Alloy material and preparation method and application thereof

Abstract

The invention provides an alloy material and a preparation method and application thereof. The chemical formula of the alloy material is TiaCrbVcMnd, a = 1, b is larger than or equal to 0.75 and smaller than or equal to 1.74, c is larger than or equal to 0.01 and smaller than or equal to 0.25, d is larger than or equal to 0.25 and smaller than or equal to 1, and b + c + d = 2. The alloy material disclosed by the invention not only has relatively high hydrogen storage capacity and a relatively low hydrogen desorption platform under a room temperature condition, but also has relatively high dynamic performance, and shows relatively high safety and cycling stability, so that the alloy material is a potential solid hydrogen storage material suitable for vehicle-mounted vehicles.

Description

Technical Field

[0001] The present application relates to the field of alloy materials, specifically, the present application relates to an alloy material and a preparation method and application thereof, and more specifically, to a hydrogen storage alloy material. Background Art

[0002] The safe and efficient storage of hydrogen is an important part of the development and utilization of hydrogen energy. There are three ways to store hydrogen: gaseous hydrogen storage, liquid hydrogen storage, and solid hydrogen storage. Among them, the hydrogen storage density of gaseous hydrogen storage is low, and hydrogen needs to be stored at high pressure, which is not very safe; liquid hydrogen storage is energy-intensive, costly, and requires high insulation properties of storage tanks; and solid hydrogen storage materials are an emerging method of storing hydrogen through physical or chemical reactions. Hydrogen storage alloys are a type of hydrogen storage material that is currently developing rapidly and being widely researched because of their advantages such as high hydrogen storage density, simple operation, safety and reliability. The hydrogen storage alloys that have been researched and developed include AB5 rare earth alloys, AB2 Laves phase alloys, AB Ti alloys, V-based solid solution alloys, and A2B Mg-Ni alloys.

[0003] In recent years, vanadium-based solid solutions have attracted widespread attention due to their high hydrogen storage density and low hydrogen release platform. However, due to the high vanadium content in vanadium-based solid solution materials, on the one hand, the raw material cost is extremely high, and on the other hand, the phase change that occurs during the absorption and desorption of hydrogen may affect the structural stability of the material, thereby shortening the cycle life. Studies have shown that adding an appropriate amount of vanadium to the low-cost and stable AB2 alloy can not only enhance the structural stability of the material, but also effectively increase the hydrogen storage capacity.

[0004] Therefore, developing a low-vanadium alloy material with a long service life is of great significance for the application of solid-state hydrogen storage technology. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] In the first aspect of the present application, the present application proposes an alloy material. According to an embodiment of the present application, the chemical formula of the alloy material is: Ti a Cr b V c Mn d, wherein a=1, 0.75≤b≤1.74, 0.01≤c≤0.25, 0.25≤d≤1, and 1.8≤b+c+d≤2. The alloy material of the present application not only has a high hydrogen storage capacity and a low hydrogen release platform at room temperature, but also has a faster kinetic performance, and can exhibit high safety and cycle stability. Even at sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle-mounted fuel cell stacks. In addition, the pressure-composition-temperature (PCT) curve of the alloy material has a certain slope, which is conducive to real-time monitoring of the hydrogen content in the alloy. In addition, the alloy material of the present application can reduce the amount of vanadium while maintaining excellent hydrogen storage performance, effectively reducing material costs and reducing the demand for expensive raw materials.

[0007] According to an embodiment of the present application, the alloy material is an AB2 type Laves phase alloy.

[0008] In the second aspect of the present application, the present application proposes a method for preparing the alloy material described in the first aspect. According to an embodiment of the present application, the method comprises: smelting Ti raw material, Cr raw material, V raw material and Mn raw material to obtain a molten body; and ingotizing the molten body to obtain the alloy material. The method of the present application has simple steps and is easy to operate. It can prepare a Laves phase AB2 hydrogen storage alloy material with a single and stable physical structure. The alloy material has high hydrogen storage capacity, low hydrogen release platform and faster kinetic performance at room temperature. At sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle-mounted fuel cell stacks. In addition, the method reduces the amount of vanadium used and reduces the cost of raw materials while ensuring excellent hydrogen storage performance.

