A copper-containing eutectic high-entropy alloy and its preparation method and application

Abstract

The present invention provides a copper-containing eutectic high-entropy alloy, a preparation method thereof, and an application thereof. The chemical formula of the material of the high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 29 ≤ a ≤ 50 at.%, 10 ≤ b ≤ 18 at.%, 10 ≤ c ≤ 18 at.%, 10 ≤ d ≤ 18 at.%, 17 ≤ e ≤ 20 at.%, 2 ≤ f ≤ 10 at.%, and a + b + c + d + e + f = 100. The high-entropy alloy has a eutectic structure. The eutectic high-entropy alloy of the present invention is composed of a face-centered cubic phase and a body-centered cubic phase. The face-centered cubic phase provides plasticity, and the body-centered cubic phase provides strength, enabling the alloy to maintain good plasticity while achieving high strength. At the same time, due to the addition of copper element, the alloy has the ability to precipitate copper ions during the immersion process in 3.5 wt.% NaCl solution.

Description

Technical Field

[0001] The present invention relates to the technical field of metallic materials, and particularly to a copper-containing eutectic high-entropy alloy, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of fields such as aviation, aerospace, and shipbuilding, the demand for high-performance metallic materials is becoming increasingly urgent. Traditional metallic materials are often based on a single element as the main element, and the development of their performance has tended to reach a bottleneck. In recent years, high-entropy alloys have received extensive attention in the field of materials research due to their excellent mechanical properties and special functional characteristics. Although it is composed of multiple components, it still maintains a simple single-phase solid solution structure in the as-cast state. For example, a single-phase face-centered cubic solid solution structure and a single-phase body-centered cubic solid solution structure, etc. Generally, high-entropy alloys with a single-phase face-centered cubic solid solution structure exhibit good plasticity but low strength; while high-entropy alloys with a single-phase body-centered cubic solid solution structure have high strength but poor plasticity. In addition, high-entropy alloys also have problems of poor casting fluidity and serious composition segregation, which severely restrict the engineering application and development of high-entropy alloys.

[0003] In 2014, the prior art first proposed the concept of eutectic high-entropy alloys and designed and prepared the AlCoCrFeNi2.1 eutectic high-entropy alloy with good casting properties. This alloy is composed of an FCC solid solution and an L12 two-phase, and the two are distributed in a lamellar shape, having good comprehensive mechanical properties and casting properties, showing good engineering application prospects. Eutectic high-entropy alloys have good casting properties and relatively high strength, so they have great application potential as materials for large structural components in marine engineering fields such as ship propellers. However, for metallic materials serving in the marine environment, the important failure form of microbial corrosion must also be considered. In the marine environment, the rate of microbial corrosion is 1-2 orders of magnitude greater than that of abiotic corrosion. In seawater, copper alloys can slowly release copper ions with a certain toxicity, thereby eliminating marine organisms attached to the surface of components, reducing or even eliminating microbial corrosion, which is one of the reasons why copper alloys can become the most important marine structural metallic materials. In order to improve the anti-marine biofouling ability, adding copper elements to structural metallic materials is the main material design method. However, there are currently no research results on copper-containing eutectic high-entropy alloys.

[0004] Therefore, in order to promote the application of eutectic high-entropy alloys in the marine engineering field, it is necessary to study a copper-containing eutectic high-entropy alloy, a preparation method thereof, and an application thereof to address the deficiencies of the prior art and solve or mitigate one or more of the above problems. Summary of the Invention

[0005] In view of this, the present invention provides a copper-containing eutectic high-entropy alloy, its preparation method and application. Aiming at the problem that the current eutectic high-entropy alloy does not contain copper element with bactericidal function, through careful composition optimization design, a copper-containing eutectic high-entropy alloy, its preparation method and application are provided. The eutectic high-entropy alloy is composed of a face-centered cubic phase and a body-centered cubic phase. The face-centered cubic phase provides plasticity, and the body-centered cubic phase provides strength, enabling the alloy to maintain good plasticity while achieving high strength. At the same time, due to the addition of copper element, the alloy has the ability to precipitate copper ions during the immersion process in 3.5 wt.% NaCl solution.

