High-entropy alloy shielding material and preparation method thereof

Abstract

The invention relates to the technical field of shielding materials, in particular to a high-entropy alloy shielding material and a preparation method thereof. The high-entropy alloy comprises, by mass, 22-30% of Fe, 28-40% of Ni, 20-30% of W, 3-10% of Al and 1-3% of B, the sum of the weight percentages of the components is 100%, the high-entropy alloy further comprises inevitable impurity elements, and the content of the impurity elements is smaller than 1%. A tungsten-boron phase is distributed in a base phase of the high-entropy alloy, and the size of the tungsten-boron phase is 5-20 microns; and the alloy system criterion of the high-entropy alloy is omega = Tm delta Smix / delta Hmix > 1. Tungsten and boron are adopted as main shielding functional elements, rare earth elements prone to generating induced radioactivity are not contained, and shielding engineering design is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of shielding materials, and in particular to a high entropy alloy shielding material and a preparation method thereof. Background Art

[0002] Ionizing radiation has strong penetrability and requires the use of shielding materials for protection. Neutrons and gamma rays are the main targets of radiation protection, but the absorption principles of the two are different, and different functional elements are needed for protection. Neutrons need to interact with elements with large absorption cross-sections. Commonly used neutron absorbing elements include boron, samarium, gadolinium, cadmium, etc.; gamma photons need to collide with high atomic number elements to achieve energy attenuation. Commonly used gamma absorbing elements are mainly tungsten, lead, iron, etc. With the development of nuclear technology, radiation protection scenarios have become increasingly complex. Shielding materials with a single material or a single functional element added can no longer meet the needs of radiation protection. The addition of multiple functional elements often introduces a large number of second phases, which deteriorates the process performance and mechanical properties of the material and becomes an obstacle to the development of new shielding materials.

[0003] The concept of high entropy alloys (HEAs) provides a new idea for the development of complex alloys. HEAs are alloys composed of five or more metals and alloying elements. Traditionally, HEAs are composed of five or more elements in equiatomic or nearly equiatomic ratios. Their phase composition is relatively simple and has four typical effects: high entropy effect, lattice distortion effect, hysteresis diffusion effect, and material performance "cocktail" effect. HEAs have gradually become a new material with great application prospects in the fields of aerospace, defense industry, nuclear energy, etc. due to their many advantages such as high mechanical properties, corrosion resistance, and high temperature resistance.

[0004] Mechanical alloying (MA) is one of the main preparation methods of HEAs. Under the action of high-speed ball milling equipment, metal powders mixed in a certain proportion are fully mixed and repeatedly deformed, cold welded, fractured and cold welded again to form alloy powders with uniform composition distribution, similar structure and performance. The alloy powders are compacted and sintered to obtain bulk alloys. Due to its solid-state alloying characteristics, the MA method can easily obtain fine grain size, avoiding the refractory material pollution problem caused by liquid alloying methods such as smelting methods, and the obtained alloy has strong stability and uniformity.

[0005] The Chinese patent publication number is CN 114525451A, which discloses a high entropy alloy steel. In order to improve its mechanical properties and corrosion resistance, a variety of rare earth elements are added, but the problem of induced radiation and generation of gamma particles by rare earth elements such as Gd under the action of thermal neutrons is ignored; the invented alloy structure contains a large number of blocky and needle-shaped brittle precipitation phases, which will deteriorate the plasticity and toughness of the material.

[0006] The Chinese patent publication number is CN 114990407A, which discloses an equiatomic ratio high entropy alloy with a boron content of up to 11wt%, far exceeding the shielding design requirements and deteriorating the mechanical properties of the material. The current high entropy shielding material design has not really solved the contradiction between high entropy alloy design and the complex application scenarios of shielding materials.

[0007] The Chinese patent publication number is CN 118497584A, which discloses a structural and functional integrated shielding high-entropy alloy and its preparation method. Based on the high solid solubility of high-entropy alloys, a Gd-doped high-entropy alloy material was prepared using a small vacuum arc furnace. Its W and Ta content is only 3-6%, and its shielding ability against gamma rays is limited.

[0008] Based on the above facts, due to the complex working scenarios of radiation protection, different functional elements are needed to protect against multiple rays. The existing technology has failed to solve the functional selection and matching problems of added elements of high entropy shielding materials, resulting in uneven alloy material structure, imperfect shielding function, and the presence of rare earth element induced radiation. Summary of the invention

[0009] In order to solve the problems of uneven alloy material structure, imperfect shielding function, rare earth element induced radiation and the like in the prior art, the present invention provides a high entropy alloy shielding material and a preparation method thereof.

