Seawater-corrosion-resistant single-phase quinary non-noble metal high-entropy alloy for electromagnetic shielding

Abstract

The invention discloses a seawater-corrosion-resistant single-phase quinary non-noble metal high-entropy alloy for electromagnetic shielding, and belongs to the technical field of magnetic high-entropy alloy materials. The preparation raw materials of the high-entropy alloy comprise a Fe-Co-Cr-Ni series medium-entropy alloy and a non-noble metal element; the preparation method comprises the following steps: (1) uniformly mixing entropy alloy powder and non-noble metal powder in the Fe-Co-Cr-Ni system; and (2) loading into a vacuum tube furnace, introducing high-purity argon gas into the furnace, raising the temperature, keeping heating, keeping cooling, cooling to room temperature, and screening, thereby obtaining the high-purity carbon-based composite material. The Fe-Co-Cr-Ni-X series pentabasic high-entropy alloy with high Curie temperature and low saturation magnetization is prepared with low cost, large scale and high efficiency through non-noble metal element (X = Al, Mn or Cu) doping in combination with heat treatment and a rapid cooling process on the basis of high-entropy alloy phase-entropy cooperative regulation and control, conversion from double phases to single phases and good thermal stability are achieved, and the preparation method has the advantages of high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature, high Curie temperature and high Curie temperature. The cable has seawater corrosion resistance and electromagnetic interference shielding performance, and is suitable for electromagnetic protection requirements in specific environments.

Description

Technical Field

[0001] This invention relates to the field of magnetic high-entropy alloy materials technology, and more specifically to a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding. Background Technology

[0002] As a promising future alloy system, high-entropy alloys (HEAs, or multi-principal-element solid solution alloys) consist of five or more metallic elements in equiatomic or near-equiatomic proportions, with each element comprising between 5% and 35% of the total atomic weight. Unlike traditional alloys, high-entropy alloys do not have a single dominant metallic element; their core characteristic lies in their high mixing entropy (ΔS). mix >1.5R, where R is the gas constant). To achieve excellent magnetic properties, the Curie temperature (T) is required. c ) and saturation magnetization (M s High-entropy alloys typically require a highly disordered solid solution structure and control of lattice distortion at a low level to promote the continuous movement of magnetic domains and the orderly arrangement of magnetic moments.

[0003] On the other hand, the corrosion resistance of high-entropy alloys often relies on the hindering effect of their microstructure on dislocation movement, and on mechanisms such as high-density grain boundaries, nanoprecipitates, atomic-scale lattice distortion, or short-range order to enhance surface passivation. However, these structural features that contribute to improved corrosion resistance often disrupt long-range magnetic order or introduce magnetic scattering centers, thereby adversely affecting their magnetic properties, such as reducing their effectiveness in electromagnetic shielding and energy conversion applications. Therefore, when designing high-entropy alloys that combine excellent corrosion resistance and good soft magnetic properties, a balance must be sought in microstructure control to coordinate the competitive relationship between electro-magnetic synergy and corrosion resistance, in order to promote their development in electromagnetic applications.

[0004] In recent years, researchers have focused on overcoming the inherent contradiction between magnetic order and corrosion resistance in high-entropy alloys through multi-scale microstructure design strategies. Inspired by the concept of multi-principal element synergistic strengthening, an increasing number of high-entropy alloy studies have focused on introducing specific non-noble metal elements (such as Al, Ti, Nb, Zr, Mo, Cu, Mn, W, V, etc.) or noble metal elements (such as Pt, Pd, Au, Ir, Rh, Ru, etc.) into Fe-Co-Cr-Ni based medium-entropy alloys (MEAs). By maintaining a single-phase solid solution structure, such as face-centered cubic (FCC), body-centered cubic (BCC), or hexagonal close-packed (HCP), and combining this with precise aging heat treatment, this method is expected to simultaneously improve the magnetic order and corrosion resistance of high-entropy alloys. In addition, strategies using non-equilibrium preparation techniques (such as rapid cooling / heating, and severe plastic deformation) to control microstructure evolution and phase stability have also received widespread attention. These techniques can effectively suppress dislocation movement while maintaining the continuity of magnetic domains, providing a new path for synergistic performance optimization.

[0005] As a key foundation for developing high-performance electromagnetic shielding materials in seawater environments, the above research shows that by precisely introducing non-precious metal elements and combining them with non-equilibrium preparation processes, a synergistic improvement in electromagnetic interference shielding performance and corrosion resistance can be achieved in high-entropy alloys. Moreover, the process route is simple, efficient, and low-cost.

