High-hardness corrosion-resistant high-entropy alloy and preparation method and application thereof

Abstract

The invention provides a high-hardness corrosion-resistant high-entropy alloy as well as a preparation method and application thereof. The high-entropy alloy comprises metal elements Fe, Co, Cr, Ni and Al and a non-metal element M, wherein M comprises Si and / or C; the mass ratio of Fe to Co to Cr to Ni to Al is 1: 1: 1: 1: (0.08-0.12); on the basis of the total mass of the metal elements, the molar weight of the added non-metal elements is 0.3-1 mol. The preparation method comprises the steps that alloy raw materials are mixed according to the proportion, then ball milling and hot isostatic pressing are sequentially conducted, and the high-entropy alloy is obtained; the temperature of the hot isostatic pressing is 900-1100 DEG C, and the time is longer than or equal to 2 hours. By controlling the content of the Al element and the non-metallic element, the corrosion resistance of the alloy is enhanced while the hardness of the alloy is improved; and the high-entropy alloy with uniform components and excellent performance can be prepared through a method of combining ball milling and hot isostatic pressing.

Description

Technical Field

[0001] The invention belongs to the technical field of high entropy alloy preparation, and relates to a high-hardness, corrosion-resistant high entropy alloy and a preparation method and application thereof. Background Art

[0002] High-entropy alloys (HEA) are alloys formed by five or more metals in approximately equal amounts. Unlike traditional alloys, high-entropy alloys have no main component, and the mass or molar amount of each component is similar. In the past, if more metal types are added to the alloy, the material will become brittle, but high-entropy alloys are different from previous alloys. They have multiple metals but will not become brittle, and are a new material.

[0003] The current synthesis methods of high entropy alloys are mainly laser cladding, plasma sintering and arc furnace methods. CN105401042A discloses the application of high entropy alloy powder in laser cladding. The high entropy alloy powder is composed of Fe, Ni, Cr, Al, Cu and Mn element powders, and the composition is expressed as FeNiCrAlCuMnx, where x is the molar ratio of Mn and its value range is 0 to 1. The proportion is calculated according to the molar ratio of each element, and the mass of each component is accurately weighed and then fully mixed to make it uniform. After mixing the high entropy alloy powder and ethanol, it is evenly coated on the surface of the base material, and the cladding layer can be obtained by laser cladding after drying.

[0004] CN108642362A discloses a high entropy alloy and a preparation method thereof. The element components in the high entropy alloy are Cr, Fe, Co, Ni and Ta in non-equiatomic ratios. The preparation method comprises: placing weighed raw materials in an arc melting furnace for melting to obtain the high entropy alloy.

[0005] However, the above method requires high energy consumption and has great operational safety risks. In addition, the components of the high-entropy alloy samples obtained are uneven, and it is impossible to obtain samples with uniform composition, which affects their performance expression.

[0006] Therefore, developing a high-entropy alloy with uniform composition, high hardness and corrosion resistance and a preparation method thereof is an urgent problem to be solved by technicians in this field. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-hardness and corrosion-resistant high-entropy alloy and a preparation method and application thereof. By controlling the content of Al element and non-metallic elements, the hardness of the alloy is increased while the corrosion resistance of the alloy is enhanced; a high-entropy alloy with uniform composition and excellent performance can be obtained by combining ball milling with hot isostatic pressing.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a high-hardness and corrosion-resistant high-entropy alloy, the high-entropy alloy comprising: metal elements Fe, Co, Cr, Ni, Al and a non-metallic element M; wherein M comprises Si and / or C;

[0010] The mass ratio of Fe, Co, Cr, Ni and Al is 1:1:1:1:(0.08-0.12), for example, it can be 1:1:1:1:0.085, 1:1:1:1:0.09, 1:1:1:1:0.095, 1:1:1:1:0.1 or 1:1:1:1:0.11, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable;

[0011] Based on the total mass of the metal elements, the molar amount of the non-metallic elements added is 0.3-1 mol, for example, it can be 0.4 mol, 0.5 mol, 0.6 mol, 0.7 mol, 0.8 mol or 0.9 mol, etc., but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0012] In the present invention, the high entropy alloy is a hexagonal close-packed lattice (HCP).

