A light-weight high-entropy alloy, a preparation method, a component and an end product

Abstract

The present application relates to a kind of light high-entropy alloy and preparation method, component, end product, specifically relates to metal material preparation technical field, the light high-entropy alloy includes: Al 1-8%, Cr 2-6%, Nb 12-20%, Ti 45-55%, V 12-25%, Zr 1-10%, Si 0.2-1.2%, Sn 0.2-0.8%, Mo≤6%, Ta 0.2-1.2%, W 0.2-1.2%, M≤0.6% by atomic percentage;Wherein, M includes B or C.The light high-entropy alloy provided in the present application, by introducing non-metallic element, the interaction of defect and dislocation in tensile deformation process is improved, the work hardening capacity is improved, and the light high-entropy alloy is also ensured to have good mechanical properties.Further, by optimizing preparation process to further improve work hardening capacity and mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of metal material preparation technology, specifically to a lightweight high-entropy alloy and its preparation method, components, and end products, and particularly to a high-strength, high-plasticity, lightweight high-entropy alloy containing non-metallic elements Si, B, or C, and its preparation method, components, and end products. Background Technology

[0002] Energy consumption is a major technological challenge in the aerospace field. This has made weight reduction of materials used in the manufacture of components such as high-pressure compressor discs and casings for aerospace equipment engines a highly favored research direction. Reducing material density without compromising the original properties of the metal materials is an effective measure in this field. Among them, the metal materials used for high-pressure compressor discs and casings need to balance low density, high strength, high plasticity, and a certain work hardening capacity to ensure the safety and energy efficiency of the materials during service.

[0003] Currently, lightweight high-entropy alloys possess advantages such as low density (lightweight alloys) and a wide compositional range (high-entropy alloys), which are expected to better address the current problems faced by energy-intensive high-end industrial equipment.

[0004] However, existing lightweight high-entropy alloys are almost entirely composed of metallic elements, with little research on lightweight high-entropy alloys containing non-metallic elements Si, B, and C. For example, CN118957385A discloses an Al-Cr-Fe-Ti-Si lightweight high-entropy alloy with the following molecular formula: Al a CrFeTiSi b Where 0.5≤a≤2, 0<b≤2, the density of the Al-Cr-Fe-Ti-Si alloy is 3.93-4.56 g / cm³. 3 It meets the standards for lightweight high-entropy alloys.

[0005] Although non-metallic elements have a certain effect on reducing alloy density and improving alloy strengthening and toughening mechanisms, the addition of non-metallic elements to lightweight high-entropy alloys often produces brittle non-metallic-metallic phases, which seriously deteriorates mechanical properties and also has poor work hardening ability, which is not conducive to the use of lightweight high-entropy alloys.

[0006] In summary, there is an urgent need to develop a high-performance lightweight alloy material to improve the poor work hardening ability and mechanical properties of lightweight high-entropy alloys caused by the addition of non-metallic elements, thereby expanding the composition space of lightweight high-entropy alloys. Summary of the Invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a lightweight high-entropy alloy and its preparation method, components, and end products, so as to solve the defects of poor work hardening ability and mechanical properties in lightweight high-entropy alloys due to the addition of non-metallic elements.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a lightweight high-entropy alloy, wherein the lightweight high-entropy alloy comprises, by atomic percentage:

[0010] Al 1-8%, Cr 2-6%, Nb 12-20%, Ti 45-55%, V 12-25%, Zr 1-10%, Si 0.2-1.2%, Sn0.2-0.8%, Mo≤6%, Ta 0.2-1.2%, W 0.2-1.2%, M≤0.6%;

[0011] M includes either B or C.

[0012] The lightweight high-entropy alloy provided by this invention improves the interaction between defects and dislocations during tensile deformation by introducing non-metallic elements, thereby improving its work hardening ability and ensuring that the lightweight high-entropy alloy has good mechanical properties.

[0013] As a preferred embodiment of the present invention, when M is selected as C, the percentage of atoms of M is ≤0.5%.

[0014] As a preferred embodiment of the present invention, the density of the lightweight high-entropy alloy is 5.6-5.9 g / cm³. 3 .

