg element content, while ensuring that the alloy has a certain conductivity, it can ensure that the alloy as a whole has certain mechanical properties.

Description

Technical Field

[0001] The present invention relates to the field of alloy preparation, and in particular to a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy and the copper-nickel-silicon-cobalt-magnesium alloy. Background Art

[0002] Cu-Ni-Si series alloys have comprehensive properties such as high strength, moderate electrical and thermal conductivity, and good resistance to high temperature softening.

[0003] In the prior art, to improve alloy strength, Cu-Ni-Si alloys are typically precipitation strengthened, typically using a solution treatment-rolling-aging process. Solution treatment dissolves Ni, Si, and other alloys into a copper matrix. During subsequent rolling and aging treatments, a large number of fine, uniform Ni2Si phase particles precipitate, achieving precipitation strengthening. The Si content in the copper matrix significantly impacts the electrical conductivity of the copper alloy. As Ni2Si precipitates, the alloy's electrical conductivity gradually increases.

[0004] However, the Cu-Ni-Si series alloys still have the defects of relatively poor mechanical properties and electrical conductivity. Summary of the Invention

[0005] In view of this, the present invention provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy and a copper-nickel-silicon-cobalt-magnesium alloy to solve the problem in the prior art that it is impossible to take into account both electrical conductivity and mechanical properties at the same time.

[0006] In a first aspect, the present invention provides a nickel-silicon-cobalt-magnesium alloy, wherein, calculated by mass fraction of the alloy components, Ni is 1.80%, Si is 0.62%, Co is 1.1%, Mg is 0.12%-0.24%, and the balance is copper.

[0007] Beneficial effects: The addition of Co element can promote the precipitation of (Ni, Co)2Si phase in copper alloy, and the addition of Mg element can promote the complete precipitation of the precipitated phase in copper alloy. Therefore, in order to further improve the performance of Cu-Ni-Si alloy used for high-end integrated circuit lead frames, this study added Co and Mg elements on the basis of Cu-Ni-Si ternary components, and promoted the full precipitation of (Ni, Co)2Si phase by changing the Mg element content. At the same time, by controlling the Mg element content, while ensuring that the alloy has a certain conductivity, it can ensure that the alloy as a whole has certain mechanical properties.

[0008] In an optional embodiment,

[0009] On the other hand, the present invention provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used to prepare the nickel-silicon-cobalt-magnesium alloy provided by the present invention, comprising the following steps: placing a high-purity copper raw material, a nickel raw material, a silicon raw material and a cobalt raw material into a smelting device for melting; evacuating the smelting device to reduce the air pressure inside the smelting device to below 20 Pa; introducing an inert gas into the smelting device to increase the air pressure inside the smelting device to between 0.04 and 0.05 MPa; introducing a magnesium raw material into the smelting device, and starting the smelting device to melt the magnesium raw material; allowing the metal melt obtained after smelting to stand, and taking out the alloy ingot after cooling to room temperature; and casting the obtained alloy ingot. A solution treatment operation is performed, wherein the solution treatment temperature is 800° C.-900° C. and the solution treatment time is 5 hours; a rolling operation is performed on the alloy ingot after the solution treatment, comprising: a rough rolling step: the rolling temperature is room temperature, the single pass is 20%, the roller speed is 30 rpm, and the rough rolling reduction is 90%; a finishing rolling step: the rolling temperature is room temperature, the single pass is 10%, the roller speed is 20 rpm, and the finishing rolling reduction is 90%; the total rolling reduction is 99%; after the rolling operation step, the method further comprises: aging treatment of the rolled alloy at 300-400° C. for 10-40 minutes, and air cooling to room temperature after aging.

[0010] Furthermore, the vacuum induction melting furnace is provided with a copper tube, and the magnesium raw material is introduced into the vacuum induction melting furnace through the copper tube.

[0011] Furthermore, before the rolling operation step, the alloy ingot is cleaned, including: polishing with sandpaper and cleaning with acetone and alcohol.

[0012] Another aspect of the present invention provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used to prepare the nickel-silicon-cobalt-magnesium alloy provided by the present invention, comprising the following steps:

[0013] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting; evacuating the smelting device to reduce the internal pressure of the smelting device to below 20Pa; introducing inert gas into the smelting device to increase the internal pressure of the smelting device to between 0.04-0.05Mpa; introducing magnesium raw materials into the smelting device and starting the smelting device to melt the magnesium raw materials; allowing the metal melt obtained after smelting to stand and cool to room temperature before taking out the alloy ingot; performing a solid solution operation on the obtained alloy ingot, wherein the solid solution temperature is 800°C-900°C and the solid solution time is 5 hours; The alloy ingot after the solution treatment is subjected to a rolling operation, including: keeping the alloy sample at 760°C-800°C for 0.5h; hot rolling on a two-roll mill, rolling conditions: single pass 30%, roll speed 30 rpm, hot rolling reduction of 50-55%; after the alloy sample is air-cooled to room temperature, rough rolling is performed on a two-roll mill, rolling conditions: room temperature, single pass 20%, roll speed 30 rpm, rough rolling reduction of 80-85%; aging treatment is performed on the rolled alloy at 430°C for 0.5h-4h, and air cooling is performed to room temperature after aging.

[0014] Furthermore, the vacuum induction melting furnace is provided with a copper tube, and the magnesium raw material is introduced into the vacuum induction melting furnace through the copper tube.