[0010] According to a first aspect of the present invention, the present invention provides a high entropy alloy shielding material, comprising, by mass percentage:

[0011] 22-30wt% Fe, 28-40wt% Ni, 20-30wt% W, 3-10wt% Al and 1-3wt% B, the sum of the weight percentages of the above components is 100%, which also includes inevitable impurity elements, and the content of the impurity elements is less than 1%; the base phase of the high entropy alloy is distributed with a tungsten-boron phase, and the size of the tungsten-boron phase is 5-20μm;

[0012] The alloy system criterion of the high entropy alloy is Ω=T m ΔS mix / |ΔH mix |>1;

[0013] Among them, Ω is the alloy system criterion, T m is the melting point of the alloy, ΔH mix is the sum of the mixing enthalpies of binary alloys calculated based on first-principles calculations, ΔS mix is the sum of the mixed entropy of each element.

[0014] According to one embodiment of the present invention, it is characterized in that the content of Fe is 28-30wt%, the content of Ni is 34-40wt%, the content of W is 22-29wt%, the content of Al is 5-8wt% and the content of B is 1-3wt%.

[0015] According to one embodiment of the present invention, the content of Fe is 28 wt %, the content of Ni is 39 wt %, the content of W is 22 wt %, the content of Al is 7 wt % and the content of B is 1 wt %.

[0016] According to a second aspect of the present invention, the present invention provides a method for preparing a high entropy alloy shielding material, comprising the following steps:

[0017] Provide a raw material of the high entropy alloy shielding material comprising iron powder, nickel-boron alloy powder and aluminum-tungsten alloy powder;

[0018] The raw material is subjected to a first grinding to obtain a first alloy powder;

[0019] The first alloy powder is subjected to a second grinding to obtain a second alloy powder;

[0020] The second alloy powder is pressed and formed into a blank;

[0021] The blank is sintered in a protective gas to obtain a high entropy alloy with a tungsten-boron phase distribution in the base phase.

[0022] According to one embodiment of the present invention, the first grinding comprises:

[0023] The first grinding is a first ball mill, the rotation speed of the first ball mill is 100-150 r / min, the time of the first ball mill is greater than 1 hour, and the ball-to-material ratio of the first ball mill is 6:1-8:1.

[0024] According to one embodiment of the present invention, the second grinding comprises:

[0025] The second grinding is a second ball mill, the rotation speed of the second ball mill is 320-500 r / min, the time of the second ball mill is 36-70 hours, and the ball-to-material ratio of the second ball mill is 6:1-8:1.

[0026] According to one embodiment of the present invention, the pressure forming comprises:

[0027] The pressure applied to the second alloy powder is 20-40 MPa.

[0028] According to one embodiment of the present invention, the sintering comprises:

[0029] The sintering temperature is 1390-1510° C., and the sintering heat preservation time is 2-4 hours.

[0030] According to an embodiment of the present invention, the particle size of the raw material is 50-200 μm, and the particle size of the second alloy powder is 40-140 μm.

[0031] According to one embodiment of the present invention, the protective gas is an inert gas.

[0032] The present invention has the following beneficial effects:

[0033] 1. The present invention adopts a non-equiatomic ratio alloy composition design, does not contain rare earth elements that are prone to induced radioactivity, uses tungsten elements to shield gamma rays, and uses boron elements to absorb neutrons, which has a good composite shielding effect. The high entropy alloy shielding material designed by the present invention is prepared by mechanical alloying-pressureless sintering process, has uniform structure, simple process, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The SEM organization diagram of the high entropy alloy shielding material of Example 1 is shown;

[0035] Figure 2 The XRD spectrum of the high entropy alloy shielding material after sintering in Example 1 is shown;

[0036] Figure 3 The XRD spectrum of the high entropy alloy shielding material of Example 1 before sintering is shown;

[0037] Figure 4 The SEM structure of the alloy material of Comparative Example 1 after sintering is shown. DETAILED DESCRIPTION

[0038] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0039] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components.

