High-hardness and high-corrosion-resistance single-phase BCC structure high-entropy alloy and preparation method thereof

Abstract

The invention provides a single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance and a preparation method of the single-phase BCC structure high-entropy alloy. The high-entropy alloy provided by the invention comprises the following alloy components: Al, Fe, Ni, V and Si, the molar ratio of Al to Fe to Ni to V to Si is 1: 2: 2: 1: 0.05. The alloy is formed by five elements of Al, Fe, Ni, V and Si according to the specific atomic ratio of 1: 2: 2: 1: 0.05, and perfect combination of a single BCC phase, ultrahigh hardness (larger than or equal to 575 HV) and excellent corrosion resistance (smaller than or equal to 0.864 mu A / cm < 2 >) is obtained in a cast state. Moreover, the preparation method of the high-entropy alloy is simple in process and high in controllability, an alloy ingot with uniform components and a single structure can be obtained only through vacuum melting and repeated remelting, no subsequent heat treatment is needed, the production process is greatly simplified, and energy consumption and cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of novel metallic materials technology, specifically to a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy and its preparation method. Background Technology

[0002] High-entropy alloys (HEAs) are a new generation of metallic materials that break with traditional alloy design concepts. They are usually composed of four or more main elements in equal or near-equal atomic ratios. Due to their high-entropy effect, lattice distortion effect, hysteresis diffusion effect, and "cocktail" effect, they exhibit many superior properties that surpass those of traditional alloys, such as ultra-high strength, high hardness, good wear resistance, and corrosion resistance.

[0003] Among numerous high-entropy alloy systems, body-centered cubic (BCC) high-entropy alloys are typically known for their high strength and hardness, primarily due to their severe lattice distortion and solid solution strengthening effects. However, these alloys often face two key technical bottlenecks: firstly, the BCC structure is usually accompanied by poor room-temperature plasticity and machinability; secondly, certain alloying elements added to achieve high hardness (such as Al and V) may impair their corrosion resistance, limiting their application in corrosive environments. For example, in some Al-Co-Cr-Fe-Ni alloy systems, as the Al content increases, the BCC phase forms, significantly improving hardness, but also increasing their pitting corrosion susceptibility in chloride solutions.

[0004] To balance the strength and corrosion resistance of high-entropy alloys, existing technologies often employ the following strategies: First, designing two-phase or multi-phase alloys, such as eutectic high-entropy alloys, to improve plasticity through soft and tough phases (such as FCC phases). However, this method often comes at the cost of sacrificing some strength, and phase boundaries may become sensitive areas for corrosion initiation. Second, performing complex thermomechanical treatments (such as hot rolling, annealing, aging, etc.) on single-phase alloys to optimize their performance. However, this significantly increases the complexity of the production process and manufacturing costs, and may introduce residual stress or microstructure inhomogeneity.

[0005] Therefore, developing a high-entropy alloy that possesses a single, stable BCC phase in the as-cast state and can simultaneously achieve high hardness and excellent corrosion resistance without complex post-processing is of great scientific and engineering value for simplifying production processes, reducing costs, and expanding its applications in harsh environments. Summary of the Invention

[0006] The purpose of this invention is to provide a single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance and its preparation method, so as to overcome the technical defects of existing BCC structure high-entropy alloys that are difficult to balance hardness and corrosion resistance, and often require complex subsequent heat treatment or deformation processing.

[0007] This invention is implemented as follows: The high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy provided by this invention has the following alloy composition: Al, Fe, Ni, V and Si; the molar ratio of Al, Fe, Ni, V and Si is 1:2:2:1:0.05.

[0008] The chemical composition of this alloy can be simply represented as AlFe2Ni2Vsi. 0.05 This compositional design is key to achieving a balance between a single BCC phase in the as-cast state and excellent performance. Fe, Ni, V, and Al primarily constitute the BCC solid solution matrix, with V acting as a BCC structure stabilizer, contributing to the formation of a single BCC phase. The addition of trace amounts of Si (approximately 0.5 at.%) plays a crucial role in refining the microstructure and further improving the alloy's strength and corrosion resistance, with effects far exceeding those of simple linear superposition. The introduction of Si not only refines the grains (grain refinement strengthening) but also promotes the formation of a denser and more stable passivation film through grain boundary segregation, thereby simultaneously enhancing hardness and corrosion resistance.