[0009] According to an embodiment of the present application, the purity of Ti in the Ti raw material is greater than 99.5%, the purity of Cr in the Cr raw material is greater than 99.5%, the purity of V in the V raw material is greater than 99.5%, and the purity of Mn in the Mn raw material is greater than 99.5%.

[0010] According to an embodiment of the present application, the smelting process and the ingot turning process are performed in the same container.

[0011] According to an embodiment of the present application, an inert gas is used as a protective atmosphere in the container.

[0012] According to an embodiment of the present application, the ingot turning process is performed 3-8 times.

[0013] According to an embodiment of the present application, the inert gas includes at least one of helium, neon, argon or nitrogen.

[0014] According to an embodiment of the present application, the pressure in the container is -0.05MPa to -0.03MPa.

[0015] According to an embodiment of the present application, the temperature in the container is 1500°C-2000°C.

[0016] In the third aspect of the present application, the present application proposes a solid-state hydrogen storage device. According to an embodiment of the present application, the solid-state hydrogen storage device includes the alloy material described in the first aspect or the alloy material prepared by the method described in the second aspect as a hydrogen storage medium. As mentioned above, the alloy material of the present application has a high hydrogen storage capacity, a low hydrogen release platform, and faster kinetic performance at room temperature, and can exhibit higher safety and cycle stability. As a result, the solid-state hydrogen storage device of the present application can store more hydrogen and has a lower hydrogen release pressure platform. Those skilled in the art can understand that the solid-state hydrogen storage device has all the characteristics and advantages of the alloy material described above, and will not be elaborated on here.

[0017] In the fourth aspect of the present application, the present application proposes a vehicle-mounted hydrogen storage system. According to an embodiment of the present application, the solid-state hydrogen storage device includes the alloy material described in the first aspect or the alloy material prepared by the method described in the second aspect as a hydrogen storage medium. As mentioned above, the alloy material of the present application has a high hydrogen storage capacity, a low hydrogen release platform, and faster kinetic performance, and can exhibit higher safety and cycle stability. At sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle-mounted fuel cell stacks. Therefore, the alloy material of the present application can be used in a vehicle-mounted hydrogen storage system. Those skilled in the art will understand that the vehicle-mounted hydrogen storage system has all the characteristics and advantages of the alloy material described above, and will not be elaborated on here.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 A schematic diagram of the process for preparing a hydrogen storage alloy material according to an embodiment of the present application is shown;

[0021] Figure 2 The XRD diagram of the alloy material of Example 1 of the present application is shown;

[0022] Figure 3 The XRD diagram of the alloy material of Example 2 of the present application is shown;

[0023] Figure 4 The XRD diagram of the alloy material of Example 3 of the present application is shown;

[0024] Figure 5 The hydrogen storage performance diagram of the alloy materials of Examples 1-3 and Comparative Example 1 of the present application is shown. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below. The embodiments described below are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] For simplicity, only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and any upper limit can be combined with any other upper limit to form an unspecified range. In addition, each separately disclosed point or single value can itself be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits to form an unspecified range.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0030] In the present application, the terms "comprise" or "include" are open expressions, that is, including the contents specified in the present application but not excluding other contents.

[0031] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0032] Hydrogen storage is a key link in the hydrogen energy system. Solid-state hydrogen storage materials store hydrogen in solid materials through chemical reactions or physical adsorption. They have high energy density and good safety, and are considered to be the most promising hydrogen storage method. The principle of metal solid-state hydrogen storage is that hydrogen enters the hydrogen storage alloy under certain conditions, and hydrogen is first catalytically decomposed into hydrogen atoms on its surface. The hydrogen atoms then diffuse into the gaps inside the material lattice and are stored in the metal gaps in an atomic state to form metal hydrides. The reaction process is reversible, thereby realizing the storage and release of hydrogen.