[0015] As a preferred technical solution of the present invention, the phase structure of the lightweight high-entropy alloy includes: a disordered BCC solid solution phase.

[0016] In a second aspect, the present invention provides a method for preparing a lightweight high-entropy alloy as described in the first aspect, the method comprising:

[0017] The ingredients are prepared according to the atomic percentage formula, and then smelted to obtain ingots;

[0018] The ingot is subjected to hot rolling and heat treatment in sequence to obtain a lightweight high-entropy alloy.

[0019] As a preferred embodiment of the present invention, the purity of the raw materials used in the ingredients is ≥99.9%.

[0020] As a preferred technical solution of the present invention, the smelting method includes: electric arc smelting.

[0021] Preferably, in the smelting process, pure titanium ingots for oxygen absorption are first smelted at least once, and then the raw materials are smelted, and the cooled alloy ingots are turned over and smelted 6-8 times to obtain cast ingots.

[0022] As a preferred technical solution of the present invention, the initial rolling temperature of the hot rolling is 890-910℃.

[0023] Preferably, the reduction per pass of the hot rolling is 0.4-0.6 mm.

[0024] Preferably, the sample is held at a temperature of 890-910℃ for 45-75 seconds before each rolling pass in the hot rolling process.

[0025] Preferably, the hot rolling ends when the total deformation reaches 88-92%.

[0026] Preferably, the heat treatment holding temperature is 890-910℃.

[0027] Preferably, the heat treatment holding time is 8-12 minutes.

[0028] Preferably, after the heat treatment and heat preservation are completed, water cooling is performed to obtain a lightweight high-entropy alloy.

[0029] Thirdly, the present invention provides a lightweight high-entropy alloy component, the lightweight high-entropy alloy component comprising: the lightweight high-entropy alloy as described in the first aspect, or the lightweight high-entropy alloy obtained by the preparation method described in the second aspect.

[0030] Fourthly, the present invention provides a terminal product, the terminal product comprising: a lightweight high-entropy alloy component as described in the third aspect.

[0031] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0032] This invention addresses the technical challenges faced by lightweight high-entropy alloys containing non-metallic elements Si, B, and C, such as the easy formation of brittle phases and imperfect preparation processes. It expands the compositional space of numerous existing lightweight high-entropy alloys composed entirely of metallic elements, and realizes the preparation of high-performance lightweight high-entropy alloys containing non-metallic elements. Attached Figure Description

[0033] Figure 1 It is Al6Cr4Nb in Embodiment 1 of the present invention 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 XRD patterns of lightweight high-entropy alloys;

[0034] Figure 2 Al6Cr4Nb in Example 1 of this invention 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 Microstructure of lightweight high-entropy alloys;

[0035] Figure 3 Al6Cr4Nb in Example 1 of this invention 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 Stress-strain curves of lightweight high-entropy alloys in tensile engineering;

[0036] Figure 4 Al2Cr4Nb in Embodiment 2 of the present invention 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 XRD patterns of lightweight high-entropy alloys;

[0037] Figure 5 Al2Cr4Nb in Embodiment 2 of the present invention 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 Microstructure of lightweight high-entropy alloys;

[0038] Figure 6 Al2Cr4Nb in Embodiment 2 of the present invention 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 Stress-strain curves of lightweight high-entropy alloys in tensile engineering.

[0039] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims. Detailed Implementation

[0040] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0041] Lightweight high-entropy alloys possess advantages such as low density (due to their lightweight nature) and a wide compositional space (due to their high entropy nature), which hold promise for better addressing the current challenges faced by energy-intensive high-end industrial equipment. While non-metallic elements can effectively reduce alloy density and improve its strengthening and toughening mechanisms, the addition of non-metallic elements to lightweight high-entropy alloys often results in brittle non-metallic-metal phases, severely deteriorating mechanical properties and exhibiting poor work hardening capabilities, thus hindering their application. Therefore, this invention optimizes the composition of lightweight high-entropy alloys to achieve excellent work hardening capabilities and mechanical properties. Furthermore, optimization of the preparation process further enhances these capabilities, as detailed below:

[0042] I. This embodiment provides a lightweight high-entropy alloy, which comprises, by atomic percentage:

[0043] Al 1-8%, Cr 2-6%, Nb 12-20%, Ti 45-55%, V 12-25%, Zr 1-10%, Si 0.2-1.2%, Sn0.2-0.8%, Mo≤6%, Ta 0.2-1.2%, W 0.2-1.2%, M≤0.6%;

[0044] M includes either B or C.