[0009] This invention achieves a "singularity" in performance by using five elements—Al, Fe, Ni, V, and Si—in a specific atomic ratio (1:2:2:1:0.05). This results in a single BCC phase, ultra-high hardness (≥575 HV), and excellent corrosion resistance (≤0.864 μA / cm²) in the as-cast state. 2 A perfect combination of ).

[0010] Another objective of this invention is to provide a method for preparing the aforementioned high-entropy alloy. This method is simple and highly controllable, and alloy ingots with uniform composition and simple microstructure can be obtained simply through vacuum melting and repeated remelting, without any subsequent heat treatment, which greatly simplifies the production process and reduces energy consumption and costs.

[0011] The preparation method of the above-mentioned high-entropy alloy specifically includes the following steps: (1) Calculate and weigh high-purity blocky Al, Fe, Ni, V and Si as metal raw materials according to the atomic ratio Al:Fe:Ni:V:Si = 1:2:2:1:0.05; (2) Place the metal raw materials into the water-cooled copper crucible of the vacuum arc melting furnace in the order of Si, Al, V, Ni, Fe; (3) Evacuate the smelting furnace and fill it with protective gas; (4) Arc ignition melting of metal raw materials: After all the metals have been completely melted, the electromagnetic stirring system is turned on to promote the convection of the melt, and then it is quickly solidified into an ingot. (5) Turn the alloy ingot over and repeat step (4) several times to obtain a single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance.

[0012] Preferably, in step (3), the melting furnace is evacuated to a vacuum level ≤ 5.0 × 10⁻⁶. -3 Pa.

[0013] Preferably, in step (3), argon gas is introduced into the melting furnace as a protective gas until the pressure is slightly lower than atmospheric pressure.

[0014] Preferably, in step (4), during the smelting process, the arc-starting current is first adjusted to 80-100 A, and after the arc stabilizes, the smelting current is increased to 300-350 A.

[0015] Preferably, in step (4), after all the metals have completely melted and formed a bright molten pool, the electromagnetic stirring system is turned on, the stirring intensity is set to 70-80%, the molten material is convected, and the stirring time is not less than 3 minutes.

[0016] Preferably, step (4) is repeated at least 5 times in step (5).

[0017] Preferably, before arc-smelting the metal raw material in step (4), the titanium getter is first arc-smelted to absorb residual oxygen, nitrogen, and moisture in the furnace. The titanium getter is placed in the non-heated zone of the melting chamber. The titanium getter is titanium ingot (purity > 99.9%) or titanium shavings.

[0018] Through the precise compositional design described above, the alloy of this invention, in its as-cast state after vacuum arc melting and water-cooled copper mold casting, exhibits a single, stable body-centered cubic (BCC) solid solution phase structure, with no other secondary phases precipitating. This unique single-phase microstructure is the fundamental reason for its excellent and balanced comprehensive properties. Ultra-high hardness: The Vickers hardness (HV) of this alloy is no less than 575, which is significantly higher than many traditional alloys and dual-phase high-entropy alloys.

[0019] Excellent corrosion resistance: In standard three-electrode electrochemical tests using a 3.5 wt.% NaCl neutral solution as the electrolyte, this alloy exhibits extremely low corrosion current density, not exceeding 0.864 μA / cm. 2 This indicates that it has an excellent ability to resist uniform corrosion.

[0020] Another objective of this invention is to elucidate the application potential of this high-entropy alloy as a high-strength, high-wear-resistant structural material in harsh corrosive environments. The high-performance high-entropy alloy provided by this invention is particularly suitable for manufacturing components subjected to high mechanical loads in corrosive environments, such as marine engineering equipment, chemical reactor components, high-performance tools, and wear-resistant parts.

[0021] Compared with the prior art, the AlFe2Ni2Vsi provided by the present invention 0.05High-entropy alloys and their preparation methods have the following significant advantages and outstanding effects: 1. Breakthrough Balance in Performance: This invention successfully resolves the traditional contradiction of achieving both high-strength BCC alloys and high corrosion resistance. Through ingenious compositional design, a single as-cast BCC phase was obtained, enabling it to simultaneously possess ultra-high hardness (≥575 HV) and excellent corrosion resistance (corrosion current density ≤0.864 μA / cm). 2 This combination of properties is particularly rare among reported high-entropy alloys, breaking the conventional understanding that "high hardness is necessarily accompanied by a decrease in corrosion resistance".