[0006] On the one hand, the present invention provides a eutectic high-entropy alloy containing copper element. The high-entropy alloy is a Ni-Fe-Co-Cr-Al-Cu series copper-containing eutectic high-entropy alloy, and the chemical formula of the material of the high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 29 ≤ a ≤ 50 at.%, 10 ≤ b ≤ 18 at.%, 10 ≤ c ≤ 18 at.%, 10 ≤ d ≤ 18 at.%, 17 ≤ e ≤ 20 at.%, 2 ≤ f ≤ 10 at.%, and a + b + c + d + e + f = 100. The high-entropy alloy has a eutectic structure.

[0007] For the above aspects and any possible implementation manners, a further implementation manner is provided. The chemical formula of the material of the high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 38 ≤ a ≤ 48 at.%, 10 ≤ b ≤ 15 at.%, 10 ≤ c ≤ 15 at.%, 10 ≤ d ≤ 15 at.%, 18.5 ≤ e ≤ 19.5 at.%, 3 ≤ f ≤ 8 at.%, and a + b + c + d + e + f = 100.

[0008] For the above aspects and any possible implementation manners, a further implementation manner is provided. When a = 48, b = 10, c = 10, d = 10, e = 19, f = 3, the chemical formula of the eutectic high-entropy alloy is: Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 , the yield strength of the alloy is 710 - 750 MPa, the tensile strength is 980 - 1100 MPa, and the elongation is 7 - 8%.

[0009] For the aspects and any possible implementation described above, a further implementation is provided. When a = 41.5, b = 12, c = 12, d = 10, e = 18.5, f = 6, the eutectic high-entropy alloy chemical formula is: Ni 41.5 Fe 12 Co 12 Cr 10 Al 18.5 Cu 6 , the yield strength of the alloy is 680 - 720 MPa, the tensile strength is 970 - 1050 MPa, and the elongation is 8 - 9.5%.

[0010] For the aspects and any possible implementation described above, a further implementation is provided. When a = 30, b = 15, c = 15, d = 15, e = 19, f = 6, the eutectic high-entropy alloy chemical formula is: Ni 30 Fe 15 Co 15 Cr 15 Al 19 Cu 6 , the yield strength of the alloy is 550 - 650 MPa, the tensile strength is 800 - 950 MPa, and the elongation is 3.5 - 5%.

[0011] For the aspects and any possible implementation described above, a further implementation is provided. When a = 45, b = 10, c = 10, d = 10, e = 19, f = 6, the eutectic high-entropy alloy chemical formula is: Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 , the yield strength of the alloy is 740 - 810 MPa, the tensile strength is 1050 - 1200 MPa, and the elongation is 8 - 11%.

[0012] For the aspects and any possible implementation described above, a further implementation is provided. When a = 43, b = 10, c = 10, d = 10, e = 19, f = 8, the eutectic high-entropy alloy chemical formula is: Ni 43 Fe 10 Co 10 Cr 10 Al 19 Cu 8 , the yield strength of the alloy is 600 - 720 MPa, the tensile strength is 760 - 880 MPa, and the elongation is 3.5 - 5%.

[0013] According to the above aspects and any possible implementation, a method for preparing a eutectic high entropy alloy containing copper is further provided, which is used to prepare the high entropy alloy, and the preparation method specifically comprises the following steps:

[0014] S1) Ingredients: The metal raw materials of Ni, Fe, Co, Cr, Al and Cu are mechanically ground to remove the oxide scale on the surface of the elements, and then placed in different containers and added with alcohol solution, ultrasonically cleaned, taken out and blown dry with alcohol to obtain six kinds of raw materials after ultrasonic treatment, and accurately weighed according to the composition of eutectic high entropy alloy to obtain Ni, Co, Fe, Cr, Al, Cu metal raw materials that meet the ratio quality;

