A lightweight, high-strength, high-entropy Al alloy bulk material, its preparation method, and its application.

Abstract

This invention discloses a lightweight, high-strength, high-entropy Al alloy bulk material, its preparation method, and its applications. The atomic percentage expression for this high-entropy Al alloy bulk material is: Al a Mg b Li c Zn d The atomic percentages of each component are: 40≤a≤80at%, 15≤b≤50at%, 0<c≤20at%, 0<d≤20at%, and a+b+c+d=100%. This invention involves designing the alloy composition and then controlling the structure of an AlMgLiZn-based lightweight high-entropy alloy through different high-temperature and high-pressure treatments. This transforms various brittle intermetallic compound phases in the initial alloy into a face-centered cubic solid solution, which enhances grain boundary bonding and suppresses the formation of early-stage intergranular cracks during deformation. The final alloy has a density of 2.4–2.86 g / cm³. 3 This lightweight, high-strength, high-entropy Al alloy bulk material has a compressive strength of 600-980 MPa and a compressive plasticity of 2.5%-35% at room temperature. This alloy can be used to manufacture parts and structural components for aviation transportation equipment and has broad application prospects.

Description

Technical Field

[0001] This invention belongs to the field of functional materials, and particularly relates to a lightweight, high-strength, high-entropy Al alloy bulk material, its preparation method, and its application. Background Technology

[0002] Lightweight alloys possess characteristics such as low density, high specific strength, and high specific modulus, leading to their widespread application in aerospace, automotive, electronics, and military fields. Due to their low density, lightweight alloys can significantly reduce the weight of structural components, improve fuel efficiency, and reduce energy consumption, particularly crucial for emission reduction and performance enhancement in the aerospace and automotive industries. With continuous technological advancements, the research and application prospects of lightweight alloys are vast. For example, aluminum alloys account for a significant portion of applications in the aerospace field, substantially reducing energy consumption and contributing to energy conservation and emission reduction. However, because their main constituent element is a single element, there are limitations in pursuing more comprehensive physicochemical and mechanical properties. Typically, aluminum alloys contain more than 85 at%, and further reducing density requires the introduction of more lightweight elements. However, exceeding the solubility limits of these elements in aluminum may result in alloys primarily composed of intermetallic compounds (IMCs), lacking a ductile face-centered cubic matrix, thus leading to deterioration in mechanical properties. Furthermore, strength typically decreases with decreasing density, making the achievement of high specific strength in aluminum alloys a significant challenge.

[0003] "High entropy" is a new materials design theory that has emerged in recent years. High-entropy alloys are alloy materials composed of multiple principal components. Due to the high mixing entropy, lattice distortion, short chemical order, and slow diffusion resulting from the "high entropy effect," they possess unique structural characteristics, including distinctive performance properties. Compared to traditional alloys, high-entropy alloys exhibit higher solid solution stability, superior mechanical properties (such as high strength and high hardness), and excellent corrosion resistance and oxidation resistance. Because of their multi-component design philosophy, the physical and chemical properties of high-entropy alloys often demonstrate superior performance compared to traditional alloys, enabling them to operate stably for extended periods under extreme conditions (such as high temperature, high pressure, or corrosive environments).

[0004] By utilizing the high-entropy concept to dissolve more lightweight elements in Al alloys, high-entropy Al alloys can be designed, potentially leading to the development of novel aluminum alloys with excellent comprehensive mechanical properties. Currently, the significant differences in atomic radius and electronegativity between aluminum and other lightweight elements result in high mixing enthalpy and low excess entropy in the system. Under these conditions, chemically ordered integral matrix structures (IMCs) are more easily formed, leading to a deterioration in the mechanical properties of the alloy. Therefore, there is an urgent need to develop high-performance high-entropy Al alloy materials with face-centered cubic solid solutions as the matrix phase and their preparation methods. Summary of the Invention

[0005] This invention discloses a high-entropy Al alloy material with excellent comprehensive mechanical properties and its preparation method, in order to solve any of the above-mentioned and other potential problems of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a lightweight, high-strength, high-entropy Al alloy bulk material, wherein the atomic percentage expression of the high-entropy Al alloy bulk material is Al a Mg b Li c Zn d The atomic percentage of each component is: 40≤a≤80at%, 15≤b≤50at%, 0<c≤20at%, 0<d≤20at%, and a+b+c+d=100at%.