[0015] Furthermore, before the rolling operation step, the alloy ingot is cleaned, including: polishing with sandpaper and cleaning with acetone and alcohol. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a partial process flow chart of one of the preparation methods provided by the present invention;

[0018] Figure 2 This is a phase diagram of the nickel-silicon-cobalt-magnesium alloy provided by the present invention;

[0019] Figure 3 is the conductivity corresponding to the first group of samples provided by the present invention;

[0020] Figure 4 is the tensile strength corresponding to the first group of samples provided by the present invention;

[0021] Figure 5 is the conductivity corresponding to the second group of samples provided by the present invention;

[0022] Figure 6 is the tensile strength corresponding to the second group of samples provided by the present invention;

[0023] Figure 7 is the conductivity corresponding to the third group of samples provided by the present invention;

[0024] Figure 8 is the tensile strength corresponding to the third group of samples provided by the present invention;

[0025] Figure 9 is the conductivity corresponding to the fourth group of samples provided by the present invention;

[0026] Figure 10 is the tensile strength corresponding to the fourth group of samples provided by the present invention;

[0027] Figure 11 is the electrical conductivity corresponding to the fifth group of samples provided by the present invention;

[0028] Figure 12 is the tensile strength corresponding to the fifth group of samples provided by the present invention;

[0029] Figure 13 is the conductivity corresponding to the sixth group of samples provided by the present invention;

[0030] Figure 14 is the tensile strength corresponding to the sixth group of samples provided by the present invention;

[0031] Figure 15 is the electrical conductivity corresponding to the seventh group of samples provided by the present invention;

[0032] Figure 16 is the tensile strength corresponding to the seventh group of samples provided by the present invention;

[0033] Figure 17 It is a schematic diagram of the strength test of the sample in the present invention. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] In order to solve the problems existing in the above-mentioned related technologies, according to a first aspect of the present invention, a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy is provided, comprising the following steps: placing a high-purity copper raw material, a nickel raw material, a silicon raw material and a cobalt raw material into a smelting device for melting; evacuating the smelting device to reduce the air pressure inside the smelting device to below 20 Pa; introducing an inert gas into the smelting device to increase the air pressure inside the smelting device to between 0.04 and 0.05 MPa; introducing a magnesium raw material into the smelting device, and starting the smelting device to melt the magnesium raw material; and allowing the metal melt obtained after smelting to stand and taking out the alloy ingot after cooling to room temperature.

[0036] In this embodiment, combined with Figures 1-17 The reaction mechanism involved is as follows:

[0037] Adding the Co element can promote the precipitation of the (Ni, Co)2Si phase in the copper alloy, and adding the Mg element can promote the complete precipitation of the precipitated phase in the copper alloy. Therefore, in order to further improve the performance of the Cu-Ni-Si alloy for high-end integrated circuit lead frames; in this embodiment, it can be seen from the accompanying drawings that when the magnesium element is added, the electrical conductivity of the alloy is almost unchanged, but its tensile strength is significantly increased. That is, by introducing the magnesium element, the complete precipitation of the precipitated phase in the copper alloy can be promoted. In addition, the electrical conductivity can be controlled while the mechanical properties of the alloy are additionally improved, thereby controlling the alloy to have a relatively good overall performance.

[0038] On the basis of Cu-Ni-Si ternary components, Co and Mg elements were added, and by changing the Mg content, such as Figure 2 As shown, the full precipitation of the (Ni, Co)2Si phase is promoted and the Si content in the matrix is reduced to obtain a Cu-Ni-Si-Co-Mg alloy with good mechanical properties and electrical conductivity. A method for preparing a high-strength and high-conductivity copper-nickel-silicon-cobalt-magnesium alloy is also provided, which has a short process flow, simple preparation technology, and low cost.

[0039] The present invention is further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in the present invention.

[0040] Example 1

[0041] This embodiment provides a nickel-silicon-cobalt-magnesium alloy, wherein, based on the mass fraction of the alloy components, Ni is 1.80%, Si is 0.62%, Co is 1.1%, Mg is 0.12%-0.24%, and the balance is copper.

[0042] Example 2:

[0043] This embodiment provides a method for preparing a nickel-silicon-cobalt-magnesium alloy, comprising the following steps:

[0044] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0045] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.12%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0046] Perform vacuum operation on the smelting equipment to reduce the air pressure inside the smelting equipment to below 20Pa;

[0047] In this embodiment, the smelting equipment is not limited, as long as it can melt the alloy. As an implementation, a vacuum induction melting furnace is used for the smelting operation. Specifically, prepared high-purity copper, nickel, silicon, and cobalt granules are added to a graphite crucible in the vacuum induction melting furnace. In this embodiment, a copper tube is installed in the vacuum induction melting furnace to facilitate the addition of magnesium. The magnesium raw material is passed into the vacuum induction melting furnace through the copper tube.

[0048] Furthermore, an inert gas is introduced into the smelting equipment to increase the pressure inside the smelting equipment to between 0.04-0.05 MPa;

[0049] Through the above-mentioned operating steps, an inert gas environment can be formed inside the smelting equipment, thereby preventing the magnesium element to be introduced subsequently from being oxidized.

[0050] Furthermore, magnesium raw materials are introduced into the smelting equipment, and the smelting equipment is started to melt the magnesium raw materials; the metal melt obtained after smelting is allowed to stand, and the alloy ingot is taken out after cooling to room temperature.

[0051] Specifically, a vacuum induction melting furnace is equipped with a secondary copper tube. High-purity magnesium granules are first sealed into the tube. The furnace is closed and the air is evacuated to 13 Pa, creating a near-vacuum environment. Argon is then introduced to a pressure of 0.04-0.05 MPa, creating an inert atmosphere. The metal granules in the crucible are completely melted by induction heating. The mixture is then allowed to stand for 2-3 minutes. High-purity magnesium granules are then added to the molten metal through the secondary copper tube. The mixture is then allowed to stand for another 3-5 minutes. Finally, the molten alloy is poured into a mold, cooled to room temperature, and the ingot is removed.

[0052] Adding Co promotes the precipitation of (Ni, Co)2Si phases in copper alloys, while adding Mg promotes the complete precipitation of the precipitated phases in copper alloys. Therefore, in order to further enhance the performance of the Cu-Ni-Si alloy used in high-end integrated circuit lead frames, in this embodiment, the addition of Mg results in little change in the electrical conductivity of the alloy, but a significant increase in its tensile strength. This means that the introduction of Mg not only promotes the complete precipitation of the precipitated phases in the copper alloy, but also controls the electrical conductivity while further enhancing the mechanical properties of the alloy, thereby controlling the alloy to have relatively good overall performance.

