A high-hardness CuNiSi alloy and its plate structure control method

Abstract

The invention discloses a high-hardness CuNiSi alloy and a plate microstructure control method thereof, belonging to the technical field of non-ferrous metal processing. The alloy comprises the following components in weight percentage: Ni 2.0wt% to 2.5wt%, Si 0.3wt% to 0.8wt%, Cr 0.1wt% to 0.5wt%, Al 0.1wt%-0.5wt%, Sn 0.1wt%-0.5wt%, and the remainder Cu. The grain size of the alloy plate is 50μm to 150μm, the size of the intracrystalline precipitation phase of the second phase particles is ≤200nm, the spacing between the intracrystalline precipitation phases of two adjacent second phase particles is ≥150nm, the size of the grain boundary precipitation phase of the second phase particles is ≤50nm, and the grain boundary spacing between two adjacent second phase particles is ≥80nm. The alloy of the present invention not only meets the requirements of hardness and conductivity of the alloy plate, but also obtains low residual stress, and is suitable for various plate applications. The present invention improves the method for controlling the structure of the alloy plate, controls the temperatures involved in the solid solution and aging treatment steps, and achieves the purpose of controlling the structure of the alloy plate in conjunction with hot processing, ensuring that the high hardness, high conductivity and low residual stress characteristics of the alloy material are maintained during processing.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a high-hardness CuNiSi alloy and a plate structure control method thereof. Background Art

[0002] The information age has led to a global IT industry boom. Integrated circuits are the core of modern electronic information technology. Following Moore's Law, chip manufacturing continues to evolve. Currently, global semiconductor manufacturing is trending toward processes of 45nm and below. According to statistical forecasts, from 2016 to 2022, processes of 20nm and below are expected to account for 12% of global chip manufacturing capacity, 32 / 28nm to 90nm for 41%, and micron-scale processes of 130nm and above for 47%. With the advancement of chip manufacturing processes and manufacturing technologies, the performance requirements of various materials are becoming increasingly stringent. For integrated circuit interconnects, aluminum and aluminum alloys are used for processes above 130nm, while high-purity copper is primarily used for processes between 90 and 45nm. At 45nm and below, copper alloys are used as interconnect materials, with high-purity copper and copper alloy targets occupying a crucial position.

[0003] Generally speaking, a sputtering target consists of a target blank that meets sputtering requirements and a backing plate welded to the blank. The backing plate provides support for the target and also conducts heat. The target blank is the target material bombarded by the high-speed ion beam and is the core component of the sputtering target. During the sputtering coating process, after the target is struck by ions, atoms on the target surface are sputtered and deposited on the substrate, forming an electron film. Because high-purity metals are generally soft, the sputtering target must be mounted on a dedicated machine to complete the sputtering process. The machine is subjected to high pressure and high vacuum. Therefore, the target backing plate is primarily used to secure the sputtering target material and requires excellent electrical and thermal conductivity. During magnetron sputtering, the target must simultaneously withstand the cooling water pressure on the back side and the negative vacuum pressure on the front side, making the target backing plate particularly important. Copper and copper alloy plates are typically used as target backing plates because of their high strength and excellent thermal conductivity, which meet the requirements of the semiconductor industry.

[0004] From the perspective of high strength and high conductivity, the use of precipitation-strengthened copper alloys as structural support copper alloys is increasing, replacing the solid solution-strengthened copper alloys represented by phosphor bronze, brass, etc. in the past. For precipitation-strengthened copper alloys, by aging the supersaturated solid solution that has undergone solid solution treatment, fine precipitates are evenly dispersed, the strength of the alloy is improved, and at the same time, the amount of solid solution elements in copper is reduced, and the conductivity is improved. Therefore, a material with excellent mechanical properties such as strength and elasticity and good electrical conductivity and thermal conductivity can be obtained. Among precipitation-strengthened copper alloys, Cu-Ni-Si copper alloys are representative copper alloys with high electrical conductivity, strength and processing performance, and are one of the alloys being intensively developed in the copper alloy industry. This copper alloy achieves improvements in strength and electrical conductivity by precipitating fine NiSi intermetallic compound particles in the copper matrix.