[0007] Furthermore, the high-entropy Al alloy bulk material also includes M. e M is at least one of Cu, Y, La or Ce, and 0 ≤ e ≤ 20at.

[0008] Furthermore, the lightweight, high-strength, high-entropy Al alloy bulk material has a face-centered cubic solid solution structure composed of multiple principal metallic elements.

[0009] Furthermore, when M is Cu, a = 70 at%, b = 15 at%, c = 5 at%, d = 5 at%, e = 5 at%, the expression for the atomic percentage of the high-entropy Al alloy bulk material is: Al 70 Mg 15 Li5Zn5Cu5 has a density of 2.7 g / cm³. 3 At room temperature, the compressive strength is 770 MPa and the compressive plasticity is 31%.

[0010] Furthermore, when a = 40.0 at%, b = 40.0 at%, c = 10.0 at%, and d = 10.0 at%, the expression for the atomic percentage of the high-entropy Al alloy bulk material is: Al 40 Mg 40 Li 10 Zn 10 Its density is 2.54 g / cm³. 3 At room temperature, the compressive strength is 880 MPa and the compressive plasticity is 2.5%.

[0011] Another object of the present invention is to provide a method for preparing the above-mentioned high-entropy Al alloy material, the method specifically including the following steps:

[0012] S1) Weigh each raw material according to the designed proportions. The purity of the raw materials exceeds 99.9%. Remove the surface oxide layer and ultrasonically clean them in ethanol or acetone. (Raw materials include Al, Mg, Li, Zn, Cu, Y, La, Ce)

[0013] S2) The raw materials processed in S1) are alloyed using a vacuum induction melting furnace to obtain alloy ingots;

[0014] S3) Using a two-stage large press, the alloy ingot obtained in S2) is subjected to high temperature and high pressure treatment to obtain a lightweight, high-strength, high-entropy Al alloy bulk material with a face-centered cubic solid solution phase.

[0015] Furthermore, the specific process parameters in S2) are as follows: the melting atmosphere is high-purity argon; the melting temperature is 700-900℃.

[0016] Furthermore, in S3), the high pressure range is 10-15 GPa, the high temperature range is 1000-1500 K, and the heat preservation time is 5-10 min.

[0017] Furthermore, the density of the lightweight, high-strength, high-entropy Al alloy bulk material prepared by the aforementioned method is 2.4-2.86 g / cm³. 3 At room temperature, the compressive strength is 600-980 MPa, and the compressive plasticity is 2.5%-35%.

[0018] The aforementioned lightweight, high-strength, high-entropy Al alloy bulk material is applied to the preparation of parts and structural components for aerospace transportation equipment. Furthermore, the raw materials used for weighing are selected from Al, Mg, Li, Zn, Cu, Y, La, and Ce with a purity exceeding 99.9%.

[0019] Furthermore, the high pressure range is 10-15 GPa, the high temperature range is 1000-1500 K, and the heat preservation time is 5-10 min.

[0020] A lightweight, high-strength, high-entropy Al alloy bulk material is applied to the preparation of parts and structural components for aviation transportation equipment.

[0021] The mechanism of this invention is as follows: This invention achieves high solid solubility of elements in Al through high temperature and high pressure, thereby synthesizing supersaturated solid solutions.

[0022] Among them, the density of Mg is only 1.74 g / cm³. 3 The addition of Mg can significantly reduce the density of Al alloys, improve their strength, hardness, corrosion resistance, oxidation resistance and heat treatment performance, and improve the processing performance of aluminum alloys.

[0023] Li has a density of only 0.53 g / cm³. 3The addition of lithium can significantly reduce the density of the alloy, resulting in a substantial advantage in specific strength, and improve the alloy's strength, plasticity, and fatigue resistance. Furthermore, the addition of lithium lowers the alloy's coefficient of thermal expansion, making it less prone to large volume changes with temperature variations, thus enabling high-precision applications.