[0053] Furthermore, the copper-nickel-silicon-cobalt-magnesium alloy preparation method provided in this embodiment also includes: performing a solid solution operation on the obtained alloy ingot, wherein the solid solution temperature is 800°C-900°C and the solid solution time is 5 hours.

[0054] Specifically, the alloy ingot was cut into blocks by wire cutting, and then solution treated. After being kept at 850°C for 5 hours, it was water-cooled to room temperature, polished with sandpaper, and then surface impurities were cleaned with acetone and alcohol.

[0055] Furthermore, the copper-nickel-silicon-cobalt-magnesium alloy preparation method provided in this embodiment further includes: rolling operation on the alloy ingot after solid solution operation treatment, including: rough rolling step: rolling temperature is room temperature, single pass 20%, roll speed is 30 rpm, and rough rolling reduction is 90%; finishing rolling step: rolling temperature is room temperature, single pass 10%, roll speed is 20 rpm, and finishing rolling reduction is 90%; the total rolling reduction is 99%.

[0056] In this embodiment, before the rolling operation step, the alloy ingot is also cleaned, including: polishing with sandpaper and cleaning with acetone and alcohol.

[0057] Furthermore, the copper-nickel-silicon-cobalt-magnesium alloy preparation method provided in this embodiment further includes, after the rolling operation step: aging the rolled alloy at 300°C for 20 minutes, and air-cooling to room temperature after aging.

[0058] Strip samples were obtained by wire cutting, and their microstructure, conductivity and mechanical properties were analyzed and tested.

[0059] Example 3:

[0060] This embodiment is made on the basis of embodiment 2, and the main difference is that the content of magnesium element is different.

[0061] Prepare raw materials according to the alloy composition: Ni (1.80%), Si (0.62%), Co (1.1%), Mg (0.24%), and the balance copper (99.99% purity). High-purity copper, nickel, silicon, and cobalt granules are placed in a graphite crucible in a vacuum induction melting furnace. High-purity magnesium granules are sealed in a secondary copper tube. The furnace is closed and air is evacuated to 13 Pa (13 Pa). Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal granules in the crucible are completely melted by induction heating. The mixture is allowed to stand for 2-3 minutes. High-purity magnesium granules are then added to the molten metal through the secondary copper tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the molten alloy is poured into a mold, cooled to room temperature, and the ingot is removed. The alloy ingots were cut into blocks by wire cutting and then solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough-rolled on a two-roll mill at room temperature, with a 20% pass and a roll speed of 30 rpm, for a roughing reduction of 90%. The samples were then finish-rolled on a four-roll mill at room temperature, with a 10% pass and a roll speed of 20 rpm, for a finishing reduction of 90%, resulting in a total rolling reduction of 99%. The cold-rolled alloy samples were aged at 300°C for 40 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0062] Comparative Example 1:

[0063] Prepare raw materials according to the alloy component mass fraction of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0064] High-purity copper, nickel, silicon, and cobalt granules are placed in a graphite crucible in a vacuum induction melting furnace. High-purity magnesium granules are sealed in a secondary copper feeding tube. The furnace is closed and the air is evacuated to 13 Pa. Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal granules in the crucible are completely melted by induction heating. The mixture is allowed to stand for 2-3 minutes. High-purity magnesium granules are then added to the molten metal via the secondary copper feeding tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the alloy melt is poured into a mold and the ingot is removed after cooling to room temperature. The alloy ingot is cut into blocks using wire cutting and then solution treated. After being held at 850°C for 5 hours, it is cooled to room temperature with water and then water cooled to room temperature. The ingot is then sanded with sandpaper and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough rolled on a two-roll mill at room temperature, with a 20% reduction per pass and a roll speed of 30 rpm, resulting in a roughing reduction of 90%. The samples were then finish rolled on a four-roll mill at room temperature, with a 10% reduction per pass and a roll speed of 20 rpm, resulting in a total finishing reduction of 90%. The cold-rolled alloy samples were aged at 300°C for 10 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0065] The samples obtained in Example 1, Example 2 and Comparative Example 1 were set as the first sample group and tested. The test results are as follows:

[0066] Table 1 Mechanical properties test results of the first group of samples

[0067] Validity Time 0% Mg 0.12% Mg 0.24% Mg min MPa MPa MPa 0 505 648 692.2 10 536.1 683.3 695.5 20 488.8 685.1 663 30 506.1 675.01 669.6 40 493.9 664.2 574.1

[0068] Table 2 Mechanical property increments of the first group of specimens

[0069] Validity Time 0% Mg 0.12% Mg 0.24% Mg min 0 0 28.32％ 37.07％ 10 0 27.46％ 29.73％ 20 0 40.16％ 35.64％ 30 0 33.37％ 32.31％ 40 0 34.48％ 16.24％ average value 32.76％ 30.2％

[0070] Table 3 Test results of conductivity of the first group of samples

[0071] Validity Time 0% Mg 0.12% Mg 0.24% Mg min %IACS %IACS %IACS 0 39.90782 38.15191 36.46133 10 43.37981 40.79989 38.91011 20 43.37359 42.17397 39.52091 30 42.02735 41.27406 39.42829 40 44.026 41.77813 37.74119

[0072] Table 4 Increment of conductivity of the first group of samples

[0073] Validity Time 0% Mg 0.12% Mg 0.24% Mg min 0 0 -4.40％ -8.64％ 10 0 -5.95％ -10.30％ 20 0 -2.77％ -8.88％ 30 0 -1.79％ -6.18％ 40 0 -5.11％ -14.28％ average value -4％ -9.66％

[0074] Combining the contents in Tables 1 to 4, it can be seen that in the first group of samples, when the magnesium content increases to 0.12%, its mechanical properties increase by 32.76%, but its electrical conductivity only changes by 4%.

[0075] In the first group of samples, when the magnesium content increased to 0.24%, its mechanical properties increased by 30.2%, but its electrical conductivity only changed by 9.66%.