[0040] According to the first aspect of the present invention, this embodiment discloses a high entropy alloy shielding material, such as Figure 1As shown, according to the mass percentage, it includes:

[0041] 22-30wt% Fe, 28-40wt% Ni, 20-30wt% W, 3-10wt% Al and 1-3wt% B, the sum of the weight percentages of the above components is 100%, which also includes inevitable impurity elements, and the content of the impurity elements is less than 1%; the base phase of the high entropy alloy is distributed with a tungsten-boron phase, and the size of the tungsten-boron phase is 5-20μm;

[0042] The alloy system criterion of the high entropy alloy is Ω=T m ΔS mix / |ΔH mix |>1;

[0043] Among them, Ω is the alloy system criterion, T m is the melting point of the alloy, ΔH mix is the sum of the mixing enthalpies of binary alloys calculated based on first-principles calculations, ΔS mix is the sum of the mixed entropy of each element.

[0044] Preferably, the alloy system criterion of the high entropy alloy is Ω=T m ΔS mix / |ΔH mix |=1.2-1.4, more preferably, the alloy system criterion of the high entropy alloy Ω=T m ΔS mix / |ΔH mix |=1.24-1.34.

[0045] In this embodiment, a high entropy alloy shielding material contains five elements, namely, Fe, W, Ni, Al, and B. A non-equiatomic ratio element design method is adopted, and the sum of the contents of each element is 100%.

[0046] Boron has a large thermal neutron absorption cross section, and its absorption reaction is a (n, α) reaction. Compared with rare earth elements Gd and Sm, it does not produce secondary gamma rays that are difficult to protect, and is an excellent neutron absorbing element. In traditional iron-based materials, the addition of a large amount of boron will lead to the formation of brittle boron phases, deteriorating the mechanical properties of the materials, thus limiting the progress of boron-containing neutron absorbing materials. The lattice distortion effect and high entropy effect of high-entropy alloys are conducive to the improvement of the solid solubility of boron elements and inhibit the precipitation of boron-containing phases.

[0047] Aluminum is a commonly used light alloy element with a low melting point and an FCC structure. The addition of aluminum is beneficial to increasing the entropy value of the alloy system and improving the stability of the FCC (face-centered cubic) structure.

[0048] Tungsten has good gamma-ray shielding ability. The addition of tungsten can give the material gamma-ray shielding function through the cocktail effect of high entropy alloy.

[0049] The alloy composition is designed using the alloy system Ω criterion to reduce the precipitation of W and B elements, thereby increasing the matrix solid solubility. In this embodiment, Ω = T m ΔS mix / |ΔH mix |>1, where T m is the melting point of the alloy, ΔH mix is the sum of the binary alloy mixing enthalpies obtained by first-principles calculations. The binary alloy mixing enthalpies are shown in Table 1. ΔS mix is the sum of the mixed entropy of each element.

[0050]

[0051] Table 1 Mixing enthalpy of binary alloys

[0052] Al B Fe Ni W Al —— 0 -11 -22 -2 B —— -26 -24 -31 Fe —— -2 0 Ni —— -3 W ——

[0053] It can be seen from Table 1 that the mixing enthalpy of Al element and B element is 0, the mixing enthalpy of Al element and Fe element is -11, the mixing enthalpy of Al element and Ni element is -22, the mixing enthalpy of Al element and W element is -2, the mixing enthalpy of B element and Fe element is -26, the mixing enthalpy of B element and Ni element is -24, the mixing enthalpy of B element and W element is -31, the mixing enthalpy of Fe element and Ni element is -2, the mixing enthalpy of Fe element and W element is 0, and the mixing enthalpy of Ni element and W element is -3.

[0054] In the present invention, the first ball milling and the second ball milling are for the convenience of distinguishing the two ball milling steps, and the first and second ball millings are selected to distinguish the two ball millings for the convenience of understanding.

[0055] According to one embodiment of the present invention, the content of Fe is 28-30wt%, the content of Ni is 34-40wt%, the content of W is 22-29wt%, the content of Al is 5-8wt% and the content of B is 1-3wt%.

[0056] According to one embodiment of the present invention, the content of Fe is 28 wt %, the content of Ni is 39 wt %, the content of W is 22 wt %, the content of Al is 7 wt % and the content of B is 1 wt %.