[0033] Compared with rare earth LaNi5, TiFe, TiMn2 and other widely used hydrogen storage alloys, vanadium-based hydrogen storage alloys have the advantage of high hydrogen storage capacity and become one of the most promising hydrogen storage alloys. However, the cost of metal vanadium is relatively high, so the production cost of the alloy is too high.

[0034] Based on this, the present application introduces an appropriate amount of vanadium elements on the basis of the Ti-Cr-Mn system to form a Ti-Cr-V-Mn quaternary alloy. After a large number of experiments, the applicant systematically adjusted the atomic ratios of these four elements and finally determined the optimal ratio. Among them, the addition of appropriate vanadium elements can reduce the platform pressure of the Ti-Cr-Mn alloy and increase the hydrogen storage density. In addition, the prepared Ti-Cr-V-Mn quaternary alloy exhibits a single and stable low-vanadium Laves phase AB2 alloy structure without the appearance of other phases. This feature ensures the long-term service life of the alloy, with a lower hydrogen release platform and higher hydrogen storage capacity at room temperature, and the pressure platform at sub-zero temperatures can still be suitable for on-board hydrogen storage systems.

[0035] Alloy Material

[0036] In the first aspect of the present application, the present application proposes an alloy material. According to an embodiment of the present application, the chemical formula of the alloy material is: Ti a Cr b V c Mn d, wherein a=1, 0.75≤b≤1.74, 0.01≤c≤0.25, 0.25≤d≤1, and 1.8≤b+c+d≤2. After a large number of experiments, the applicant regulated the atomic ratios of the four elements to obtain the above-mentioned optimal range. The alloy material not only has a high hydrogen storage capacity and a low hydrogen release platform at room temperature, but also has faster kinetic performance, and can exhibit high safety and cycle stability. Even at sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle-mounted fuel cell stacks. In addition, the pressure-composition-temperature (PCT) curve of the alloy material has a certain slope, which is conducive to real-time monitoring of the hydrogen content in the alloy. In addition, the alloy material of the present application can reduce the amount of vanadium while maintaining excellent hydrogen storage performance, effectively reducing material costs and reducing the demand for expensive raw materials.

[0037] Illustratively, b may be 0.75, 0.9, 1, 1.2, 1.5, 1.74, etc., or may be a range consisting of any of the above values.

[0038] Illustratively, c may be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, etc., or may be a range consisting of any of the above values.

[0039] Illustratively, d may be 0.25, 0.4, 0.65, 0.8, 1, etc., or may be a range consisting of any of the above values.

[0040] In some embodiments of the present application, the alloy material is an AB2 type Laves phase alloy.

[0041] In some embodiments of the present application, the alloy material is C 14 Type Laves phase alloy.

[0042] Preparation method

[0043] In the second aspect of the present application, the present application proposes a method for preparing the alloy material described in the first aspect. According to the embodiments of the present application, Figure 1 , the method comprising:

[0044] S100: Smelting process

[0045] In this step, a Ti raw material, a Cr raw material, a V raw material, and a Mn raw material are smelted to obtain a melt.

[0046] In some embodiments of the present application, an inert gas is used as a protective atmosphere during the smelting process.

[0047] In some embodiments of the present application, the inert gas includes at least one of helium, neon, argon or nitrogen.

[0048] In some embodiments of the present application, the pressure of the smelting process is -0.05 MPa to -0.03 MPa, and the pressure is regulated by an inert gas. For example, the pressure may be -0.05 MPa, -0.04 MPa, -0.03 MPa, etc., or may be in a range of any of the above values. Thus, the melting of the Ti raw material, the Cr raw material, the V raw material, and the Mn raw material can be promoted.