[0076] Example 4:

[0077] This example is based on Example 2. Raw materials are prepared according to the alloy composition mass fractions of 1.80% Ni, 0.62% Si, 1.1% Co, and 0.12% Mg, with the balance being copper. The purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%. The prepared high-purity copper, nickel, silicon, and cobalt particles are added to a graphite crucible in a vacuum induction melting furnace. High-purity magnesium particles are sealed in a secondary copper feeding tube. The furnace is closed and air is evacuated to 13 Pa. Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal particles in the crucible are completely melted by induction heating and allowed to stand for 2-3 minutes. The high-purity magnesium particles are then added to the molten metal through the secondary copper feeding tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the alloy melt is poured into a mold, cooled to room temperature, and the ingot is removed. The alloy ingots were cut into blocks by wire cutting and subsequently solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough rolled on a two-roll mill under the following conditions: room temperature, 20% per pass, 30 rpm, and a roughing reduction of 90%. The samples were then finish rolled on a four-roll mill under the following conditions: room temperature, 10% per pass, 20 rpm, and a finishing reduction of 90%. The total rolling reduction was 99%.

[0078] The main difference lies in the aging temperature. The cold-rolled alloy samples were aged at 350°C for 20 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, conductivity, and mechanical properties.

[0079] Example 5:

[0080] This embodiment is made on the basis of embodiment 2, and the main differences are: different magnesium content and different aging treatment issues.

[0081] Prepare raw materials according to the alloy composition: Ni (1.80%), Si (0.62%), Co (1.1%), Mg (0.24%), and the balance copper (99.99% purity). High-purity copper, nickel, silicon, and cobalt granules are placed in a graphite crucible in a vacuum induction melting furnace. High-purity magnesium granules are sealed in a secondary copper tube. The furnace is closed and air is evacuated to 13 Pa (13 Pa). Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal granules in the crucible are completely melted by induction heating. The mixture is allowed to stand for 2-3 minutes. High-purity magnesium granules are then added to the molten metal through the secondary copper tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the molten alloy is poured into a mold, cooled to room temperature, and the ingot is removed. The alloy ingots were cut into blocks by wire cutting and then solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough-rolled on a two-roll mill at room temperature, with a 20% pass and a roll speed of 30 rpm, for a roughing reduction of 90%. The samples were then finish-rolled on a four-roll mill at room temperature, with a 10% pass and a roll speed of 20 rpm, for a finishing reduction of 90%, resulting in a total rolling reduction of 99%. The cold-rolled alloy samples were aged at 350°C for 40 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0082] Comparative Example 2:

[0083] Comparative Example 2 is based on Comparative Example 1. Raw materials were prepared according to the alloy composition mass fractions of 1.80% Ni, 0.62% Si, 1.1% Co, and 0% Mg, with the balance being copper. The Cu purity was ≥99.99%, the Ni purity was ≥99.99%, the Si purity was ≥99.99%, and the Co purity was ≥99.99%. The prepared high-purity copper, nickel, silicon, and cobalt particles were added to a graphite crucible in a vacuum induction melting furnace. High-purity magnesium particles were sealed in a secondary copper feeding tube. The furnace was closed and air was evacuated to 13 Pa. Argon was then introduced to a pressure of 0.04-0.05 MPa. The metal particles in the crucible were completely melted by induction heating and allowed to stand for 2-3 minutes. The high-purity magnesium particles were then added to the molten metal through the secondary copper feeding tube. The mixture was allowed to stand for another 3-5 minutes. Finally, the alloy melt was poured into a mold, cooled to room temperature, and the ingot was removed. The alloy ingots were cut into blocks by wire cutting and then solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough-rolled on a two-roll mill at room temperature, with a 20% pass and a roll speed of 30 rpm, for a roughing reduction of 90%. The samples were then finish-rolled on a four-roll mill at room temperature, with a 10% pass and a roll speed of 20 rpm, for a finishing reduction of 90%, resulting in a total rolling reduction of 99%. The cold-rolled alloy samples were aged at 350°C for 10 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0084] The samples obtained in Example 4, Example 5 and Reference Document 2 were set as the second sample group, and the test results obtained were as follows:

[0085] Table 5 Mechanical properties test results of the second group of samples

[0086]

[0087]

[0088] Table 6 Mechanical property increment of the second group of specimens

[0089] Validity Time 0% Mg 0.12% Mg 0.24% Mg min MPa MPa MPa 0 0 28.32％ 37.07％ 10 0 40.36％ 30.55％ 20 0 48.06％ 48.79％ 30 0 33.93％ 44.36％ 40 0 48.88％ 37.50％ average value 39.91％ 39.65％

[0090] Table 7 Test results of the second group of conductive properties of samples

[0091] Validity Time 0% Mg 0.12% Mg 0.24% Mg min %IACS %IACS %IACS 0 39.90782 38.15191 36.46133 10 45.65904 43.93641 41.68083 20 49.42942 44.51266 43.3511 30 50.11967 44.56421 43.44804 40 50.92238 45.07294 43.80021

[0092] Table 8 Conductivity increment of the second group of samples

[0093] Validity Time 0% Mg 0.12% Mg 0.24% Mg min 0 0 -4.40％ -8.64％ 10 0 -3.77％ -8.71％ 20 0 -9.95％ -12.30％ 30 0 -11.08％ -13.31％ 40 0 -11.49％ -13.99％ average value -8.4％ -11.39％

[0094] Combining the contents in Tables 5 to 8, it can be seen that in the second group of samples, when the magnesium content increases to 0.12%, its mechanical properties increase by 39.91%, but its electrical conductivity only changes by 8.4%.

[0095] In the second group of samples, when the magnesium content increased to 0.24%, its mechanical properties increased by 39.65%, but its electrical conductivity only changed by 11.39%.

