A method for preparing a high-strength, high-ductility mixed-crystal copper alloy

Abstract

This invention discloses a method for preparing a high-strength, ductile mixed-crystal copper alloy, belonging to the field of copper alloy manufacturing technology. The method includes the following steps: heating a copper alloy to a molten state in two crucibles; adding alumina powder to one of the crucibles; transferring the molten copper alloy in the crucible to a funnel in a spray forming device, allowing the alloy to flow into an atomizing device; using high-pressure inert gas atomization and low-pressure inert gas atomization processes respectively, forming a solid-liquid two-phase particle jet stream through dual-flow atomization; spraying the jet stream onto a substrate, cooling to form a copper alloy billet; and performing post-processing according to the copper alloy element ratio. The mixed-crystal copper alloy prepared by this invention through dual-flow atomization exhibits excellent ductility and strength properties, effectively resolving the contradiction of simultaneously improving ductility and strength in copper alloys, and has broad application prospects.

Description

Technical Field

[0001] This invention belongs to the field of copper alloy manufacturing technology, specifically relating to a method for preparing a high-strength, ductile mixed-crystal copper alloy. Background Technology

[0002] Copper itself is a metal with good ductility, but its strength is relatively low. Traditional copper strengthening methods, such as alloying and heat treatment, while improving the strength of copper alloys, often come at the cost of sacrificing ductility. This is because the strengthening process may increase internal defects in copper, such as dislocations and grain boundaries. These defects can become crack initiation sites under external forces, thus reducing the ductility of the copper alloy. Furthermore, the strength and ductility of copper alloys are also affected by processing techniques. For example, large plastic deformation followed by annealing can introduce nanotwins into copper alloys, which helps improve ductility. However, improper annealing can lead to grain growth, reducing the number of twins and thus decreasing both the strength and ductility of the copper alloy. This contradiction between strength and ductility limits the applications of copper alloys. Therefore, it is essential to improve both the ductility and strength of copper alloys simultaneously. Currently, traditional deformation strengthening and heat treatment methods are insufficient to overcome the inverse relationship between strength and ductility in copper alloys, significantly limiting the further application of high-strength, high-ductility copper alloys. Mixed-crystal copper alloys, due to their unique microstructure, can effectively resolve the contradiction between high strength and ductility in copper alloys, thus comprehensively improving their performance. By preparing mixed-crystal structures with copper alloy grains of different sizes, copper alloys can simultaneously possess high strength and ductility, thereby developing mixed-crystal copper alloy structural materials.

[0003] Currently, there are two main methods for preparing mixed-crystal copper alloy structural materials: one-step and two-step methods. The one-step method can be further divided into annealing roughening and localized refining. Annealing roughening refers to first obtaining a homogeneous structure through large plastic deformation or traditional hot deformation treatment, and then subjecting the homogeneous copper alloy to subsequent heat treatment, causing some grains in the homogeneous copper alloy to grow, thus forming a multi-scale grain structure in the copper alloy. The two-step method involves first preparing fine-grained powder particles, and then pressing and sintering particles of different sizes to obtain a bulk mixed-crystal copper alloy, such as spark plasma sintering and hot pressing sintering. Both of these methods result in copper alloys being relatively prone to oxidation during the preparation of mixed-crystal copper alloy structural materials, leading to high preparation costs, significant influence from microscopic segregation and impurities, and producing mixed-crystal copper alloys with large grains and uneven microstructure.

[0004] Therefore, finding a suitable process to prepare mixed-crystal copper alloys is key to further improving their performance. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a high-strength and ductile mixed-crystal copper alloy, so as to solve the problems of large grain size and uneven microstructure in mixed-crystal copper alloys in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for preparing a high-strength, high-ductility mixed-crystal copper alloy includes the following steps:

[0008] Step 1: Heat the copper alloy to a molten state in two crucibles;

[0009] Step 2: Add alumina powder to one of the crucibles;

[0010] Step 3: The molten copper alloy in the crucible is transferred to the funnel of the spray forming equipment, so that the alloy flows into the atomizing device; high-pressure inert gas atomization and low-pressure inert gas atomization processes are used respectively to form a solid-liquid two-phase particle jet flow through dual-flow atomization.

[0011] Step 4: The jet stream is sprayed onto the substrate and cooled to form a copper alloy billet;

[0012] Step 5: Perform post-processing according to the copper alloy element ratio.

[0013] As a further aspect of the present invention, in step 1, the heating method is to use an induction melting furnace for heating.