[0024] The appropriate addition of Cu to Al can enhance the high-temperature strength of aluminum alloys, thereby improving their high-temperature performance. The addition of Y to Al can refine the grains, helping to improve the mechanical properties of the alloy, especially strength and toughness, and also improving the stability of the aluminum alloy at high temperatures. Ce can improve the casting and machinability of aluminum alloys. During the casting process of Al alloys, Ce can help reduce casting defects (such as porosity and shrinkage), making the aluminum alloy castings denser and improving machinability. The addition of La to Al can improve its high-temperature strength, oxidation resistance, and corrosion resistance; improve the grain structure of Al alloys, increase the thermal stability of Al alloys, and also help reduce the rupture of the oxide film in the alloy, improving its performance in high-temperature environments.

[0025] The beneficial effects of this invention are: by adopting the above technical solution, this invention provides a new approach for developing more lightweight high-entropy alloys by combining the proportion of components with high temperature and high pressure to prepare AlMgLiZn-based lightweight high-entropy alloys with face-centered cubic solid solution phase.

[0026] The provided series of AlMgLiZn-based lightweight high-entropy alloys with face-centered cubic solid solution phases can be rationally controlled in terms of composition and high-temperature and high-pressure preparation conditions according to actual application requirements. Therefore, the alloy has a wide range of applicable compositions and broad preparation conditions.

[0027] The lightweight, high-strength, high-entropy Al alloy material prepared by the method of this invention has a density of 2.4-2.86 g / cm³. 3 At room temperature, the compressive strength is 600-980 MPa, and the compressive plasticity is 2.5%-35%. Attached Figure Description

[0028] Figure 1 For the as-cast Al of the present invention 70 Mg 15 XRD pattern of Li5Zn5Cu5 alloy.

[0029] Figure 2 For the as-cast Al of the present invention 70 Mg 15 Room temperature compression curve of Li5Zn5Cu5 alloy.

[0030] Figure 3 The face-centered cubic structure Al of the present invention 70 Mg 15XRD pattern of Li5Zn5Cu5 alloy.

[0031] Figure 4 The face-centered cubic structure Al of the present invention 70 Mg 15 Room temperature compression curve of Li5Zn5Cu5 alloy.

[0032] Figure 5 The as-cast and face-centered cubic Al structures of the present invention 70 Mg 15 SEM image of the microstructure of Li5Zn5Cu5 alloy.

[0033] Figure 6 For the as-cast Al of the present invention 40 Mg 40 Li 10 Zn 10 XRD pattern of the alloy.

[0034] Figure 7 For the as-cast Al of the present invention 40 Mg 40 Li 10 Zn 10 Room temperature compression curve of the alloy.

[0035] Figure 8 Al is based on the face-centered cubic structure of the present invention. 40 Mg 40 Li 10 Zn 10 XRD pattern of the alloy.

[0036] Figure 9 Al is based on the face-centered cubic structure of the present invention. 40 Mg 40 Li 10 Zn 10 Room temperature compression curve of the alloy.

[0037] Figure 10 Al is based on the as-cast and face-centered cubic structures of this invention. 40 Mg 40 Li 10 Zn 10 SEM image of the microstructure of the alloy. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific comparative examples and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0039] This invention discloses a lightweight, high-strength, high-entropy Al alloy bulk material, characterized in that the atomic percentage expression of the high-entropy alloy is Al a Mg b Li c Zn d M e The atomic percentages of M = (Cu, Y, La, Ce) are: 40 ≤ Al ≤ 80 at%, 15 ≤ Mg ≤ 50 at%, 0 < Li ≤ 20 at%, 0 < Zn ≤ 20 at%, and a + b + c + d + e = 100.

[0040] The lightweight, high-strength, and high-entropy Al alloy bulk material has a face-centered cubic solid solution phase structure composed of multiple principal metallic elements.

[0041] The lightweight, high-strength, high-entropy Al alloy bulk material has low density, high strength, and certain plasticity, while also possessing high specific fracture strength.

[0042] When M is Cu, a = 70.0, b = 15.0, c = 5.0, d = 5.0, e = 5.0, the expression for the atomic percentage of the high-entropy alloy is Al. 70 Mg 15 The density of the face-centered cubic solid solution material synthesized under high temperature and pressure (THP) of Li₅Zn₅Cu₅ is 2.7 g / cm³. 3 The maximum compressive strength at room temperature is 770 MPa, and the plasticity reaches ~31%.