[0015] S2) Alloy smelting: Put the metal raw materials that meet the ratio quality prepared in step S1) into the smelting equipment and evacuate to 1×10 -2 Pa, fill with argon to 0.05 MPa, turn on the power to melt the alloy, the melting number is not less than 4 times;

[0016] S3) Alloy casting: After repeated alloy smelting in S2), a crucible or a water-cooled copper mold is used for casting or suction casting to obtain a copper-containing eutectic high-entropy alloy component of a preset shape and size, wherein the copper-containing eutectic high-entropy alloy component is an alloy ingot with uniform composition, and the crucible is a graphite, carbon steel and / or oxide crucible.

[0017] According to the above aspects and any possible implementation, a further implementation is provided, wherein the high entropy alloy has a eutectic structure and a density of 7.3-7.5 g / cm 3 , tensile yield strength 600-780 MPa, tensile strength 800-1125MPa, elongation after break 4-9.5%.

[0018] The aspects described above and any possible implementation methods further provide an implementation method, an application of a eutectic high entropy alloy containing copper elements, and the copper-containing eutectic high entropy alloy can be applied to the field of marine engineering.

[0019] Compared with the prior art, the present invention can achieve the following technical effects:

[0020] (1) Compared with the existing eutectic high entropy alloys, the alloy of the present invention adds 2% to 10% of Cu element, providing antibacterial and anti-biological fouling capabilities that the existing eutectic high entropy alloys do not have.

[0021] (2) Compared with existing high entropy alloys, after adding the Cu element with anti-biofouling function, the alloy still maintains the eutectic structure, thus maintaining the excellent casting properties of the eutectic alloy.

[0022] (3) Compared with existing copper-containing high-entropy alloys, the high-entropy alloy of the present invention has excellent tensile strength and plasticity.

[0023] Of course, it is not necessary for any product implementing the present invention to achieve all the above-described technical effects simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the SEM backscattered photo of Example 1 of the present invention;

[0026] Figure 2 It is the SEM backscattered photo of Example 2 of the present invention;

[0027] Figure 3 It is the SEM backscattered photo of Example 3 of the present invention;

[0028] Figure 4 It is the SEM backscattered photo of Example 4 of the present invention;

[0029] Figure 5 It is the SEM backscattered photo of Example 5 of the present invention;

[0030] Figure 6 It is the engineering stress-strain curve of Examples 1-5 of the present invention;

[0031] Figure 7 It is the copper ion precipitation curve of Example 4 of the present invention;

[0032] Figure 8 It is the Tafel curve of Example 4 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below with reference to the drawings.

[0034] It should be clear that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0036] The present invention provides a eutectic high-entropy alloy containing copper element. The high-entropy alloy is a copper-containing eutectic high-entropy alloy of Ni-Fe-Co-Cr-Al-Cu system, and the chemical formula of the material of the high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 29 ≤ a ≤ 50 at.%, 10 ≤ b ≤ 18 at.%, 10 ≤ c ≤ 18 at.%, 10 ≤ d ≤ 18 at.%, 17 ≤ e ≤ 20 at.%, 2 ≤ f ≤ 10 at.%, and a + b + c + d + e + f = 100. The high-entropy alloy has a eutectic structure.

[0037] In a specific embodiment, the chemical formula of the material of the high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 38 ≤ a ≤ 48 at.%, 10 ≤ b ≤ 15 at.%, 10 ≤ c ≤ 15 at.%, 10 ≤ d ≤ 15 at.%, 18.5 ≤ e ≤ 19.5 at.%, 3 ≤ f ≤ 8 at.%, and a + b + c + d + e + f = 100.

[0038] In a specific embodiment, when a = 48, b = 10, c = 10, d = 10, e = 19, f = 3, the chemical formula of the eutectic high-entropy alloy is: Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 , and the yield strength of the alloy is 710 - 750 MPa, the tensile strength is 9800 - 1100 MPa, and the elongation is 7 - 8%.