[0006] Therefore, how to develop a high-entropy alloy resistant to seawater corrosion for electromagnetic shielding is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding, so as to overcome the shortcomings of the prior art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding is prepared from Fe-Co-Cr-Ni medium-entropy alloys and non-precious metal elements.

[0009] Furthermore, the aforementioned non-precious metal elements are Al, Mn, or Cu.

[0010] The further beneficial effect of adopting the above is that, in the heat treatment and rapid cooling process of the Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy to achieve the transformation from two-phase to single-phase, non-noble metal elements such as Al, Mn, or Cu transform to higher valence states (e.g., Al...). 3+ Mn 3+ / Mn 4+ Cu 2+This process leads to the rearrangement of d / f electron orbitals, enhances the 3d electron delocalization of Fe / Co / Ni, reduces magnetocrystalline anisotropy, suppresses multiphase precipitation, and promotes the single-phase-high-entropy synergistic effect of FCC or BCC. The Curie temperature can reach above 350 K. After doping with Al, Mn and Cu, the saturation magnetization of the pentagonal high-entropy alloy is reduced to below 110 emu / g, respectively, to meet the specific functional magnetic requirements.

[0011] Furthermore, the chemical formula of the aforementioned seawater-resistant, corrosion-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding is Fe. 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 or Fe 21 Co 20 Cr 24 Ni 18 Cu 17 .

[0012] The further beneficial effects of the above-mentioned method are that the single-phase Fe-Co-Cr-Ni-X pentagonal non-precious metal high-entropy alloy system of the present invention can effectively suppress the precipitation of σ phase and B2 phase, realize the controllable transformation of Fe-Co-Cr-Ni-X pentagonal non-precious metal high-entropy alloy from two-phase to single-phase solid solution with a single FCC phase structure, and maintain high-temperature phase stability within 1048 K (about 775℃).

[0013] A method for preparing the above-mentioned seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding, characterized by comprising the following steps: (1) Mix the Fe-Co-Cr-Ni system entropy alloy powder and non-precious metal powder evenly to obtain the reaction material; (2) The reactants are loaded into a vacuum tube furnace, high-purity argon gas is introduced into the furnace, the temperature is raised and maintained, the temperature is cooled and maintained, the temperature is cooled to room temperature, and the mixture is sieved to obtain a seawater-resistant single-phase pentaneous non-precious metal high-entropy alloy for electromagnetic shielding.

[0014] Furthermore, in step (1) above, the purity of the Fe-Co-Cr-Ni system entropy alloy powder is ≥99.9%, the particle size is 800 mesh, and the mass percentage of Fe:Co:Cr:Ni is 24.2:24.1:29.1:22.6.

[0015] Furthermore, in step (1) above, the purity of the non-precious metal powder is ≥99.95%, and the particle size is 800-1000 mesh.

[0016] Furthermore, in step (2) above, the purity of the high-purity argon gas is ≥99.999%, the initial flow rate is 0.5 L / min, and the introduction time is 10 min.

[0017] The further beneficial effect of adopting the above method is that it reduces the oxygen content to below 50 ppm.

[0018] Furthermore, in step (2) above, the heating and holding process specifically involves heating the furnace to 1000°C at a rate of 10°C / min and holding it at this stage for 12 hours (heat treatment). During this stage, the flow rate of argon gas is 0.3 L / min.

[0019] Furthermore, in step (2) above, the cooling and holding process specifically involves cooling the furnace temperature to 800°C at a rate of 20°C / min and holding it at this stage for 6 hours (solution treatment). The flow rate of argon gas during this stage is 0.5 L / min. The cooling rate to room temperature is 30°C / min.

[0020] The further beneficial effect of the above-mentioned rapid cooling process is that the grain size can be precisely controlled by adjusting the cooling rate within the range of 20-50℃ / min, thereby obtaining a spherical structure with a grain size of 200-300 µm, and thus further optimizing its magnetic properties.

[0021] This invention also claims protection for the application of the above-described high-entropy alloy or the high-entropy alloy prepared by the above-described method in electromagnetic protection, especially in electromagnetic interference shielding in seawater environments.