[0013] The high entropy alloy provided by the present invention adds a certain proportion of Al element to the FeCoCrNi alloy system, thereby promoting the alloying process of the system, enhancing the anti-corrosion effect, and promoting the transformation of the alloy phase structure; at the same time, by adding a certain amount of non-metallic elements, the alloy structure is refined and the hardness of the alloy is improved.

[0014] It is worth noting that the atomic sizes of the three metal elements FeCrNi are relatively close, and it is easier to form a stable solid solution. In the present invention, the Fe element can improve the mixing entropy of the alloy system; the Cr element is beneficial to improving the hardness and wear resistance of the alloy; the Ni element has good plasticity, corrosion resistance and high temperature resistance; Co has good high temperature resistance and corrosion resistance; the addition of the Al element will aggravate the lattice distortion, promote the transformation of the alloy phase structure, and at the same time improve the corrosion resistance of the alloy system; the addition of the Si element gradually refines the alloy structure, the hardness also increases, and the average friction coefficient gradually decreases; the C element is a solid solution element, which mainly plays a role in solid solution strengthening. Increasing the C content can significantly improve the strength of the material.

[0015] As a preferred technical solution of the present invention, based on the total mass of the metal elements, the molar amount of non-metallic elements added is 0.6-1 mol, for example, it can be 0.62 mol, 0.65 mol, 0.7 mol, 0.75 mol, 0.8 mol, 0.85 mol, 0.9 mol or 0.95 mol, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] In the present invention, by controlling the molar amount of the added non-metallic element within the range of 0.6-1 mol, the hardness of the alloy is further improved while ensuring the corrosion resistance of the high entropy alloy.

[0017] As a preferred technical solution of the present invention, the corrosion current density of the high entropy alloy in 3.5wt.% NaCl solution is ≤1.5×10 -5 A / cm 2 , for example, it can be 1.4×10 -5 A / cm 2 , 1.2×10 -5 A / cm 2 , 1×10 -5 A / cm 2 , 0.5×10 - 5 A / cm 2 , 0.4×10 -5 A / cm 2 or 0.2×10 -5 A / cm 2 The above range is not limited to the listed values, and other values ​​not listed within the above range are also applicable.

[0018] Preferably, the hardness of the high entropy alloy is ≥700HV, for example, it can be 710HV, 720HV, 730HV, 740HV, 750HV, 760HV, 780HV, 800HV, 810HV, 820HV or 850HV, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] In a second aspect, the present invention provides a method for preparing the high entropy alloy as described in the first aspect, the preparation method comprising:

[0020] The alloy raw materials are mixed according to a proportion, and then ball milled and hot isostatic pressed in sequence to obtain the high entropy alloy;

[0021] The temperature of the hot isostatic pressing is 900-1100°C, for example, it can be 920°C, 950°C, 960°C, 980°C, 1000°C, 1020°C, 1050°C, 1060°C or 1080°C, and the time is ≥2h, for example, it can be 2.5h, 3h, 3.5h, 4h, 4.5h, 5h, 5.5h or 6h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] The present invention combines ball milling with hot isostatic pressing, and controls the temperature and time parameter range of hot isostatic pressing to prepare a high entropy alloy with uniform composition and excellent performance. The preparation method has low cost and low energy consumption, and the obtained alloy has excellent performance and is easy to mass produce, thus having broad application prospects.

[0023] It is worth noting that the present invention realizes mechanized alloying by ball milling, then seals the powder by canning, and after vacuuming, uses hot isostatic pressing near net forming technology to realize the preparation of bulk high entropy alloy with uniform components and excellent performance. Since hot isostatic pressing near net forming technology can realize metal powder metallurgy near net forming through a mold, and high temperature and isostatic pressure promote the sintering process and the close stacking and densification between powders, it effectively improves the density of the material and the connection between particles, thereby enhancing the performance of the alloy.

[0024] As a preferred technical solution of the present invention, the ball milling is carried out under a protective atmosphere.

[0025] In the present invention, the protective atmosphere includes argon gas; argon gas is filled during the ball milling process to prevent oxidation.