[0039] In a specific embodiment, when a = 41.5, b = 12, c = 12, d = 10, e = 18.5, f = 6, the chemical formula of the eutectic high-entropy alloy is: Ni 41.5 Fe 12 Co 12 Cr 10Al 18.5 Cu 6 , the yield strength of the alloy is 680 - 720 MPa, the tensile strength is 970 - 1050 MPa, and the elongation is 8 - 9.5%.

[0040] In a specific embodiment, when a = 30, b = 15, c = 15, d = 15, e = 19, f = 6, the eutectic high-entropy alloy chemical formula is: Ni 30 Fe 15 Co 15 Cr 15 Al 19 Cu 6 , the yield strength of the alloy is 550 - 650 MPa, the tensile strength is 800 - 950 MPa, and the elongation is 3.5 - 5%.

[0041] In a specific embodiment, when a = 45, b = 10, c = 10, d = 10, e = 19, f = 6, the eutectic high-entropy alloy chemical formula is: Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 , the yield strength of the alloy is 740 - 810 MPa, the tensile strength is 1050 - 1200 MPa, and the elongation is 8 - 11%.

[0042] In a specific embodiment, when a = 43, b = 10, c = 10, d = 10, e = 19, f = 8, the eutectic high-entropy alloy chemical formula is: Ni 43 Fe 10 Co 10 Cr 10 Al 19 Cu 8 , the yield strength of the alloy is 600 - 720 MPa, the tensile strength is 760 - 880 MPa, and the elongation is 3.5 - 5%.

[0043] The present invention also provides a preparation method of a eutectic high-entropy alloy containing copper element for preparing the above-mentioned high-entropy alloy. The preparation method specifically includes the following steps:

[0044] S1) Batching: Use mechanical grinding method to remove the oxide scale on the surface of the metal raw materials of Ni, Fe, Co, Cr, Al and Cu, then place them in different containers and add alcohol solution, ultrasonically clean, take out and dry the alcohol to obtain the six kinds of raw materials after ultrasonic treatment, and accurately weigh according to the composition of the eutectic high-entropy alloy to obtain the Ni, Co, Fe, Cr, Al, Cu metal raw materials that meet the ratio quality;

[0045] S2) Alloy Melting: Put the metal raw materials with the mass meeting the ratio in step S1) into the melting equipment, evacuate to below 1×10 -2 Pa, fill with argon to 0.05 MPa, turn on the power for alloy melting, and the number of melting times is not less than 4 times;

[0046] S3) Alloy Casting: After repeated alloy melting in S2), use a crucible or a water-cooled copper mold for casting or suction casting to obtain a copper-containing eutectic high-entropy alloy component with a preset shape and size. The copper-containing eutectic high-entropy alloy component is an alloy ingot with uniform composition, and the crucible is a graphite, carbon steel, and / or oxide crucible.

[0047] The high-entropy alloy has a eutectic structure, with a density of 7.3 - 7.5 g / cm 3 , a tensile yield strength of 600 - 780 MPa, a tensile strength of 800 - 1125 MPa, and an elongation after fracture of 4 - 9.5%. The described copper-containing eutectic high-entropy alloy can be applied to the field of ocean engineering

[0048] Example 1

[0049] A copper-containing eutectic high-entropy alloy material, and the chemical composition of the high-entropy alloy is designed according to the molar ratio as Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 .

[0050] 1) Batching: Use mechanical grinding to remove the oxide scale on the surface of the Ni, Fe, Co, Cr, Al, and Cu metal raw materials, then place them in different containers and add an alcohol solution, perform ultrasonic cleaning, and take them out and dry the alcohol to obtain the six raw materials after ultrasonic treatment. Accurately weigh according to the composition of the eutectic high-entropy alloy to obtain the Ni, Co, Fe, Cr, Al, and Cu metal raw materials with the mass meeting the ratio.