[0057] According to a second aspect of the present invention, this embodiment discloses a method for preparing a high entropy alloy shielding material, comprising the following steps:

[0058] Providing a raw material of a high entropy alloy shielding material having a designed composition such as the above-mentioned iron powder, nickel-boron alloy powder and aluminum-tungsten alloy powder;

[0059] The raw material is subjected to a first grinding to obtain a first alloy powder;

[0060] The first alloy powder is subjected to a second grinding to obtain a second alloy powder;

[0061] The second alloy powder is pressed and formed into a blank;

[0062] The blank is sintered in a protective gas to obtain a high entropy alloy with a tungsten-boron phase distribution in the base phase.

[0063] In this embodiment, the effect of tungsten on mechanical properties is different from that of boron. The high melting point of tungsten causes excess elemental tungsten to precipitate preferentially, forming gravity segregation, resulting in uneven macroscopic composition of the material. It is necessary to start from the preparation process to reduce the impact of tungsten segregation.

[0064] According to one embodiment of the present invention, the first grinding comprises:

[0065] The first grinding is a first ball mill, the rotation speed of the first ball mill is 100-150 r / min, the time of the first ball mill is greater than 1 hour, and the ball-to-material ratio of the first ball mill is 6:1-8:1.

[0066] According to one embodiment of the present invention, the second grinding comprises:

[0067] The second grinding is a second ball mill, the rotation speed of the second ball mill is 320-500 r / min, the time of the second ball mill is 36-70 hours, and the ball-to-material ratio of the second ball mill is 6:1-8:1.

[0068] According to one embodiment of the present invention, the pressure forming comprises:

[0069] The pressure applied to the second alloy powder is 20-40 MPa.

[0070] According to one embodiment of the present invention, the sintering comprises:

[0071] The sintering temperature is 1390-1510° C., and the sintering heat preservation time is 2-4 hours.

[0072] In this embodiment, the density of the high entropy alloy after sintering is ensured by appropriate temperature control.

[0073] According to an embodiment of the present invention, the particle size of the raw material is 50-200 μm, and the particle size of the second alloy powder is 40-140 μm.

[0074] According to one embodiment of the present invention, the protective gas is an inert gas.

[0075] In this embodiment, the inert gas is argon to prevent the alloy from being oxidized during the sintering process.

[0076] Example 1

[0077] The high entropy alloy shielding material is prepared as follows:

[0078] (1) In terms of mass percentage, the alloy composition is 28.41wt% Fe, 39.77wt% Ni, 22.72wt% W, 7.95wt% Al and 1.14wt% B, the sum of the contents of each element is 100%, including unavoidable impurity elements, the contents of which are all less than 1%; the alloy system Ω = T m ΔS mix / |ΔH mix |=1.34.

[0079] (2) The raw materials used are iron powder, nickel-boron master alloy powder, and aluminum-tungsten master alloy powder, and the particle size of the raw material powder is 50 to 200 μm;

[0080] (3) weighing the raw materials according to the designed composition, putting them into a ball mill for mixing and pre-grinding, the ball mill speed is 100 r / min, the ball milling time is 1 h, and the ball-to-material ratio is 6:1, to obtain the first alloy powder;

[0081] (4) mechanically alloying the first alloy powder material, with a ball mill speed of 320 r / min, a ball milling time of 60 h, and a ball-to-material ratio of 6:1, to obtain a second alloy powder, the particle size of the second alloy powder being 40 to 140 μm;

[0082] (5) pre-pressing the second alloy powder under a pressure of 20 MPa to obtain a blank;

[0083] (6) The blank was sintered by a pressureless sintering process in an argon protective gas atmosphere at a sintering temperature of 1510°C and a holding time of 2 h to obtain a high entropy alloy shielding material.

[0084] The high entropy alloy sample prepared in this embodiment has a shielding effect. The SEM structure and XRD diagram of the high entropy alloy sample prepared in this embodiment are as follows: Figure 1 and Figure 2 As shown, the XRD pattern of the blank is as follows Figure 3 As shown, Figure 1 The alloy matrix in the shielding device is a highly solid-solution FCC (face-centered cubic) structure, and the tungsten-boron phase is evenly dispersed on the matrix with a size of about 5 to 20 μm, which is convenient for meeting the material uniformity requirements in shielding design and is not prone to beam leakage.