[0014] As a further aspect of the present invention, in step 2, the amount of alumina powder added to the crucible is 0.1%-1.5% of the amount of copper alloy in the crucible.

[0015] As a further embodiment of the present invention, in step 3, the inert gas is nitrogen.

[0016] As a further embodiment of the present invention, in step 3, the two crucibles are respectively connected to the funnel of the spray molding equipment, and the funnel is respectively equipped with a spray plate. One spray plate is used to input high-pressure inert gas, and the other spray plate is used to input low-pressure inert gas. The pressure of the high-pressure inert gas is 12-15 MPa, and the pressure of the low-pressure inert gas is 1-2 MPa.

[0017] As a further aspect of the present invention, the weight ratio of molten copper alloy atomized by high-pressure inert gas to molten copper alloy atomized by low-pressure inert gas is 1-2:1.

[0018] As a further aspect of the present invention, alumina powder is added to molten copper alloy atomized by high-pressure inert gas to prevent the recrystallization and growth of fine grains, while coarse grains may recrystallize and grow, thus making the mixed crystal structure more stable.

[0019] As a further embodiment of the present invention, the spray disc employs V-shaped or conical spraying.

[0020] As a further aspect of the present invention, in step 4, the jet stream is sprayed onto the preheated substrate under the action of atomized gas to form a rapidly solidified deposition layer; then, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is gradually densified to finally form a high-density copper alloy billet.

[0021] As a further aspect of the present invention, in step 5, the post-treatment for preparing the mixed-crystal copper-nickel-silicon alloy includes hot rolling, solution treatment, cold rolling, and aging treatment in sequence.

[0022] As a further aspect of the present invention, in step 5, for the preparation of mixed-crystal copper-zinc-manganese-silicon-nickel (brass) alloy, the post-processing includes homogenization, hot rolling, and cold rolling in sequence.

[0023] As a further aspect of the present invention, in step 5, the post-treatment for preparing mixed-crystal copper-chromium-zirconium alloy includes hot rolling, solution treatment, and aging treatment in sequence.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. This invention provides a method for preparing a high-strength, high-ductility mixed-crystal copper alloy. The mixed-crystal copper alloy billet is prepared using a dual-flow simultaneous atomization method, requiring only one processing step to obtain the semi-finished mixed-crystal copper alloy, significantly reducing production costs. Furthermore, due to the high-pressure gas, the microstructure formed by the deposition of atomized copper alloy droplets is finer and more uniform, suppressing the influence of microscopic segregation and impurities. This reduces the possibility of oxidation of the mixed-crystal copper alloy during the multi-stage preparation process, further lowering production costs. Because the solidification rate of the copper alloy is significantly increased during the dual-flow atomization process, the prepared mixed-crystal copper alloy has finer grains and a more uniform microstructure, and it can suppress both macroscopic and microscopic segregation in the mixed-crystal copper alloy, which is beneficial for obtaining better performance. During atomization, the powder particle size is usually small, which helps to refine the grains during the preparation of mixed-crystal copper alloys. Fine grains can effectively hinder the movement of dislocations, thereby improving the strength and toughness of copper alloys. It can also achieve a uniform distribution of the internal structure of copper alloys, which is very beneficial for maintaining the mixed-crystal structure. The uniform structure can reduce stress concentration inside the material, improve the overall performance of copper alloys, and affect the phase transformation process of copper alloys, thereby helping to maintain the mixed-crystal structure. It has good thermal stability, which helps to maintain the mixed-crystal structure in high-temperature applications.

[0026] 2. The mixed-crystal copper alloy prepared by the present invention has excellent plasticity and strength, which can effectively solve the contradiction that plasticity and strength cannot be improved at the same time in copper alloys, and has broad application prospects. Attached Figure Description

[0027] The present invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the preparation of high-strength, ductile mixed-crystal copper alloy using the dual-flow atomization process of this invention;

[0029] Figure 2 This is a TEM image of the mixed crystal copper alloy billet after dual-flow atomization spraying in the preparation of high-strength and ductile mixed crystal copper alloy according to Embodiment 1 of the present invention.

[0030] Figure 3 This is a TEM image of the mixed crystal copper alloy billet after dual-flow atomization spraying in the preparation of high-strength and ductile mixed crystal copper alloy according to Embodiment 2 of the present invention.

[0031] Figure 4 This is a TEM image of the mixed crystal copper alloy billet after dual-flow atomization spraying in the preparation of high-strength and ductile mixed crystal copper alloy in Embodiment 3 of the present invention.

