Preparation method of wear-resistant anti-oxidation lithium-aluminum alloy

Abstract

The invention belongs to the technical field of aluminum alloys, and particularly relates to a preparation method of a wear-resistant anti-oxidation lithium aluminum alloy. The preparation method comprises the following steps: (1) weighing components of the lithium-aluminum alloy; (2) casting and forging; (3) homogenization treatment; (4) hot rolling: carrying out hot rolling on the homogenized cast ingot to obtain a plate; (5) primary solution treatment: carrying out primary solution treatment on the hot-rolled plate, and carrying out water-cooling quenching; (6) isothermal rolling: carrying out isothermal rolling on the plate subjected to primary solution treatment; (7) secondary solution treatment: carrying out secondary solution treatment on the plate subjected to isothermal rolling, and then air-cooling to room temperature; and (8) aging treatment is conducted, specifically, aging treatment is conducted on the plate obtained after secondary solution treatment, then air cooling is conducted to the room temperature, and the wear-resisting and oxidation-resisting lithium aluminum alloy is obtained. The product prepared by the preparation method is excellent in comprehensive performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloys, and particularly relates to a preparation method of a wear-resistant and oxidation-resistant lithium aluminum alloy. Background Art

[0002] Aluminum-lithium alloys have significantly improved fatigue and corrosion resistance compared to traditional aluminum alloys. Lithium aluminum alloys are high-performance lightweight materials that achieve an excellent balance among fatigue performance, damage tolerance, and mechanical strength, and are widely used in the field of digital products. Aluminum-lithium alloys are based on aluminum, with lithium added as the main alloying element, and may be supplemented with other elements to optimize performance. The addition of lithium significantly reduces the alloy density while increasing the elastic modulus, thus achieving better stiffness and resistance to deformation.

[0003] Due to their low density, high specific strength, and excellent mechanical properties, aluminum-lithium alloys have become ideal materials for fabricating precision components of digital products. However, with the continuous trend of increasing functional integration and miniaturization of digital products, higher requirements are imposed on the wear resistance, oxidation resistance, and mechanical properties of aluminum-lithium alloys. Wear resistance is a key factor to ensure the long-term stable operation of precision components. Precision components in digital products (such as housings, connectors, or rotating shaft components) usually need to withstand frequent mechanical contact or friction. If the material surface lacks sufficient wear resistance, it may lead to a decrease in dimensional accuracy or functional failure due to minor wear, thereby affecting the service life of the product and the user experience. Oxidation resistance is crucial for ensuring the reliability of components in complex environments. Digital products may be used in high-temperature, humid, or dusty environments, which will accelerate the surface oxidation or corrosion of materials, resulting in performance degradation or even structural damage. The dense oxide film formed on the surface of aluminum-lithium alloys has a certain protective effect. However, if the oxide film is not dense or has defects, it cannot completely prevent further oxidation. The improvement of mechanical properties is the core to meet the requirements of lightweight and high strength of modern digital products, and the mechanical properties of traditional aluminum-lithium alloys are difficult to fully meet the needs.

[0004] Chinese Patent CN115418534B discloses an 8090 aluminum-lithium alloy fine-grained sheet and its preparation method. However, the applicant found that when using the sheets prepared by this method, the wear resistance, oxidation resistance, and mechanical properties cannot meet the current market requirements.

[0005] Therefore, there is an urgent need for a preparation method of a wear-resistant and oxidation-resistant lithium aluminum alloy. Summary of the Invention

[0006] The object of the present invention is to provide a preparation method of a wear-resistant and oxidation-resistant lithium aluminum alloy.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A preparation method of a wear-resistant and oxidation-resistant lithium-aluminum alloy, comprising the following steps:

[0009] (1) Weigh the aluminum-lithium alloy raw materials, and according to the mass percentage: Li 1.7 - 2.9%, Mg 1.7 - 2.3%, Cu 0.3 - 0.5%, Zr 0.06 - 0.12%, Mn 0.17 - 0.22%, Ti 0.05 - 0.10%, Zn 0.13 - 0.27%, Ce 0.7 - 1.3%, and the rest are Al and inevitable impurity elements;

[0010] The ratio of the mass percentage of Li to the sum of the mass percentages of Mg and Ce is (2 - 2.5):3;

[0011] The mass percentage of Cu is greater than the sum of the mass percentages of Mn and Zn;