[0005] To further enhance the overall performance of CuNiSi alloys, existing techniques typically involve adding alloying components other than Ni and Si, purifying the alloy melt, optimizing the crystal structure, optimizing the precipitated phase, and refining the processing technology. For example, it is known that overall performance can be enhanced by adding Ag, Co, Zr, and the like, or by controlling the precipitation of second-phase particles from the parent phase. This is often used in Cu-Ni-Si alloy strips. However, for Cu-Ni-Si alloy sheets with a thickness of 10mm-50mm, the final processing state varies, placing higher demands on the alloy's hardness, conductivity, and residual stress during processing. Summary of the Invention

[0006] The present invention provides a high-hardness CuNiSi alloy and a method for controlling the microstructure of a plate thereof, which solves the problem in the prior art of how to maintain a certain thickness in Cu-Ni-Si series alloy plates and during processing so that the material meets the requirements of hardness and conductivity and has low residual stress.

[0007] To solve the above technical problems, the present invention provides a high-hardness CuNiSi alloy, wherein the weight percentage composition of the alloy is: Ni 2.0wt%~2.5wt%, Si 0.3wt%~0.8wt%, Cr 0.1wt%~0.5wt%, Al0.1wt%-0.5wt%, Sn 0.1wt%-0.5wt%, and the rest is Cu.

[0008] The functions of the added alloying elements are:

[0009] Nickel: Nickel can form a nickel-silicon precipitate phase with silicon, inhibiting grain growth and discontinuous reactions at grain boundaries. However, excessive nickel will cause the appearance of β phase in the alloy, seriously affecting the electrical conductivity and fatigue properties of the alloy. Therefore, the nickel content is 2.0wt% to 2.5wt%.

[0010] Silicon: It can refine the grains and improve the comprehensive properties of the alloy. The addition of an appropriate amount of silicon to copper can form a precipitate phase with nickel and chromium to improve the mechanical properties of the alloy. Therefore, the silicon content is 0.3wt% to 0.8wt%.

[0011] Chromium: mainly combines with silicon to form chromium-silicon precipitate phase to make the alloy undergo aging strengthening and refine the grains. Therefore, the chromium content is 0.1wt% to 0.5wt%.

[0012] Aluminum: It mainly plays the role of refining grains, forming an intermediate phase with Si, and is distributed in the crystal to regulate performance and stress. Therefore, the aluminum content is 0.1wt%-0.5wt%.

[0013] Tin: mainly plays the role of enhancing hardness and anti-corrosion, therefore, the tin content is 0.1wt%-0.5wt%.

[0014] Furthermore, the grain size of the alloy plate is 50μm to 150μm, the size of the intragranular precipitation phase of the second phase particles is ≤200nm, the intragranular precipitation phase spacing between two adjacent second phase particles is ≥150nm, the grain boundary precipitation phase size of the second phase particles is ≤50nm, and the grain boundary phase spacing between two adjacent second phase particles is ≥80nm.

[0015] Furthermore, the intracrystalline precipitated phase of the second phase particles includes Al, the precipitated phase of the second phase particles containing Al is precipitated in the crystal, and the size of the precipitated phase of the second phase particles containing Al is ≤50 nm.

[0016] The present invention also provides a method for controlling the microstructure of a high-hardness CuNiSi alloy plate, the method comprising the following steps:

[0017] S1. Melting, adding raw materials according to weight percentage;

[0018] S2. Solution treatment, heating in a walking beam furnace or resistance furnace;

[0019] S3. Hot working: total processing rate ≥ 85% and post-processing temperature ≥ 700°C;

[0020] S4. Aging treatment.

[0021] Furthermore, the raw materials added to S1 are electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin in sequence.

[0022] Furthermore, the S1 includes:

[0023] S1-1. Add raw materials in sequence;

[0024] S1-2. Melting temperature is 1300℃ until completely melted;

[0025] S1-3. Keep warm for 20 minutes and stir thoroughly;

[0026] S1-4. Let it stand for 5 minutes and then take it out of the furnace by continuous casting or pouring.