[0043] When a = 40.0, b = 40.0, c = 10.0, and d = 10.0, the expression for the atomic percentage of the high-entropy alloy is Al. 40 Mg 40 Li 10 Zn 10 The density of the face-centered cubic solid solution material synthesized under high temperature and pressure is only 2.54 g / cm³. 3 The maximum compressive strength at room temperature is 880 MPa, and the plasticity is ~2.5%.

[0044] Another object of the present invention is to provide a method for preparing the above-mentioned lightweight, high-strength, high-entropy Al alloy material, the method specifically comprising the following steps:

[0045] Step 1: Raw material preparation: Use pure elements as raw materials, remove the oxide layer and impurities of the metal elements, and ultrasonically clean them in ethanol or acetone;

[0046] Step 2: Weighing: Calculate the mass of each element according to the atomic ratio of each component, and weigh and mix them.

[0047] Step 3: Alloy smelting: Alloy smelting is carried out using a vacuum induction melting furnace to obtain alloy ingots;

[0048] Step 4: High temperature and high pressure treatment: The obtained alloy ingot is subjected to high temperature and high pressure treatment using a two-stage large press to obtain the lightweight, high-strength, high-entropy Al bulk alloy material with face-centered cubic solid solution phase.

[0049] The raw materials used for weighing are Al, Mg, Li, Zn, Cu, Y, La, and Ce with a purity exceeding 99.9%. Among them, Y is added using an AlY master alloy.

[0050] The high pressure range is 10-15 GPa, the high temperature range is 1000-1500 K, and the heat preservation time is 5-10 min.

[0051] Example 1

[0052] Al 70 Mg 15 The preparation process of Li5Zn5Cu5 light high entropy is as follows:

[0053] (1) Raw material preparation: Pure elements are used as raw materials. The oxide layer and impurities of the metal elements are removed and ultrasonically cleaned in ethanol or acetone. The Li element is kept in the glove box for a long time. When using it, the surface oxide scale is removed with a blade in the glove box, and then the sample without oxide scale is cut out. After mixing the materials in the glove box, it is ready to be melted.

[0054] (2) Weighing: The mass of each element is calculated according to the atomic ratio of each component, and the precise weighing ratio is carried out using a precision electronic balance; for use in smelting alloys, the Li element is handled in the glove box;

[0055] (3) Alloy melting: The ingot is prepared using a high-vacuum induction melting furnace. Pure metals are placed into crucibles in sequence and induction melting is carried out in a high-purity argon atmosphere. After the alloy melts, it is poured into a mold to obtain a cast alloy ingot.

[0056] (4) High-temperature and high-pressure treatment: The obtained alloy ingot was subjected to high-temperature and high-pressure treatment at 10 GPa / 1000 K using a two-stage high-pressure press. First, the alloy sample was assembled in a primary and secondary stage. Then, the pressure was gradually increased to 10 GPa, and then heated to 1000 K, with the pressure and temperature gradually increased until the set value was reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state was maintained for 5 minutes to ensure that the sample underwent the required phase transformation. After the experiment, the temperature was lowered to room temperature, and then the pressure was gradually reduced to atmospheric pressure to avoid drastic changes that could damage the sample or equipment. Finally, the high-temperature and high-pressure sample was taken out for subsequent analysis.

[0057] The obtained as-cast and high-temperature, high-pressure alloy ingots were prepared into samples of certain specifications for testing and characterization.

[0058] The structural and property characterizations of the as-cast and high-temperature, high-pressure alloys prepared by the above methods are as follows:

[0059] (5) Material phase characterization and mechanical property testing:

[0060] Figure 1 The Al obtained above 70 Mg 15 The XRD pattern of the Li5Zn5Cu5 as-cast sample material indicates that its main phases are face-centered cubic solid solution and various intermetallic compound phases, including Li3CuAl5. Figure 2 The Al obtained above 70 Mg 15 The room temperature compressive stress-strain diagram of the Li5Zn5Cu5 as-cast sample material shows that its maximum room temperature compressive strength is 433 MPa and its fracture strain is 19%. Figure 3 The Al obtained above 70 Mg 15 The XRD pattern of the Li5Zn5Cu5 high-temperature and high-pressure sample material shows that it is composed of a single-phase face-centered cubic solid solution phase. Therefore, it can be seen that after high-temperature and high-pressure treatment, the structure of the compound in the sample is transformed into a single-phase face-centered cubic solid solution phase structure. Figure 4 The Al obtained above 70 Mg 15 The room temperature compressive stress-strain diagram of the Li5Zn5Cu5 high-temperature and high-pressure sample material shows that its maximum compressive yield strength at room temperature is 770 MPa and the fracture strain is 31%. This indicates that the strength and plasticity of the synthesized single-phase face-centered cubic solid solution alloy have been significantly improved. Figure 5 The Al obtained above 70 Mg 15 SEM images of the microstructure of Li5Zn5Cu5 as-cast and high-temperature-high-pressure samples clearly show the microstructure of at least two phases in the as-cast sample. After high-temperature-high-pressure treatment, a single-phase homogeneous face-centered cubic solid solution phase was obtained.

