Rare earth nickel alloy material and modeling method and preparation method thereof

Abstract

The application discloses a rare earth nickel alloy material and a modeling method and a preparation method thereof. The modeling method of the rare earth nickel alloy material comprises the following steps: S1, adopting a Monte Carlo method to calculate the content of a rare earth element; S2, dividing a nickel-based alloy into a spatial grid, and calculating the size and quantity of the spatial grid; S3, dividing the spatial grid into a planar grid layer containing grid units along the thickness direction of the rare earth nickel alloy; S4, in each planar grid layer, each grid unit is set as a fixed point with the center of each planar grid layer as the fixed length L, and is rotated from the X axis to the Y axis to an included angle of θ; and S5, judging whether the thermal neutron transmissivity of the structure of the rare earth nickel alloy material is the same as the order of magnitude of the target transmissivity in S1. The modeling method can significantly improve the neutron shielding performance of the rare earth nickel alloy material. The rare earth nickel alloy with a microstructure can realize the consideration of shielding performance and structural function, and has the characteristics of structural-function integration.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear radiation shielding, in particular to a rare earth nickel alloy material and a modeling method and a preparation method thereof. BACKGROUND

[0002] The application environment of the traditional radiation shielding material is relatively loose, and the traditional shielding material used in the reactor or spent fuel storage container does not need to consider the size and weight restrictions, so that the preparation process of the existing radiation shielding material is mostly simple melting and mixing of the absorbing material and the matrix material or simple layering and stacking of the absorbing material and the matrix material. The raw materials are mostly layered and stacked with structural materials and functional materials (such as boron carbide), without considering miniaturization and light weight. For the development of traditional radiation shielding materials, neither simulation calculation nor process preparation needs to be accurate to the micron level of microstructure. However, the traditional radiation shielding material has the problems of low absorption effect, complex shielding material structure, large weight and volume of the shielding body, poor mechanical properties not suitable for being used as a structural material, etc., which is not conducive to the popularization and application of the radiation shielding material.

[0003] With the research and development of small reactors (especially space reactors or mobile reactors), in order to make the reactor system meet the requirements of light weight as much as possible, the shielding material with structural and functional integration has become a necessity. Rare earth elements have a high neutron absorption cross section, and can be prepared into a shielding material with structural and functional integration with alloy structural materials. Rare earth nickel alloy is a new type of neutron shielding material with nickel-based alloy as the structural material and rare earth elements with a large thermal neutron absorption cross section as the functional material. The rare earth nickel alloy not only meets the requirements of the structural material (such as physical properties, mechanical properties and corrosion resistance), but also has certain functional requirements (such as neutron absorption capacity), which realizes the structural and functional integration from the design. Using rare earth nickel alloy as a neutron shielding material can greatly simplify the shielding structure and realize the light weight of the shielding structure, and has a good application prospect in advanced reactors and spent fuel storage containers and other neutron radiation fields.

[0004] At present, the research on the neutron shielding performance of rare earth nickel alloy mainly focuses on the types and contents of rare earth elements, and the rare earth elements are uniformly distributed in the nickel-based alloy in the modeling calculation. There is less research on the modeling direction of the microscale. The preparation process of the rare earth nickel alloy is only to simply dope the rare earth into the nickel-based alloy, which forms a rare earth phase, and the shape, size and distribution of the rare earth phase are random, which is not conducive to neutron shielding. The research on rare earth nickel alloy is mostly aimed at the performance of the material, and a few involves neutron shielding research, and the requirement for neutron shielding is very low (such as about 90% shielding effect, that is, about 90% of the neutrons are shielded, and about 10% of the neutrons can pass through).

[0005] Since the solubility of rare earth elements in nickel-based alloys is very low, after the addition of rare earth elements, the rare earth-rich phase is usually doped in the basic phase of the nickel-based alloy, and the morphology, particle size, quantity and distribution of the rare earth-rich phase will have an important influence on the neutron shielding performance.

[0006] Therefore, the existing microscale fine modeling calculation method of rare earth nickel alloy needs to be further improved to realize the accurate simulation of the neutron shielding performance of the structure-function integrated rare earth nickel alloy and provide the optimal design parameters for the development of the rare earth nickel alloy. SUMMARY

[0007] In order to overcome the defects of large amount of rare earth phase and limited solid solubility, poor neutron shielding effect in the prior art, a rare earth nickel alloy material and a modeling method and a preparation method thereof are provided. The modeling method of the present application can significantly improve the neutron shielding performance of the rare earth nickel alloy material without increasing the content of rare earth elements. The rare earth nickel alloy with microstructure of the present application can realize the consideration of shielding performance and structure function, and has the characteristics of structure-function integration.

[0008] In the design of traditional neutron shielding materials, the absorption of directly incident neutrons or the neutrons scattered after passing through the shielding material is usually considered. Since the solubility of rare earth elements in nickel-based alloys is very low, the rare earth phase usually exists in the nickel-based alloy. According to the conventional design concept in the art, the rare earth phase is usually filled in the nickel-based alloy in a regular arrangement or in a random position. However, since the particle size of the rare earth phase is more than 7 orders of magnitude different from that of the neutron, and the gap between the rare earth phases is much larger than the particle size of the neutron, the thermal neutron transmittance of the above two filling methods will be between 1E-01~1E-02, which cannot effectively shield neutrons.