[0051] 2) Alloy Melting: Put the metal raw materials prepared in step 1) into melting equipment such as a vacuum medium-frequency induction melting furnace, a non-consumable vacuum arc furnace, and a vacuum levitation induction melting furnace, evacuate to below 5×10 -3 Pa, fill with industrial pure argon to 0.05 MPa, and turn on the power for alloy melting. Before melting the alloy, first melt the Ti ingot to absorb the residual oxygen in the furnace, and then melt the alloy raw materials. To ensure the uniform composition of the master alloy ingot, after each melting, use a turning shovel to turn the alloy ingot over and melt it again. Each alloy ingot is repeatedly melted at least 4 times to obtain an alloy ingot with uniform composition.

[0052] 3) Alloy Casting: After vacuum melting, use a water-cooled copper mold for suction casting into a 10×10×50 mm 3Test bar

[0053] 4) Microstructural characterization: The morphology and microstructure of the Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 alloy were characterized using a Zeiss Supra55 scanning electron microscope (SEM). The results are shown in the appendix Figure 1 and it has a typical dense lamellar eutectic structure

[0054] 5) Tensile property test: The room-temperature tensile properties of the Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 alloy were tested using a CMT4105 universal tensile testing machine. The results are shown in the appendix Figure 6 and it was found that the yield strength of the alloy was 735 MPa, the ultimate tensile strength was 1050 MPa, and the elongation after fracture was 7.67% under engineering stress-strain conditions

[0055] Example 2

[0056] A copper-containing eutectic high-entropy alloy material, the chemical composition of the high-entropy alloy is designed according to the molar ratio as Ni 41.5 Fe 12 Co 12 Cr 10 Al 18.5 Cu 6 The preparation method and testing method are the same as those in Example 1

[0057] 1) Microstructural characterization results: The SEM backscattered electron image is shown in the appendix Figure 2 and it has a typical lamellar eutectic structure

[0058] 2) Tensile property test results are shown in the appendix Figure 6 and it was found that the yield strength of the alloy was 704 MPa, the ultimate tensile strength was 1017 MPa, and the elongation after fracture was 8.80% under engineering stress-strain conditions

[0059] Example 3

[0060] A copper-containing eutectic high-entropy alloy material, the chemical composition of the high-entropy alloy is designed according to the molar ratio as Ni 30 Fe 15 Co 15 Cr 15 Al 19 Cu 6。The preparation method, the methods for testing the microstructure and tensile properties are the same as those in Example 1.

[0061] 1) Results of microstructure characterization: The SEM backscattered electron image is as shown Figure 3 below, showing a typical lamellar eutectic structure.

[0062] 2) Tensile property test: The results are as shown Figure 6 below. Under engineering stress-strain conditions, the yield strength of the alloy is 602 MPa, the ultimate tensile strength is 838 MPa, and the elongation after fracture is 5.60%.

[0063] 3) Density test: The density of the Ni 30 Fe 15 Co 15 Cr 15 Al 19 Cu 6 alloy is measured to be 7.31 g / cm 3 .

[0064] Example 4

[0065] A copper-containing eutectic high-entropy alloy material, the chemical composition of the high-entropy alloy is designed according to the molar ratio as Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 . The preparation method, the methods for testing the microstructure and tensile properties are the same as those in Example 1.

[0066] 1) Microstructure characterization: The SEM backscattered electron image is as shown Figure 3 below, showing a typical lamellar eutectic structure.

[0067] 2) Tensile property test: The results are as shown Figure 6 below. Under engineering stress-strain conditions, the yield strength of the alloy is 778 MPa, the ultimate tensile strength is 1124 MPa, and the elongation after fracture is 9.47%.

[0068] 3) Density test: The density of the Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 alloy is measured to be 7.39 g / cm 3 .

[0069] 4) Copper ion precipitation test: Samples with dimensions of 8×8×2 mm 3The alloy sheet samples were immersed in 3.5 wt.% NaCl solution in centrifuge tubes for 6, 12, 24, and 48 h respectively, and the copper ion concentration in each solution was measured by ICP-MS (Inductively Coupled Plasma Mass Spectrometer). The results are as attached Figure 7 as shown. It can be seen that the copper ion concentration reaches 0.04 mg / cm 3 .