[0026] Preferably, the ball milling includes a first ball milling and a second ball milling performed sequentially.

[0027] Preferably, the rotation speed of the first ball mill is 350-500rpm / min, for example, it can be 360rpm / min, 380rpm / min, 400rpm / min, 420rpm / min, 450rpm / min, 460rpm / min or 480rpm / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] Preferably, the first ball milling time is 7-10 h, for example, 7.5 h, 8 h, 8.5 h, 9 h, 9.5 h or 9.8 h, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] Preferably, the rotation speed of the second ball mill is 100-200 rpm / min, for example, it can be 110 rpm / min, 120 rpm / min, 130 rpm / min, 140 rpm / min, 150 rpm / min, 160 rpm / min, 170 rpm / min, 180 rpm / min or 190 rpm / min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0030] Preferably, the second ball milling time is 10-20 min, for example, it can be 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min or 19 min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] In the present invention, the relevant parameters of the first ball mill and the second ball mill are controlled to ensure that the raw material components are mixed evenly.

[0032] Preferably, after the second ball milling, the average particle size of the obtained alloyed powder is 10-20 μm, for example, it can be 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm or 19 μm, etc., but is not limited to the listed values, and other unlisted values ​​within this numerical range are also applicable.

[0033] As a preferred technical solution of the present invention, after the ball milling and before the hot isostatic pressing, the alloyed powder is packed into a package and then degassed.

[0034] In the present invention, the sheath comprises a carbon steel sheath. Through degassing treatment, the gas adsorbed on the surface of the powder during the powder mixing process is fully removed to achieve the purpose of removing gas impurities to the greatest extent.

[0035] Preferably, the temperature of the degassing treatment is 300-600°C, for example, it can be 320°C, 350°C, 360°C, 380°C, 400°C, 420°C, 450°C, 460°C, 480°C, 500°C, 520°C, 550°C, 560°C or 580°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] Preferably, the vacuum degree of the degassing treatment is ≤2×10 -3 Pa.

[0037] Preferably, the holding time of the degassing treatment is 2-6h, for example, it can be 2.5h, 3h, 3.5h, 4h, 4.5h, 5h or 5.5h, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0038] As a preferred technical solution of the present invention, the hot isostatic pressing pressure is 150-170MPa, for example, it can be 152Pa, 155MPa, 156MPa, 158MPa, 160MPa, 162Pa, 165MPa, 166MPa or 188MPa, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0039] Preferably, the heating method of the hot isostatic pressing includes the following:

[0040] The hot isostatic pressing is performed by one-stage heating, the end point temperature is 900-1100° C., and the holding time is ≥2h; or

[0041] The hot isostatic pressing comprises a first temperature increase and a second temperature increase performed sequentially.

[0042] Preferably, the hot isostatic pressing is followed by furnace cooling to room temperature.

[0043] As a preferred technical solution of the present invention, the endpoint temperature of the first heating is 900-1000°C, for example, it can be 910°C, 920°C, 930°C, 940°C, 950°C, 960°C, 970°C, 980°C or 990°C, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0044] Preferably, the first heating insulation time is 2-4h, for example, it can be 2.2h, 2.5h, 2.6h, 2.8h, 3h, 3.2h, 3.5h, 3.6h or 3.8h, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0045] Preferably, the endpoint temperature of the second heating is 1000-1100°C, excluding 1000°C, for example, it can be 1010°C, 1020°C, 1030°C, 1040°C, 1050°C, 1060°C, 1070°C, 1080°C or 1090°C, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0046] Preferably, the second heating insulation time is 10-30 min, for example, it can be 12 min, 15 min, 16 min, 18 min, 20 min, 22 min, 25 min, 26 min or 28 min, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0047] In the present invention, the temperature rise process during hot isostatic pressing is controlled, which is beneficial to promoting alloying and improving the density and strength of the material.