[0061] Example 2

[0062] Al 40 Mg 40 Li 10 Zn 10 The preparation process of lightweight high-entropy materials is as follows:

[0063] (1) Raw material preparation: Pure elements are used as raw materials. The oxide layer and impurities of the metal elements are removed and ultrasonically cleaned in ethanol or acetone. The Li element is kept in the glove box for a long time. When using it, the surface oxide scale is removed with a blade in the glove box, and then the sample without oxide scale is cut out. After mixing the materials in the glove box, it is ready to be melted.

[0064] (2) Weighing: The mass of each element is calculated according to the atomic ratio of each component, and the precise weighing ratio is carried out using a precision electronic balance; for use in smelting alloys, the Li element is handled in the glove box;

[0065] (3) Alloy melting: The ingot is prepared using a high-vacuum induction melting furnace. Pure metals are placed into crucibles in sequence and induction melting is carried out in a high-purity argon atmosphere. After the alloy melts, it is poured into a mold to obtain a cast alloy ingot.

[0066] (4) High-temperature and high-pressure treatment: The obtained alloy ingot was subjected to high-temperature and high-pressure treatment at 10 GPa / 1000 K using a two-stage high-pressure press. First, the alloy sample was assembled in a primary and secondary stage. Then, the pressure was gradually increased to 10 GPa, and then heated to 1000 K, with the pressure and temperature gradually increased until the set value was reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state was maintained for 8 minutes to ensure that the sample underwent the required phase transformation. After the experiment, the temperature was lowered to room temperature, and then the pressure was gradually reduced to atmospheric pressure to avoid drastic changes that could damage the sample or equipment. Finally, the high-temperature and high-pressure sample was taken out for subsequent analysis.

[0067] The obtained as-cast and high-temperature, high-pressure alloy ingots were prepared into samples of certain specifications for testing and characterization.

[0068] The structural and property characterizations of the as-cast and high-temperature, high-pressure alloys prepared by the above methods are as follows:

[0069] (5) Material phase characterization and mechanical property testing:

[0070] Figure 6 The Al obtained above 40 Mg 40 Li 10 Zn 10 The XRD patterns of the as-cast sample material indicate that its main phases are multiple intermetallic compound phases, including Al. 12 Mg 17 , Al3Mg2, MgZn2, and LiMgAl2. Figure 7 The Al obtained above 40 Mg 40 Li 10 Zn 10 The room temperature compressive stress-strain diagram of the as-cast sample material shows that its maximum room temperature compressive strength is ~226MPa and its fracture strain is <1%. Figure 8 The Al obtained above 40 Mg 40 Li 10 Zn 10The XRD pattern of the high-temperature and high-pressure sample material shows that its main phase is face-centered cubic solid solution, with some intermetallic compound structures also present. This indicates that after high-temperature and high-pressure treatment, the multiphase compound structure in the sample transforms into a structure with face-centered cubic solid solution as the matrix. Figure 9 The Al obtained above 40 Mg 40 Li 10 Zn 10 The room temperature compressive stress-strain diagram of the high temperature and high pressure sample material shows that its room temperature compressive yield strength is 880 MPa and the fracture strain is ~2.5%. This indicates that the strength and plasticity of the synthesized alloy with face-centered cubic solid solution as the matrix are greatly improved. Figure 10 The Al obtained above 40 Mg 40 Li 10 Zn 10 SEM images of the microstructure of the as-cast and high-temperature-high-pressure sample materials clearly show the microstructure of the as-cast multiphase intermetallic compounds. After high-temperature-high-pressure treatment, a microstructure was formed with face-centered cubic solid solution (black phase) as the matrix and some compound phases (white phase).