[0096] Example 6:

[0097] This example is based on Example 2. Raw materials are prepared according to the alloy composition mass fractions of 1.80% Ni, 0.62% Si, 1.1% Co, and 0.12% Mg, with the balance being copper. The purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%. The prepared high-purity copper, nickel, silicon, and cobalt particles are added to a graphite crucible in a vacuum induction melting furnace. High-purity magnesium particles are sealed in a secondary copper feeding tube. The furnace is closed and air is evacuated to 13 Pa. Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal particles in the crucible are completely melted by induction heating and allowed to stand for 2-3 minutes. The high-purity magnesium particles are then added to the molten metal through the secondary copper feeding tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the alloy melt is poured into a mold, cooled to room temperature, and the ingot is removed. The alloy ingots were cut into blocks by wire cutting and subsequently solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough rolled on a two-roll mill under the following conditions: room temperature, 20% per pass, 30 rpm, and a roughing reduction of 90%. The samples were then finish rolled on a four-roll mill under the following conditions: room temperature, 10% per pass, 20 rpm, and a finishing reduction of 90%. The total rolling reduction was 99%.

[0098] The main difference lies in the aging temperature. The cold-rolled alloy samples were aged at 400°C for 20 minutes, followed by air cooling to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, conductivity, and mechanical properties.

[0099] Example 7:

[0100] This embodiment is made on the basis of embodiment 2, and the main differences are: different magnesium content and different aging treatment issues.

[0101] Prepare raw materials according to the alloy composition: Ni (1.80%), Si (0.62%), Co (1.1%), Mg (0.24%), and the balance copper (99.99% purity). High-purity copper, nickel, silicon, and cobalt granules are placed in a graphite crucible in a vacuum induction melting furnace. High-purity magnesium granules are sealed in a secondary copper tube. The furnace is closed and air is evacuated to 13 Pa (13 Pa). Argon is then introduced to a pressure of 0.04-0.05 MPa. The metal granules in the crucible are completely melted by induction heating. The mixture is allowed to stand for 2-3 minutes. High-purity magnesium granules are then added to the molten metal through the secondary copper tube. The mixture is allowed to stand for another 3-5 minutes. Finally, the molten alloy is poured into a mold, cooled to room temperature, and the ingot is removed. The alloy ingots were cut into blocks by wire cutting and then solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough-rolled on a two-roll mill at room temperature, with a 20% pass and a roll speed of 30 rpm, for a roughing reduction of 90%. The samples were then finish-rolled on a four-roll mill at room temperature, with a 10% pass and a roll speed of 20 rpm, for a finishing reduction of 90%, resulting in a total rolling reduction of 99%. The cold-rolled alloy samples were aged at 400°C for 40 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0102] Comparative Example 3:

[0103] Comparative Example 3 is based on Comparative Example 1. Raw materials were prepared according to alloy composition mass fractions of 1.80% Ni, 0.62% Si, 1.1% Co, and 0% Mg, with the balance being copper. The Cu purity was ≥99.99%, the Ni purity was ≥99.99%, the Si purity was ≥99.99%, and the Co purity was ≥99.99%. The prepared high-purity copper, nickel, silicon, and cobalt particles were added to a graphite crucible in a vacuum induction melting furnace. High-purity magnesium particles were sealed in a secondary copper tube. The furnace was closed and air was evacuated to 13 Pa. Argon was then introduced to a pressure of 0.04-0.05 MPa. The metal particles in the crucible were completely melted by induction heating and allowed to stand for 2-3 minutes. The high-purity magnesium particles were then added to the molten metal through the secondary copper tube. The mixture was allowed to stand for another 3-5 minutes. Finally, the molten alloy was poured into a mold, cooled to room temperature, and the ingot was removed. The alloy ingots were cut into blocks by wire cutting and then solution treated. After being held at 850°C for 5 hours, they were water-cooled to room temperature, sanded, and cleaned of surface impurities using acetone and alcohol. The alloy samples were rough-rolled on a two-roll mill at room temperature, with a 20% pass and a roll speed of 30 rpm, for a roughing reduction of 90%. The samples were then finish-rolled on a four-roll mill at room temperature, with a 10% pass and a roll speed of 20 rpm, for a finishing reduction of 90%, resulting in a total rolling reduction of 99%. The cold-rolled alloy samples were aged at 400°C for 10 minutes and then air-cooled to room temperature. Strip samples were obtained by wire cutting and analyzed for microstructure, electrical conductivity, and mechanical properties.

[0104] Example 6, Example 7 and Comparative Example 3 were set as the third sample group, and the test results obtained were as follows:

[0105] Table 9 Mechanical properties test results of the third group of samples

[0106]

[0107]

[0108] Table 10 Mechanical property increment of the third group of specimens

[0109] Validity Time 0% Mg 0.12% Mg 0.24% Mg min MPa MPa MPa 0 0 28.32％ 37.07％ 10 0 57.31％ 9.82％ 20 0 66.62％ 15.00％ 30 0 42.60％ -5.80％ 40 0 35.46％ 16.51％ average value 46.06％ 15.2％

[0110] Table 11 Test results of conductivity of the third group of samples

[0111] Validity Time 0% Mg 0.12% Mg 0.24% Mg min %IACS %IACS %IACS 0 39.90782 38.15191 36.46133 10 51.65221 44.41443 45.12694 20 50.70104 46.16517 44.48724 30 51.30139 47.23898 47.85764 40 53.61382 48.39688 45.02679

[0112] Table 12 Conductivity increment of the third group of samples

[0113] Validity Time 0% Mg 0.12% Mg 0.24% Mg min 0 0 -4.40％ -8.64％ 10 0 -14.01％ -12.63％ 20 0 -8.95％ -12.26％ 30 0 -7.92％ -6.71％ 40 0 -9.73％ -16.02％ average value -9％ -11.25％

[0114] Combining the contents in Tables 9 to 12, it can be seen that in the third group of samples, when the magnesium content increases to 0.12%, the average mechanical properties increase by 46.06%, but the electrical conductivity only changes by 9%.

[0115] In the third group of samples, when the magnesium content increased to 0.24%, the average mechanical properties increased by 15.2%, but the electrical conductivity only changed by 11.25%.