[0048] As a preferred technical solution of the present invention, the preparation method comprises the following steps:

[0049] (1) mixing alloy raw materials according to a certain proportion, and then ball milling them under a protective atmosphere to obtain alloy powder;

[0050] The ball milling includes a first ball milling and a second ball milling performed sequentially; the first ball milling has a rotation speed of 350-500 rpm / min and a time of 7-10 hours; the second ball milling has a rotation speed of 100-200 rpm / min and a time of 10-20 minutes;

[0051] (2) placing the alloyed powder obtained in step (1) into a package, and then sequentially performing degassing treatment and hot isostatic pressing to obtain the high entropy alloy;

[0052] The degassing temperature is 300-600°C and the vacuum degree is ≤2×10 -3 Pa, insulation time is 2-6h;

[0053] The hot isostatic pressing pressure is 150-170 MPa;

[0054] The heating methods of the hot isostatic pressing include the following:

[0055] The hot isostatic pressing is performed by one-stage heating, the end point temperature is 900-1100° C., and the holding time is ≥2h; or

[0056] The hot isostatic pressing comprises a first temperature increase and a second temperature increase performed sequentially;

[0057] The terminal temperature of the first heating is 900-1000°C, and the holding time is 2-4h; the terminal temperature of the second heating is 1000-1100°C, excluding 1000°C, and the holding time is 10-30min;

[0058] After the hot isostatic pressing, the material is further cooled to room temperature in the furnace.

[0059] In a third aspect, the present invention provides an application of the high entropy alloy as described in the first aspect, wherein the high entropy alloy is used for the preparation of marine anti-corrosion materials.

[0060] In the present invention, the high entropy alloy prepared by combining ball milling with hot isostatic pressing has high hardness and good anti-corrosion effect, and can be widely used in the preparation of marine anti-corrosion materials, such as the surface of steel in the wave splash zone and the seawater tidal zone. At the same time, the Fe element content in the system is high, which can be more closely combined with the steel and enhance the stability of the overall structure.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] (1) The high entropy alloy provided by the present invention can promote the transformation of alloy phase structure, refine the alloy structure, improve the hardness of the alloy, and enhance the corrosion resistance of the alloy by controlling the content of Al element and non-metallic elements; the high entropy alloy can be used for the preparation of marine anti-corrosion materials;

[0063] (2) The preparation method provided by the present invention realizes mechanized alloying through ball milling, then seals the powder through a can, and after vacuuming, uses hot isostatic pressing near-net forming technology, combined with controlling the temperature and time parameter range of hot isostatic pressing, to achieve the preparation of bulk high-entropy alloy with uniform composition and excellent performance; the preparation method has low cost and low energy consumption, the obtained alloy has excellent performance, is easy to mass produce, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is the polarization curve of the high entropy alloy prepared in Example 1 in 3.5wt.% NaCl solution. DETAILED DESCRIPTION

[0065] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0066] Example 1

[0067] This embodiment provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, wherein the high-entropy alloy comprises: metal elements Fe, Co, Cr, Ni, Al and non-metallic elements Si;

[0068] The mass ratio of Fe, Co, Cr, Ni and Al is 1:1:1:1:0.1;

[0069] Based on the total mass of the metal elements, the molar amount of the non-metallic element Si added is 0.75 mol;

[0070] The preparation method comprises the following steps:

[0071] (1) mixing iron powder, cobalt powder, chromium powder, nickel powder, aluminum powder and silicon powder in proportion, and then ball milling the mixture under an argon atmosphere to obtain an alloyed powder;

[0072] The ball milling includes a first ball milling and a second ball milling performed sequentially; the first ball milling has a rotation speed of 420 rpm / min and a time of 8 hours; the second ball milling has a rotation speed of 150 rpm / min and a time of 15 minutes;

[0073] (2) placing the alloyed powder obtained in step (1) into a carbon steel sheath, and then sequentially performing degassing treatment and hot isostatic pressing to obtain the high entropy alloy;

[0074] The degassing temperature is 450°C and the vacuum degree is 2×10 -3 Pa, holding time is 2h;

[0075] The hot isostatic pressing pressure is 160 MPa;

[0076] The hot isostatic pressing includes a first heating and a second heating in sequence; after the hot isostatic pressing, furnace cooling to room temperature and machining are performed in sequence;

[0077] The end temperature of the first heating is 950° C. and the holding time is 3 hours; the end temperature of the second heating is 1050° C. and the holding time is 20 minutes.