[0085] Example 2

[0086] The high entropy alloy shielding material is prepared as follows:

[0087] (1) In terms of mass percentage, the alloy composition is 28.41wt% Fe, 39.77wt% Ni, 22.72wt% W, 7.95wt% Al and 1.14wt% B, the sum of the contents of each element is 100%, and also includes unavoidable impurity elements, the contents of which are all less than 1%; alloy system Ω = T m ΔS mix / |ΔH mix |=1.34.

[0088] (2) The raw materials used in the present invention are iron powder, nickel-boron master alloy powder, and aluminum-tungsten master alloy powder, and the particle size of the raw material powder is 50 to 200 μm;

[0089] (3) weighing the raw materials according to the designed composition, putting them into a ball mill for mixing and pre-grinding, the ball mill speed is 100 r / min, the ball milling time is 1 h, and the ball-to-material ratio is 7:1, to obtain the first alloy powder;

[0090] (4) mechanically alloying the first alloy powder material, with a ball mill speed of 320 r / min, a ball milling time of 36 h, and a ball-to-material ratio of 7:1, to obtain a second alloy powder, the particle size of the second alloy powder being 40 to 140 μm;

[0091] (5) pre-pressing the second alloy powder under a pressure of 40 MPa to obtain a blank;

[0092] (6) The blank was sintered by a pressureless sintering process in an argon protective gas atmosphere at a sintering temperature of 1390°C and a holding time of 4 h to obtain a high entropy alloy shielding material.

[0093] Example 3

[0094] The high entropy alloy shielding material is prepared as follows:

[0095] (1) In terms of mass percentage, the alloy composition is 29.54wt% Fe, 34.01wt% Ni, 28.49wt% W, 5.68wt% Al and 2.28wt% B, the sum of the contents of each element is 100%, including unavoidable impurity elements, the contents of which are all less than 1%; alloy system Ω = T m ΔS mix / |ΔH mix |=1.24.

[0096] (2) The raw materials used in the present invention are iron powder, nickel-boron master alloy powder, and aluminum-tungsten master alloy powder, and the particle size of the raw material powder is 50 to 200 μm;

[0097] (3) weighing the raw materials according to the designed composition, putting them into a ball mill for mixing and pre-grinding, the ball mill speed is 150 r / min, the ball milling time is 1 h, and the ball-to-material ratio is 7.5:1, to obtain the first alloy powder;

[0098] (4) mechanically alloying the first alloy powder material, with a ball mill speed of 500 r / min, a ball milling time of 70 h, and a ball-to-material ratio of 7.5:1, to obtain a second alloy powder, the particle size of the second alloy powder being 40 to 140 μm;

[0099] (5) pre-pressing the second alloy powder under a pressure of 30 MPa to obtain a blank;

[0100] (6) The blank was sintered by a pressureless sintering process in an argon protective gas atmosphere at a sintering temperature of 1410°C and a holding time of 4 h to obtain a high entropy alloy shielding material.

[0101] Example 4

[0102] The high entropy alloy shielding material is prepared as follows:

[0103] (1) In terms of mass percentage, the alloy composition is 29.54wt% Fe, 34.01wt% Ni, 28.49wt% W, 5.68wt% Al and 2.28wt% B, the sum of the contents of each element is 100%, including unavoidable impurity elements, the contents of which are all less than 1%; alloy system Ω = T m ΔS mix / |ΔH mix |=1.24.

[0104] (2) The raw materials used in the present invention are iron powder, iron-boron master alloy powder, and aluminum-tungsten master alloy powder, and the particle size of the raw material powder is 50 to 200 μm;

[0105] (3) Weighing the raw materials according to the designed composition, putting them into a ball mill for mixing and pre-grinding, the ball mill speed is 150 r / min, the ball milling time is 1 h, and the ball-to-material ratio is 8:1, to obtain the first alloy powder;

[0106] (4) mechanically alloying the first alloy powder material, with a ball mill speed of 500 r / min, a ball milling time of 70 h, and a ball-to-material ratio of 8:1, to obtain a second alloy powder, the particle size of the second alloy powder being 40 to 140 μm;

[0107] (5) pre-pressing the second alloy powder under a pressure of 30 MPa to obtain a blank;

[0108] (6) The blank was sintered by a pressureless sintering process in an argon protective gas atmosphere at a sintering temperature of 1430°C and a holding time of 3 h to obtain a high entropy alloy shielding material.

