High-performance CuNiSiTiBMg-series elastic copper alloy and preparation method thereof

[0039] Example 1:

[0040] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention. In terms of weight percentage, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.0%, Si 2.0%, Ti 1.0%, B0.1%, Mg 0.2%, the rest is Cu and unavoidable impurities.

[0041] The preparation method of the high-performance CuNiSiTiBMg series elastic copper alloy of this embodiment includes the following steps:

[0042] (1) Prepare materials according to the weight percentages of the constituent elements in the high-performance CuNiSiTiBMg elastic copper alloy. Put the electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace to melt at a melting temperature of 1250°C. After they are completely melted , Cooling down to 1250℃, then adding pure magnesium to form an alloy melt after melting;

[0043] (2) Continuously cast the alloy melt into slabs on a continuous casting machine, control the casting temperature to 1150℃, the casting speed to 2m/h, and the cooling water pressure to 0.1MPa to obtain the ingot slab;

[0044] (3) The ingot slab is heated to 860°C and kept for 1 hour, then hot-rolled after the temperature is kept, and the hot-rolling deformation is 80%;

[0045] (4) The hot-rolled sheet is pickled, and then solution treated in a hydrogen-protected holding furnace. The temperature of the solution treatment is 950℃ and the time is 4h;

[0046] (5) Pickling the plate after solution treatment, and then aging treatment in an argon-protected holding furnace. The temperature of the aging treatment is 550℃ and the time is 1h;

[0047] (6) Pickling the plate after aging treatment, and then rolling the two layers of plates together, each rolling deformation is 80%. After rolling, the plates are mechanically welded together, and the plates are stacked again through the rolling mill. Stack rolling 5 times;

[0048] (7) Carry out low-temperature annealing treatment on the stacked plate in an argon-protected holding furnace, the annealing temperature is 220℃, and the annealing time is 1h;

[0049] (8) Cut and pack into storage.

[0050] After testing, the high-performance CuNiSiTiBMg elastic copper alloy prepared in this example has a tensile strength of 1195.2MPa, a yield strength of 810.6MPa, an electrical conductivity of 25.3% IACS, an elongation rate of 12.2%, and room temperature stress relaxation rate 6.0%, the relaxation rate at 200°C is 13.1%.

[0051] Example 2:

[0052] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention. In terms of weight percentage, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.2%, Si 2.2%, Ti 1.2%, B0.3%, Mg is 0.24%, the rest is Cu and unavoidable impurities.

[0053] The preparation method of the high-performance CuNiSiTiBMg series elastic copper alloy of this embodiment includes the following steps:

[0054] (1) Prepare materials according to the weight percentages of the constituent elements in the high-performance CuNiSiTiBMg elastic copper alloy. Put the electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace to melt at a melting temperature of 1250°C. After they are completely melted , Cooling down to 1250℃, then adding copper-boron master alloy and pure magnesium to form an alloy melt after melting;

[0055] (2) Continuously cast the alloy melt into a slab on a continuous casting machine, control the casting temperature to 1150℃, the casting speed to 1.8m/h, and the cooling water pressure to 0.08MPa to obtain the ingot slab;

[0056] (3) The ingot slab is heated to 880°C and kept for 1 hour, then hot-rolled after keeping the temperature, the hot-rolling deformation is 60%;

[0057] (4) The hot-rolled sheet is pickled and then solution treated in a carbon monoxide-protected holding furnace. The temperature of the solution treatment is 960°C and the time is 8h;

[0058] (5) Pickling the plate after solution treatment, and then aging treatment in a holding furnace protected by nitrogen gas, the temperature of the aging treatment is 520℃, and the time is 1h;

[0059] (6) Pickling the plate after aging treatment, and then rolling the two layers of plates together, each rolling deformation is 60%, after rolling, the plates are mechanically welded together, and the plates are stacked again through the rolling mill. Stack rolling 7 times;

[0060] (7) Carry out low-temperature annealing treatment on the stacked plates in a hydrogen-protected holding furnace, the annealing temperature is 210°C, and the annealing time is 1h;

[0061] (8) Cut and pack into storage.

[0062] After testing, the high-performance CuNiSiTiBMg elastic copper alloy prepared in this example has a tensile strength of 1214.3MPa, a yield strength of 850.2MPa, an electrical conductivity of 24.6% IACS, an elongation of 10.4%, and a room temperature stress relaxation rate 5.9%, the relaxation rate at 200°C is 13.0%.

[0063] Example 3:

[0064] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention. In terms of weight percentage, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.8%, Si 2.1%, Ti 1.0%, B0.1%, Mg is 0.25%, and the rest is Cu and unavoidable impurities.

[0065] The preparation method of the high-performance CuNiSiTiBMg series elastic copper alloy of this embodiment includes the following steps:

[0066] (1) Prepare materials according to the weight percentages of the constituent elements in the high-performance CuNiSiTiBMg elastic copper alloy. Put the electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace to melt at a melting temperature of 1250°C. After they are completely melted , Lower the temperature to 1200℃, then add copper-boron master alloy and pure magnesium, and form an alloy melt after melting;

[0067] (2) Continuously cast the alloy melt into a slab on a continuous casting machine, control the casting temperature to 1180℃, the casting speed to 1.6m/h, and the cooling water pressure to 0.08MPa to obtain the ingot slab;

[0068] (3) The ingot slab is heated to 880°C and kept for 1.5 hours, and then hot-rolled after the temperature is kept, and the hot-rolling deformation is 80%;

[0069] (4) The hot-rolled sheet is pickled, and then solution treated in an argon-protected holding furnace. The temperature of the solution treatment is 965℃ and the time is 6h;

[0070] (5) Pickling the plate after solution treatment, and then aging treatment in a hydrogen-protected holding furnace. The temperature of the aging treatment is 550℃ and the time is 1h;

[0071] (6) Pickling the plate after aging treatment, and then rolling the two layers of plates together, each rolling deformation is 50%, after rolling, the plates are mechanically welded together, and the plates are stacked again through the rolling mill. Stack rolling 8 times;

[0072] (7) Carry out low-temperature annealing treatment on the stacked-rolled plate in an argon-protected holding furnace, the annealing temperature is 250℃, and the annealing time is 30min;

[0073] (8) Cut and pack into storage.

[0074] In this embodiment, the metallographic microstructure of the ingot slab obtained after step (2) is as follows figure 1 As shown in the figure, it can be seen that a large number of non-equilibrium precipitated phase particles are formed in the alloy; this kind of precipitated phase particles can form supersaturated solid solution through solution treatment, and then precipitate at the nanometer level in the subsequent aging treatment, step (5) The transmission electron microscope photos of the resulting plates are as follows figure 2 As shown in the figure, it can be seen that there are many types of precipitated phases in the alloy, with large volume fractions and uniform distribution; and dense precipitated phase particles can effectively strengthen the alloy material, while increasing the strength and conductivity of the material; and then undergo multiple rolling treatments. , The TEM photo of the plate obtained after step (6) is as image 3 As shown in the figure, it can be seen that the precipitated phase and matrix in the alloy have been nano-sized, which improves the strength and plasticity of the alloy at the same time. After testing, the high-performance CuNiSiTiBMg elastic copper alloy prepared in this example has a tensile strength of 1250.2MPa, a yield strength of 950.2MPa, an electrical conductivity of 24.5% IACS, an elongation rate of 9.8%, and room temperature stress relaxation rate 5.8%, the relaxation rate at 200°C is 12.8%.