[0078] Figure 1 is the polarization curve of the high entropy alloy prepared in this embodiment in 3.5wt.% NaCl solution, Figure 1 It can be seen that the corrosion current density of the obtained bulk high entropy alloy in 3.5wt.% NaCl solution is 3.99×10 -6 A / cm 2 , has good corrosion resistance.

[0079] Example 2

[0080] This embodiment provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof. Except that the hot isostatic pressing is subjected to a one-stage heating process, the end temperature is 920° C., and the holding time is 4 hours; other conditions are the same as those in Example 1.

[0081] Example 3

[0082] This embodiment provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the molar amount of the non-metallic element Si added is 0.5 mol based on the total mass of the metal elements; other conditions are the same as those in Example 2.

[0083] Example 4

[0084] This embodiment provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the hot isostatic pressing pressure is 80 MPa; other conditions are the same as those in Example 2.

[0085] Example 5

[0086] This embodiment provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the hot isostatic pressing pressure is 190 MPa; other conditions are the same as those in Example 2.

[0087] Comparative Example 1

[0088] This comparative example provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the molar amount of the non-metallic element Si added is 0.25 mol based on the total mass of the metal elements; other conditions are the same as those in Example 2.

[0089] Comparative Example 2

[0090] This comparative example provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the end temperature of the hot isostatic pressing is 800°C; other conditions are the same as those in Example 2.

[0091] Comparative Example 3

[0092] This comparative example provides a high-hardness, corrosion-resistant high-entropy alloy and a preparation method thereof, except that the end temperature of the hot isostatic pressing is 1300°C; other conditions are the same as those in Example 2.

[0093] Comparative Example 4

[0094] This comparative example provides a high entropy alloy and a preparation method thereof, except that conventional laser cladding method is used instead of hot isostatic pressing; other conditions are the same as those in Example 2.

[0095] The high entropy alloys prepared in the above examples were characterized, the hardness was measured using a Vickers hardness tester, and the corrosion resistance was tested after constant potential passivation in seawater (3.5wt.% NaCl solution). The above results are shown in Table 1.

[0096] Table 1

[0097]

[0098] Among them, “ / ” means that it cannot be formed;

[0099] From Table 1, we can see that:

[0100] (1) The high entropy alloys and preparation methods thereof provided in Examples 1-3 of the present invention have both high hardness and good corrosion resistance, and the corrosion current density in a 3.5wt.% NaCl solution is ≤1.5×10 -5 A / cm 2 , hardness ≥700HV; and the heating method of hot isostatic pressing can be selected independently according to the actual hardness or corrosion resistance requirements;

[0101] (2) It can be seen from the comparison between Example 2 and Examples 4-5 that when the hot isostatic pressing pressure is too low, the high entropy alloy cannot be formed well, resulting in the failure to obtain a high entropy alloy; when the hot isostatic pressing pressure is too high, the corrosion resistance of the obtained high entropy alloy cannot meet the use requirements;

[0102] (3) It can be seen from the comparison between Example 2 and Comparative Example 1 that when too little non-metallic element is added, although the corrosion resistance meets the requirements, it is not conducive to improving the hardness performance;

[0103] (4) It can be seen from the comparison between Example 2 and Comparative Examples 2-3 that when the end point temperature of hot isostatic pressing is too low, the physicochemical properties of the metal components remain unchanged, the powder material cannot form an alloy block, and thus a high entropy alloy cannot be obtained; when the end point temperature of hot isostatic pressing is too high, the material is in a molten state, and there is a risk of burning through the sheath;

[0104] (5) By comparing Example 2 and Comparative Example 4, it can be seen that when the conventional laser cladding method is used to prepare the high entropy alloy, the hardness of the obtained high entropy alloy is low and the corrosion resistance is reduced, which cannot meet the use requirements.

[0105] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A high-hardness, corrosion-resistant high-entropy alloy, characterized in that: The high entropy alloy comprises: metal elements Fe, Co, Cr, Ni, Al and non-metallic element M; wherein M comprises Si and / or C; The mass ratio of Fe, Co, Cr, Ni and Al is 1:1:1:1:(0.08-0.12); Based on the total mass of the metal elements, the molar amount of the non-metal elements added is 0.3-1 mol.