[0045] In this invention, the Al element in the lightweight high-entropy alloy is 1-8% by atomic percentage, for example, it can be 1%, 1.7%, 2.4%, 3.1%, 3.8%, 4.5%, 5.2%, 5.9%, 6.6%, 7.3% or 8%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0046] In this invention, the Cr element in the lightweight high-entropy alloy is 2-6% by atomic percentage, for example, it can be 2%, 2.4%, 2.8%, 3.2%, 3.6%, 4%, 4.4%, 4.8%, 5.2%, 5.6% or 6%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0047] In this invention, the Nb element in the lightweight high-entropy alloy is 12-20% by atomic percentage, for example, it can be 12%, 12.8%, 13.6%, 14.4%, 15.2%, 16%, 16.8%, 17.6%, 18.4%, 19.2% or 20%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0048] In this invention, the Ti element in the lightweight high-entropy alloy is 45-55% by atomic percentage, for example, it can be 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54% or 55%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0049] In this invention, the V element in the lightweight high-entropy alloy is 12-25% by atomic percentage, for example, it can be 12%, 13.3%, 14.6%, 15.9%, 17.2%, 18.5%, 19.8%, 21.1%, 22.4%, 23.7% or 25%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0050] In this invention, the Zr element in the lightweight high-entropy alloy is 1-10% by atomic percentage, for example, it can be 1%, 1.9%, 2.8%, 3.7%, 4.6%, 5.5%, 6.4%, 7.3%, 8.2%, 9.1% or 10%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0051] In this invention, the Si element in the lightweight high-entropy alloy is 0.2-1.2% in terms of atomic percentage, for example, it can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1% or 1.2%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0052] In this invention, the Sn element in the lightweight high-entropy alloy is 0.2-0.8% by atomic percentage, for example, it can be 0.2%, 0.26%, 0.32%, 0.38%, 0.44%, 0.5%, 0.56%, 0.62%, 0.68%, 0.74% or 0.8%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0053] In this invention, the Ta element in the lightweight high-entropy alloy is 0.2-1.2% in terms of atomic percentage, for example, it can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1% or 1.2%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0054] In this invention, the W element in the lightweight high-entropy alloy is 0.2-1.2% in terms of atomic percentage, for example, it can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1% or 1.2%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0055] In this invention, the Mo element in the lightweight high-entropy alloy is ≤6% by atomic percentage, for example, it can be 6%, 5.4%, 4.8%, 4.2%, 3.6%, 3%, 2.4%, 1.8%, 1.2%, 0.6% or 0%, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0056] In this invention, the component M in the lightweight high-entropy alloy is ≤0.6% in terms of atomic percentage. For example, it can be 0.6%, 0.55%, 0.5%, 0.45%, 0.4%, 0.35%, 0.3%, 0.25%, 0.2%, 0.15%, or 0.1%, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0057] When M is selected as element C, the percentage of atoms of M is ≤0.5%, for example, it can be 0.5%, 0.46%, 0.42%, 0.38%, 0.34%, 0.3%, 0.26%, 0.22%, 0.18%, 0.14% or 0.1%, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0058] In this invention, the total percentage of all atoms in the lightweight high-entropy alloy is 100%.

[0059] The density of the lightweight high-entropy alloy is 5.6-5.9 g / cm³. 3 For example, it could be 5.6 g / cm³ 3 5.63 g / cm 3 5.66 g / cm 3 5.69 g / cm 3 5.72 g / cm 3 5.75g / cm 3 5.78 g / cm 35.81 g / cm 3 5.84 g / cm 3 5.87 g / cm 3 Or 5.9g / cm 3 The values ​​may include, but are not limited to, the listed values; other unlisted values ​​within this range also meet the requirements.

