Heterogeneous CuNiCoCr-based multi-component alloy with high toughness and corrosion resistance and preparation method of heterogeneous CuNiCoCr-based multi-component alloy

Abstract

The invention discloses a high-toughness and corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy and a preparation method thereof, and belongs to the technical field of copper alloys for extreme working conditions. The alloy comprises the following components in percentage by atomic concentration: 44.00 to 50.00 at.% of a Cu element, 17.00 to 20.00 at.% of an Ni element, 17.00 to 20.00 at.% of a Co element, 7.00 to 10.00 at.% of a Cr element, 0 to 8.00 at.% of an Al element, and 0 to 3.00 at.% of a Ti element. Through simple smelting and casting, cold rolling and high-temperature short-time normalizing processes, the organization structure of the alloy can be regulated and controlled, and the prepared heterogeneous CuNiCoCr-based multi-component alloy has high strength, toughness and corrosion resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of copper alloys for extreme working conditions, and in particular relates to a high-toughness, corrosion-resistant, heterogeneous CuNiCoCr-based multi-component alloy and a preparation method thereof. Background Art

[0002] High-performance materials are the basic guarantee for innovation in marine engineering technology and equipment, and determine the high efficiency, reliability and long-lasting performance of mechanical equipment. The marine service environment is complex and harsh, and must withstand different environmental loads such as wind, fluid dynamics, waves, currents, ice, earthquakes, etc., and also face corrosion caused by seawater media. Therefore, the research and development of high-strength, tough, and corrosion-resistant structural materials is of great significance to improving marine engineering technology, equipment reliability, and vigorously promoting innovation in marine science and technology.

[0003] Nickel aluminum bronze has the advantages of high strength, good fracture toughness, resistance to seawater cavitation and seawater corrosion, and is widely used in propellers or valve materials. The most representative alloy is Cu 69.77 Al 20.54 Fe 4.96 Ni 4.72 (at.%) alloy (C63000), the ultimate tensile strength, yield strength and elongation are 758MPa, 468MPa and 10% respectively. The microstructure of this type of alloy is very complex, including α phase (face-centered cubic structure copper-based solid solution), β phase (based on Cu 3 Al or Cu 2 MnAl body-centered cubic structure) and K phase (Fe and Mn-rich phase). The K phase is divided into 4 different types of Fe-rich intermetallic compound phases. Ⅰ It is a rose-shaped precipitate phase with a diameter of 5-10μm; K Ⅱ It is a small dendritic rosette phase, mainly distributed at the α / β phase boundary, with a diameter ranging from 1-2μm; K Ⅲ It is a fine lamellar eutectoid structure; K Ⅳ The phase is a fine precipitate phase with the highest iron content among the intermetallic compounds. They are of different sizes (diameter < 0.5 μm) and are dispersed in the α phase. The complexity of the alloy's microstructure has brought great difficulties to the organization control of the alloy, and it is difficult to ensure the stability of mechanical properties and corrosion resistance. With the improvement of marine engineering equipment technology, higher performance requirements are placed on propeller or valve materials. It is urgent to develop new high-strength, tough, and corrosion-resistant copper alloy structural materials to meet industrial needs. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy and a preparation method thereof. The design concept is to increase the configuration entropy of the material by adding alloying elements, thereby obtaining a stable solid solution structure. This type of alloy has a wide range of performance control and is easy to achieve performance tailoring.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] One of the purposes of the present invention is to provide a high-strength, tough, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy, comprising the following components: 44.00-50.00 at.%, Cu element 17.00-20.00 at.%, Co element 17.00-20.00 at.%, Cr element 7.00-10.00 at.%, Al element 0-8.00 at.% and Ti element 0-3.00 at.%.

[0007] The present invention develops a CuNiCoCr-based alloy, and the same FCC crystal structure avoids electrochemical corrosion caused by the large potential difference between the matrix phase and the precipitated phase. Cr element can be used as a dense Cr 2 O 3 The elemental origin of the passivation layer is related to Cu 2 The O layer forms a double corrosion-resistant passivation layer structure, which ensures the stability of the alloy's corrosion resistance. The heterogeneous microstructure provides soft and hard areas, provides a source of back stress, and ensures the alloy's work hardening ability. Al and Ti elements can adjust the type and distribution of precipitation phases, which is beneficial to regulating the high strength, toughness and corrosion resistance of the alloy in a wide range. The Ni element can form a solid solution with the Cu element, and can form a precipitation phase of the solid solution in the lattice, thereby improving the strength and hardness of the alloy, and can also improve the oxidation resistance and corrosion resistance of the alloy. The Co element can form a solid solution with the Ni and Cr elements, and form a precipitation phase of the solid solution in the lattice, thereby improving the oxidation resistance and corrosion resistance of the alloy.