[0116] Table 13 Changes in average mechanical properties and electrical conductivity of samples from group 1 to group 3

[0117] parameter 0.12% Mg 0.24% Mg Changes in mechanical properties of the first group of specimens +32.76％ +30.2％ Changes in mechanical properties of the second group of specimens +39.91％ +39.65％ Changes in mechanical properties of the third group of samples +46.06％ +15.2％ Average value of mechanical properties changes +39.58％ 28.35％ Changes in conductivity of the first group of samples -4％ -9.66％ Changes in conductivity of the second group of samples -8.4％ -11.39％ Changes in conductivity of the third group of samples -9％ -11.25％ Average value of conductivity change -7％ -10.8％

[0118] A comprehensive comparison of the three groups of samples shows that when the magnesium content increases to 0.12%, the average change in mechanical properties is 39.58%, but the average change in electrical conductivity is only reduced by 7%. The average change in mechanical properties is 5.65 times that of electrical conductivity.

[0119] When the magnesium content increases to 0.24%, the average change in mechanical properties is 28.35%, but the average change in electrical conductivity is only reduced by 10.8%. The average change in mechanical properties is 2.6 times that of electrical conductivity. This indicates that the introduction of magnesium can effectively improve the material's mechanical properties while minimizing the change in electrical conductivity.

[0120] Example 8

[0121] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0122] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0123] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.12%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0124] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0125] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0126] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0127] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0128] The alloy ingot after solution treatment is rolled, including:

[0129] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0130] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0131] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0132] The rolled alloy is aged at 300°C for 0.5h-4h and then air-cooled to room temperature.

[0133] Example 9

[0134] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0135] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0136] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.24%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0137] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0138] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0139] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0140] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0141] The alloy ingot after solution treatment is rolled, including:

[0142] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0143] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0144] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0145] The rolled alloy is aged at 300°C for 0.5h-4h and then air-cooled to room temperature.

[0146] Comparative Example 4

[0147] Comparative Example 4 was prepared on the basis of Example 8, and differed from Example 8 in that, in Comparative Example 4, the content of magnesium element was 0.

[0148] Example 8, Example 9 and Comparative Example 4 were used as the fourth group of samples. The test results were as follows: Table 14 Mechanical properties of the fourth group of samples

[0149] Can test results

[0150] Validity Time 0% Mg 0.12% Mg 0.24% Mg h MPa MPa MPa 0 590.9 706.5 784.6 0.5 602.1 755.7 784.6 1 532.8 737.8 739.4 2 532.9 709.1 790.3 4 533.3 734.7 766.9

[0151] Table 15 Mechanical property increment of the fourth group of specimens

[0152] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 19.56％ 32.78％ 0.5 0 25.51％ 30.31％ 1 0 38.48％ 38.78％ 2 0 33.06％ 48.30％ 4 0 37.76％ 43.80％ average value 30.88％ 38.79％

[0153] Table 16 Test results of the fourth group of conductive properties of samples

[0154]

[0155]

[0156] Table 17 Conductivity increment of the fourth group of samples

[0157] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 -22.61％ -18.23％ 0.5 0 -9.32％ -11.00％ 1 0 -12.19％ -15.98％ 2 0 -6.64％ -13.69％ 4 0 -2.66％ -12.64％ average value -10.68％ -14.31％

[0158] Combined with the contents recorded in Tables 14 to 17, when the proportion of magnesium element is 0.12%, the average mechanical properties change by 30.88% and the electrical conductivity changes by 10.68%.

[0159] When the magnesium element accounts for 0.24%, the average mechanical properties change by 38.79%, and the conductive properties change by 14.31%.

[0160] Example 10

[0161] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0162] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0163] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.12%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0164] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0165] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0166] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0167] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0168] The alloy ingot after solution treatment is rolled, including:

[0169] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0170] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0171] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0172] The rolled alloy is aged at 350° C. for 0.5 h to 4 h, and then air-cooled to room temperature.

[0173] Example 11

[0174] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0175] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0176] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.24%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0177] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0178] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0179] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0180] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0181] The alloy ingot after solution treatment is rolled, including:

[0182] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0183] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0184] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0185] The rolled alloy is aged at 350° C. for 0.5 h to 4 h, and then air-cooled to room temperature.

[0186] Comparative Example 5

[0187] Comparative Example 5 was prepared on the basis of Example 10, and differed from Example 10 in that, in Example 10, the magnesium content was 0.

[0188] Example 10, Example 11 and Comparative Example 5 were set as the fifth sample group, and the test results obtained were as follows:

[0189] Table 18 Mechanical properties test results of the fifth group of specimens

[0190] Validity Time 0% Mg 0.12% Mg 0.24% Mg h MPa MPa MPa 0 590.9 706.5 784.6 0.5 515.9 711.1 704.1 1 402.5 676.1 726.5 2 466.5 629.6 635.7 4 434.9 629.6 684.4

[0191] Table 19 Mechanical property increment of the fifth group of specimens

[0192] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 19.56％ 32.78％ 0.5 0 37.84％ 36.48％ 1 0 67.98％ 80.50％ 2 0 34.96％ 36.27％ 4 0 44.77％ 57.37％ average value 41.02％ 48.68％

[0193] Table 20 Test results of conductivity of the fifth group of samples

[0194]

[0195]

[0196] Table 21 Conductivity increment of the fifth group of samples

[0197] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 -22.61％ -18.23％ 0.5 0 -6.62％ -15.24％ 1 0 -3.23％ -12.74％ 2 0 4.69％ -8.65％ 4 0 -8.09％ -13.09％ average value -7.17％ -13.59％

[0198] Combined with the contents recorded in Tables 18 to 21, when the proportion of magnesium element is 0.12%, the average mechanical properties change by 41.02% and the electrical conductivity change by 7.17%.

[0199] When the magnesium element accounts for 0.24%, the average mechanical properties change by 48.68%, and the conductive properties change by 13.59%.

[0200] Example 12

[0201] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0202] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0203] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.12%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0204] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0205] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0206] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0207] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0208] The alloy ingot after solution treatment is rolled, including:

[0209] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0210] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0211] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0212] The rolled alloy is aged at 400°C for 0.5h-4h and then air-cooled to room temperature.

[0213] Example 13

[0214] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0215] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0216] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.24%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0217] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0218] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0219] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0220] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0221] The alloy ingot after solution treatment is rolled, including:

[0222] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0223] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0224] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0225] The rolled alloy is aged at 400°C for 0.5h-4h and then air-cooled to room temperature.