[0060] The phase structure of the lightweight high-entropy alloy includes a disordered BCC solid solution phase.

[0061] The lightweight high-entropy alloy provided by this invention introduces non-metallic elements to improve the interaction between defects and dislocations during tensile deformation, thereby improving its work hardening ability and mechanical properties.

[0062] II. This embodiment provides a method for preparing a lightweight high-entropy alloy, as detailed below:

[0063] The ingredients are prepared according to the atomic percentage formula, and then smelted to obtain ingots;

[0064] The ingot is subjected to hot rolling and heat treatment in sequence to obtain a lightweight high-entropy alloy.

[0065] The purity of the raw materials used in the ingredients is ≥99.9%.

[0066] In this invention, the raw materials used in the batching can be selected as rods, ingots, etc., and the size of the raw materials can be reasonably designed according to the conventional requirements in the field. Before smelting, each raw material can be cleaned to remove the oxide layer, rust, oil stains, dust and other impurities on the surface of the raw materials.

[0067] In this invention, the specific requirements for smelting can be reasonably designed according to conventional requirements in the field. For example, after the raw materials are batched, they are placed in the smelting crucible according to the strategy of placing low-melting-point pure metals in the lower layer and higher-melting-point metal elements in the upper layer. At the same time, pure titanium raw materials are added to absorb oxygen. After the pure metal raw materials are loaded, a vacuum is drawn. When the vacuum degree of the furnace cavity reaches 3.0 × 10⁻⁶, the smelting process is complete. -3 -4.5×10 -3 After vacuuming is completed, the argon filling valve and argon cylinder valve are opened to fill high-purity argon gas to -0.08~0.06MPa. After vacuuming is completed, melting begins. After melting is completed, the ingot is cooled to obtain the ingot.

[0068] The smelting method includes: electric arc smelting.

[0069] In the smelting process, pure titanium ingots for oxygen absorption are first smelted at least once, and then the raw materials are smelted. The cooled alloy ingots are then turned over and smelted 6-8 times to obtain cast ingots.

[0070] The initial rolling temperature of the hot rolling is 890-910℃, for example, it can be 890℃, 892℃, 894℃, 896℃, 898℃, 900℃, 902℃, 904℃, 906℃, 908℃ or 910℃, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0071] The reduction per hot rolling pass is 0.4-0.6 mm, for example, it can be 0.4 mm, 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm or 0.6 mm, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0072] In the hot rolling process, the sample is held at a temperature of 890-910℃ for 45-75 seconds before each rolling pass. For example, it can be 45 seconds, 50 seconds, 55 seconds, 60 seconds, 65 seconds, 70 seconds, or 75 seconds, but it is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0073] The endpoint of hot rolling is when the total deformation reaches 88-92%, for example, it can be 88%, 88.5%, 89%, 89.5%, 90%, 90.5%, 91%, 91.5% or 92%, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0074] The heat treatment holding temperature is 890-910℃, for example, it can be 890℃, 892℃, 894℃, 896℃, 898℃, 900℃, 902℃, 904℃, 906℃, 908℃ or 910℃, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0075] The heat treatment holding time is 8-12 min, for example, it can be 8 min, 8.4 min, 8.8 min, 9.2 min, 9.6 min, 10 min, 10.4 min, 10.8 min, 11.2 min, 11.6 min or 12 min, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0076] The lightweight high-entropy alloy is obtained by water cooling after the heat treatment and heat preservation are completed.

[0077] In this invention, the combination of hot rolling and heat treatment during the preparation of lightweight high-entropy alloys can eliminate casting defects, refine grains, and improve their mechanical properties and work hardening ability.

[0078] III. This embodiment provides a lightweight high-entropy alloy component, which includes: a lightweight high-entropy alloy, or a lightweight high-entropy alloy obtained by a preparation method.

[0079] In this invention, the lightweight high-entropy alloy component is specifically a structural component made of lightweight high-entropy alloy, that is, a structural component with lightweight and high strength, such as a high-pressure compressor disc and casing.

[0080] Fourthly, this embodiment provides a terminal product, which includes: a lightweight high-entropy alloy component as described in the third aspect.