[0022] 2. The production process is greatly simplified, resulting in significant cost benefits: The alloy of this invention requires no subsequent heat treatment or deformation processing. Its excellent properties are obtained immediately after melting and casting, which greatly shortens the production cycle, saves energy consumption and equipment investment, and reduces overall manufacturing costs, making it highly conducive to industrialization and application.

[0023] 3. Unique and stable microstructure: The obtained single BCC phase structure avoids the interphase corrosion or selective corrosion problems caused by the electrochemical potential difference between different phases in multiphase alloys, fundamentally improving the reliability of the alloy in corrosive environments. This structure is stable in the as-cast state and exhibits good performance consistency.

[0024] 4. Broad application prospects: The alloy’s excellent mechanical properties and chemical stability make it an ideal choice for manufacturing high-load wear-resistant components that operate in harsh corrosive environments, such as key fasteners and bearings for offshore platforms, valve cores and pump flow components in the petrochemical industry, and wear-resistant and corrosion-resistant components for nuclear power facilities. It has huge market potential and application value. Attached Figure Description

[0025] Figure 1 It is AlFe2Ni2VSi in Embodiment 1 of the present invention 0.05 XRD pattern of the ingot.

[0026] Figure 2 It is Al in Embodiment 2 of the present invention 0.1 Fe2Ni2V 0.1 Si 0.05 XRD pattern of the ingot.

[0027] Figure 3 It is AlCoFe2Ni2Si in Embodiment 3 of the present invention 0.05 XRD pattern of the ingot.

[0028] Figure 4 It is AlFe2Ni2VSi in Embodiment 1 of the present invention 0.05 Hardness test of ingots.

[0029] Figure 5 It is Al in Embodiment 2 of the present invention 0.1 Fe2Ni2V 0.1 Si 0.05 Hardness test of ingots.

[0030] Figure 6 It is AlCoFe2Ni2Si in Embodiment 3 of the present invention 0.05 Hardness test of ingots.

[0031] Figure 7 It is AlFe2Ni2VSi in Embodiment 1 of the present invention 0.05 TAFEL electrochemical polarization curves of the ingot.

[0032] Figure 8 It is Al in Embodiment 2 of the present invention 0.1 Fe2Ni2V 0.1 Si 0.05 TAFEL electrochemical polarization curves of the ingot.

[0033] Figure 9 It is AlCoFe2Ni2Si in Embodiment 3 of the present invention 0.05 TAFEL electrochemical polarization curves of the ingot. Detailed Implementation

[0034] The present invention will be further described in detail below through specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0035] Example 1: Alloy AlFe2Ni2VSi 0.05 Preparation of .

[0036] (1) Raw material preparation and weighing: Block aluminum (Al), iron (Fe), nickel (Ni), vanadium (V), and silicon (Si) with purities all exceeding 99.95 wt.% were selected as metal raw materials. Using a high-precision analytical balance (accuracy 0.1 mg), the mass of each raw material was accurately calculated and weighed according to the atomic ratio Al:Fe:Ni:V:Si = 1:2:2:1:0.05. Before weighing, all raw materials were ultrasonically cleaned sequentially with acetone and anhydrous ethanol for 10 minutes each to thoroughly remove surface grease and oxides, and then dried with cold air for later use.

[0037] (2) Smelting preparation: After cleaning and weighing, the metal raw materials are placed in a clean, water-cooled copper crucible in a vacuum arc melting furnace in order of increasing melting point (Si, Al, V, Ni, Fe). Si and Al, which have lower melting points and are more volatile, are placed at the bottom of the crucible to reduce burn-off during the melting process. To ensure a high purity melting atmosphere, high-purity titanium ingots (purity >99.9%) or titanium shavings are placed in the non-heated zone of the melting chamber as getters.

[0038] (3) Vacuum melting and homogenization remelting: ① Close the melting chamber, start the mechanical pump and molecular pump unit, and evacuate the vacuum in the furnace cavity to ≤ 5.0×10⁻⁶. -3 Pa. In this embodiment, the vacuum level inside the furnace cavity is evacuated to 4.0 × 10⁻⁶ Pa. -3 Pa.