[0022] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves structural control from a two-phase (FCC+BCC) to a single-phase (FCC or BCC) structure by doping a Fe-Co-Cr-Ni medium-entropy alloy with non-noble metal elements such as Al, Mn, or Cu, followed by heat treatment at 1000℃ for 12 h, air cooling to 800℃ for solution treatment for 6 h, and then rapid cooling to room temperature at a rate of 30℃ / min. The Curie temperature T of the resulting single-phase Fe-Co-Cr-Ni-X (X=Al, Mn, or Cu) pentagonal non-noble metal high-entropy alloy is... c Approximately 350 K or higher, saturation magnetization M s It exhibits good thermal stability at around 110 emu / g (63 emu / g, 112 emu / g and 27 emu / g respectively) and is resistant to seawater corrosion as well as electromagnetic interference shielding performance, which is mainly based on reflection, up to about 99.9%.

[0023] 2. This invention is based on Fe-Co-Cr-Ni medium-entropy alloys, doped with non-noble metal elements such as Al, Mn, or Cu. Through precise design of Fe-Co-Cr-Ni-X (Al, Mn, or Cu) non-noble metal high-entropy alloy systems, combined with optimized heat treatment and rapid cooling processes (solution at 900℃ + controlled cooling at 30℃ / min), the precipitation of σ and other B2 phases is suppressed, and the high-entropy + single-phase synergistic effect of stabilizing a single FCC or BCC phase is promoted. This results in a single-phase Fe-Co-Cr-Ni-X (X=Al, Mn, or Cu) pentagonal non-noble metal high-entropy alloy, while achieving a controllable transformation from two-phase to single-phase. Moreover, its high-temperature stability (1048 K) far exceeds that of traditional soft magnetic materials (such as silicon steel <873 K), which can effectively solve the limitations of the prior art.

[0024] 3. This invention is based on the phase-entropy synergistic regulation of high-entropy alloys, with precise doping of non-precious metal elements as the core, combined with a non-equilibrium preparation strategy that can be applied on a large scale. By doping non-precious metal elements (X=Al, Mn or Cu) with heat treatment and rapid cooling process, a thermally stable single-phase structure is regulated. A Fe-Co-Cr-Ni-X pentagonal high-entropy alloy with high Curie temperature and low saturation magnetization is prepared in a low-cost, large-scale and high-efficiency manner. It realizes the transformation from two-phase to single-phase and good thermal stability, significantly improves seawater corrosion resistance and electromagnetic shielding performance, and meets the electromagnetic interference shielding application requirements in marine environments.

[0025] 4. This invention achieves a balance in single-phase microstructure control by designing a non-precious metal high-entropy alloy that combines excellent seawater corrosion resistance and good soft magnetic properties. It also achieves synergistic development of seawater corrosion resistance and electromagnetic interference shielding performance. The resulting single-phase Fe-Co-Cr-Ni-X pentagonal non-precious metal high-entropy alloy exhibits a self-corrosion current of 0.65 μA / cm² in a simulated seawater environment (3.5% NaCl). 2 (X=Al), 0.40 μA / cm 2 (X=Mn) and 0.19 μA / cm 2 (X=Cu) has self-corrosion voltages of -0.23 V (X=Al), -0.21 V (X=Mn) and -0.17 V (X=Cu), and can block up to 99.95% (X=Al), 99.89% (X=Mn) and 99.87% (X=Cu) of incident electromagnetic waves.

[0026] 5. This invention achieves a controllable transition from a two-phase to a single-phase state and good thermal stability through the synergistic regulation of multiple valence states of Al, Mn, or Cu, while simultaneously realizing a high Curie temperature T. c Low saturation magnetization M sIt exhibits high-temperature phase stability and demonstrates effective electromagnetic interference shielding in simulated seawater environment (3.5% NaCl), making it widely applicable in the field of electromagnetic interference shielding in seawater environments. Attached Figure Description