[0081] In this invention, the end product is a product that includes lightweight high-entropy alloy components, specifically a semi-finished product or a finished product, such as an aero engine including a high-pressure compressor disc and a casing, and further, an aircraft.

[0082] V. To illustrate the performance achievable by the lightweight high-entropy alloy provided by this invention, the following examples are used for explanation:

[0083] In this invention, the tensile mechanical properties of the alloy are tested according to GB / T 228.1-2021 Metallic materials, tensile testing, Part 1: Room temperature test method; the alloy density is tested according to Archimedes' displacement method; and the work hardening capacity is determined according to the procedure of group standard T / CSTM 00514—2022 "Determination of tensile strain hardening properties of metallic materials".

[0084] Example 1

[0085] This embodiment provides a high-strength, high-ductility, lightweight, high-entropy alloy containing non-metallic elements Si, B, and C, named Al-Cr-Nb-Ti-V-Zr-Sn-Ta-W-Si-M, with the following composition:

[0086] Al6Cr4Nb 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 (at.%, percentage of atoms)

[0087] The preparation method is as follows:

[0088] Step 1: Prepare the ingredients according to the proportions, melt them after preparation, and cool them to obtain the lightweight high-entropy alloy button-shaped ingot.

[0089] Step 2: The molten button-shaped ingot is processed into a rolled sample with a thickness of 10mm by electrical discharge wire cutting, and then the sample is hot rolled to eliminate casting defects.

[0090] Step 3: Heat treat the rolled sample to eliminate deformed structures and improve alloy properties.

[0091] The lightweight high-entropy alloy raw material is 99.90% pure metal particles;

[0092] The lightweight high-entropy alloy is prepared by electric arc furnace melting;

[0093] When smelting the lightweight high-entropy alloy, the pure titanium ingot used for oxygen absorption is first smelted once, and then the lightweight high-entropy alloy is flipped over and smelted seven times.

[0094] The hot rolling and recrystallization annealing process parameters for the lightweight high-entropy alloy are as follows: the hot rolling temperature is 900℃, the reduction per pass is 0.5mm, the sample is held at 900℃ for 10min at the beginning of hot rolling, and the sample is held at 900℃ for 60s before each subsequent rolling pass; after rolling, the sample is heat treated at 900℃ for 10min, and water cooling is performed by water quenching to obtain the final sample.

[0095] Phase composition, microstructure and mechanical properties of Al-Cr-Nb-Ti-V-Zr-Sn-Ta-W-Si-M high-strength, high-plasticity, lightweight, and high-entropy alloy containing non-metallic elements Si and B from Example 1 were tested.

[0096] Figure 1 Al6Cr4Nb 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 The XRD pattern of the lightweight high-entropy alloy shows that it has a single-phase BCC crystal structure.

[0097] Figure 2 Al6Cr4Nb 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6 W 0.6 Si 0.9 B 0.4 Microstructure of the lightweight high-entropy alloy shows that the alloy is composed of equiaxed crystals.

[0098] Figure 3 Al6Cr4Nb 15 Ti 50 V 20 Zr2Sn 0.5 Ta 0.6W 0.6 Si 0.9 B 0.4 Stress-strain curves of lightweight high-entropy alloys in tensile engineering.

[0099] The results show that the lightweight high-entropy alloy (density of 5.6 g / cm³) provided in this embodiment has a yield strength of 983.0 MPa, a tensile strength of 1038.5 MPa, a fracture elongation of 17.9%, a uniform elongation under true stress-strain of 7.5%, and a work hardening rate of 1792 MPa.

[0100] Example 2

[0101] This embodiment provides a high-strength, high-ductility, lightweight, high-entropy alloy containing non-metallic elements Si and C, named Al-Cr-Nb-Ti-V-Zr-Sn-Ta-W-Si-M, with the following composition:

[0102] Al2Cr4Nb 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 (at.%, percentage of atoms)

[0103] The preparation method is the same as in Example 1.

[0104] Figure 4 Al2Cr4Nb 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 The XRD pattern of the lightweight high-entropy alloy shows that it has a single-phase BCC crystal structure.