[0008] Preferably, the heterogeneous CuNiCoCr-based multi-component alloy comprises the following components: 45.00 at.%, Cu element, 18.00 at.%, Ni element, 18.00 at.%, Co element, 9.00 at.%, Cr element, 7.50 at.%, Al element and 2.50 at.%.

[0009] Preferably, the heterogeneous CuNiCoCr-based multi-component alloy comprises the following components: 50.00 at. % Cu element, 20.00 at. % Ni element, 20.00 at. % Co element and 10.00 at. % Cr element.

[0010] The second object of the present invention is to provide a method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy, comprising the following steps:

[0011] According to atomic percentage, raw materials Cu, Ni, Co, Cr, Al and Ti are proportioned to obtain a mixed material;

[0012] Under argon protection, the mixed material is repeatedly melted by non-consumable vacuum arc melting to obtain an alloy ingot;

[0013] The alloy ingot is homogenized and cold rolled to obtain a cold-rolled alloy;

[0014] The cold-rolled alloy is subjected to normalizing treatment to obtain a heterogeneous CuNiCoCr-based multi-component alloy.

[0015] The present invention controls the microstructure of the alloy by simple melting casting, cold rolling and high temperature short-time normalizing process. The CuNiCoCr-based multi-component alloy shows obvious heterogeneous structure and retains the cast dendrite structure, in which the dendrite boundary is Cu-rich FCC 1 phase, while the dendrite trunk is Cu-poor FCC 2 Phase; Cu-rich FCC 1 There is a high density of FCC on the phase 2 Phase precipitation. It is manifested in two scales: 10-100nm (intracrystalline) and 0.5-2μm. After adding Al and Ti elements, nano-spherical L12 phase precipitates on the Cu-rich FCC1 phase with a size of 10-20nm.

[0016] Furthermore, the repeated smelting is performed 5 times.

[0017] Furthermore, the specific operation of the homogenization treatment includes: placing the alloy ingot at 1070-1100° C. for 24 hours.

[0018] Furthermore, the cold rolling refers to cold rolling the alloy ingot after homogenization treatment to a deformation amount of 90%.

[0019] Furthermore, the specific operation of the normalizing treatment includes: placing the cold-rolled alloy at 1000° C. for 45 minutes.

[0020] Furthermore, the grain size of the inhomogeneous CuNiCoCr-based multi-component alloy is 2-5 μm.

[0021] The third object of the present invention is to provide a high-strength, tough, and corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy for use in the field of marine engineering equipment.

[0022] A fourth object of the present invention is to provide a high-strength, tough, and corrosion-resistant inhomogeneous CuNiCoCr-based multi-component alloy for use in the preparation of propeller or valve materials.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The present invention reasonably regulates the enthalpy interaction of the CuNiCoCr-based alloy, so that a simple FCC phase structure is obtained under complex alloy composition conditions; further, through thermomechanical processing technology regulation, a heterogeneous structure of the alloy is achieved, which is conducive to the tailoring of alloy properties.

[0025] The heterogeneous CuNiCoCr-based multi-component alloy prepared by the present invention has both high strength and toughness and corrosion resistance. The performance indicators of the alloy are: yield strength 620-1100MPa, ultimate tensile strength 787-1250MPa, maximum elongation 9-36%, self-corrosion potential 205-220mV, corrosion current density 1.10-1.90μA / cm 2 . It breaks through the bottleneck of the trade-off between strength, plasticity and corrosion resistance of traditional Cu alloys and has great application potential in the fields of petrochemicals, aerospace and marine engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) XRD diffraction pattern of the alloy;

[0028] Figure 2 The Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) XRD diffraction pattern of the alloy;

[0029] Figure 3 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) SEM secondary electron image and selected area electron diffraction pattern of the alloy;

[0030] Figure 4 The Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) SEM secondary electron image and selected area electron diffraction pattern of the alloy;