[0032] Figure 5 This is a schematic diagram showing the specific dimensions of a uniaxial tensile specimen. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] Please see Figure 1 A method for preparing a high-strength, high-ductility mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) includes the following steps:

[0036] Step 1: Connect two crucibles to the funnels of the spray forming equipment. Each funnel is equipped with a spray plate. One spray plate is supplied with high-pressure nitrogen, and the other spray plate is supplied with low-pressure nitrogen. Divide the copper alloy into two parts at a weight ratio of 1:1.5. Add 1 part by weight of copper alloy to the crucible connected to the low-pressure nitrogen side, and add 1.5 parts by weight of copper alloy to the crucible connected to the high-pressure nitrogen side. Heat them separately in an induction melting furnace until they are molten.

[0037] Step 2: Add 0.8% alumina powder to the crucible connected to the high-pressure nitrogen side;

[0038] Step 3: Molten copper alloy flows into the atomization device and is atomized by low-pressure nitrogen atomization at 1.5 MPa and high-pressure nitrogen atomization at 12 MPa respectively, forming a micro-droplet jet of solid-liquid two-phase particles through dual-flow atomization.

[0039] Step 4: The dual-flow atomized jet is sprayed onto the preheated substrate to form a rapidly solidified deposition layer. Subsequently, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is densified layer by layer, ultimately forming a high-density mixed-crystal copper alloy billet. The transmission electron microscope (TEM) image is shown below. Figure 2 As shown;

[0040] Step 5: The billet is subjected to hot rolling, solution treatment, cold rolling and aging treatment in sequence.

[0041] Example 2

[0042] Please see Figure 1 A method for preparing a high-strength, high-ductility mixed-crystal copper alloy (Cu-34Zn-1.3Mn-0.5Si-0.6Ni alloy) includes the following steps:

[0043] Step 1: Connect two crucibles to the funnels of the spray forming equipment. Each funnel is equipped with a spray plate. One spray plate is supplied with high-pressure nitrogen, and the other spray plate is supplied with low-pressure nitrogen. Divide the copper alloy into two parts at a weight ratio of 1:1.5. Add 1 part by weight of copper alloy to the crucible connected to the low-pressure nitrogen side, and add 1.5 parts by weight of copper alloy to the crucible connected to the high-pressure nitrogen side. Heat them separately in an induction melting furnace until they are molten.

[0044] Step 2: Add 0.8% alumina powder to the crucible connected to the high-pressure nitrogen side;

[0045] Step 3: Molten copper alloy flows into the atomization device and is atomized by low-pressure nitrogen atomization at 1.5 MPa and high-pressure nitrogen atomization at 12 MPa respectively, forming a micro-droplet jet of solid-liquid two-phase particles through dual-flow atomization.

[0046] Step 4: The jet stream is sprayed onto the preheated substrate, forming a rapidly solidified deposition layer. Subsequently, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is densified layer by layer, ultimately forming a high-density mixed-crystal copper alloy billet. TEM image as shown. Figure 3 As shown;

[0047] Step 5: The billet is subjected to homogenization, hot rolling and cold rolling in sequence.

[0048] Example 3

[0049] Please see Figure 1 A method for preparing a high-strength, high-ductility mixed-crystal copper alloy (Cu-0.8Cr-0.16Zr alloy) includes the following steps:

[0050] Step 1: Connect two crucibles to the funnels of the spray forming equipment. Each funnel is equipped with a spray plate. One spray plate is supplied with high-pressure nitrogen, and the other spray plate is supplied with low-pressure nitrogen. Divide the copper alloy into two parts at a weight ratio of 1:1.5. Add 1 part by weight of copper alloy to the crucible connected to the low-pressure nitrogen side, and add 1.5 parts by weight of copper alloy to the crucible connected to the high-pressure nitrogen side. Heat them separately in an induction melting furnace until they are molten.

[0051] Step 2: Add 0.8% alumina powder to the crucible connected to the high-pressure nitrogen side;

[0052] Step 3: Molten copper alloy flows into the atomization device and is atomized by low-pressure nitrogen atomization at 1.5 MPa and high-pressure nitrogen atomization at 12 MPa respectively, forming a micro-droplet jet of solid-liquid two-phase particles through dual-flow atomization.