[0009] In order to further improve the neutron shielding performance of the rare earth nickel alloy and the degree of miniaturization and light weight (i.e. thinner shielding material is needed to achieve higher neutron shielding effect), the present application improves the structure form of the rare earth nickel alloy from the microscale (micron level, even nanometer level) without increasing the content of rare earth elements.

[0010] In order to achieve the above purpose, the present application provides the following technical solutions:

[0011] The present application provides a modeling method of a rare earth nickel alloy material, which comprises the following steps:

[0012] S1, the target rare earth nickel alloy comprises rare earth elements and nickel-based alloy, the thermal neutron target transmittance of the target rare earth nickel alloy is set, and the content of the rare earth elements is calculated by using the Monte Carlo method;

[0013] S2, dividing the nickel-based alloy into a plurality of spatial grids, and placing a rare earth phase of the rare earth element at the center of each spatial grid and within the spatial grid, and calculating the size and number of the spatial grids according to the content of the rare earth element in S1;

[0014] S3, dividing the spatial grids in S2 into a plurality of planar grid layers containing grid units along the thickness direction of the target rare earth nickel alloy, the width and length of the grid units corresponding to the width and length of the spatial grids; wherein the thickness direction of the nickel alloy is the Z-axis, the planar grid layer is the X-Y plane, and the center coordinates of each planar grid layer are [x=0, y=0]; the center point of the nickel-based alloy is the center point of the 0th planar grid layer, and the coordinates of the center point of the nickel-based alloy are [x=0, y=0, z=0];

[0015] S4, in each of the planar grid layers, each grid unit moves a distance L along the X-axis with the center of each planar grid layer as a fixed point, and based on the fixed point, rotates at an angle of θ in the X-Y plane from the X-axis towards the Y-axis with L as a fixed length, to obtain the spatial position information of the rare earth phase of the target rare earth nickel alloy in the grid unit; wherein the L is the distance of each grid unit in the Nth planar grid along the X-axis;

[0016] S5, determining whether the thermal neutron transmittance of the structure of the target rare earth nickel alloy material is of the same order of magnitude as the target transmittance in S1 according to the spatial position information of the rare earth phase in the grid unit; if not, returning to S4; if yes, outputting the final spatial position information of the rare earth phase in the grid unit.

[0017] In S1, the transmittance of the thermal neutron through the rare earth nickel alloy can be used to evaluate the neutron shielding effect; preferably, the target transmittance is less than or equal to 0.001.

[0018] In S1, the Monte Carlo method can be performed using Monte Carlo simulation software.

[0019] In S1, the rare earth element can be a conventional rare earth element in the art, and preferably one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium and scandium.

[0020] In S1, preferably, the nickel content of the nickel-based alloy is greater than or equal to 30%.

[0021] In S1, preferably, the content of the rare earth element is 0.1% to 10%, and the content of the rare earth element is the ratio of the number of atoms of the rare earth element to the sum of the number of atoms of the nickel-based alloy and the number of atoms of the rare earth element. The lower limit of the content of the rare earth element is set to ensure that the rare earth nickel alloy can meet certain neutron shielding performance, such as the thermal neutron transmittance per unit thickness. The upper limit of the content of the rare earth element is mainly to reduce the processing and manufacturing difficulty.

[0022] In S2, preferably, the spatial grid is one or more of a cuboid, a cylinder, a prism, a pyramid, a prism, and an ellipsoid; more preferably, the spatial grid is a cube to simplify the preparation process of the actual prefabricated part.

[0023] In S2, preferably, the rare earth phase is one or more of a sphere, a cube, and an irregular shape; more preferably, the rare earth phase is a sphere.

[0024] In S2, preferably, the radius of the rare earth phase is 0.1 μm to 100 μm.

[0025] In S2, preferably, the radius of each rare earth phase is the same, and the same nickel-based alloy grid can be arranged.

[0026] In S2, preferably, the rare earth phase is a single-phase of a rare earth element or a multi-phase of a rare earth element and a nickel-based alloy.

[0027] In S2, preferably, the center of the rare earth phase is aligned with the center of the spatial grid.

[0028] In S2, the volume of the spatial grid is determined by the radius of the rare earth phase and the content of the rare earth element, and preferably, the volume of the spatial grid is 1 μm 3 ~10 cm 3 .

[0029] In S3, by dividing the spatial grid in S2 into a plurality of planar grid layers containing grid units along the thickness direction of the rare earth nickel alloy, the position and arrangement of the rare earth phase in a single planar grid layer remain consistent, and a single planar grid layer corresponds to a single prefabricated part in the preparation method, which can greatly reduce the difficulty of simulation design and process preparation.

[0030] In S3, preferably, in the positive direction of the Z-axis, the distance between the Nth planar grid layer and the 0th planar grid layer is N×M, M is the width or length of the grid unit, and N is the serial number of the planar grid layer along the positive direction of the Z-axis.

[0031] In S3, preferably, in the negative direction of the Z axis, the distance between the N'th plane grid layer and the 0th plane grid layer is N'M, M is the width or length of the grid unit, and N' is the serial number of the plane grid layer of the grid unit in the negative direction of the Z axis.

[0032] In S4, preferably, in the positive direction of the Z axis, the distance of each grid unit in the Nth plane grid layer along the X axis is [2N-1]Ā μm, and Ā is the distance of a single movement. Preferably, Ā is 0.1 μm to 10 mm, and more preferably 0.1 μm, 1 μm, or 10 μm.