[0027] Furthermore, the S2 includes heating to a temperature of 920° C.-1050° C. and keeping the temperature for 6 hours.

[0028] Furthermore, the hot working in S3 is hot rolling or hot forging, and the cooling method is water cooling, and the water temperature of the water cooling is 0-30°C.

[0029] Furthermore, the S4 includes: heating the bell-type annealing furnace to temperature T1, keeping it warm for 1-16 hours, cooling it to temperature T2 with the furnace, keeping it warm for 2 hours, and air cooling it to room temperature. The difference between the heating temperature and the cooling temperature of the bell-type annealing furnace is 100°C-300°C.

[0030] Furthermore, the T1 is 450°C-550°C, and the T2 is 250°C-350°C.

[0031] The advantages and beneficial effects of the present invention are:

[0032] The present invention designs and optimizes the composition of the CuNiSi alloy. The alloy comprises 2.0wt% to 2.5wt% Ni, 0.3wt% to 0.8wt% Si, 0.1wt% to 0.5wt% Cr, 0.1wt% to 0.5wt% Al, 0.1wt% to 0.5wt% Sn, and the remainder Cu. The alloy not only meets the requirements for hardness and electrical conductivity of the alloy plate, but also has low residual stress, making it suitable for use in various types of plates. The present invention achieves the purpose of structural regulation of the alloy plate by improving the method for regulating the structure of the alloy plate, controlling the temperatures involved in the solid solution and aging treatment steps, and coordinating with hot processing. The processed alloy plate has a hardness of 182-242 Hv, a conductivity of 45-55% IACS, and a residual stress of ≤50 MPa; it has high elasticity, high strength, good electrical conductivity, and low residual stress, and can be applied to various types of copper alloy plates for crystallizers, supports, and heat dissipation devices with high requirements for reliability and flatness, ensuring that the high hardness, high conductivity, and low residual stress characteristics of the alloy material are maintained while the plate is processed. DETAILED DESCRIPTION

[0033] The present invention discloses a high-hardness CuNiSi alloy, comprising the following weight percentages: Ni 2.0-2.5%, Si 0.3-0.8%, Cr 0.1-0.5%, Al 0.1-0.5%, Sn 0.1-0.5%, and the remainder Cu. The alloy plate has a grain size of 50-150 μm, an intragranular precipitation phase size of second-phase particles ≤200 nm, an intragranular precipitation phase spacing between two adjacent second-phase particles ≥150 nm, a grain boundary precipitation phase size of second-phase particles ≤50 nm, and a grain boundary phase spacing between two adjacent second-phase particles ≥80 nm. The intragranular precipitation phase of the second-phase particles includes Al, and the precipitation phases of the Al-containing second-phase particles are all intragranularly precipitated, with the precipitation phase size of the Al-containing second-phase particles ≤50 nm.

[0034] The functions of the added alloying elements are:

[0035] Nickel: Nickel can form a nickel-silicon precipitate phase with silicon, inhibiting grain growth and discontinuous reactions at grain boundaries. However, excessive nickel will cause the appearance of β phase in the alloy, seriously affecting the electrical conductivity and fatigue properties of the alloy. Therefore, the nickel content is 2.0wt% to 2.5wt%.

[0036] Silicon: It can refine the grains and improve the comprehensive properties of the alloy. The addition of an appropriate amount of silicon to copper can form a precipitate phase with nickel and chromium to improve the mechanical properties of the alloy. Therefore, the silicon content is 0.3wt% to 0.8wt%.

[0037] Chromium: mainly combines with silicon to form chromium-silicon precipitate phase to make the alloy undergo aging strengthening and refine the grains. Therefore, the chromium content is 0.1wt% to 0.5wt%.

[0038] Aluminum: It mainly plays the role of refining grains, forming an intermediate phase with Si, and is distributed in the crystal to regulate performance and stress. Therefore, the aluminum content is 0.1wt%-0.5wt%.

[0039] Tin: mainly plays the role of enhancing hardness and anti-corrosion, therefore, the tin content is 0.1wt%-0.5wt%.