[0049] In some embodiments of the present application, the temperature of the smelting process is 1500° C.-2000° C. For example, the temperature may be 1500° C., 1600° C., 1700° C., 1800° C., 1900° C., 2000° C., etc., or may be a range of any of the above values. Thus, the melting of the Ti raw material, the Cr raw material, the V raw material, and the Mn raw material can be accelerated.

[0050] It should be noted that the present application does not impose any specific limitation on the time of the smelting treatment, as long as the Ti raw material, the Cr raw material, the V raw material and the Mn raw material can be completely melted.

[0051] In some embodiments of the present application, the purity of Ti in the Ti raw material is greater than 99.5%, for example, it may be 99.6%, 99.7%, 99.8%, 99.9%, 99.93%, 99.95%, 99.98%, 99.99%, 100%, etc., or it may be a range consisting of any of the above values.

[0052] In some embodiments of the present application, the purity of Cr in the Cr raw material is greater than 99.5%, for example, it may be 99.6%, 99.7%, 99.8%, 99.9%, 99.93%, 99.95%, 99.98%, 99.99%, 100%, etc., or it may be a range consisting of any of the above values.

[0053] In some embodiments of the present application, the purity of V in the V raw material is greater than 99.5%, for example, it may be 99.6%, 99.7%, 99.8%, 99.9%, 99.93%, 99.95%, 99.98%, 99.99%, 100%, etc., or it may be a range consisting of any of the above values.

[0054] In some embodiments of the present application, the purity of Mn in the Mn raw material is greater than 99.5%, for example, it may be 99.6%, 99.7%, 99.8%, 99.9%, 99.93%, 99.95%, 99.98%, 99.99%, 100%, etc., or it may be a range consisting of any of the above values.

[0055] S200: Ingot turning process

[0056] In order to ensure that the prepared alloy has uniform composition, the molten body obtained after smelting needs to be turned over to obtain a uniform alloy.

[0057] In some embodiments of the present application, the ingot turning process is performed 3-8 times, for example, 3 times, 4 times, 5 times, 6 times, 7 times, or 8 times. Thus, a uniform Ti-Cr-V-Mn quaternary alloy can be obtained.

[0058] In some embodiments of the present application, an inert gas is used as a protective atmosphere during the ingot turning process. According to an embodiment of the present application, the inert gas includes at least one of helium, neon, argon or nitrogen. In this way, unnecessary side reactions of the reactants can be avoided, thereby protecting the reactants from oxidation.

[0059] In some embodiments of the present application, the pressure of the ingot turning process is -0.05MPa to -0.03MPa, and the pressure is regulated by an inert gas. For example, the pressure may be -0.05MPa, -0.04MPa, -0.03MPa, etc., or may be a range of any of the above values. Thus, the Ti raw material, the Cr raw material, the V raw material, and the Mn raw material can be kept in a molten state, promoting the ingot turning process and making the composition more uniform.

[0060] In some embodiments of the present application, the temperature of the ingot turning process is 1500°C-2000°C. For example, the temperature may be 1500°C, 1600°C, 1700°C, 1800°C, 1900°C, 2000°C, etc., or may be a range of any of the above values. Thus, the Ti raw material, the Cr raw material, the V raw material, and the Mn raw material can be kept in a molten state, which promotes the ingot turning process and makes the composition more uniform.

[0061] In some embodiments of the present application, after the ingot turning process, a cooling process is further included to cool and shape the uniformly mixed molten body to obtain an alloy material.

[0062] The method of the present application is simple in steps and easy to operate. It can prepare a Laves phase AB2 hydrogen storage alloy material with a single and stable physical structure. The alloy material not only has a high hydrogen storage capacity and a low hydrogen release platform at room temperature, but also has a faster kinetic performance and can show high safety and cycle stability. Even at sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle fuel cell stacks. In addition, the method reduces the amount of vanadium used while ensuring excellent hydrogen storage performance, thereby reducing the cost of raw materials.