[0027] Figure 1 Energy dispersive X-ray energy dispersive spectroscopy (EDS mapping) distribution and scanning electron microscopy (SEM) image of a single-phase Fe-Co-Cr-Ni-X (Al, Mn or Cu) pentagonal non-noble metal high-entropy alloy. Figure 2 In-situ X-ray diffraction (XRD) patterns for single-phase and two-phase systems of (a) Fe-Co-Cr-Ni-Al, (b) Fe-Co-Cr-Ni-Mn, and (c) Fe-Co-Cr-Ni-Cu type non-noble metal pentagonal high-entropy alloys; temperature-dependent in-situ X-ray diffraction (XRD) patterns from 298 to 1048 K for (d) Fe-Co-Cr-Ni-Al, (e) Fe-Co-Cr-Ni-Mn, and (f) Fe-Co-Cr-Ni-Cu type single-phase pentagonal non-noble metal high-entropy alloys; and X-ray photoelectron spectroscopy (XPS) patterns of (g) Al, (h) Mn, and (i) Cu non-noble metal elements after heat treatment and rapid cooling. Figure 3 Temperature-dependent magnetization (MH) curves for (a) Fe-Co-Cr-Ni-Al type, (b) Fe-Co-Cr-Ni-Mn type and (c) Fe-Co-Cr-Ni-Cu type, and Arrot plots for (d) Fe-Co-Cr-Ni-Al type, (e) Fe-Co-Cr-Ni-Mn type and (f) Fe-Co-Cr-Ni-Cu type; Figure 4 To illustrate the (a) potentiodynamic polarization curves, (b) Nyquist plots, (c) Bode plots, and (d) corrosion potential and current parameters (E) of single-phase Fe-Co-Cr-Ni-X (Al, Mn, or Cu) pentagonal non-noble metal high-entropy alloys under simulated seawater conditions (3.5% NaCl), we present the following: corr and I corr This is obtained through potentiodynamic polarization curves; Figure 5 To evaluate the (a) X-band electromagnetic interference shielding effectiveness (dB) and (b) total electromagnetic interference shielding effectiveness (SE) of a single-phase Fe-Co-Cr-Ni-X (Al, Mn, or Cu) pentagonal non-precious metal high-entropy alloy in a simulated seawater environment (3.5% NaCl). T ), reflection loss (SE) R Absorption loss (SE) A(a) reflection (R) and absorption (A), and (c) shielding efficiency. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0029] Single-phase Fe 18 Co 17 Cr 21 Ni 16 Al 28 The preparation method of a pentagonal non-precious metal high-entropy alloy specifically includes the following steps: (1) Mix Fe-Co-Cr-Ni medium entropy alloy powder and Al powder evenly to obtain the reaction material; Among them, the Fe-Co-Cr-Ni medium entropy alloy powder has a purity of ≥99.9%, a particle size of 800 mesh, and a mass percentage of Fe:Co:Cr:Ni of 24.2:24.1:29.1:22.6. The purity of Al powder is ≥99.95%, and the particle size is 1000 mesh; (2) The reactants were loaded into a vacuum tube furnace. High-purity argon gas with a purity ≥99.999% was introduced into the furnace at an initial flow rate of 0.5 L / min for 10 min to reduce the oxygen content to below 50 ppm. The furnace temperature was first raised to 1000℃ at a rate of 10℃ / min and maintained at this stage for 12 h. The argon gas flow rate during this stage was 0.3 L / min. Then the furnace temperature was cooled to 800℃ at a rate of 20℃ / min and maintained at this stage for 6 h. The argon gas flow rate during this stage was 0.5 L / min. Finally, the furnace temperature was cooled to room temperature at a rate of 30℃ / min and sieved to obtain single-phase Fe. 18 Co 17 Cr 21 Ni 16 Al 28 Five-element non-precious metal high-entropy alloy. Example 2 20 Co 19 Cr 21 Ni 17 Mn 23 The preparation method of a pentagonal non-precious metal high-entropy alloy specifically includes the following steps:

[0030] (1) Mix Fe-Co-Cr-Ni medium entropy alloy powder and Mn powder evenly to obtain the reaction material; Among them, the Fe-Co-Cr-Ni medium entropy alloy powder has a purity of ≥99.9%, a particle size of 800 mesh, and a mass percentage of Fe:Co:Cr:Ni of 24.2:24.1:29.1:22.6. The purity of Mn powder is ≥99.95%, and the particle size is 1000 mesh; (2) The reactants were loaded into a vacuum tube furnace. High-purity argon gas with a purity ≥99.999% was introduced into the furnace at an initial flow rate of 0.5 L / min for 10 min to reduce the oxygen content to below 50 ppm. The furnace temperature was first raised to 1000℃ at a rate of 10℃ / min and held at this stage for 12 h. The argon gas flow rate during this stage was 0.3 L / min. Then the furnace temperature was cooled to 800℃ at a rate of 20℃ / min and held at this stage for 6 h. The argon gas flow rate during this stage was 0.5 L / min. Finally, the furnace temperature was cooled to room temperature at a rate of 30℃ / min and sieved to obtain single-phase Fe. 20 Co 19 Cr 21 Ni 17 Mn 23 Five-element non-precious metal high-entropy alloy. Example 3