[0031] Figure 5 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) alloy and Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) engineering stress-strain curve of the alloy;

[0032] Figure 6 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) alloy and Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) Potentiodynamic polarization curve of the alloy;

[0033] Figure 7 Cu in Comparative Example 1 69.77 Al 20.54 Fe 4.96 Ni 4.72 (at.%) potentiodynamic polarization curve. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0035] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0036] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0037] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0038] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0039] The present invention proposes a series of heterogeneous CuNiCoCr-based multi-component alloys, which have simple phase structure, convenient organization control and high stability. More importantly, the three aspects of tensile strength, plasticity and corrosion resistance are matched. The phase structure of CuNiCoCr alloy is FCC 1 +FCC 2 , with tensile strength exceeding 1GPa, elongation of ~10% and excellent corrosion resistance. By further adding Al and Ti elements, the alloy phase structure is transformed into FCC 1 +FCC 2 +L1 2 , showing a tensile strength of 780MPa, an elongation of ~36% and excellent corrosion resistance. The heterogeneous CuNiCoCr-based multi-component alloy with excellent comprehensive performance, convenient organization control and high stability provides a new choice for the selection of marine equipment and components.

[0040] The present invention provides a method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy, comprising the following steps:

[0041] (1) According to atomic percentage, raw materials Cu, Ni, Co, Cr, Al and Ti are proportioned to obtain a mixed material;

[0042] (2) repeatedly melting the mixture by non-consumable vacuum arc melting under argon protection to obtain an alloy ingot with uniform composition;

[0043] (3) homogenizing the alloy ingot and cold rolling it to obtain a cold-rolled alloy;

[0044] (4) normalizing the cold-rolled alloy to obtain a heterogeneous CuNiCoCr-based multi-component alloy.

[0045] In the following embodiments of the present invention, the number of repeated smelting in step (2) is 5 times. During smelting, the current is controlled between 220-320A. The present invention does not discuss the influence of specific current parameters on product performance. In the present invention, as long as the purpose of uniform composition can be achieved, the parameters are not specifically limited in the following embodiments of the present invention.

[0046] In some embodiments of the present invention, the specific operation of the homogenization treatment in step (3) includes: placing the alloy ingot at 1070-1100° C. for 24 hours. Exemplarily, in the following embodiments of the present invention, the temperature of the homogenization treatment can be selected to be 1100° C.

[0047] In the following embodiments of the present invention, the cold rolling in step (3) refers to cold rolling the alloy ingot after homogenization treatment to a deformation amount of 90%.

[0048] In the following embodiments of the present invention, the specific operation of the normalizing treatment in step (4) includes: placing the cold-rolled alloy at 1000° C. for 45 minutes.

[0049] The heterogeneous CuNiCoCr-based multi-component alloy prepared by the above preparation method includes the following components: 44.00-50.00 at.%, Cu element 17.00-20.00 at.%, Co element 17.00-20.00 at.%, Cr element 7.00-10.00 at.%, Al element 0-8.00 at.% and Ti element 0-3.00 at.%.

[0050] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 45.00 at.%, 50 at.%, or any range or sub-range between the aforementioned ratios of Cu element.

[0051] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 18.00 at.%, 20 at.%, or any range or sub-range between the aforementioned ratios of Ni element.

[0052] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 18.00 at.%, 20 at.%, or any range or sub-range between the aforementioned ratios of Co element.

[0053] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 9.00 at.%, 10 at.%, or any range or sub-range between the aforementioned ratios of Cr element.

[0054] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 0 at.%, 7.50 at.%, or any range or sub-range between the aforementioned ratios of Al element.

[0055] Illustratively, in the following embodiments of the present invention, the heterogeneous CuNiCoCr-based multi-component alloy includes 0 at.%, 2.50 at.%, or any range or sub-range between the aforementioned ratios.

[0056] As an embodiment, the present invention provides a heterogeneous CuNiCoCr-based multi-component alloy, which includes the following components in terms of atomic percentage concentration: 44.00-46.00 at.%, 17.00-19.00 at.%, 17.00-19.00 at.%, 17.00-19.00 at.%, 7.00-9.00 at.%, 7.00-8.00 at.%, and 2.00-3.00 at.%. Exemplarily, the heterogeneous CuNiCoCr-based multi-component alloy includes the following components in terms of atomic percentage concentration: 45.00 at.%, 18.00 at.%, 18.00 at.%, 9.00 at.%, 7.50 at.%, and 2.50 at.% of Cu element.