[0033] In S4, preferably, in the negative direction of the Z axis, the distance of each grid unit in the N'th plane grid layer along the X axis is 2N'Ā μm, and Ā is the distance of a single movement. Preferably, Ā is 0.1 μm to 10 mm, and more preferably 0.1 μm, 1 μm, or 10 μm.

[0034] In S4, the projection overlap rate of the rare earth phase is improved by moving the grid units in each plane grid layer along the axis in each X-Y plane, and then rotating from the X axis toward the Y axis in each X-Y plane, so that each grid unit moves in space, thereby achieving a better neutron shielding effect.

[0035] In S4, preferably, the range of θ is 0<θ<90° and θ≠45°, and more preferably 15°, 30°, 60°, or 75°.

[0036] In S4, in each plane grid layer, each grid unit can also be moved in the following manner: taking the center of each plane grid layer as a fixed point, moving along the Y axis by a distance L first, and then rotating from the Y axis toward the X axis in the X-Y plane based on the fixed point and with a fixed length L, and the angle of rotation from the Y axis is (90°-θ), which achieves substantially the same effect.

[0037] In S4, the center coordinates of the Nth plane grid in the positive direction of the Z axis are [(2N-1)ĀCOS(θ×3.14 / 180), (2N-1)ĀSIN(θ×3.14 / 180)].

[0038] In S4, the center coordinates of the N'th plane grid in the negative direction of the Z axis are [2NĀCOS(θ×3.14 / 180), 2NĀSIN(θ×3.14 / 180)].

[0039] In S5, preferably, the method for judging is the Monte Carlo method.

[0040] In S5, preferably, the spatial position of the rare earth phase in the grid cell includes a distance of translation along the X axis and an angle of rotation from the X axis of each grid cell in the Nth plane grid.

[0041] The present application also provides a rare earth nickel alloy material prepared by the spatial position information of the rare earth phase in the grid cell obtained by the modeling method of the rare earth nickel alloy material as described above.

[0042] The present application also provides a preparation method of a rare earth nickel alloy, which comprises the following steps:

[0043] 1) According to the spatial position information of the rare earth phase in the grid cell obtained by the modeling method of the rare earth nickel alloy material as described above, the rare earth phase is uniformly arranged in the grid cell of the nickel-based alloy to form a plurality of preforms, and the number and thickness of the preforms are the same as the number and thickness of the plane grid layers.

[0044] 2) The preforms are arranged in a layer-by-layer stacking manner according to the spatial position information of the rare earth phase in the grid cell to form a shielding body.

[0045] In step 1), preferably, the pre-set thickness of the shielding body is 5 mm, and correspondingly, the thickness of the preform is 5.44 μm, and the number of the preforms is 919.

[0046] In the present application, the preforms can be plane cut according to the shape of the required shielding body.

[0047] In the present application, in the actual preparation process of the single-layer preform, instead of the splicing of the nickel-based alloy grid, the rare earth phase is placed in the nickel-based alloy, and the rare earth phase can be arranged according to the spatial position information of the rare earth phase in the grid cell.

[0048] The present application also provides a rare earth nickel alloy prepared by the preparation method of the rare earth nickel alloy as described above.

[0049] On the basis of the common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, each preferred example of the present application is obtained.

[0050] The reagents and raw materials used in the present application are commercially available.

[0051] The positive progress effect of the present application is that:

[0052] This invention, based on a structure-function integrated geometric design concept, provides a modeling method for rare-earth nickel alloy materials. Using nickel-based alloys as the basic structure and rare-earth phases as functional units, it constructs a rare-earth nickel alloy system suitable for neutron radiation shielding. While ensuring neutron shielding effectiveness, it eliminates the need to increase the rare-earth content. Through radial movement and circumferential rotation of the rare-earth phase mesh, it achieves precise microscale modeling of the rare-earth nickel alloy, enabling rare-earth phase doping at the micrometer level. This maximizes the overlap rate of the rare-earth phases along the thickness direction (or the direction of thermal neutron incidence) of the rare-earth nickel alloy, while also considering the feasibility of fabrication processes. Based on improved neutron shielding performance, the thickness, volume, and weight of the proposed rare-earth nickel alloy are significantly reduced; furthermore, this method is not limited by the solid solubility of rare-earth elements in nickel-based alloys. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the rare earth nickel alloy material in Example 3;

[0054] Figure 1 In the figure, 'a' is a partial perspective view of the rare earth nickel alloy material in Example 3; Figure 1 In the diagram, b is the XY plan view of the rare earth nickel alloy material in Example 3; Figure 1 c in the figure represents the YZ planar view of the rare earth nickel alloy material in Example 3. Figure 1 In the figure, d represents the XZ planar view of the rare earth nickel alloy material in Example 3.

[0055] Figure 2 This is a schematic diagram of the rare earth nickel alloy material in Example 6;

[0056] Figure 2 In Figure 'a', a partial perspective view of the rare earth nickel alloy material of Example 6 is shown. Figure 2 In the diagram, b is the XY plan view of the rare earth nickel alloy material in Example 6; Figure 2 c in the figure represents the YZ planar view of the rare earth nickel alloy material in Example 6. Figure 2 In the figure, d represents the XZ planar view of the rare earth nickel alloy material in Example 6.

[0057] Figure 3 This is a schematic diagram of the rare earth nickel alloy material in Example 9;

[0058] Figure 3 In the image 'a', it is a partial perspective view of the rare earth nickel alloy material in Example 9. Figure 3 In the diagram, b is the XY plan view of the rare earth nickel alloy material in Example 9; Figure 3 c in the figure represents the YZ planar view of the rare earth nickel alloy material in Example 9; Figure 3 In the figure, d represents the XZ planar view of the rare earth nickel alloy material in Example 9.