[0071] Example 3

[0072] Al 70 Mg 17 The preparation process of Li5Zn5Y3 lightweight high-entropy material is as follows:

[0073] (1) Raw material preparation: Pure elements are used as raw materials. Y is added with AlY intermediate alloy to remove the oxide layer and impurities of the metal elements and ultrasonically cleaned in ethanol or acetone. Li elements are kept in the glove box for a long time. When using, the surface oxide scale is removed with a blade in the glove box, and then the sample without oxide scale is cut out. After the materials are prepared in the glove box, wait for melting.

[0074] (2) Weighing: Calculate the mass of each element and the AlY master alloy according to the atomic ratio of each component, and use a precision electronic balance to weigh and mix them accurately; for use in smelting the alloy, the Li element is handled in the glove box;

[0075] (3) Alloy melting: The ingot is prepared using a high-vacuum induction melting furnace. Pure metal and AlY master alloy are placed into a crucible in sequence and induction melting is carried out in a high-purity argon atmosphere. After the alloy melts, it is poured into a mold to obtain a cast alloy ingot.

[0076] (4) High-temperature and high-pressure treatment: The obtained alloy ingot was subjected to high-temperature and high-pressure treatment at 12 GPa / 1200 K using a two-stage high-pressure press. First, the alloy sample was assembled in a primary and secondary stage. Then, the pressure was gradually increased to 12 GPa, and then heated to 1200 K, with the pressure and temperature gradually increased until the set values ​​were reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state was maintained for 8 minutes to ensure that the sample underwent the required phase transformation. After the experiment, the temperature was lowered to room temperature, and then the pressure was gradually reduced to atmospheric pressure to avoid drastic changes that could damage the sample or equipment. Finally, the high-temperature and high-pressure sample was taken out for subsequent analysis.

[0077] The obtained as-cast and high-temperature, high-pressure alloy ingots were prepared into samples of certain specifications for testing and characterization.

[0078] The structural and property characterizations of the as-cast and high-temperature, high-pressure alloys prepared by the above methods are as follows:

[0079] (5) Material phase characterization and mechanical property testing:

[0080] The Al obtained above 70 Mg 17 The main phases of the as-cast Li5Zn5Y3 sample are face-centered cubic solid solution and various intermetallic compound phases. Its maximum compressive strength at room temperature is 451 MPa, and its fracture strain is 17%. The Al obtained above... 70 Mg 17 The Li5Zn5Y3 high-temperature and high-pressure sample material is mainly composed of a single-phase face-centered cubic solid solution phase. Its maximum compressive yield strength at room temperature is 813 MPa, and its fracture strain is 33%. Example 4

[0081] Al 67 Mg 15 The preparation process of Li5Zn5Cu5Y3 lightweight high-entropy material is as follows:

[0082] (1) Raw material preparation: Pure elements are used as raw materials. Y is added with AlY intermediate alloy to remove the oxide layer and impurities of the metal elements and ultrasonically cleaned in ethanol or acetone. Li elements are kept in the glove box for a long time. When using, the surface oxide scale is removed with a blade in the glove box, and then the sample without oxide scale is cut out. After the materials are prepared in the glove box, wait for melting.

[0083] (2) Weighing: Calculate the mass of each element and the AlY master alloy according to the atomic ratio of each component, and use a precision electronic balance to weigh and mix them accurately; for use in smelting the alloy, the Li element is handled in the glove box;

[0084] (3) Alloy melting: The ingot is prepared using a high-vacuum induction melting furnace. Pure metal and AlY master alloy are placed into a crucible in sequence and induction melting is carried out in a high-purity argon atmosphere. After the alloy melts, it is poured into a mold to obtain a cast alloy ingot.

[0085] (4) High-temperature and high-pressure treatment: The obtained alloy ingot was subjected to high-temperature and high-pressure treatment at 14 GPa / 1400 K using a two-stage high-pressure press. First, the alloy sample was assembled in a primary and secondary stage. Then, the pressure was gradually increased to 14 GPa, and then heated to 1400 K, with the pressure and temperature gradually increased until the set value was reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state was maintained for 10 minutes to ensure that the sample underwent the required phase transformation. After the experiment, the temperature was lowered to room temperature, and then the pressure was gradually reduced to atmospheric pressure to avoid drastic changes that could damage the sample or equipment. Finally, the high-temperature and high-pressure sample was taken out for subsequent analysis.