[0226] Comparative Example 6

[0227] Comparative Example 6 was prepared on the basis of Example 12. Compared with Example 12, the content of magnesium element in Comparative Example 6 was 0.

[0228] Example 12, Example 13 and Comparative Example 6 were set as the sixth sample group, and the test results obtained were as follows:

[0229] Table 22 Mechanical properties test results of the sixth group of samples

[0230] Validity Time 0% Mg 0.12% Mg 0.24% Mg h MPa MPa MPa 0 590.9 706.5 784.6 0.5 398.3 631.1 637.5 1 397.5 593.1 625.7 2 363.6 530 606.6 4 336.4 499.2 586.6

[0231] Table 23 Mechanical property increment of the sixth group of specimens

[0232] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 19.56％ 32.78％ 0.5 0 58.45％ 60.06％ 1 0 49.21％ 57.41％ 2 0 45.76％ 66.83％ 4 0 48.39％ 74.38％ average value 44.28％ 58.29％

[0233] Table 24 Test results of conductivity of the sixth group of samples

[0234] Validity Time 0% Mg 0.12% Mg 0.24% Mg h %IACS %IACS %IACS 0 47.4875 36.75054 38.82898 0.5 52.64728 47.19631 44.36604 1 50.52195 47.55141 45.1794 2 50.71382 48.4968 44.119 4 51.91675 49.74485 45.50325

[0235] Table 25 Conductivity increment of the sixth group of samples

[0236] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 -22.61％ -18.23％ 0.5 0 -10.35％ -15.73％ 1 0 -5.88％ -10.57％ 2 0 -4.37％ -13.00％ 4 0 -4.18％ -12.35％ average value -9.48％ -13.98％

[0237] Combined with the contents recorded in Tables 21 to 25, when the proportion of magnesium element is 0.12%, the average mechanical properties change by 44.28% and the conductive properties change by 9.48%.

[0238] When the magnesium element accounts for 0.24%, the average mechanical properties change by 58.29%, and the conductive properties change by 13.98%.

[0239] Example 14

[0240] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0241] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0242] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.12%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0243] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0244] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0245] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0246] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0247] The alloy ingot after solution treatment is rolled, including:

[0248] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0249] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0250] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0251] The rolled alloy is aged at 450°C for 0.5h-4h and then air-cooled to room temperature.

[0252] Example 15

[0253] This embodiment provides a method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used for the nickel-silicon-cobalt-magnesium alloy provided in Example 1, comprising the following steps:

[0254] Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting;

[0255] Specifically, raw materials are prepared according to the alloy component mass fractions of Ni: 1.80%, Si: 0.62%, Co: 1.1%, Mg: 0.24%, and the balance is copper, wherein the purity of Cu is ≥99.99%, the purity of Ni is ≥99.99%, the purity of Si is ≥99.99%, and the purity of Co is ≥99.99%.

[0256] The smelting equipment is vacuumed to reduce the internal pressure of the smelting equipment to below 20Pa; inert gas is introduced into the smelting equipment to increase the internal pressure of the smelting equipment to between 0.04-0.05Mpa;

[0257] A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material;

[0258] The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out;

[0259] The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours;

[0260] The alloy ingot after solution treatment is rolled, including:

[0261] The alloy sample was kept at 760℃-800℃ for 0.5h;

[0262] Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%;

[0263] After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%.

[0264] The rolled alloy is aged at 450°C for 0.5h-4h and then air-cooled to room temperature.

[0265] Comparative Example 7

[0266] Comparative Example 7 is made on the basis of Example 14. The difference from Example 14 is that the magnesium content in Comparative Document 7 is 0.

[0267] Example 14, Example 15 and Comparative Example 7 were set as the seventh sample group, and the test results obtained were as follows:

[0268] Table 26 Mechanical properties test results of the seventh group of samples

[0269] Validity Time 0% Mg 0.12% Mg 0.24% Mg h MPa MPa MPa 0 590.9 706.5 784.6 0.5 368.7 552.9 513 1 368.5 514.2 522.4 2 319.6 435.6 493.5 4 303.8 445 426.8

[0270] Table 27 Mechanical property increment of the seventh group of specimens

[0271] Validity Time 0% Mg 0.12% Mg 0.24% Mg h 0 0 19.56％ 32.78％ 0.5 0 49.96％ 39.14％ 1 0 39.54％ 41.76％ 2 0 36.30％ 54.41％ 4 0 46.48％ 40.49％ average value 38.37％ 41.72％

[0272] Table 28 Test results of conductivity of sample group 7

[0273] Validity Time 0% Mg 0.12% Mg 0.24% Mg h %IACS %IACS %IACS 0 47.4875 36.75054 38.82898 0.5 51.32472 47.40258 44.33213 1 51.84251 49.17054 45.17869 2 51.55078 51.05721 46.59814 4 50.71121 52.0571 46.84002

[0274] Table 29 Conductivity increment of sample group 7

[0275]

[0276]

[0277] Combined with the contents recorded in Tables 26 to 29, when the proportion of magnesium element is 0.12%, the average mechanical properties change by 38.37% and the electrical conductivity changes by 6.74%.

[0278] When the magnesium content is 0.24%, the average mechanical properties change by 41.72%, and the electrical conductivity changes by 12.39%.

[0279] Table 30 Changes in average mechanical properties and electrical conductivity of samples from group 4 to group 7

[0280] parameter 0.12% Mg 0.24% Mg Changes in mechanical properties of the fourth group of samples 30.88％ 38.79％ Changes in mechanical properties of the fifth group of specimens 41.02％ 48.68％ Changes in mechanical properties of the sixth group of specimens 44.28％ 58.29％ Changes in mechanical properties of the seventh group of specimens 38.37％ 41.72％ Average value of mechanical properties changes 38.64％ 46.87％ Changes in conductivity of the fourth group of samples -10.68％ -14.31％ Changes in conductivity of the fifth group of samples -7.17％ -13.59％ Changes in conductivity of the sixth group of samples -9.48％ -13.98％ Changes in conductivity of sample group 7 -6.74％ -12.39％ Average value of conductivity change -8.52％ -13.57％

[0281] A comprehensive comparison of samples from groups 4 to 7 shows that when the magnesium content increases to 0.12%, the average change in mechanical properties is 38.64%, but the average change in electrical conductivity is only reduced by 8.52%. The average change in mechanical properties is 4.53 times that of electrical conductivity.