[0059] Figure 4 is a schematic view of the rare earth nickel alloy material of Example 12;

[0060] Figure 4 is a partial perspective view of the rare earth nickel alloy material of Example 12 in a; Figure 4 is an X-Y plan view of the rare earth nickel alloy material of Example 12 in a; Figure 4 is a Y-Z plan view of the rare earth nickel alloy material of Example 12 in a; Figure 4 is an X-Z plan view of the rare earth nickel alloy material of Example 12 in a.

[0061] Figure 5 is a schematic view of the rare earth nickel alloy material of Comparative Example 1;

[0062] Figure 5 is a partial perspective view of the rare earth nickel alloy material of Comparative Example 1 in a; Figure 5 is an X-Y plan view of the rare earth nickel alloy material of Comparative Example 1 in a; Figure 5 is a Y-Z plan view of the rare earth nickel alloy material of Comparative Example 1 in a; Figure 5 is an X-Z plan view of the rare earth nickel alloy material of Comparative Example 1 in a.

[0063] Figure 6 is a schematic view of the rare earth nickel alloy material of Comparative Example 3;

[0064] Figure 6 is a partial perspective view of the rare earth nickel alloy material of Comparative Example 3 in a; Figure 6 is an X-Y plan view of the rare earth nickel alloy material of Comparative Example 3 in a; Figure 6 is a Y-Z plan view of the rare earth nickel alloy material of Comparative Example 3 in a; Figure 6 is an X-Z plan view of the rare earth nickel alloy material of Comparative Example 3 in a.

[0065] Figure 7 is a schematic view of the rare earth nickel alloy material of Comparative Example 6;

[0066] Figure 7 is a partial perspective view of the rare earth nickel alloy material of Comparative Example 6 in a; Figure 7 is an X-Y plan view of the rare earth nickel alloy material of Comparative Example 6 in a; Figure 7 is a Y-Z plan view of the rare earth nickel alloy material of Comparative Example 6 in a; Figure 7 is an X-Z plan view of the rare earth nickel alloy material of Comparative Example 6 in a. DETAILED DESCRIPTION

[0067] The application will be further described in the following by way of examples without limiting the application to the examples described. The experimental methods in the following examples, for which no specific conditions are indicated, are carried out in accordance with the usual methods and conditions or as selected in the manufacturer's instructions.

[0068] Example 1

[0069] A modeling method of a rare earth nickel alloy material, comprising the following steps:

[0070] S1, the target rare earth nickel alloy comprises a rare earth element and a nickel-based alloy, the rare earth element is a gadolinium-rich phase, the gadolinium-rich phase is Ni5Gd; the nickel-based alloy adopts GH3535, and the density of the nickel-based alloy is 8.9 g / cm 3 The nickel content of the nickel-based alloy is 70%. The thermal neutron target transmittance of the target rare earth nickel alloy is set to 3.03E-04, the content of the rare earth element is calculated to be 0.35% by using a Monte Carlo simulation software, and the content of the rare earth element is the ratio of the number of atoms of the rare earth element to the sum of the number of atoms of the nickel-based alloy and the number of atoms of the rare earth element.

[0071] S2, a cuboid nickel-based alloy with a size of 5 cm*5 cm*5 mm is divided into a plurality of spatial grids with a square of 5.44 μm, a rare earth phase of the rare earth element is arranged at the center of each spatial grid and completely located within the spatial grid, the rare earth phase is a sphere with a radius of 1.00 μm, the radius of each rare earth phase is the same, and the center of the rare earth phase is aligned with the center of the spatial grid; the size and the number of the spatial grids are calculated according to the content of the rare earth element in S1;

[0072] S3, the spatial grids in S2 are divided into 919 plane grid layers containing grid units in the thickness direction of the rare earth nickel alloy in units of spatial grid length, the width and the length of the grid units correspond to the width and the length of the spatial grids; the thickness of the rare earth nickel alloy plate is 5 mm. In the same grid layer, the rare earth phases are filled according to the grid rules of the nickel-based alloy. Wherein, the thickness direction of the nickel-based alloy is the Z axis, the plane grid layer is the X-Y plane, the center coordinates of each plane grid layer are (x=0, y=0), the center point of the nickel-based alloy is the center point of the 0th plane grid layer, and the center coordinates of the center point of the nickel-based alloy are (x=0, y=0, z=0); along the positive direction of the Z axis, the distance between the Nth plane grid layer and the 0th plane grid layer is N*5.44 μm; along the negative direction of the Z axis, the distance between the N'th plane grid layer and the 0th plane grid layer is N*5.44 μm.

[0073] S4, in one of the planar grid layers, each of the grid units is first moved along the X-axis by a distance L, with L as the fixed length, and then rotated in the X-Y plane to an angle of θ from the X-axis towards the Y-axis, L being the distance of each grid unit in the Nth planar grid layer along the X-axis. In the positive direction of the Z-axis, L=(2N-1) x A pm), where N=1, 2, 3, 4, …, 459. In the negative direction of the Z-axis, L=2N' x A pm, where N=1, 2, 3, 4, …, 459. Where A is the distance of a single movement; here θ is 15°, and A is 1 pm.

[0074] Where the upper, middle and lower correspond to the first layer in the positive direction of the Z-axis, the centermost layer in the Z-axis and the first layer in the negative direction of the Z-axis, respectively, and the x and y coordinates of the center of each planar grid layer are shown in Table 1.