[0040] The high-hardness CuNiSi alloy of the present invention not only meets the requirements of hardness and electrical conductivity of the alloy plate, but also obtains low residual stress, and is suitable for application of various plates.

[0041] The above-mentioned high-hardness CuNiSi alloy plate microstructure control method comprises the following steps:

[0042] S1. Melting, adding raw materials according to weight percentage.

[0043] S1-1. Add raw materials in sequence, wherein the raw materials added are electrolytic copper, pure nickel, nickel silicon alloy, copper chromium alloy, pure aluminum, and pure tin.

[0044] S1-2. Melting temperature is 1300℃ until completely melted.

[0045] S1-3. Keep warm for 20 minutes and stir thoroughly.

[0046] S1-4. Let it stand for 5 minutes, then use continuous casting or pouring to take it out of the furnace, with the casting temperature being 1220℃.

[0047] S2. Solution treatment: heating is performed in a stepping furnace or resistance furnace at 920°C-1050°C for 6 hours to ensure temperature stability and uniformity and to achieve full solution of the material.

[0048] S3. Hot working: Hot rolling or hot forging, with a total processing rate of ≥85% and a temperature after processing of ≥700°C. Cooling is by water cooling at a temperature of 0-30°C; this ensures a solid solution effect and prevents the precipitation and growth of the second phase.

[0049] S4. Aging treatment. The hot-rolled billet or hot-forged billet with good solid solution effect is heated to temperature T1 in a bell-type annealing furnace, T1 is 450-550℃, kept warm for 1-16 hours, cooled with the furnace to temperature T2, T2 is 250-350℃, kept warm for 2 hours, and air-cooled to room temperature. The difference between the heating temperature and the cooling temperature of the bell-type annealing furnace is 100-300℃. Ensure that the second phase in the material is fully precipitated, and adjust the grain size of the alloy plate to 50μm~150μm, the size of the intragranular precipitation phase of the second phase particles is ≤200nm, the intragranular precipitation phase spacing between two adjacent second phase particles is ≥150nm, the grain boundary precipitation phase size of the second phase particles is ≤50nm, and the grain boundary phase spacing between two adjacent second phase particles is ≥80nm. Furthermore, the intracrystalline precipitated phase of the second phase particles includes Al, the precipitated phase of the second phase particles containing Al is precipitated in the crystal, and the size of the precipitated phase of the second phase particles containing Al is ≤50 nm.

[0050] Example 1

[0051] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 1 in Table 1.

[0052] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0053] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0054] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0055] 4. After being heated to 450°C and kept at this temperature for 6 hours in a bell-type annealing furnace, the product was cooled to 250°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 1 in Table 2.

[0056] Example 2:

[0057] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 2 of Table 1.

[0058] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0059] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 920℃, keeping warm for 6 hours.

[0060] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0061] 4. After being heated to 450°C and kept at this temperature for 4 hours in a bell-type annealing furnace, the product was cooled to 260°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 2 in Table 2.

[0062] Example 3:

[0063] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 3 of Table 1.

[0064] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0065] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 930℃, keeping warm for 6 hours.

[0066] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0067] 4. After being heated to 460°C and kept at this temperature for 7 hours in a bell-type annealing furnace, the product was cooled to 260°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 3 in Table 2.

[0068] Example 4:

[0069] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 4 in Table 1.

[0070] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0071] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 940℃, keeping warm for 6 hours.

[0072] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0073] 4. After being heated to 470°C and kept at this temperature for 6 hours in a bell-type annealing furnace, the product was cooled to 270°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 4 in Table 2.

[0074] Example 5:

[0075] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 5 of Table 1.

[0076] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0077] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0078] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0079] 4. After being heated to 480°C and kept at this temperature for 6 hours in a bell-type annealing furnace, the product was cooled to 280°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 5 in Table 2.

[0080] Example 6:

[0081] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 6 of Table 1.

[0082] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0083] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 960℃, keeping warm for 6 hours.

[0084] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0085] 4. After being heated to 490°C and held in a bell-type annealing furnace for 6 hours, the product was cooled to 290°C and held in a bell-type annealing furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 6 in Table 2.

[0086] Example 7:

[0087] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 7 of Table 1.