[0031] Single-phase Fe 21 Co 20 Cr 24 Ni 18 Cu 17 The preparation method of a pentagonal non-precious metal high-entropy alloy specifically includes the following steps: (1) Mix Fe-Co-Cr-Ni medium entropy alloy powder and Cu powder evenly to obtain the reaction material; Among them, the Fe-Co-Cr-Ni medium entropy alloy powder has a purity of ≥99.9%, a particle size of 800 mesh, and a mass percentage of Fe:Co:Cr:Ni of 24.2:24.1:29.1:22.6. The purity of Cu powder is ≥99.95%, and the particle size is 1000 mesh; (2) The reactants were loaded into a vacuum tube furnace. High-purity argon gas with a purity ≥99.999% was introduced into the furnace at an initial flow rate of 0.5 L / min for 10 min to reduce the oxygen content to below 50 ppm. The furnace temperature was first raised to 1000℃ at a rate of 10℃ / min and held at this stage for 12 h. The argon gas flow rate during this stage was 0.3 L / min. Then the furnace temperature was cooled to 800℃ at a rate of 20℃ / min and held at this stage for 6 h. The argon gas flow rate during this stage was 0.5 L / min. Finally, the furnace temperature was cooled to room temperature at a rate of 30℃ / min and sieved to obtain single-phase Fe. 21 Co 20 Cr 24 Ni 18 Cu 17 Five-element non-precious metal high-entropy alloy.

[0032] 1. EDS mapping and SEM characterization The single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system prepared in Examples 1-3 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 The energy dispersive X-ray spectral surface scanning (EDS mapping) distribution and high-magnification scanning electron microscopy (SEM) images of spherical non-noble metal pentagonal high-entropy alloys containing Fe, Co, Cr, Ni, Al, Fe, Co, Cr, Ni, Mn, and Fe, Co, Cr, Ni, Cu are shown in the figures below. Figure 1 As shown.

[0033] Depend on Figure 1 It can be seen that in the three systems prepared, the main elements such as Fe, Co, Cr, and Ni, as well as the dopant elements (Al, Mn, or Cu), all exhibit highly uniform distribution characteristics at the micrometer scale, with no obvious elemental segregation or compositional fluctuations observed. This uniform elemental distribution confirms the advantage of the high-entropy effect in suppressing elemental segregation. In particular, the uniform dispersion of dopant elements such as Al, Mn, and Cu in the matrix effectively avoids the precipitation of intermetallic compound phases, ensuring the structural consistency of the high-entropy alloy.

[0034] 2. FCC+BCC two-phase to single-phase control and thermal stability The single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system prepared in Examples 1-3 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 FCC+BCC two-phase to single-phase control and thermal stability, such as Figure 2 As shown.

[0035] By Figure 2 It can be seen that the phase transformation behavior of the Fe-Co-Cr-Ni-X series pentagonal non-noble metal high-entropy alloy was studied by in-situ X-ray diffraction spectroscopy analysis. Fe 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 The structural phase transformation from the initial two-phase (FCC+BCC) to the final single-phase FCC or BCC was completely achieved through heat treatment and rapid cooling processes. Based on the in-situ X-ray diffraction evolution of three non-noble metal pentagonal high-entropy alloy systems in the temperature range of 298-1048 K, the system still maintains single-phase characteristics at a high temperature of 1048 K. Through the synergistic regulation of Al, Mn and Cu, the complete transformation from two-phase (FCC+BCC) to single-phase was successfully achieved, and no phase decomposition occurred within the high temperature range of 1048 K (approximately 775 °C), confirming the excellent structural stability of the system under high-temperature conditions.

[0036] 3. Curie temperature and saturation magnetization The single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system prepared in Examples 1-3 18 Co 17 Cr 21 Ni 16Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 Curie temperature and saturation magnetization, such as Figure 3 As shown.

[0037] Depend on Figure 3 It can be seen that through the high oxidation states of Al, Mn, and Cu (such as Al) 3+ Mn 3+ / Mn 4+ Cu 2+ The modulation of electron configurations leads to rearrangement of the d / f electron orbitals in the dopant elements, enhancing the 3d electron delocalization of Fe, Co, and Ni and reducing magnetocrystalline anisotropy. This is observed in the single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system. 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 The Curie temperatures of all five alloys can reach above 350 K. Temperature-dependent magnetization (MH) curves obtained by doping with non-noble metal elements Al, Mn, and Cu show that the saturation magnetization of the pentagonal high-entropy alloys after Al, Mn, and Cu doping is approximately below 110 emu / g, meeting the requirements for specific functionalized magnetization. A moderate saturation magnetization M... s (68-110 emu / g) can achieve optimal impedance matching in the high-frequency band, and its Curie temperature T c (>350 K) Ensure the high entropy effect caused by the M-shaped curve under high temperature environment (1048 K) s and T c Collaborative design.