[0063] application

[0064] In the third aspect of the present application, the present application proposes a solid-state hydrogen storage device. According to an embodiment of the present application, the solid-state hydrogen storage device includes the alloy material described in the first aspect or the alloy material prepared by the method described in the second aspect as a hydrogen storage medium. As mentioned above, the hydrogen storage alloy material of the present application has a high hydrogen storage capacity, a low hydrogen release platform, and faster kinetic performance at room temperature, and can exhibit higher safety and cycle stability. As a result, the solid-state hydrogen storage device of the present application can store more hydrogen and has a lower hydrogen release pressure platform. Those skilled in the art can understand that the solid-state hydrogen storage device has all the characteristics and advantages of the alloy material described above, and will not be elaborated on here.

[0065] In the fourth aspect of the present application, the present application proposes a vehicle-mounted hydrogen storage system. According to an embodiment of the present application, the vehicle-mounted hydrogen storage system includes the alloy material described in the first aspect or the alloy material prepared by the method described in the second aspect as a hydrogen storage medium. As mentioned above, the alloy material of the present application has a high hydrogen storage capacity, a low hydrogen release platform, and faster kinetic performance, and can exhibit higher safety and cycle stability. At sub-zero temperatures, the platform pressure of the alloy can still meet the application requirements of vehicle-mounted fuel cell stacks. Therefore, the alloy material of the present application can be used in a vehicle-mounted hydrogen storage system. Those skilled in the art will understand that the vehicle-mounted hydrogen storage system has all the characteristics and advantages of the alloy material described above, and will not be elaborated on here.

[0066] The scheme of the present application will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If no specific technology or conditions are indicated in the embodiments, the technology or conditions described in the literature in this area or the product specification are carried out. The reagents used or the instruments that do not indicate the manufacturer are all conventional products that can be obtained commercially.

[0067] Example 1

[0068] According to Ti1Cr 1.1875 V 0.0625 Mn 0.75 The raw materials are added into the vacuum arc melting furnace and the vacuum is drawn to a temperature not higher than 3×10 3 Pa, then argon protective gas is introduced into the vacuum chamber until the chamber pressure range is -0.05MPa. The raw materials are arc melted, and the chamber temperature is maintained at 1675℃. Each alloy ingot is kept for 1min after being completely melted. In order to ensure the uniformity of the alloy composition, the ingot is turned over and melted 6 times. After the melting is completed, it is cooled and formed to obtain the hydrogen storage alloy material.

[0069] Example 2

[0070] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 1.125 V 0.125 Mn 0.75 The raw materials are added into the vacuum arc melting furnace according to the ratio.

[0071] Example 3

[0072] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 1.0625 V 0.1875 Mn 0.75 The raw materials are added into the vacuum arc melting furnace according to the ratio.

[0073] Example 4

[0074] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 0.75 V 0.25 Mn 0.8 The raw materials are added into the vacuum arc melting furnace according to the ratio.

[0075] Example 5

[0076] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 1.74 V 0.01 Mn 0.25 The raw materials are added into the vacuum arc melting furnace according to the ratio.

[0077] Example 6

[0078] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 0.8 V 0.2 The raw materials are added into the vacuum arc melting furnace.

[0079] Example 7

[0080] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the chamber temperature was maintained at 1500°C.

[0081] Example 8

[0082] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the chamber temperature was maintained at 1800°C.

[0083] Example 9

[0084] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that argon protective gas was introduced into the vacuum chamber until the chamber pressure range was -0.04 MPa.

[0085] Example 10

[0086] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that argon protective gas was introduced into the vacuum chamber until the chamber pressure range was -0.03 MPa.

[0087] Embodiment 11

[0088] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the ingot was turned over and melted three times.

[0089] Example 12

[0090] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the ingot was turned over and melted 8 times.