[0088] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0089] 2. Heating in a walking beam furnace or resistance furnace: heating to 970°C, keeping warm for 6 hours.

[0090] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0091] 4. After being heated to 490°C in a bell-type annealing furnace and kept at this temperature for 6 hours, the product was cooled to 290°C in the furnace and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 7 in Table 2.

[0092] Example 8:

[0093] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 8 in Table 1.

[0094] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0095] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 980℃, keeping warm for 6 hours.

[0096] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0097] 4. After being heated to 500°C in a bell-type annealing furnace for 6 hours, the product was cooled to 300°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 8 in Table 2.

[0098] Example 9:

[0099] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 9 in Table 1.

[0100] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0101] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 990℃, keeping warm for 6 hours.

[0102] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0103] 4. After being heated to 510°C and kept at this temperature for 6 hours in a bell-type annealing furnace, the product was cooled to 310°C and kept at this temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 9 in Table 2.

[0104] Example 10:

[0105] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 10 in Table 1.

[0106] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0107] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1000℃, keeping warm for 6 hours.

[0108] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0109] 4. After being heated to 520°C and held in a bell-type annealing furnace for 6 hours, the product was cooled to 320°C and held in a bell-type annealing furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 10 in Table 2.

[0110] Example 11:

[0111] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 11 in Table 1.

[0112] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0113] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1010℃, keeping warm for 6 hours.

[0114] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0115] 4. After heating to 530°C and holding for 6 hours in a bell-type annealing furnace, the product was cooled to 330°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 11 in Table 2.

[0116] Example 12:

[0117] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 12 of Table 1.

[0118] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0119] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1020℃, keeping warm for 6 hours.

[0120] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0121] 4. After being heated to 540°C and held in a bell-type annealing furnace for 6 hours, the product was cooled to 340°C and held in a bell-type annealing furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 12 in Table 2.

[0122] Example 13:

[0123] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 13 of Table 1.

[0124] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0125] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1030℃, keeping warm for 6 hours.

[0126] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0127] 4. After being heated to 550°C and held for 6 hours in a bell-type annealing furnace, the product was cooled to 350°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 13 in Table 2.

[0128] Example 14:

[0129] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 14 in Table 1.

[0130] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0131] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1050℃, keeping warm for 6 hours.

[0132] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0133] 4. After being heated to 550°C and held in a bell-type annealing furnace for 6 hours, the product was cooled to 350°C and held in a bell-type annealing furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 14 in Table 2.

[0134] Example 15:

[0135] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 15 of Table 1.

[0136] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0137] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1050℃, keeping warm for 6 hours.

[0138] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0139] 4. After heating to 450°C in a bell-type annealing furnace and holding for 16 hours, the product was cooled to 350°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 15 in Table 2.

[0140] Example 16:

[0141] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 16 in Table 1.

[0142] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0143] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0144] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0145] 4. After heating to 550°C and holding for 1 hour in a bell-type annealing furnace, the product was cooled to 250°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 16 in Table 2.

[0146] Example 17:

[0147] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 17 in Table 1.

[0148] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0149] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0150] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0151] 4. After heating to 450°C in a bell-type annealing furnace and holding for 6 hours, the product was cooled to 250°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 17 in Table 2.

[0152] Example 18:

[0153] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 18 in Table 1.

[0154] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0155] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0156] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0157] 4. After heating to 450°C in a bell-type annealing furnace and holding for 6 hours, the product was cooled to 250°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 18 in Table 2.

[0158] Example 19:

[0159] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 19 in Table 1.

[0160] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0161] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 920℃, keeping warm for 6 hours.

[0162] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0163] 4. After heating to 480°C in a bell-type annealing furnace for 3 hours, the product was cooled to 280°C in the furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 19 in Table 2.

[0164] Example 20:

[0165] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 20 in Table 1.

[0166] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0167] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1020℃, keeping warm for 6 hours.

[0168] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0169] 4. After heating to 480°C in a bell-type annealing furnace and holding for 16 hours, the product was cooled to 310°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 20 in Table 2.

[0170] Example 21:

[0171] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 21 in Table 1.