[0057] As another embodiment, the present invention provides a heterogeneous CuNiCoCr-based multi-component alloy, comprising the following components: 44.00-50.00 at.%, 17.00-20.00 at.%, 17.00-20.00 at.%, and 7.00-10.00 at.%. Exemplarily, the heterogeneous CuNiCoCr-based multi-component alloy comprises the following components: 50.00 at.%, 20.00 at.%, 20.00 at.%, and 10.00 at.% of Cu element.

[0058] Explanation of terms involved in the present invention:

[0059] Back stress: refers to a shear stress inside a material, which is generated along the cross-section of the material. Back stress will be generated when there are different strain states inside the material. The magnitude of back stress depends on the nature of the material, its geometry and the applied force.

[0060] Normalizing: It is a heat treatment process that heats the alloy material to above the critical temperature, keeps it warm for a period of time, and then cools it in air to obtain a pearlite-like structure. The purpose of normalizing is to improve the mechanical properties and processing properties of the material.

[0061] The pure metals used in the present invention are all purchased from the market.

[0062] The technical solution of the present invention is further illustrated by the following embodiments.

[0063] Example 1

[0064] A Cu 50 Ni 20 Co 20 Cr 10 A method for preparing an alloy having an at.% alloy content of 1.175 g / cm2 comprises the following steps:

[0065] (1) preparing raw materials according to the following ratios: 50.00 at. % of Cu element, 20.00 at. % of Ni element, 20.00 at. % of Co element and 10.00 at. % of Cr element to obtain a mixed material;

[0066] (2) placing the mixed material into a non-consumable vacuum arc melting furnace, introducing high-purity argon gas, and repeatedly melting for 5 times at a current of 220-320A to obtain an alloy ingot with uniform composition;

[0067] (3) keeping the alloy ingot at 1100° C. for 24 hours for homogenization treatment, and then cold rolling to obtain a cold-rolled alloy with a deformation amount of 90%;

[0068] (4) The cold-rolled alloy is normalized at 1000° C. for 45 minutes to obtain Cu 50 Ni 20 Co 20 Cr 10 (at.%) alloy.

[0069] Example 2

[0070] A method for preparing a high-toughness, corrosion-resistant, heterogeneous CuNiCoCr-based multi-component alloy comprises the following steps:

[0071] (1) preparing raw materials according to the following ratios: 45.00 at. % of Cu element, 18.00 at. % of Ni element, 18.00 at. % of Co element, 9.00 at. % of Cr element, 7.50 at. % of Al element and 2.50 at. % of Ti element to obtain a mixed material;

[0072] (2) placing the mixed material into a non-consumable vacuum arc melting furnace, introducing high-purity argon gas, and repeatedly melting for 5 times at a current of 220-320A to obtain an alloy ingot with uniform composition;

[0073] (3) keeping the alloy ingot at 1100° C. for 24 hours for homogenization treatment, and then cold rolling to obtain a cold-rolled alloy with a deformation amount of 90%;

[0074] (4) The cold-rolled alloy was normalized at 1000° C. for 45 minutes to obtain a heterogeneous CuNiCoCr-based multi-component alloy, denoted as Cu 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) alloy.

[0075] The alloys prepared in Example 1 and Example 2 were subjected to X-ray diffraction analysis using a German Bruker D8 FOCUS X-ray diffractometer.

[0076] Figure 1 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) XRD diffraction pattern of the alloy. Figure 1 It can be seen that the alloy consists of FCC1 and FCC2 phases.

[0077] Figure 2 The Cu prepared in Example 2 45 Ni 18 Co 18Cr 9 Al 7.5 Ti 2.5 (at.%) XRD diffraction pattern of the alloy. Figure 2 It can be seen that the alloy is made of FCC 1 、FCC 2 Phase and L1 2 Phase composition.

[0078] Figure 3 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) SEM secondary electron image and selected area electron diffraction pattern of the alloy. Figure 1 It can be seen that the alloy is composed of Cu-rich FCC 1 and Cu-depleted FCC 2 Phase composition, and FCC 1 There is a high density of FCC on the phase 2 Phase precipitation. It is manifested in two scales: 10-100nm (intracrystalline) and 0.5-1μm.