[0282] When the magnesium content increases to 0.24%, the average change in mechanical properties is 46.87%, but the average change in electrical conductivity is only reduced by 13.57%. The change in mechanical properties is 3.45 times that of electrical conductivity.

[0283] In the above examples, the samples obtained by processing need to be tested for conductivity and mechanical properties respectively. The specific test methods are as follows:

[0284] 1. The test method for conductivity is as follows:

[0285] The resistance of the strip was measured using a ZY9987 digital micro-ohmmeter using a sample of size 100mmX10mmX0.2mm (±0.01). The resistivity was calculated using the formula:

[0286] ρ=RS / L (1-1)

[0287] Where ρ is the resistivity (μm.cm); R is the resistance (μm); S is the cross-sectional area (cm2); and L is the effective distance (cm). The electrical conductivity σ(Sm-1) of the composite material can be calculated using formula (1-1):

[0288] σ=1 / ρ (1-2)

[0289] The international standard for measurement is annealed copper wire with a density of 8.89 g / cm³, a length of 1 meter, a mass of 1 g, and a resistance of 0.15328 Ω. At 20°C, the electrical conductivity of this annealed copper wire is determined to be 100% IACS (International Annealed Copper Standard) when it is 58.0 MS / m. The electrical conductivity (% IACS) of the composite material is then calculated using the formula shown in (1-3). The units used for this calculation must be consistent.

[0290] Conductivity (% IACS) = Conductivity (MS / m) / 58.0 * 100% (1-3)

[0291] 2. The test methods for mechanics are as follows:

[0292] Mechanical properties testing involves testing the strength of materials. The strength of materials is tested using a Meters CMT5205 electronic universal testing machine with a set tensile rate of 2 mm / min. 0.2 mm (± 0.01) thick strips are processed using wire cutting. Figure 17 As shown, the tensile direction is consistent with the rolling direction. The sample is polished with 800# sandpaper before testing. To ensure the accuracy of the test results, at least three tensile specimens are required for each test specimen in different states.

[0293] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, which is used to prepare a nickel-silicon-cobalt-magnesium alloy, wherein: The composition comprises 1.80% Ni, 0.62% Si, 1.1% Co, 0.12%-0.24% Mg, and the balance is copper, and is characterized by comprising the following steps: Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting; Perform vacuum operation on the smelting equipment to reduce the air pressure inside the smelting equipment to below 20Pa; Introduce inert gas into the smelting equipment to increase the pressure inside the smelting equipment to between 0.04-0.05Mpa; A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material; The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out; The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours; The alloy ingot after solution treatment is rolled, including: Rough rolling step: rolling temperature is room temperature, single pass reduction is 20%, roll speed is 30 rpm, and rough rolling reduction is 90%; Finishing rolling steps: rolling temperature is room temperature, single pass is 10%, roll speed is 20 rpm, finishing rolling reduction is 90%; total rolling reduction is 99%; After the rolling operation step, the method further includes: performing aging treatment on the rolled alloy at 300-400° C. for 10-40 minutes, and air cooling to room temperature after aging.

2. The method for preparing a copper-nickel-silicon-cobalt-magnesium alloy according to claim 1, wherein: The vacuum induction melting furnace is provided with a copper tube, and the magnesium raw material is introduced into the vacuum induction melting furnace through the copper tube.

3. The method for preparing a copper-nickel-silicon-cobalt-magnesium alloy according to claim 2, wherein: Before the rolling operation step, the alloy ingot is also cleaned, including: polishing with sandpaper and cleaning with acetone and alcohol.

4. A method for preparing a copper-nickel-silicon-cobalt-magnesium alloy, for preparing a nickel-silicon-cobalt-magnesium alloy, wherein: The composition comprises 1.80% Ni, 0.62% Si, 1.1% Co, 0.12%-0.24% Mg, and the balance is copper, and is characterized by comprising the following steps: Putting high-purity copper raw materials, nickel raw materials, silicon raw materials and cobalt raw materials into a smelting device for melting; Perform vacuum operation on the smelting equipment to reduce the air pressure inside the smelting equipment to below 20Pa; Introduce inert gas into the smelting equipment to increase the pressure inside the smelting equipment to between 0.04-0.05Mpa; A magnesium raw material is introduced into a smelting device, and the smelting device is started to melt the magnesium raw material; The molten metal obtained after smelting is allowed to stand, and after cooling to room temperature, the alloy ingot is taken out; The obtained alloy ingot is subjected to a solution treatment operation, wherein the solution treatment temperature is 800° C. to 900° C. and the solution treatment time is 5 hours; The alloy ingot after solution treatment is rolled, including: The alloy sample was kept at 760℃-800℃ for 0.5h; Hot rolling was carried out on a two-roll mill with the following rolling conditions: single pass 30%, roll speed 30 rpm, and hot rolling reduction of 50-55%; After the alloy sample is air-cooled to room temperature, it is rough-rolled on a two-roll mill. The rolling conditions are: room temperature, single pass 20%, roll speed 30 rpm, and rough rolling reduction of 80-85%. The rolled alloy is aged at 430° C. for 0.5 h to 4 h, and then air-cooled to room temperature.

5. The method for preparing a copper-nickel-silicon-cobalt-magnesium alloy according to claim 4, wherein: The vacuum induction melting furnace is provided with a copper tube, and the magnesium raw material is introduced into the vacuum induction melting furnace through the copper tube.

6. The method for preparing a copper-nickel-silicon-cobalt-magnesium alloy according to claim 4, wherein: Before the rolling operation step, the alloy ingot is also cleaned, including: polishing with sandpaper and cleaning with acetone and alcohol.

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