[0038] 4. Resistance to seawater corrosion and electromagnetic interference shielding performance The single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system prepared in Examples 1-3 18 Co 17 Cr 21Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 Its resistance to seawater corrosion and electromagnetic interference shielding performance are as follows: Figure 4-5 As shown.

[0039] Depend on Figure 4 It can be seen that the single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system Fe 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr 24 Ni 18 Cu 17 The self-corrosion current was 0.65 μA / cm under simulated seawater environment (3.5% NaCl). 2 (X = Al), 0.40 μA / cm 2 (X = Mn), and 0.19 μA / cm 2 (X = Cu), with self-corrosion voltages of -0.23 V (X = Al), -0.21 V (X = Mn), and -0.17 V (X = Cu), its seawater corrosion resistance is basically equivalent to that of duplex stainless steel 2205 as specified in the American Society for Testing and Standards (ASTM) standard for conventional materials.

[0040] Depend on Figure 5 It can be seen that the single-phase Fe-Co-Cr-Ni-X pentagonal non-noble metal high-entropy alloy system Fe 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 and Fe 21 Co 20 Cr24 Ni 18 Cu 17 Simultaneously, it can block up to 99.95% (X = Al), 99.89% (X = Mn), and 99.87% (X = Cu) of incident electromagnetic wave interference. The synergistic development of seawater corrosion resistance and electromagnetic interference shielding performance, which is mainly emission-based, meets the application requirements of electromagnetic interference shielding in seawater environments.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A seawater-resistant, single-phase, pentagonal, non-precious metal high-entropy alloy for electromagnetic shielding, characterized in that... The raw materials for preparation include Fe-Co-Cr-Ni system medium entropy alloys and non-precious metal elements.

2. The seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 1, characterized in that, The non-precious metal element is Al, Mn or Cu.

3. The seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 2, characterized in that, The chemical formula is Fe 18 Co 17 Cr 21 Ni 16 Al 28 Fe 20 Co 19 Cr 21 Ni 17 Mn 23 or Fe 21 Co 20 Cr 24 Ni 18 Cu 17 .

4. A method for preparing a seawater-resistant, single-phase, pentagonal non-precious metal high-entropy alloy for electromagnetic shielding as described in any one of claims 1-3, characterized in that, Specifically, the following steps are included: (1) Mix the Fe-Co-Cr-Ni system entropy alloy powder and non-precious metal powder evenly to obtain the reaction material; (2) The reactants are loaded into a vacuum tube furnace, high-purity argon gas is introduced into the furnace, the temperature is raised and maintained, the temperature is cooled and maintained, the temperature is cooled to room temperature, and the mixture is sieved to obtain the electromagnetic shielding seawater corrosion resistant single-phase pentaneous non-precious metal high entropy alloy.

5. The method for preparing a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 4, characterized in that, In step (1), the Fe-Co-Cr-Ni system entropy alloy powder has a purity of ≥99.9%, a particle size of 800 mesh, and a mass percentage of Fe:Co:Cr:Ni of 24.2:24.1:29.1:22.

6.

6. The method for preparing a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 4, characterized in that, In step (1), the non-precious metal powder has a purity of ≥99.95% and a particle size of 800-1000 mesh.

7. The method for preparing a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 4, characterized in that, In step (2), the purity of the high-purity argon gas is ≥99.999%, the initial flow rate is 0.5 L / min, and the introduction time is 10 min.

8. The method for preparing a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 4, characterized in that, In step (2), the heating and holding process specifically involves heating the furnace to 1000°C at a rate of 10°C / min and holding it at this temperature for 12 hours. During this stage, the flow rate of argon gas is 0.3 L / min.

9. The method for preparing a seawater-resistant single-phase pentagonal non-precious metal high-entropy alloy for electromagnetic shielding according to claim 4, characterized in that, In step (2), the cooling and holding process specifically involves cooling the furnace to 800°C at a rate of 20°C / min and holding it at this stage for 6 hours. The flow rate of argon gas during this stage is 0.5 L / min. The cooling rate to room temperature is 30°C / min.

10. The application of a high-entropy alloy as described in any one of claims 1-3 or a high-entropy alloy prepared by the preparation method as described in any one of claims 4-9 in electromagnetic protection.

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