[0109] Comparative Example 1

[0110] The high entropy alloy shielding material is prepared as follows:

[0111] (1) In terms of mass percentage, the alloy composition is 28.41wt% Fe, 39.77wt% Fe, 22.72wt% W, 7.95wt% Al and 1.14wt% B, the sum of the contents of each element is 100%, including unavoidable impurity elements, the contents of which are all less than 1%; the alloy system Ω = T m ΔS mix / |ΔH mix |=1.34.

[0112] (2) The raw materials used in the present invention are iron powder, nickel-boron master alloy powder, and aluminum-tungsten master alloy powder, and the particle size of the raw material powder is 50 to 200 μm;

[0113] (3) weighing the raw materials according to the designed composition, putting them into a ball mill for mixing and pre-grinding, the ball mill speed is 100 r / min, the ball milling time is 1 h, and the ball-to-material ratio is 6:1, to obtain the first alloy powder;

[0114] (4) mechanically alloying the first alloy powder material, with a ball mill speed of 320 r / min, a ball milling time of 60 h, and a ball-to-material ratio of 6:1, to obtain a second alloy powder, the particle size of the second alloy powder being 40 to 140 μm;

[0115] (5) pre-pressing the second alloy powder under a pressure of 30 MPa to obtain a blank;

[0116] (6) The blank was sintered by pressureless sintering process in an argon protective gas atmosphere at a sintering temperature of 1250°C and a holding time of 2 h to obtain an alloy sample.

[0117] The SEM microstructure of the alloy sample prepared in the comparative example is as follows Figure 4 As shown, the matrix is ​​not completely dense and there are a large number of voids. The raw material composition and powder preparation process of Comparative Example 1 are exactly the same as those of Example 1, but due to the low sintering temperature, the matrix is ​​not completely dense and there are a large number of voids.

[0118] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A high entropy alloy shielding material, characterized in that: In terms of mass percentage, it includes: 22-30wt% Fe, 28-40wt% Ni, 20-30wt% W, 3-10wt% Al and 1-3wt% B, the sum of the weight percentages of the above components is 100%; the base phase of the high entropy alloy is distributed with a tungsten-boron phase, and the size of the tungsten-boron phase is 5-20 μm; The alloy system criterion of the high entropy alloy is Ω=T m ΔS mix / |ΔH mix |>1; Among them, Ω is the alloy system criterion, T m is the melting point of the alloy, ΔH mix is the sum of the mixing enthalpies of binary alloys calculated based on first-principles calculations, ΔS mix is the sum of the mixed entropy of each element.

2. A high entropy alloy shielding material according to claim 1, characterized in that: The content of Fe is 28-30 wt%, the content of Ni is 34-40 wt%, the content of W is 22-29 wt%, the content of Al is 5-8 wt% and the content of B is 1-3 wt%.

3. A high entropy alloy shielding material according to claim 1, characterized in that: The content of Fe was 28 wt %, the content of Ni was 39 wt %, the content of W was 22 wt %, the content of Al was 7 wt % and the content of B was 1 wt %.

4. A method for preparing a high entropy alloy shielding material, characterized in that: The steps include: Provide a raw material of a high entropy alloy shielding material as described in any one of claims 1 to 3, including iron powder, nickel-boron alloy powder and aluminum-tungsten alloy powder; The raw material is subjected to a first grinding to obtain a first alloy powder; The first alloy powder is subjected to a second grinding to obtain a second alloy powder; The second alloy powder is pressed and formed into a blank; The blank is sintered in a protective gas to obtain a high entropy alloy with a tungsten-boron phase distribution in the base phase.

5. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The first grinding comprises: The first grinding is a first ball mill, the rotation speed of the first ball mill is 100-150 r / min, the time of the first ball mill is greater than 1 hour, and the ball-to-material ratio of the first ball mill is 6:1-8:

1.

6. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The second grinding comprises: The second grinding is a second ball mill, the rotation speed of the second ball mill is 320-500 r / min, the time of the second ball mill is 36-70 hours, and the ball-to-material ratio of the second ball mill is 6:1-8:

1.

7. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The pressure forming comprises: The pressure applied to the second alloy powder is 20-40 MPa.

8. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The sintering comprises: The sintering temperature is 1390-1510° C., and the sintering heat preservation time is 2-4 hours.

9. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The particle size of the raw material is 50-200 μm, and the particle size of the second alloy powder is 40-140 μm.

10. The method for preparing a high entropy alloy shielding material according to claim 4, characterized in that: The protective gas is an inert gas.

Images