[0070] 5) Electrochemical performance test: Using Chenhua CHI604E electrochemical workstation, the polarization curves of Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 eutectic high-entropy alloy were tested in 3.5 wt.% NaCl solution. As attached Figure 8 as shown, the self-corrosion current density is 1.94×10 -6 A / cm 2 , and the self-corrosion current density of nickel-aluminum bronze alloy is 1.9×10 -5 A / cm 2 . It shows that the high-entropy alloy of the present invention has a lower corrosion rate.

[0071] Example 5

[0072] A copper-containing eutectic high-entropy alloy material, the chemical composition of the high-entropy alloy is designed by molar ratio as Ni 43 Fe 10 Co 10 Cr 10 Al 19 Cu 8 . Its preparation method, microstructure and tensile property test method are the same as those in Example 1.

[0073] 1) Microstructure characterization: The SEM backscattered photo is as attached Figure 5 as shown, with a typical lamellar eutectic structure.

[0074] 2) Tensile property test: The results are as attached Figure 6 as shown. Under the engineering stress-strain condition, the yield strength of the alloy is 674 MPa, the ultimate tensile strength is 800 MPa, and the elongation after fracture is 4.10%.

[0075] Due to the characteristics of high strength, corrosion resistance and good casting performance of eutectic high-entropy alloys, taking the application background of the marine environment as an example, being used as ship propellers is a very potential application scenario for eutectic high-entropy alloys (currently, propellers are mainly cast from copper alloys). In order to avoid biofouling corrosion caused by marine microorganisms during service, metal materials used in the marine environment often contain copper elements. However, since the mixing enthalpies of copper with commonly used elements such as Fe, Cr, Co, and Ni in eutectic high-entropy alloys are all positive values, the addition of copper easily destroys the eutectic structure. Therefore, there has been no research report on copper-containing eutectic high-entropy alloys so far. The most significant feature of the alloy system described in the present invention is the introduction of copper elements with anti-marine fouling performance while maintaining the eutectic structure and good tensile properties. The present invention realizes the design of copper-containing eutectic structure by finely regulating the contents of elements such as Fe, Cr, and Co that have positive mixing enthalpies with the Cu element. When designing the composition of the alloy of the present invention, the effects of various elements on the microstructure, mechanical properties, corrosion resistance, and anti-biofouling performance of the alloy are comprehensively considered. Compared with existing eutectic high-entropy alloys, it has the following advantages:

[0076] (1) Compared with existing eutectic high-entropy alloys, the alloy of the present invention adds 2% - 10% of Cu element, providing antibacterial and anti-biofouling capabilities that existing eutectic high-entropy alloys do not possess.

[0077] (2) Compared with existing high-entropy alloys, after adding Cu element with anti-biofouling function, the alloy still maintains the eutectic structure, so it can maintain the excellent casting performance of eutectic alloys.

[0078] (3) Compared with existing copper-containing high-entropy alloys, the high-entropy alloy of the present invention has excellent tensile strength and plasticity.

[0079] The above has introduced in detail a copper-containing eutectic high-entropy alloy and its preparation method and application provided by the embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

[0080] As used in the specification and claims, certain terms are used to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not distinguish components by the difference in names, but by the difference in functions. As used throughout the specification and claims, the terms "comprising" and "including" are open-ended terms and should be interpreted as "comprising / including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The following description in the specification is the preferred embodiment for implementing the present application, but the description is for the purpose of explaining the general principles of the present application and not for limiting the scope of the present application. The protection scope of the present application shall be subject to what is defined by the appended claims.