[0091] Comparative Example 1

[0092] The hydrogen storage alloy material was prepared according to the method described in Example 1, except that the Ti1Cr 1.25 Mn 0.75 The raw materials are added into the vacuum arc melting furnace according to the ratio.

[0093] The differences between Examples 1-12 and Comparative Example 1 are shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] The alloy materials prepared in Examples 1-3 were subjected to XRD testing, and the test results are as follows: Figure 2-4 As shown, it is shown that the hydrogen storage alloy material of the present application does not have a BCC phase, but is a Laves phase. At the same time, XRD detection is performed on the alloy materials prepared in Examples 4-12, and the detection results are similar to those of Examples 1-3.

[0098] The hydrogen storage capacity of the alloy materials prepared in Examples 1-3 and Comparative Example 1 was tested. The test results are as follows: Figure 5 As shown, #1 represents the alloy material of comparative example 1, #2 represents the alloy material of example 1, #3 represents the alloy material of example 2, and #4 represents the alloy material of example 3. The results show that the Ti-Cr-V-Mn quaternary alloy material of the present application has a significant improvement in hydrogen storage performance compared to the Ti-Cr-Mn ternary hydrogen storage alloy material. After adding an appropriate amount of vanadium element, the hydrogen storage performance can be improved, and the hydrogen storage capacity can be significantly increased under the same pressure. At the same time, the hydrogen storage capacity of the alloy materials prepared in Examples 4-12 was also tested, and the test results showed that the alloy materials of Examples 4-12 also have good hydrogen storage performance.

[0099] The alloy materials prepared in Examples 1-12 were subjected to low-temperature hydrogen desorption pressure testing, and the test results showed that the platform pressure of the Ti-Cr-V-Mn quaternary alloy material of the present application at low temperatures can meet the application of vehicle-mounted fuel cell stacks.

[0100] The pressure-composition-temperature (PCT) curves of the alloy materials prepared in Examples 1-12 were tested, and the test results showed that the PCT curves of the Ti-Cr-V-Mn quaternary alloy materials of the present application all had a certain slope, which could realize real-time monitoring of the hydrogen content.

[0101] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An alloy material, characterized in that: The chemical formula of the alloy material is: Ti a Cr b V c Mn d , where a=1, 0.75≤b≤1.74, 0.01≤c≤0.25, 0.25≤d≤1, and 1.8≤b+c+d≤2.

2. The alloy material according to claim 1, characterized in that: The alloy material is an AB2 type Laves phase alloy.

3. A method for preparing the alloy material according to any one of claims 1 to 2, characterized in that: include: The Ti raw material, the Cr raw material, the V raw material and the Mn raw material are smelted to obtain a molten body; The molten body is subjected to an ingot turning process to obtain the alloy material.

4. The method according to claim 3, characterized in that The smelting process and the ingot turning process are carried out in the same container; And / or, the purity of Ti in the Ti raw material is greater than 99.5%, the purity of Cr in the Cr raw material is greater than 99.5%, the purity of V in the V raw material is greater than 99.5%, and the purity of Mn in the Mn raw material is greater than 99.5%.

5. The method according to claim 4, characterized in that Inert gas is used as protective atmosphere in the container; And / or, the number of times of the ingot turning process is 3-8 times.

6. The method according to claim 5, characterized in that The inert gas includes at least one of helium, neon, argon or nitrogen.

7. The method according to claim 6, characterized in that The pressure in the container is -0.05MPa to -0.03MPa; And / or, the temperature in the container is 1500°C-2000°C.

8. A solid-state hydrogen storage device, characterized in that: The alloy material according to any one of claims 1 to 2 or the alloy material prepared by the method according to any one of claims 3 to 7 is used as the hydrogen storage medium.

9. A vehicle-mounted hydrogen storage system, characterized in that: The alloy material according to any one of claims 1 to 2 or the alloy material prepared by the method according to any one of claims 3 to 7 is used as the hydrogen storage medium.

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