[0172] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0173] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 930℃, keeping warm for 6 hours.

[0174] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0175] 4. After heating to 530°C and holding for 2 hours in a bell-type annealing furnace, the product was cooled to 330°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 21 in Table 2.

[0176] Example 22:

[0177] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 22 of Table 1.

[0178] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0179] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1030℃, keeping warm for 6 hours.

[0180] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0181] 4. After being heated to 490°C and held in a bell-type annealing furnace for 7 hours, the product was cooled to 260°C and held in a bell-type annealing furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 22 in Table 2.

[0182] Example 23:

[0183] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 23 of Table 1.

[0184] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0185] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1030℃, keeping warm for 6 hours.

[0186] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0187] 4. After being heated to 500°C in a bell-type annealing furnace for 4 hours, the product was cooled to 350°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 23 in Table 2.

[0188] Example 24:

[0189] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 24 in Table 1.

[0190] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0191] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 980℃, keeping warm for 6 hours.

[0192] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0193] 4. After heating to 540°C and holding for 1 hour in a bell-type annealing furnace, the product was cooled to 340°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 24 in Table 2.

[0194] Example 25:

[0195] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 25 of Table 1.

[0196] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0197] 2. Heating in a walking beam furnace or resistance furnace: heating to 970°C, keeping warm for 6 hours.

[0198] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0199] 4. After heating to 530°C in a bell-type annealing furnace and holding for 12 hours, the product was cooled to 280°C in the furnace and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 25 in Table 2.

[0200] Example 26:

[0201] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 26 in Table 1.

[0202] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0203] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1020℃, keeping warm for 6 hours.

[0204] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0205] 4. After heating to 530°C in a bell-type annealing furnace and holding for 5 hours, the product was cooled to 300°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 26 in Table 2.

[0206] Example 27:

[0207] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 27 in Table 1.

[0208] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0209] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1040℃, keep warm for 6 hours.

[0210] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0211] 4. After heating to 470°C in a bell-type annealing furnace for 15 hours, the product was cooled to 320°C in the furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 27 in Table 2.

[0212] Example 28:

[0213] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 28 in Table 1.

[0214] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0215] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 940℃, keeping warm for 6 hours.

[0216] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0217] 4. After heating to 460°C in a bell-type annealing furnace for 2 hours, the product was cooled to 260°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 28 in Table 2.

[0218] Example 29:

[0219] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 28 in Table 1.

[0220] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0221] 2. Heating in a walking beam furnace or resistance furnace: heating to 970°C, keeping warm for 6 hours.

[0222] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0223] 4. After heating to 490°C in a bell-type annealing furnace for 15 hours, the product was cooled to 270°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 29 in Table 2.

[0224] Example 30:

[0225] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 30 in Table 1.

[0226] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0227] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1020℃, keeping warm for 6 hours.

[0228] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0229] 4. After heating to 490°C in a bell-type annealing furnace and holding for 16 hours, the product was cooled to 250°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 30 in Table 2.

[0230] Example 31:

[0231] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 31 in Table 1.

[0232] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0233] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 930℃, keeping warm for 6 hours.

[0234] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0235] 4. After heating to 470°C in a bell-type annealing furnace and holding for 4 hours, the product was cooled to 330°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 31 in Table 2.

[0236] Example 32:

[0237] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 32 of Table 1.

[0238] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0239] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 930℃, keeping warm for 6 hours.

[0240] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0241] 4. After heating to 470°C in a bell-type annealing furnace and holding for 14 hours, the product was cooled to 290°C in the furnace and held for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 32 in Table 2.

[0242] Example 33:

[0243] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 33 in Table 1.

[0244] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0245] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1030℃, keeping warm for 6 hours.

[0246] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0247] 4. After heating to 490°C in a bell-type annealing furnace and holding for 1 hour, the product was cooled to 340°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 33 in Table 2.

[0248] Example 34:

[0249] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 34 in Table 1.

[0250] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0251] 2. Heating in a walking beam furnace or resistance furnace: heating to 970°C, keeping warm for 6 hours.