[0081] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such commodity or system. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0082] It should be understood that the term "and / or" used herein is merely a description of the relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0083] The above description shows and describes several preferred embodiments of the present application. However, as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept of the present application described herein through the above teachings or the technology or knowledge in the relevant field. And the changes and variations made by those skilled in the art that do not depart from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. A copper-containing eutectic high entropy alloy, It is characterized in that The chemical formula of the copper-containing eutectic high-entropy alloy is: Ni a Fe b Co c Cr d Al e Cu f , where 38 ≤ a ≤ 48 at.%, 10 ≤ b ≤ 15 at.%, 10 ≤ c ≤ 15 at.%, 10 ≤ d ≤ 15 at.%, 18.5 ≤ e ≤ 19.5 at.%, 3 ≤ f ≤ 8 at.%, and a + b + c + d + e + f = 100; The copper-containing eutectic high entropy alloy is obtained by the following preparation method: S1) Ingredients: The metal raw materials of Ni, Fe, Co, Cr, Al and Cu are mechanically ground to remove the oxide scale on the surface of the elements, and then placed in different containers and added with alcohol solution, ultrasonically cleaned, and then taken out and blown dry with alcohol to obtain six kinds of raw materials after ultrasonic treatment, and accurately weighed according to the composition of the copper-containing eutectic high entropy alloy to obtain Ni, Co, Fe, Cr, Al, Cu metal raw materials that meet the ratio quality; S2) Alloy melting: Put the metal raw materials with the mass meeting the ratio prepared in step S1) into the melting equipment, evacuate to below 1×10 -2 Pa, fill with argon to 0.05 MPa, turn on the power supply for alloy melting, and the number of melting times is not less than 4 times; S3) alloy casting: after repeated alloy smelting in S2), casting or suction casting is performed using a crucible or a water-cooled copper mold to obtain a copper-containing eutectic high-entropy alloy component of a preset shape and size, wherein the copper-containing eutectic high-entropy alloy component is an alloy ingot with uniform composition, and the crucible is a graphite, carbon steel or oxide crucible; The copper-containing eutectic high-entropy alloy has a eutectic structure, with a density of 7.3-7.5 g / cm 3 , a tensile yield strength of 600-780 MPa, a tensile strength of 800-1125 MPa, and an elongation after fracture of 4-9.5%.

2. The copper-containing eutectic high entropy alloy according to claim 1, It is characterized in that When a = 48, b = 10, c = 10, d = 10, e = 19, f = 3, the chemical formula of the copper-containing eutectic high-entropy alloy is: Ni 48 Fe 10 Co 10 Cr 10 Al 19 Cu 3 , the yield strength is 710 - 750 MPa, the tensile strength is 980 - 1100 MPa, and the elongation is 7 - 8%.

3. The copper-containing eutectic high entropy alloy according to claim 1, It is characterized in that When a = 41.5, b = 12, c = 12, d = 10, e = 18.5, f = 6, the chemical formula of the copper-containing eutectic high-entropy alloy is: Ni 41.5 Fe 12 Co 12 Cr 10 Al 18.5 Cu 6 , the yield strength is 680 - 720 MPa, the tensile strength is 970 - 1050 MPa, and the elongation is 8 - 9.5%.

4. The copper-containing eutectic high entropy alloy according to claim 1, It is characterized in that When a = 45, b = 10, c = 10, d = 10, e = 19, f = 6, the chemical formula of the copper-containing eutectic high-entropy alloy is: Ni 45 Fe 10 Co 10 Cr 10 Al 19 Cu 6 , the yield strength is 740 - 780 MPa, the tensile strength is 1050 - 1125 MPa, and the elongation is 8 - 9.5%.

5. The copper-containing eutectic high entropy alloy according to claim 1, It is characterized in that When a = 43, b = 10, c = 10, d = 10, e = 19, f = 8, the chemical formula of the copper-containing eutectic high-entropy alloy is: Ni 43 Fe 10 Co 10 Cr 10 Al 19 Cu 8 , the yield strength is 600 - 720 MPa, the tensile strength is 800 - 880 MPa, and the elongation is 4 - 5%.

6. Application of a copper-containing eutectic high entropy alloy, It is characterized in that The copper-containing eutectic high entropy alloy described in any one of claims 1 to 5 is applied in the field of marine engineering.

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