[0075] Table 1

[0076] Grid center coordinates x (μm) y (μm) z-axis positive direction Nth layer (2N-1) x Ā x COS (15 x 3.14 / 180) (2N-1) x Ā x SIN (15 x 3.14 / 180) z-axis positive direction 2nd layer 2.90 0.78 z-axis positive direction 1st layer 0.97 0.26 z-axis most central layer 0.00 0.00 z-axis negative direction 1st layer 1.93 0.52 z-axis negative direction 2nd layer 3.86 1.04 z-axis negative direction Nth layer 2N x Ā x COS (15 x 3.14 / 180) 2N x Ā x SIN (15 x 3.14 / 180)

[0077] S5, the thermal neutron source is vertically incident from the negative direction of the Z-axis through the rare earth nickel alloy plate. According to the center coordinate information of the space grid, the thermal neutron transmittance of the structure of the rare earth nickel alloy material is calculated by using the Monte Carlo method whether it is of the same order of magnitude as the target transmittance in S1, if not, return to S4; if yes, output the spatial position of the rare earth phase in the grid unit.

[0078] Comparative Example 1

[0079] The shape and size of the gadolinium-rich phase of the present comparative example are the same as those of Example 1, and the shape and size of the nickel-based alloy grid also remain consistent with those of Example 1. Figure 5 is a schematic diagram of the rare earth nickel alloy material of the present comparative example; Figure 5 is a partial perspective view of the rare earth nickel alloy material of the present comparative example; Figure 5 is an X-Y plane view of the rare earth nickel alloy material of the present comparative example; Figure 5 is a Y-Z plane view of the rare earth nickel alloy material of the present comparative example; Figure 5 is an X-Z plane view of the rare earth nickel alloy material of the present comparative example. Where the red balls in the center grid layer are unadjusted, the upper grid layer (green balls) and the lower grid layer (blue balls) are adjusted, and the white part outside the balls in the black square is the nickel-based alloy. The upper, middle and lower correspond to the first layer in the positive direction of the Z-axis, the centermost layer in the Z-axis and the first layer in the negative direction of the Z-axis, respectively.

[0080] The grid center coordinates of all grid layers in the thickness direction of the rare earth nickel alloy are filled according to the same coordinate. Through Monte Carlo simulation software calculation, the thermal neutron transmittance of the rare earth nickel alloy is 4.37E-01, which is about 3 orders of magnitude higher than the target thermal neutron transmittance.

[0081] In the prior art rare earth nickel alloy without adjusting the microstructure, the shape, size and position of the rare earth phase are randomly distributed, and the microstructure of the comparative example is regularly distributed (which can be classified as adjusting the position distribution of the microstructure), but the neutron shielding effect of the comparative example and the rare earth nickel alloy without adjusting the microstructure is close, and the neutron shielding performance of both is low.

[0082] Examples 2-13 and Comparative Examples 2-7

[0083] The thermal neutron target transmittance of the rare earth nickel alloy is set to 3.03E-04, and the modeling method of the rare earth nickel alloy material of Example 1 is used, and the following conditions are used: single moving distance Ā is 0.1 μm, 1 μm and 10 mm, and rotation angle θ is 0°, 15°, 30°, 45°, 60° and 75°.

[0084] Example 3 is a rare earth nickel alloy material with single moving Ā = 1 μm and angle θ = 15° with the X axis, Figure 1 is a schematic diagram of the rare earth nickel alloy material of this example; Figure 1 a in is a partial perspective view of the rare earth nickel alloy material of this example; Figure 1 b in is an X-Y plane view of the rare earth nickel alloy material of this example; Figure 1 c in is a Y-Z plane view of the rare earth nickel alloy material of this example; Figure 1 d in is an X-Z plane view of the rare earth nickel alloy material of this example. In the figure, the red balls in the central grid layer are not adjusted, the upper grid layer (green balls) and the lower grid layer (blue balls) are adjusted, and the white part outside the balls in the black square is the nickel-based alloy. The upper, middle and lower correspond to the first layer in the positive direction of the Z axis, the central layer of the Z axis and the first layer in the negative direction of the Z axis, respectively.

[0085] Example 6 is a rare earth nickel alloy material with single moving Ā = 1 μm and angle θ = 30° with the X axis, Figure 2 is a schematic diagram of the rare earth nickel alloy material of this example; Figure 2 a in is a partial perspective view of the rare earth nickel alloy material of this example; Figure 2 b in is an X-Y plane view of the rare earth nickel alloy material of this example; Figure 2 c in is a Y-Z plane view of the rare earth nickel alloy material of this example; Figure 2 d in is an X-Z plane view of the rare earth nickel alloy material of this example.

[0086] Example 9 is a rare earth nickel alloy material with single moving Ā = 1 μm and angle θ = 60° with the X axis, Figure 3 is a schematic diagram of the rare earth nickel alloy material of this example; Figure 3Figure 2a is a partial perspective view of the rare earth nickel alloy material of this example; Figure 3 Figure 2b is an X-Y plan view of the rare earth nickel alloy material of this example; Figure 3 Figure 2c is a Y-Z plan view of the rare earth nickel alloy material of this example; Figure 3 Figure 2d is an X-Z plan view of the rare earth nickel alloy material of this example.