[0053] Step 4: The jet stream is sprayed onto the preheated substrate, forming a rapidly solidified deposition layer. Subsequently, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is densified layer by layer, ultimately forming a high-density mixed-crystal copper alloy billet. TEM image as shown. Figure 4 As shown;

[0054] Step 5: The billet is subjected to hot rolling, solution treatment and aging treatment in sequence.

[0055] Example 4

[0056] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the weight ratio of copper alloy in the crucible connected to the low-pressure nitrogen side and the crucible connected to the high-pressure nitrogen side is 1:1, while the remaining steps and parameters remain the same.

[0057] Example 5

[0058] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the weight ratio of copper alloy in the crucible connected to the low-pressure nitrogen side and the crucible connected to the high-pressure nitrogen side is 1:2, while the remaining steps and parameters remain the same.

[0059] Example 6

[0060] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the proportion of alumina powder added to the crucible connected to the high-pressure nitrogen side is 0.2%, while the remaining steps and parameters remain the same.

[0061] Example 7

[0062] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the proportion of alumina powder added to the crucible connected to the high-pressure nitrogen side is 1.5%, while the remaining steps and parameters remain the same.

[0063] Example 8

[0064] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the high-pressure inert gas pressure is 15MPa and the low-pressure inert gas pressure is 1MPa, while the remaining steps and parameters remain the same.

[0065] Example 9

[0066] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the high-pressure inert gas pressure is 13MPa and the low-pressure inert gas pressure is 2MPa, while the remaining steps and parameters remain the same.

[0067] Comparative Example 1

[0068] The copper alloy (Cu-2.1Ni-0.9Si alloy) is prepared using a conventional melting and casting process, specifically including the following steps: In a vacuum furnace, the proportioned copper-nickel-silicon blocks are heated to 1000℃. After the copper-nickel-silicon blocks melt, they are naturally cooled to room temperature (25-30℃) to obtain the final product.

[0069] Comparative Example 2

[0070] Please see Figure 1 A method for preparing a mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the nitrogen pressure input to both spray discs is set to 12 MPa, while the remaining steps and parameters remain the same; specifically, it includes the following steps:

[0071] Step 1: Connect the two crucibles to the funnels of the spray forming equipment, and set the spray plates on the funnels. Nitrogen gas is introduced into both spray plates. Divide the copper alloy into two portions at a weight ratio of 1:1.5, put them into the crucibles, and heat them to the molten state in an induction melting furnace.

[0072] Step 2: Add 0.8% alumina powder to a crucible containing 1.5 parts by weight;

[0073] Step 3: Molten copper alloy flows into the atomization device and is atomized by a high-pressure nitrogen atomization process of 12MPa to form a micro-droplet jet of solid-liquid two-phase particles.

[0074] Step 4: The jet stream is sprayed onto the preheated substrate to form a rapidly solidified deposition layer; then, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is gradually densified to obtain a copper alloy billet.

[0075] Step 5: The billet is subjected to hot rolling, solution treatment, cold rolling and aging treatment in sequence.

[0076] Comparative Example 3

[0077] Please see Figure 1 A method for preparing a mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that the nitrogen pressure input to both spray discs is set to 1.5 MPa, while the remaining steps and parameters remain the same; specifically, it includes the following steps:

[0078] Step 1: Connect the two crucibles to the funnels of the spray forming equipment, and set the spray plates on the funnels. Nitrogen gas is introduced into both spray plates. Divide the copper alloy into two portions at a weight ratio of 1:1.5, put them into the crucibles, and heat them to the molten state in an induction melting furnace.

[0079] Step 2: Add 0.8% alumina powder to a crucible containing 1.5 parts by weight;

[0080] Step 3: Molten copper alloy flows into the atomization device and is atomized by a low-pressure nitrogen gas atomization process of 1.5MPa to form a micro-droplet jet of solid-liquid two-phase particles.

[0081] Step 4: The jet stream is sprayed onto the preheated substrate to form a rapidly solidified deposition layer; then, by controlling the substrate temperature and cooling rate, combined with the dynamic compaction effect during the deposition process, the deposition layer is gradually densified to obtain a copper alloy billet.

[0082] Step 5: The billet is subjected to hot rolling, solution treatment, cold rolling and aging treatment in sequence.

[0083] Comparative Example 4

[0084] Please see Figure 1 A method for preparing a high-strength and ductile mixed-crystal copper alloy (Cu-2.1Ni-0.9Si alloy) differs from Example 1 in that alumina powder is not added to the crucible connected to the high-pressure nitrogen side, while the remaining steps and parameters remain the same.