2. The high entropy alloy according to claim 1, characterized in that Based on the total mass of the metal elements, the molar amount of the non-metal elements added is 0.6-1 mol.

3. The high entropy alloy according to claim 1 or 2, characterized in that: The corrosion current density of the high entropy alloy in 3.5wt.% NaCl solution is ≤1.5×10 -5 A / cm 2 ; Preferably, the hardness of the high entropy alloy is ≥700 HV.

4. A method for preparing a high entropy alloy according to any one of claims 1 to 3, characterized in that: The preparation method comprises: The alloy raw materials are mixed according to a proportion, and then ball milled and hot isostatic pressed in sequence to obtain the high entropy alloy; The hot isostatic pressing is performed at a temperature of 900-1100° C. and for a time of ≥2 hours.

5. The preparation method according to claim 4, characterized in that: The ball milling is carried out under a protective atmosphere; Preferably, the ball milling includes a first ball milling and a second ball milling performed sequentially; Preferably, the rotation speed of the first ball mill is 350-500 rpm / min; Preferably, the first ball milling time is 7-10h; Preferably, the rotation speed of the second ball mill is 100-200 rpm / min; Preferably, the second ball milling time is 10-20 min; Preferably, after the second ball milling, the average particle size of the alloyed powder obtained is 10-20 μm.

6. The preparation method according to claim 5, characterized in that: After the ball milling, the alloyed powder is packed into a bag before hot isostatic pressing, and then degassing is performed; Preferably, the temperature of the degassing treatment is 300-600°C; Preferably, the vacuum degree of the degassing treatment is ≤2×10 -3 Pa; Preferably, the holding time of the degassing treatment is 2-6 hours.

7. The preparation method according to any one of claims 4 to 6, characterized in that: The hot isostatic pressing pressure is 150-170 MPa; Preferably, the heating method of the hot isostatic pressing includes the following: The hot isostatic pressing is performed by one-stage heating, the end point temperature is 900-1100° C., and the holding time is ≥2h; or The hot isostatic pressing comprises a first temperature increase and a second temperature increase performed sequentially; Preferably, the hot isostatic pressing is followed by furnace cooling to room temperature.

8. The preparation method according to claim 7, characterized in that: The end temperature of the first heating is 900-1000°C; Preferably, the first heating holding time is 2-4h; Preferably, the end point temperature of the second heating is 1000-1100° C., excluding 1000° C.; Preferably, the second heating holding time is 10-30 minutes.

9. The preparation method according to any one of claims 4 to 8, characterized in that: The preparation method comprises the following steps: (1) mixing alloy raw materials according to a certain proportion, and then ball milling them under a protective atmosphere to obtain alloy powder; The ball milling includes a first ball milling and a second ball milling performed sequentially; the first ball milling has a rotation speed of 350-500 rpm / min and a time of 7-10 hours; the second ball milling has a rotation speed of 100-200 rpm / min and a time of 10-20 minutes; (2) placing the alloyed powder obtained in step (1) into a package, and then sequentially performing degassing treatment and hot isostatic pressing to obtain the high entropy alloy; The degassing temperature is 300-600°C and the vacuum degree is ≤2×10 -3 Pa, insulation time is 2-6h; The hot isostatic pressing pressure is 150-170 MPa; The heating methods of the hot isostatic pressing include the following: The hot isostatic pressing is performed by one-stage heating, the end point temperature is 900-1100° C., and the holding time is ≥2h; or The hot isostatic pressing comprises a first temperature increase and a second temperature increase performed sequentially; The terminal temperature of the first heating is 900-1000°C, and the holding time is 2-4h; the terminal temperature of the second heating is 1000-1100°C, excluding 1000°C, and the holding time is 10-30min; After the hot isostatic pressing, the material is further cooled to room temperature in the furnace.

10. An application of the high entropy alloy according to any one of claims 1 to 3, characterized in that: The high entropy alloy is used for preparing marine anti-corrosion materials.

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