[0252] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0253] 4. After heating to 460°C in a bell-type annealing furnace for 2 hours, the product was cooled to 290°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 34 in Table 2.

[0254] Example 35:

[0255] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 35 in Table 1.

[0256] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0257] 2. Heating in a walking beam furnace or resistance furnace: heating to 970°C, keeping warm for 6 hours.

[0258] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0259] 4. After heating to 470°C in a bell-type annealing furnace and holding for 8 hours, the product was cooled to 330°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 35 in Table 2.

[0260] Example 36:

[0261] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 36 in Table 1.

[0262] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0263] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1010℃, keeping warm for 6 hours.

[0264] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0265] 4. After heating to 460°C in a bell-type annealing furnace for 2 hours, the product was cooled to 310°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 36 in Table 2.

[0266] Example 37:

[0267] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 37 in Table 1.

[0268] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0269] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1050℃, keeping warm for 6 hours.

[0270] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0271] 4. After heating to 470°C in a bell-type annealing furnace and holding for 8 hours, the product was cooled to 320°C and held for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 37 in Table 2.

[0272] Example 38:

[0273] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 38 in Table 1.

[0274] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0275] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1010℃, keeping warm for 6 hours.

[0276] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0277] 4. After heating to 480°C in a bell-type annealing furnace and holding for 16 hours, the product was cooled to 260°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 38 in Table 2.

[0278] Example 39:

[0279] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 39 in Table 1.

[0280] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0281] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1040℃, keep warm for 6 hours.

[0282] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0283] 4. After heating to 520°C in a bell-type annealing furnace and holding for 16 hours, the product was cooled to 270°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 39 in Table 2.

[0284] Example 40:

[0285] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 40 in Table 1.

[0286] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0287] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 1050℃, keeping warm for 6 hours.

[0288] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0289] 4. After heating to 530°C in a bell-type annealing furnace for 4 hours, the product was cooled to 260°C in the furnace and kept at that temperature for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, its properties and microstructure are shown in Example 40 in Table 2.

[0290] Example 41:

[0291] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 41 in Table 1.

[0292] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0293] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 940℃, keeping warm for 6 hours.

[0294] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0295] 4. After heating to 500°C in a bell-type annealing furnace for 11 hours, the product was cooled to 250°C in the furnace and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 41 in Table 2.

[0296] Example 42:

[0297] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 42 in Table 1.

[0298] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0299] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0300] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0301] 4. After heating to 460°C in a bell-type annealing furnace for 8 hours, the product was cooled to 320°C in the furnace for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 42 in Table 2.

[0302] Example 43:

[0303] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 43 in Table 1.

[0304] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0305] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0306] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0307] 4. After heating to 490°C in a bell-type annealing furnace and holding for 15 hours, the product was cooled to 250°C and held for 2 hours, and then air-cooled to room temperature. After the above melting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 43 in Table 2.

[0308] Example 44:

[0309] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 44 in Table 1.

[0310] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0311] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 930℃, keeping warm for 6 hours.

[0312] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0313] 4. After heating to 470°C in a bell-type annealing furnace and holding for 13 hours, the product was cooled to 270°C and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Example 44 in Table 2.

[0314] Example 45:

[0315] The alloy of the present invention is smelted using the following raw materials: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. The composition of the alloy is shown in Example 45 in Table 1.

[0316] 1. Melting: Use semi-continuous casting or vacuum induction furnace for melting. The order of adding alloys is: electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin. Raise the temperature to 1300°C until the melt is completely melted. Hold the temperature for 20 minutes, stir thoroughly, and let it stand for 5 minutes before continuous casting or pouring out of the furnace. The casting temperature is 1220°C.

[0317] 2. Heating in a walking beam furnace or resistance furnace: heating temperature 950℃, keeping warm for 6 hours.

[0318] 3. Hot rolling or hot forging: ensure that the total processing rate is ≥85%, and the temperature after processing is ≥700℃, and water cooling is carried out.

[0319] 4. After heating to 520°C in a bell-type annealing furnace for 7 hours, the product was cooled to 290°C in the furnace and held for 2 hours, and then air-cooled to room temperature. After the above smelting, solution treatment, hot working, and aging treatment, the properties and microstructure of the product are shown in Table 2 for Example 45.