[0086] The obtained as-cast and high-temperature, high-pressure alloy ingots were prepared into samples of certain specifications for testing and characterization.

[0087] The structural and property characterizations of the as-cast and high-temperature, high-pressure alloys prepared by the above methods are as follows:

[0088] (5) Material phase characterization and mechanical property testing:

[0089] The Al obtained above 67 Mg 15 The main phases of the as-cast Li5Zn5Cu5Y3 sample are face-centered cubic solid solution and various intermetallic compound phases. Its maximum compressive strength at room temperature is 472 MPa, and its fracture strain is 14%. The Al obtained above... 67 Mg 15 The Li5Zn5Cu5Y3 high-temperature and high-pressure sample material is mainly composed of face-centered cubic solid solution phase. Its maximum compressive yield strength at room temperature is 865 MPa, and its fracture strain is 26%.

[0090] Summary of Results for Each Implementation Example

[0091] .

[0092] The foregoing has provided a detailed description of a lightweight, high-strength, high-entropy Al alloy bulk material, its preparation method, and its applications, as provided in the embodiments of this application. The descriptions of the embodiments above are merely illustrative of the methods and core concepts of this application; furthermore, those skilled in the art will recognize that, based on the ideas of this application, there may be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0093] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0094] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0095] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0096] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A lightweight, high-strength, high-entropy Al alloy bulk material, characterized in that, The atomic percentage expression for the high-entropy Al alloy bulk material is: Al 70 Mg 15 Li5Zn5Cu5 has a density of 2.7 g / cm³. 3 At room temperature, the compressive strength is 770 MPa and the compressive plasticity is 31%. The lightweight, high-strength, and high-entropy Al alloy bulk material has a face-centered cubic solid solution structure composed of multiple principal metallic elements. The high-temperature and high-pressure treatment process is as follows: using a two-stage large press, the obtained alloy ingot is subjected to high-temperature and high-pressure treatment at 10 GPa / 1000 K. First, the alloy sample is assembled in a primary and secondary stage. Then, the pressure is gradually increased to 10 GPa, and then heated to 1000 K. The pressure and temperature are gradually increased until the set value is reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state is maintained for 5 minutes to ensure that the sample undergoes the required phase transformation.

2. A lightweight, high-strength, high-entropy Al alloy bulk material, characterized in that, The atomic percentage expression for the high-entropy Al alloy bulk material is: Al 70 Mg 17 Li5Zn5Y3 has a maximum compressive yield strength of 813 MPa and a fracture strain of 33% at room temperature; the lightweight, high-strength, and high-entropy Al alloy bulk material has a face-centered cubic solid solution structure composed of multiple principal metallic elements; high-temperature and high-pressure treatment: using a two-stage large press, the obtained alloy ingot is subjected to high-temperature and high-pressure treatment at 12 GPa / 1200 K. First, the alloy sample is assembled in a primary and secondary stage. Then, the pressure is gradually increased to 12 GPa, and then heated to 1200 K. The pressure and temperature are gradually increased until the set value is reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state is maintained for 8 minutes to ensure that the sample undergoes the required phase transformation.

3. A lightweight, high-strength, high-entropy Al alloy bulk material, characterized in that, The atomic percentage expression for the high-entropy Al alloy bulk material is: Al 67 Mg 15 The Li5Zn5Cu5Y3 alloy exhibits a maximum compressive yield strength of 865 MPa and a fracture strain of 26% at room temperature. Furthermore, the lightweight, high-strength, and high-entropy Al alloy bulk material possesses a face-centered cubic solid solution structure composed of multiple principal metallic elements. High-temperature and high-pressure treatment: The obtained alloy ingot is subjected to a high-temperature and high-pressure treatment at 14 GPa / 1400 K using a two-stage high-pressure press. First, the alloy sample undergoes primary and secondary assembly. Then, the pressure is gradually increased to 14 GPa, followed by heating to 1400 K, with gradual pressure and heating continued until the set values ​​are reached. After reaching the set pressure and temperature, the high-temperature and high-pressure state is maintained for 10 minutes to ensure the sample undergoes the required phase transformation.

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