[0039] ② Introduce high-purity argon gas (purity ≥ 99.999%) into the melting chamber in reverse as a protective gas until the pressure reaches -0.05 MPa (slightly lower than atmospheric pressure).

[0040] ③ First, ignite the titanium getter with an arc, setting the current to 100-150 A for 60 seconds to fully absorb the residual O2, N2, and H2O in the furnace and purify the smelting environment.

[0041] ④ Perform arc ignition melting on the alloy raw materials. The arc ignition current is 80-100 A. After the arc stabilizes, increase the melting current to 300-350 A. After all the metals have completely melted and formed a bright molten pool, turn on the electromagnetic stirring system and set the stirring intensity to 70-80% to promote strong convection of the melt. The stirring time should be no less than 3 minutes to ensure that the liquid alloy composition is highly uniform.

[0042] ⑤ Turn off the electric arc and allow the molten alloy to solidify rapidly into an ingot in the copper crucible.

[0043] ⑥ To completely eliminate microsegregation and achieve high compositional homogeneity, the alloy ingot must be flipped and the above-mentioned melting, stirring, and solidification processes must be repeated. This remelting step must be repeated no less than 5 times.

[0044] (4) Casting and sample preparation: Finally, the fully homogenized molten alloy is poured into a pre-shaped circulating water-cooled copper mold, utilizing its extremely high cooling rate (10). 2 -10 3Rapid solidification at K / s yields alloy ingots with uniform composition, dense structure, and no macroscopic segregation. The resulting ingots are sampled by wire cutting and progressively ground with silicon carbide (SiC) sandpaper in sequence (e.g., 150# → 400# → 1000# → 1500# → 2000#). Subsequently, they are mechanically polished to a mirror finish using diamond polishing paste. Finally, they are ultrasonically cleaned in anhydrous ethanol and dried to obtain high-quality alloy samples for performance testing.

[0045] Test results show that the AlFe2Ni2VSi alloy prepared in this embodiment... 0.05 It exhibits a single BCC phase structure and simultaneously possesses ultra-high hardness (≥575 HV) and low corrosion current density (≤0.864 μA / cm). 2 An excellent combination of ).

[0046] Example 2: Alloy Al 0.1 Fe2Ni2V 0.1 Si 0.05 Preparation of .

[0047] The preparation method is exactly the same as in Example 1, except that the ratio of raw materials is changed to make the composition Al. 0.1 Fe2Ni2V 0.1 Si 0.05 .

[0048] Test results show that the Al alloy prepared in this embodiment... 0.1 Fe2Ni2V 0.1 Si 0.05 It has a single FCC phase structure. Its hardness is only 127 HV, resulting in severely insufficient strength, although its corrosion resistance is slightly better (0.626 μA / cm). 2 However, it is completely unable to meet the requirements of high-load structural components.

[0049] Example 3: Alloy AlCoFe2Ni2Si 0.05 Preparation of .

[0050] The preparation method is exactly the same as in Example 1, except that the raw material ratio is changed and Co is used instead of V to make the composition AlCoFe2Ni2Si. 0.05 .

[0051] Test results show that the AlCoFe2Ni2Si alloy prepared in this embodiment... 0.05 A dual-phase FCC+BCC structure is formed. Its hardness (338 HV) and corrosion resistance (0.923 μA / cm²) are... 2 The values ​​are all significantly lower than those of the alloy in Example 1, and the raw material cost is higher due to the presence of Co.

[0052] To verify the comprehensive performance of the alloy of the present invention, detailed microstructure characterization, mechanical property testing and corrosion resistance evaluation were carried out on the alloy samples prepared in Examples 1 to 3.

[0053] 1. Microstructure characterization.

[0054] The phase composition of the alloy was analyzed using X-ray diffraction (XRD). The test conditions were: Cu Kα radiation (λ = 0.15406 nm), tube voltage 40 kV, tube current 40 mA, scan range 20°–90°, scan step size 0.02°, and scan speed 4° / min. The obtained XRD patterns are shown below. Figure 1 , 2 As shown in Figure 3. The results show that the alloy AlFe2Ni2VSi in Example 1... 0.05 It has a single BCC phase structure, while the alloy Al in Example 2 0.1 Fe2Ni2V 0.1 Si 0.05 The alloy AlCoFe2Ni2Si in Example 3 is an FCC phase. 0.05 It has an FCC+BCC dual-phase structure.