[0105] Figure 5 Al2Cr4Nb 15 Ti 50 V 15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 Microstructure of the lightweight high-entropy alloy shows that the alloy is composed of equiaxed crystals.

[0106] Figure 6 Al2Cr4Nb 15 Ti 50 V15 Zr7Sn 0.5 Mo4Ta 0.9 W 0.9 Si 0.5 C 0.2 Stress-strain curves of lightweight high-entropy alloys in tensile engineering.

[0107] The results show that the lightweight high-entropy alloy (density of 5.9 g / cm³) provided in this embodiment has a yield strength of 1032.3 MPa, a tensile strength of 1077.7 MPa, a fracture elongation of 7.4%, a uniform elongation under true stress-strain of 6.7%, and a work hardening rate of 1873 MPa.

[0108] In summary, the Al-Cr-Nb-Ti-V-Zr-Sn-Ta-W-Si-M alloy (M being B or C) containing non-metallic elements Si, B, and C provided by this invention improves the interaction between defects and dislocations during tensile deformation by introducing non-metallic elements, thereby enhancing its work hardening ability. Simultaneously, it ensures that the lightweight high-entropy alloy possesses excellent mechanical properties, with a density ≤5.9 g / cm³. 3 It has a yield strength ≥983.0MPa, tensile strength ≥1038.5MPa, elongation at break ≥7.4%, uniform elongation ≥6.7%, and work hardening rate ≥1792MPa, and has advantages in density and work hardening ability.

[0109] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0110] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0111] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A lightweight high-entropy alloy, characterized in that, The lightweight high-entropy alloy comprises, by atomic percentage: Al 1-8%, Cr 2-6%, Nb 12-20%, Ti 45-55%, V 12-25%, Zr 1-10%, Si 0.2-1.2%, Sn 0.2-0.8%, Mo≤6%, Ta 0.2-1.2%, W 0.2-1.2%, M≤0.6%; M includes either B or C.

2. The lightweight high-entropy alloy as described in claim 1, characterized in that, When M is selected as C, the percentage of atoms of M is ≤0.5%.

3. The lightweight high-entropy alloy as described in claim 1, characterized in that, The density of the lightweight high-entropy alloy is 5.6-5.9 g / cm³. 3 .

4. The lightweight high-entropy alloy as described in claim 1, characterized in that, The phase structure of the lightweight high-entropy alloy includes: a disordered BCC solid solution phase.

5. A method for preparing a lightweight high-entropy alloy as described in any one of claims 1-4, characterized in that, The preparation method includes: The ingredients are prepared according to the atomic percentage formula, and then smelted to obtain ingots; The ingot is subjected to hot rolling and heat treatment in sequence to obtain a lightweight high-entropy alloy.

6. The preparation method according to claim 5, characterized in that, The purity of the raw materials used in the ingredients is ≥99.9%.

7. The preparation method according to claim 5, characterized in that, The smelting method includes: electric arc smelting; Preferably, in the smelting process, pure titanium ingots for oxygen absorption are first smelted at least once, and then the raw materials are smelted, and the cooled alloy ingots are turned over and smelted 6-8 times to obtain cast ingots.

8. The preparation method according to claim 5, characterized in that, The initial rolling temperature of the hot rolling is 890-910℃; Preferably, the reduction per pass of the hot rolling is 0.4-0.6 mm; Preferably, the sample is held at a temperature of 890-910℃ for 45-75 seconds before each rolling pass in the hot rolling process; Preferably, the hot rolling endpoint is when the total deformation reaches 88-92%; Preferably, the heat treatment holding temperature is 890-910℃; Preferably, the heat treatment holding time is 8-12 minutes; Preferably, after the heat treatment and heat preservation are completed, water cooling is performed to obtain a lightweight high-entropy alloy.

9. A lightweight high-entropy alloy component, characterized in that, The lightweight high-entropy alloy component comprises: the lightweight high-entropy alloy as described in any one of claims 1-4, or the lightweight high-entropy alloy obtained by the preparation method as described in any one of claims 5-8.

10. A terminal product, characterized in that, The end product includes: the lightweight high-entropy alloy component as described in claim 9.

Images