[0087] Example 12 is a rare earth nickel alloy material with a single movement Ā = 1 μm, and an angle θ = 75° with the X axis, Figure 4 Figure 12a is a schematic view of the rare earth nickel alloy material of this example; Figure 4 Figure 12a is a partial perspective view of the rare earth nickel alloy material of this example; Figure 4 Figure 12b is an X-Y plan view of the rare earth nickel alloy material of this example; Figure 4 Figure 12c is a Y-Z plan view of the rare earth nickel alloy material of this example; Figure 4 Figure 12d is an X-Z plan view of the rare earth nickel alloy material of this example.

[0088] Comparative Example 3 is a rare earth nickel alloy material with a single movement Ā = 1 μm, and an angle θ = 0° with the X axis, not rotated, Figure 6 Figure 13a is a schematic view of the rare earth nickel alloy material of this example; Figure 6 Figure 13a is a partial perspective view of the rare earth nickel alloy material of this example; Figure 6 Figure 13b is an X-Y plan view of the rare earth nickel alloy material of this example; Figure 6 Figure 13c is a Y-Z plan view of the rare earth nickel alloy material of this example; Figure 6 Figure 13d is an X-Z plan view of the rare earth nickel alloy material of this example.

[0089] Comparative Example 6 is a rare earth nickel alloy material with a single movement Ā = 1 μm, and an angle θ = 45° with the X axis, Figure 7 Figure 16a is a schematic view of the rare earth nickel alloy material of this example; Figure 7 Figure 16a is a partial perspective view of the rare earth nickel alloy material of this example; Figure 7 Figure 16b is an X-Y plan view of the rare earth nickel alloy material of this example; Figure 7 Figure 16c is a Y-Z plan view of the rare earth nickel alloy material of this example; Figure 7 Figure 16d is an X-Z plan view of the rare earth nickel alloy material of this example.

[0090] Thermal neutron transmission of the rare earth nickel alloy with different single movement distances Ā and different angles θ of rotation with the X axis, as shown in Table 2.

[0091] Table 2

[0092] Examples and Comparative Examples Rotational angle Single movement Ā = 0.1 μm Single movement Ā = 1 μm Single movement Ā = 10 mm Comparative Examples 2 to 4 Rotational angle θ = 0° 2.95E-01 2.95E-01 2.72E-01 Examples 2 to 4 Rotational angle θ = 15° 3.45E-04 3.21E-04 3.05E-04 Examples 5 to 7 Rotational angle θ = 30° 3.50E-04 3.33E-04 5.47E-04 Comparative Examples 5 to 7 Rotational angle θ = 45° 1.20E-01 1.20E-01 1.01E-01 Examples 8 to 10 Rotational angle θ = 60° 3.50E-04 3.33E-04 5.40E-04 Examples 11 to 13 Rotational angle θ = 75° 3.45E-04 3.21E-04 2.70E-04

[0093] In Table 2, Examples 2-13 are structures of the rare earth nickel alloy material corresponding to the radial movement distance Ā of 0.1 μm, 1 μm, and 10 mm respectively under the condition that the rotation angle θ is 15°, 30°, 60°, and 75° respectively; Comparative Examples 2-7 are structures of the rare earth nickel alloy material corresponding to the radial movement distance Ā of 0.1 μm, 1 μm, and 10 mm respectively under the condition that the rotation angle θ is 0° and 45° respectively. It can be seen that the thermal neutron transmittance of the rare earth nickel alloy material of Examples 2-13 is of the same order of magnitude as the target thermal neutron transmittance (3.03E-04), and the rare earth nickel alloy material of these examples can achieve an ideal neutron shielding effect; while the thermal neutron transmittance of the rare earth nickel alloy material of Comparative Examples 2-7 differs from the target thermal neutron transmittance by at least 3 orders of magnitude, and the neutron shielding effect of the rare earth nickel alloy material is poor.

[0094] Example 14

[0095] Using the same raw materials and method as described in Example 1, the content of the gadolinium-rich phase is increased to 0.55 at% or more, and after structure adjustment as in Example 1, the thermal neutron transmittance of the rare earth nickel alloy material can be lower than 1E-05. To achieve the same neutron shielding effect, the thickness of the rare earth nickel alloy proposed in the present application will be greatly reduced, and the volume and weight will also be greatly reduced.

[0096] Example 15

[0097] A modeling method of a rare earth nickel alloy material, comprising the following steps:

[0098] S1, the rare earth nickel alloy comprises a rare earth element and a nickel-based alloy, the rare earth element is a gadolinium-rich phase, the gadolinium-rich phase is a spherical natural gadolinium with a density of 7.9 g / cm 3 , and a radius of 1.00 μm, which is regarded as a gadolinium cluster for simplifying calculation; the nickel-based alloy is GH3535 with a density of 8.9 g / cm 3 , and the nickel content of the nickel-based alloy is 70%. The target thermal neutron transmittance of the rare earth nickel alloy is set to 3.03E-04, and the content of the rare earth element is calculated by using Monte Carlo simulation software, wherein the content of the rare earth element is the ratio of the number of atoms of the rare earth element to the sum of the number of atoms of the nickel-based alloy and the number of atoms of the rare earth element.