[0320] Comparative Example: C7025 alloy was selected, and the composition of C7025 alloy included: 3wt% nickel (Ni), 0.65wt% silicon (Si), 0.15wt% magnesium (Mg), and the balance was Cu.

[0321] Table 1 Weight percentage of alloy components of Examples 1-45

[0322]

[0323]

[0324] Table 2 Main properties and microstructure of Examples 1-45

[0325]

[0326]

[0327]

[0328] The alloy plate obtained by processing a high-hardness CuNiSi alloy plate structure control method of the present invention can precipitate a crystal phase compared with a comparative example, wherein the maximum size of the intracrystalline precipitation phase of the second-phase particles is between 94 and 179 nm, the minimum spacing of the intracrystalline precipitation phase is between 181 and 298 nm, the maximum size of the grain boundary precipitation phase of the second-phase particles is between 20 and 45 nm, the minimum spacing of the grain boundary precipitation phase is between 101 and 235 nm, the Al-containing second-phase particle precipitation phases are all precipitated within the crystal, and the size of the Al-containing second-phase particle precipitation phases is ≤50 nm. The obtained plate has a hardness of 182-242 Hv, an electrical conductivity of 45-55% IACS, and a residual stress of ≤50 MPa. The plate has high elasticity, high strength, good electrical conductivity, and low residual stress, and can be applied to various types of crystallizers, support parts, and heat dissipation device copper alloy plates with high requirements for reliability and flatness.

Claims

1. A high-hardness CuNiSi alloy, characterized in that: The alloy comprises the following weight percentages: Ni 2.0wt% to 2.5wt%, Si 0.3wt% to 0.8wt%, Cr 0.1wt% to 0.5wt%, Al 0.1wt% to 0.5wt%, Sn 0.1wt% to 0.5wt%, and the remainder is Cu; the grain size of the alloy plate is 50μm to 150μm, the size of the intracrystalline precipitation phase of the second phase particles is ≤200nm, the spacing between the intracrystalline precipitation phases of two adjacent second phase particles is ≥150nm, the size of the grain boundary precipitation phase of the second phase particles is ≤50nm, and the spacing between the grain boundaries of two adjacent second phase particles is ≥80nm; the intracrystalline precipitation phase of the second phase particles includes Al, the precipitation phases of the second phase particles containing Al are all precipitated within the crystal, and the size of the precipitation phases of the second phase particles containing Al is ≤50nm.

2. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 1 is characterized in that: The method comprises the following steps: S1. Melting, adding raw materials according to weight percentage; S2. Solution treatment, heating in a walking beam furnace or resistance furnace; S3. Hot working: total processing rate ≥ 85% and post-processing temperature ≥ 700°C; S4. Aging treatment.

3. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 2, wherein: The raw materials added to S1 are electrolytic copper, pure nickel, nickel-silicon alloy, copper-chromium alloy, pure aluminum, and pure tin in order.

4. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 3, wherein: Said S1 comprises: S1-1. Add raw materials in sequence; S1-2. Melting temperature is 1300℃ until completely melted; S1-3. Keep warm for 20 minutes and stir thoroughly; S1-4. Let it stand for 5 minutes and then take it out of the furnace by continuous casting or pouring.

5. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 2, wherein: The step S2 includes heating the temperature to 920° C.-1050° C. and keeping the temperature for 6 hours.

6. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 2, wherein: The hot working in S3 is hot rolling or hot forging, and the cooling method is water cooling, and the water temperature of the water cooling is 0-30°C.

7. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 2, wherein: The S4 includes: heating the bell-type annealing furnace to temperature T1, keeping it warm for 1-16 hours, cooling it with the furnace to temperature T2, keeping it warm for 2 hours, and air cooling it to room temperature. The difference between the heating temperature and the cooling temperature of the bell-type annealing furnace is 100°C-300°C.

8. The method for controlling the microstructure of a high-hardness CuNiSi alloy sheet according to claim 7, wherein: The T1 is 450°C-550°C, and the T2 is 250°C-350°C.

Images