[0085] The parameters in the above embodiments and comparative examples are summarized in Table 1.

[0086] Table 1

[0087]

[0088] The copper alloy billets prepared in Examples 1-9 and Comparative Examples 1-4 were subjected to tensile tests at room temperature. The tensile testing machine was an AG-100KNXp l us type electronic universal testing machine. Tensile specimens were prepared using an electrical discharge wire cutting machine. The specific dimensions of the uniaxial tensile specimens are as follows: Figure 5 As shown, the gauge length is 12 mm and the working area width is 4 mm. The surface and sides of the tensile specimen are polished with sandpaper until they are smooth and shiny. The tensile loading speed is 1 mm / min. The tensile strength and elongation can be obtained. The test results are shown in Table 2.

[0089] Table 2

[0090] Tensile strength / MPa elongation Example 1 800 12％ Example 2 660 18％ Example 3 720 16％ Example 4 780 11.8％ Example 5 790 11.6％ Example 6 786 11.8％ Example 7 797 12.3％ Example 8 807 11.7％ Example 9 798 12.4％ Comparative Example 1 300 8％ Comparative Example 2 456 7.8％ Comparative Example 3 347 8.7％ Comparative Example 4 725 10.6％

[0091] As shown in Table 2, compared with Example 1 and Comparative Example 1, the tensile strength and elongation of the copper-nickel-silicon alloy prepared by conventional methods are far inferior to those of the mixed-crystal copper-nickel-silicon alloy prepared by the dual-flow atomization process of the present invention. In both Example 1 and Comparative Example 2, high-pressure atomization in both flows resulted in excessively fine grains, leading to fine grain recrystallization and growth. In both Example 1 and Comparative Example 2, low-pressure atomization in both flows resulted in larger alloy grains generated by gas atomization, leading to poor density of the copper alloy billet. In both Example 1 and Comparative Example 4, when alumina powder is not added to the high-pressure end copper alloy, fine grain recrystallization and growth into coarse grains may occur, and these coarse grains may further crystallize and grow, resulting in an unstable mixed-crystal structure. Therefore, by using the process of the present invention, the prepared mixed-crystal copper alloy has finer grains and a more uniform microstructure, and can suppress macroscopic and microscopic segregation in the mixed-crystal copper alloy, effectively improving both the strength and plasticity of the copper-nickel-silicon alloy.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-strength, high-ductility mixed-crystal copper alloy, characterized in that, Includes the following steps: Step 1: Heat the copper alloy to a molten state in two crucibles; Step 2: Add alumina powder to one of the crucibles; Step 3: The molten copper alloy in the crucible is transferred to the funnel of the spray forming equipment, allowing the alloy to flow into the atomizing device; high-pressure inert gas atomization and low-pressure inert gas atomization processes are used respectively to form a solid-liquid two-phase particle jet flow; the two crucibles are respectively connected to the funnel of the spray forming equipment, and the funnel is equipped with a spray plate. One spray plate is supplied with high-pressure inert gas, and the other spray plate is supplied with low-pressure inert gas. The pressure of the high-pressure inert gas is 12-15MPa, and the pressure of the low-pressure inert gas is 1-2MPa; Step 4: The jet stream is sprayed onto the substrate and cooled to form a copper alloy billet; Step 5: Perform post-processing according to the copper alloy element ratio; In this process, alumina powder is added to molten copper alloy that is atomized using high-pressure inert gas.

2. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 1, the heating method is to use an induction melting furnace.

3. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 2, the amount of alumina powder added to the crucible is 0.1%-1.5% of the amount of copper alloy in the crucible.

4. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 3, the inert gas is nitrogen.

5. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 3, the weight ratio of molten copper alloy atomized by high-pressure inert gas to molten copper alloy atomized by low-pressure inert gas is 1-2:

1.

6. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 5, for the preparation of mixed-crystal copper-nickel-silicon alloy, the post-treatment includes hot rolling, solution treatment, cold rolling, and aging treatment in sequence.

7. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 5, for the preparation of mixed-crystal copper-zinc-manganese-silicon-nickel alloy, the post-processing includes homogenization, hot rolling, and cold rolling.

8. The method for preparing a high-strength, ductile mixed-crystal copper alloy according to claim 1, characterized in that, In step 5, for the preparation of mixed-crystal copper-chromium-zirconium alloy, the post-treatment includes hot rolling, solution treatment, and aging treatment in sequence.

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