[0099] S2, a cuboid nickel-based alloy with a size of 5 cm×5 cm×5 mm is divided into a plurality of spatial grids with a side length of 7.48 μm, and the rare earth phase of the rare earth element is placed at the center of the spatial grid and completely located within the spatial grid, the rare earth phase is a sphere with a radius of 1.00 μm, the radii of the rare earth phases are the same, and the center of the rare earth phase is aligned with the center of the spatial grid; according to the content of the rare earth element in S1, the size and number of the spatial grids are calculated;

[0100] S3, divide the space grid in S2 into 669 plane grid layers containing grid cells along the thickness direction of the rare earth nickel alloy in units of space grid side length, the width and length of the grid cells correspond to the width and length of the space grid; the thickness of the rare earth nickel alloy plate is 5 mm. In the same grid layer, the rare earth phase is filled according to the nickel-based alloy grid rule. Among them, the thickness direction of the nickel alloy is the Z axis, the plane grid layer is the X-Y plane, the center coordinates of each plane grid layer are (x=0, y=0), the center point of the nickel-based alloy is the center point of the 0th plane grid layer, and the center point of the nickel-based alloy is (x=0, y=0, z=0); along the positive direction of the Z axis, the distance between the Nth plane grid layer and the 0th plane grid layer is N*7.48 μm; along the negative direction of the Z axis, the distance between the N'th plane grid layer and the 0th plane grid layer is N*7.48 μm.

[0101] S4, in one of the plane grid layers, each of the grid cells is first moved by a distance L along the X axis with the center of each of the plane grid layers as a fixed point, and based on the fixed point, rotates to an included angle of θ in the X-Y plane from the X axis towards the Y axis with L as a fixed length, L is the distance of each grid cell in the Nth plane grid layer along the X axis. In the positive direction of the Z axis, L=(2N-1)*Āμm, where N=1, 2, 3, 4, …, 334. In the negative direction of the Z axis, L=2N'*Āμm, where N=1, 2, 3, 4, …, 334. Where Ā is the distance of a single movement, which is 1 μm here.

[0102] Where the upper, middle and lower correspond to the first layer in the positive direction of the Z axis, the centermost layer in the Z axis and the first layer in the negative direction of the Z axis respectively, and the x and y of the center coordinates of each plane grid layer are shown in Table 3.

[0103] Table 3

[0104] Grid center coordinates x (μm) y (μm) z-axis positive direction Nth layer (2N-1) x 1 x COS (15 x 3.14 / 180) (2N-1) x 1 x SIN (15 x 3.14 / 180) z-axis positive direction 2nd layer 2.8978 0.7765 z-axis positive direction 1st layer 0.9659 0.2588 z-axis most central layer 0.0000 0.0000 z-axis negative direction 1st layer 1.9319 0.5176 z-axis negative direction 2nd layer 3.8637 1.0353 z-axis negative direction Nth layer 2N x 1 x COS (15 x 3.14 / 180) 2N x 1 x SIN (15 x 3.14 / 180)

[0105] S5, the thermal neutron source is vertically incident from the negative direction of the z axis through the rare earth nickel alloy plate. According to the center coordinate information of the space grid, the Monte Carlo method is used to calculate whether the thermal neutron transmittance of the structure of the rare earth nickel alloy material is the same order of magnitude as the target transmittance in S1, if not, return to S4; if yes, output the spatial position of the rare earth phase in the grid cell.

[0106] Based on the fine modeling of the rare earth phase and the nickel-based alloy basic phase, the thermal neutron transmittance of the rare earth nickel alloy material is calculated by the Monte Carlo software to be 3.59E-04, which is the same order of magnitude as the set thermal neutron target transmittance of the rare earth nickel alloy.

[0107] Example 16

[0108] Different from example 15: the single radial movement distance of the center coordinates of the nickel-based alloy grid Ā=1 μm, while rotating 30 degrees counterclockwise, the angle θ=30° with the X axis. The thermal neutron transmittance of the rare earth nickel alloy is 3.33E-04.

[0109] Example 17

[0110] Different from example 15: the single radial movement distance of the center coordinates of the nickel-based alloy grid Ā=1 μm, while rotating 60 degrees counterclockwise, the angle θ=60° with the X axis. The thermal neutron transmittance of the rare earth nickel alloy is 3.33E-04.

[0111] Example 18

[0112] Different from example 15: the single radial movement distance of the center coordinates of the nickel-based alloy grid Ā=1 μm, while rotating 75 degrees counterclockwise, the angle θ=75° with the X axis. The thermal neutron transmittance of the rare earth nickel alloy is 3.21E-04.

[0113] Example 19

[0114] A method for preparing a rare earth nickel alloy, comprising the following steps:

[0115] 1) The spatial position of the rare earth phase in the grid unit obtained according to the modeling method of the rare earth nickel alloy material in examples 1-18, the rare earth phase is uniformly arranged in the grid unit of the nickel-based alloy, and 919 preforms with a thickness of 5.44 μm are prepared, the number and thickness of the preforms are the same as the number and thickness of the planar grid layers;

[0116] 2) The preforms are arranged in a layer-by-layer stacking manner to form a shielding body, and the thickness of the shielding body is 5 mm.