[0055] 2. Hardness test.

[0056] Hardness is a key mechanical property indicator for measuring a material's resistance to localized plastic deformation. This invention uses Vickers Hardness (HV) to evaluate the hardness of alloys. This method produces small indentations, causes minimal damage to the sample, and is highly accurate, making it very suitable for testing high-hardness materials.

[0057] The test method is described in detail below: The testing equipment used was a standard Vickers hardness tester (model: HVS-1000).

[0058] Sample preparation: The metallographic samples prepared in Examples 1 to 3 (i.e., after grinding and polishing to a mirror finish) are used as test objects to ensure that the test surface is smooth, free of scratches and contamination.

[0059] Test parameters: The test force (Load) is selected as 4.903 N (500 gf). This load is sufficient to produce a clear and accurately measurable indentation on high-hardness materials, while avoiding measurement errors caused by indentations that are too large or too small.

[0060] The dwell time is 15 seconds. This ensures that the load is applied sufficiently and the material deformation is fully stabilized to obtain an accurate reading.

[0061] The indenter uses a regular square pyramidal diamond indenter with two opposing faces at an angle of 136°.

[0062] Test procedure: At least 5 different points are randomly selected on the surface of each sample for indentation testing. The distance between each indentation is at least 3 times the length of the diagonal of the indentation to avoid mutual interference between work-hardened areas.

[0063] Data Processing: The lengths of the two diagonals of each indentation are measured using the built-in optical measurement system or accompanying software of the hardness tester. The average value is then taken, and the hardness value (HV) is automatically calculated according to the Vickers hardness calculation formula. The final reported hardness value is the arithmetic mean of at least 5 valid measurement points. The hardness test curves of the ingots in Examples 1-3 are shown below. Figures 4-6 As shown in the figure. The results show that the average Vickers hardness values ​​of the ingots in Examples 1-3 are 575 HV, 127 HV ​​and 338 HV, respectively.

[0064] 3. Tafel electrochemical polarization test.

[0065] Corrosion current density (icorr) is a core electrochemical parameter for evaluating the resistance of metallic materials to uniform corrosion. The lower the value, the slower the corrosion rate and the better the corrosion resistance. This invention uses the Tafel extrapolation method to obtain this parameter through potentiodynamic polarization testing.

[0066] The test method is described in detail below: The testing equipment uses an electrochemical workstation in conjunction with a standard three-electrode electrolytic cell system.

[0067] Electrode system: Working Electrode (WE): The alloy sample to be tested, with an exposed area of ​​1 cm². 2 The remaining parts are sealed and insulated with epoxy resin.

[0068] Reference Electrode (RE): Saturated calomel electrode (SCE). All potentials reported are relative to this reference electrode.

[0069] Counter Electrode (CE): Platinum sheet electrode or graphite electrode.

[0070] Electrolyte: A 3.5 wt.% sodium chloride (NaCl) aqueous solution was used to simulate a typical neutral marine atmospheric and seawater corrosion environment. The solution was prepared from analytical grade NaCl and deionized water, and the test temperature was room temperature (25 ± 1 ℃).

[0071] Test steps: Open-circuit potential (OCP) monitoring: Immerse the working electrode in the electrolyte and continuously monitor its open-circuit potential until it stabilizes for at least 10 minutes to ensure that the system reaches a quasi-steady state. The stable open-circuit potential is the basis for effective polarization testing.

[0072] Polarization scan: Starting from the stable open-circuit potential, perform a potentiodynamic polarization scan.

[0073] Scan range: Relative to the open-circuit potential, scan from -250 mV (cathodic direction) to +250 mV (anodic direction).

[0074] Scan rate: 0.166 mV / s (i.e., 10 mV / min). This slow scan helps the polarization curve approach the steady state and ensures the accuracy of the Tafel extrapolation results.

[0075] Data analysis: After the test, use the analysis software provided with the electrochemical workstation to perform a fitting analysis on the obtained polarization curve. The software linearly extrapolates the anodic and cathodic Tafel segments in the strong polarization region, and the abscissa value corresponding to the intersection point is the self-corrosion current density (icorr). The TAFEL electrochemical polarization curves of the alloys in Examples 1 to 3 are respectively as Figures 7-9 shown.