[0079] Figure 4 The Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) SEM secondary electron image and selected area electron diffraction pattern of the alloy. Figure 2 It can be seen that the alloy is composed of Cu-rich FCC 1 , Cu-poor FCC 2 Phase composition and Cu-rich FCC 1 L1 precipitated in the phase 2 Phase, where L1 2 The phase size is 10-20 nm.

[0080] Figure 5 The Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 (at.%) alloy and Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) engineering stress-strain curve of the alloy, Figure 6 The Cu prepared in Example 1 50Ni 20 Co 20 Cr 10 (at.%) alloy and Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 (at.%) alloy potentiodynamic polarization curve. Figure 5 and Figure 6 It can be seen that the Cu prepared in Example 1 50 Ni 20 Co 20 Cr 10 The yield strength of the alloy is 1100MPa, the ultimate tensile strength is 1250MPa, the maximum elongation is 9%, the self-corrosion potential is 205mV, and the corrosion current density is 1.10μA / cm 2 ; Cu prepared in Example 2 45 Ni 18 Co 18 Cr 9 Al 7.5 Ti 2.5 The yield strength of the alloy is 620MPa, the ultimate tensile strength is 787MPa, the maximum elongation is 36%, the self-corrosion potential is 220mV, and the corrosion current density is 1.90μA / cm 2 .

[0081] Comparative Example 1

[0082] Cu 69.77 Al 20.54 Fe 4.96 Ni 4.72 (at.%) grade alloy (C63000) was purchased from Yehan Industrial (Shanghai) Co., Ltd.

[0083] The alloy was subjected to the same performance test as in Example 1. Figure 7 Cu in Comparative Example 1 69.77 Al 20.54 Fe 4.96 Ni 4.72 The results show that the yield strength is 400MPa, the ultimate tensile strength is 710MPa, the maximum elongation is 18%, the self-corrosion potential is 230mV, and the corrosion current density is 6.2μA / cm 2 .

[0084] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-toughness, corrosion-resistant, heterogeneous CuNiCoCr-based multi-component alloy, characterized in that: The invention comprises the following components: 44.00-50.00 at. % of Cu element, 17.00-20.00 at. % of Ni element, 17.00-20.00 at. % of Co element, 7.00-10.00 at. % of Cr element, 0-8.00 at. % of Al element and 0-3.00 at. % of Ti element.

2. The high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 1, characterized in that: The heterogeneous CuNiCoCr-based multi-component alloy includes the following components: 45.00 at. % of Cu element, 18.00 at. % of Ni element, 18.00 at. % of Co element, 9.00 at. % of Cr element, 7.50 at. % of Al element and 2.50 at. % of Ti element.

3. The high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 1, characterized in that: The heterogeneous CuNiCoCr-based multi-component alloy includes the following components: 50.00 at. % of Cu element, 20.00 at. % of Ni element, 20.00 at. % of Co element and 10.00 at. % of Cr element.

4. A method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to any one of claims 1 to 3, characterized in that: The following steps are involved: According to atomic percentage, raw materials Cu, Ni, Co, Cr, Al and Ti are proportioned to obtain a mixed material; Under argon protection, the mixed material is repeatedly melted by non-consumable vacuum arc melting to obtain an alloy ingot; The alloy ingot is homogenized and cold rolled to obtain a cold-rolled alloy; The cold-rolled alloy is subjected to normalizing treatment to obtain a heterogeneous CuNiCoCr-based multi-component alloy.

5. The method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 4, characterized in that: The number of repeated smelting is 5 times.

6. The method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 4, characterized in that: The specific operation of the homogenization treatment includes: placing the alloy ingot at 1070-1100° C. and keeping it warm for 24 hours.

7. The method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 4, characterized in that: The cold rolling refers to cold rolling the alloy ingot after homogenization treatment to a deformation amount of 90%.

8. The method for preparing a high-toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to claim 4, characterized in that: The specific operation of the normalizing treatment includes: placing the cold-rolled alloy at 1000° C. and keeping it warm for 45 minutes.

9. Application of the high-strength, tough, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to any one of claims 1 to 3 in the field of marine engineering equipment.

10. Use of the high-strength, toughness, corrosion-resistant heterogeneous CuNiCoCr-based multi-component alloy according to any one of claims 1 to 3 in the preparation of propeller or valve materials.

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