Claims

1. A method of modeling a rare earth nickel alloy material, characterized by, It comprises the following steps: S1, the target rare earth nickel alloy comprises rare earth elements and nickel-based alloy, the thermal neutron target transmittance of the target rare earth nickel alloy is set, and the content of the rare earth elements is calculated by using a Monte Carlo method; S2, the nickel-based alloy is divided into a plurality of spatial grids, the rare earth phase of the rare earth elements is placed in the center of the spatial grid and is completely located within the spatial grid, and the size and the number of the spatial grid are calculated according to the content of the rare earth elements in S1; S3, the spatial grid in S2 is divided into a plurality of plane grid layers containing grid units along the thickness direction of the target rare earth nickel alloy, the width and the length of the grid unit correspond to the width and the length of the spatial grid; wherein the thickness direction of the nickel alloy is the Z axis, the plane grid layer is the X-Y plane, and the center coordinates of each plane grid layer are [x=0, y=0]; the center point of the nickel-based alloy is the center point of the 0th plane grid layer, and the coordinates of the center point of the nickel-based alloy are [x=0, y=0, z=0]; S4, in each plane grid layer, each grid unit moves L distance along the X axis with the center of each plane grid layer as a fixed point, and rotates to an angle of θ in the X-Y plane from the X axis to the Y axis with L as a fixed length based on the fixed point, to obtain the spatial position information of the rare earth phase of the target rare earth nickel alloy in the grid unit; S5, whether the thermal neutron transmittance of the structure of the target rare earth nickel alloy material is of the same order of magnitude as the target transmittance in S1 is judged according to the spatial position information of the rare earth phase in the grid unit; if not, return to S4; if yes, output the final spatial position information of the rare earth phase in the grid unit.

2. The method of modeling a rare earth nickel alloy material of claim 1, wherein, In S1, the target transmittance is less than or equal to 0.001; And / or, the Monte Carlo method is performed by using a Monte Carlo simulation software; And / or, the rare earth elements are one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium and scandium; And / or, the nickel content of the nickel-based alloy is greater than or equal to 30%; And / or, the content of the rare earth elements is 0.1%-10%, and the content of the rare earth elements is the ratio of the number of atoms of the rare earth elements to the sum of the number of atoms of the nickel-based alloy and the number of atoms of the rare earth elements.

3. The method of modeling a rare earth nickel alloy material of claim 1, wherein, In S2, the spatial grid is one or more of a cuboid, a cylinder, a prism, a pyramid, a prism and an ellipsoid; And / or, the rare earth phase is one or more of a sphere, a cube and an irregular shape; And / or, the radius of the rare earth phase is 0.1-100 μm; And / or, the radius of each rare earth phase is the same; And / or, the rare earth phase is a single-phase of rare earth elements or a multi-phase of rare earth elements and nickel-based alloy; And / or, the center of the rare earth phase is aligned with the center of the spatial grid. and / or the volume of the spatial grid is 1 pm 3 ~10 cm 3 .

4. The method of modeling a rare earth nickel alloy material of claim 1, wherein, In S2, the spatial grid is a cube.

5. The method of modeling a rare earth nickel alloy material of claim 3, wherein, The rare earth phase is a sphere.

6. The method of modeling a rare earth nickel alloy material of claim 1, wherein, In S3, in the positive direction of the Z axis, the distance between the Nth plane grid layer and the 0th plane grid layer is N×M, M is the width or length of the grid unit, and N is the serial number of the plane grid layer in the positive direction of the Z axis of the grid unit; and / or, in the negative direction of the Z axis, the distance between the N'th plane grid layer and the 0th plane grid layer is N'×M, M is the width or length of the grid unit, and N' is the serial number of the plane grid layer in the negative direction of the Z axis of the grid unit.

7. The method of modeling a rare earth nickel alloy material of claim 6, wherein, In S4, in the positive direction of the Z axis, the L is the distance of each grid unit in the Nth plane grid layer along the X axis, L = [2N-1]×Ā μm, and Ā is the distance of single movement; the Ā is 0.1 μm to 10 mm; and / or, in the negative direction of the Z axis, the L is the distance of each grid unit in the N'th plane grid layer along the X axis, 2N'×Ā μm, and Ā is the distance of single movement; the Ā is 0.1 μm to 10 mm; and / or, the θ is in the range of 0<θ<90° and θ≠45°.

8. The method of modeling a rare earth nickel alloy material of claim 7, wherein, In S4, in the positive direction of the Z axis, the Ā is 0.1 μm, 1 μm or 10 μm; and / or, in the negative direction of the Z axis, the Ā is 0.1 μm, 1 μm or 10 μm; and / or, the θ is 15°, 30°, 60° or 75°.

9. The method of modeling a rare earth nickel alloy material of claim 1, wherein, In S5, the judging method is the Monte Carlo method; and / or, the spatial position of the rare earth phase in the grid unit includes the distance of the movement of the plane grid layer along the Z axis, the distance of the translation of the grid unit in the plane grid layer along the axis in the X-Y plane, and the angle of the circumferential rotation of the center point of the plane grid layer in the X-Y plane.

10. A rare earth nickel alloy material, characterized by, Prepared from the spatial position information of the rare earth phase in the grid unit obtained according to the modeling method of the rare earth nickel alloy material according to any one of claims 1-9.

11. A method of producing a rare earth nickel alloy, characterized by, It comprises the following steps: 1) according to the spatial position information of the rare earth phase in the grid unit obtained according to the modeling method of the rare earth nickel alloy material according to any one of claims 1-9, the rare earth phase is uniformly arranged in the grid unit of the nickel-based alloy to make several preforms, and the number and thickness of the preforms are the same as the number and thickness of the plane grid layers; 2) arranging the preforms in a layer-by-layer stacking manner and according to the spatial position information of the rare earth phase in the grid unit to form a shielding body.

12. The method of producing a rare earth nickel alloy according to claim 11, wherein In step 1), the thickness of the preform is 5.44 μm; the number of the preform is 919; in step 2), the pre-set thickness of the shielding body is 5 mm.

13. A rare earth nickel alloy, characterized by, Prepared by the preparation method of the rare earth nickel alloy according to claim 11 or 12.

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