[0076] The phase structures, hardness, and electrochemical corrosion test results of the alloys in Examples 1 to 3 are shown in Table 1 below.

[0077] Table 1 Phase structures, hardness, and electrochemical corrosion test results of the alloys in Examples 1 to 3

[0078] As can be seen from Table 1, the corrosion current density of the alloy AlFe2Ni2VSi in Example 1 of the present invention 0.05 is as low as 0.864 μA / cm 2 , far lower than that in Example 3 (AlCoFe2Ni2Si 0.05 , 0.923 μA / cm 2 ), and although slightly higher than that in Example 2 (Al 0.1 Fe2Ni2V 0.1 Si 0.05 , 0.626 μA / cm 2 ), considering that its hardness far exceeds that in Example 2, therefore, the alloy in Example 1 of the present invention exhibits incomparable superiority in the comprehensive balance of hardness and corrosion resistance.

[0079] A comparison of Example 2 and Example 1 shows that as the Al and V contents decrease, even if the alloy contains Si, the alloy changes from a BCC phase to a soft FCC phase, completely losing its high hardness. A comparison of Example 3 and Example 1 shows that after replacing V with Co, the system cannot form a single BCC phase, becoming a mediocre two-phase structure, and its corrosion resistance decreases.

[0080] In summary, the AlFe2Ni2VSi alloy prepared in Example 1 of this invention... 0.05 With its unique as-cast single BCC phase structure, it successfully achieves a perfect combination of ultra-high hardness and excellent corrosion resistance. Moreover, its preparation process is simple and its performance far exceeds that of the alloys in the other two embodiments, which fully demonstrates the advanced nature, effectiveness and uniqueness of the composition design and preparation method of this invention.

[0081] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance, characterized in that, Its alloy composition includes Al, Fe, Ni, V and Si; the molar ratio of Al, Fe, Ni, V and Si is 1:2:2:1:0.

05.

2. The high-hardness and high-corrosion-resistance single-phase BCC structure high-entropy alloy according to claim 1, characterized in that, The high-entropy alloy has a Vickers hardness of not less than 575 HV and a corrosion current density of not more than 0.864 μA / cm. 2 .

3. A method for preparing a single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance, characterized in that, Includes the following steps: (1) Calculate and weigh high-purity bulk Al, Fe, Ni, V and Si as metal raw materials according to the atomic ratio Al:Fe:Ni:V:Si = 1:2:2:1:0.05; (2) Place the metal raw materials into the water-cooled copper crucible of the vacuum arc melting furnace in the order of Si, Al, V, Ni, Fe; (3) Evacuate the smelting furnace and fill it with protective gas; (4) Arc ignition melting of metal raw materials: After all the metals have been completely melted, the electromagnetic stirring system is turned on to promote the convection of the melt, and then it is quickly solidified into ingots; (5) Turn the alloy ingot over and repeat step (4) several times to obtain a single-phase BCC structure high-entropy alloy with high hardness and high corrosion resistance.

4. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, Step (3) Evacuate the melting furnace to a vacuum level ≤ 5.0×10 -3 Pa.

5. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, Step (3) Argon gas is introduced into the melting furnace as a protective gas until the pressure is slightly lower than atmospheric pressure.

6. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, In step (4), when smelting, first adjust the arc starting current to 80-100 A, and after the arc stabilizes, increase the smelting current to 300-350 A.

7. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, In step (4), after all the metals have completely melted and formed a bright molten pool, turn on the electromagnetic stirring system and set the stirring intensity to 70-80% to promote the convection of the melt. The stirring time should be no less than 3 minutes.

8. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, Step (4) is repeated at least 5 times in step (5).

9. The method for preparing a high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 3, characterized in that, in Before the metal raw materials are smelted by arc in step (4), the titanium getter is first smelted by arc in order to absorb the residual oxygen, nitrogen and moisture in the furnace.

10. The high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy according to claim 1 or 2, or the high-hardness and high-corrosion-resistant single-phase BCC structure high-entropy alloy prepared by the method according to any one of claims 3 to 9, is used to manufacture components that withstand high mechanical loads in corrosive environments.

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