[0012] (2) Melting and forging: Vacuum melt the aluminum-lithium alloy raw materials to obtain an ingot, and then forge it;

[0013] (3) Homogenization treatment: Homogenize the forged ingot, and then air-cool (to room temperature);

[0014] (4) Hot rolling: Hot roll the air-cooled ingot to obtain a sheet;

[0015] (5) Primary solution treatment: Perform primary solution treatment on the sheet, and water-quench;

[0016] (6) Isothermal rolling: Isothermally roll the water-quenched sheet;

[0017] (7) Secondary solution treatment: Perform secondary solution treatment on the isothermally rolled sheet, and then air-cool (to room temperature);

[0018] (8) Aging treatment: Perform aging treatment on the sheet treated in step (7), and then air-cool (to room temperature) to obtain a wear-resistant and oxidation-resistant lithium-aluminum alloy.

[0019] By selecting the components of the lithium-aluminum alloy, and the ratio of the mass percentage of Li to the sum of the mass percentages of Mg and Ce being (2 - 2.5):3, the mechanical properties of the lithium-aluminum alloy can be improved. When the mass percentage of Cu is greater than the sum of the mass percentages of Mn and Zn, the wear resistance of the lithium-aluminum alloy can be further improved. The analysis is that under these conditions, the addition amount of Li is appropriate, which can give full play to its weight reduction and strengthening effects. Under the synergistic effect of Mg and Ce, the strength and toughness of the alloy can be further improved by forming fine and dispersed strengthening phases. The composition design under this ratio realizes the optimal balance among Li, Mg, and Ce. When the mass percentage of Cu is greater than the sum of the mass percentages of Mn and Zn, the composition design under this ratio realizes the optimal balance among Cu, Mn, and Zn, enabling the lithium-aluminum alloy to have higher wear resistance while maintaining good comprehensive properties.

[0020] Further, the vacuum melting and casting process in step (2) is as follows: evacuate the components of the lithium-aluminum alloy to below 10 Pa, then fill with argon at 1500 - 2000 Pa, and then heat up to 850 - 860 °C for refining for 20 - 30 min, let it stand, and cast to obtain an ingot.

[0021] Further, the forging process in step (2) is as follows: heat the ingot to 420 - 430 °C, keep it warm for 12 - 15 h, forge, the forging time is 25 - 30 min, the upsetting and drawing deformation amount during forging is 35 - 40%, and air-cool to room temperature after forging.

[0022] Further, the homogenization treatment in step (3) is a four-stage homogenization treatment, and the specific steps are as follows:

[0023] A. First-stage homogenization treatment: At room temperature, heat the forged aluminum-lithium alloy ingot to 420 - 430 °C and keep it warm for 7 - 9 h;

[0024] B. Second-stage homogenization treatment: After the first-stage homogenization treatment is completed, heat up to 450 - 460 °C and keep it warm for 10 - 12 h;

[0025] C. Third-stage homogenization treatment: After the second-stage homogenization treatment is completed, heat up to 470 - 480 °C and keep it warm for 13 - 15 h;

[0026] D. Fourth-stage homogenization treatment: After the third-stage homogenization treatment is completed, heat up to 500 - 510 °C and keep it warm for 18 - 20 h, and air-cool to room temperature after the four-stage homogenization treatment.

[0027] The present invention uses a four-stage homogenization treatment to improve the oxidation resistance of the lithium-aluminum alloy. By controlling the temperature and time through the four-stage homogenization treatment, the distribution of elements in the alloy becomes more uniform, reducing micro-segregation and optimizing the microstructure.

[0028] Further, the conditions for hot rolling in step (4) are as follows: temperature is 400 - 420°C, heat preservation is for 10 - 12 h, followed by hot rolling, and the hot rolling time is 15 - 20 min.

[0029] Further, in step (4), the single - pass deformation amount of hot rolling is controlled within 17 - 20%, and the total deformation amount is controlled within 75 - 80% to obtain a plate with dimensions of 50×600×3000 mm.

[0030] Further, in step (5), the temperature for the first solution treatment is 510 - 520°C, and the heat preservation time is 2 - 3 h.

[0031] Further, in step (6), the temperature for isothermal rolling is 180 - 200°C, heat preservation is for 9 - 10 h, followed by rolling, and the rolling time is 20 - 30 min.

[0032] Further, in step (6), the single - pass deformation amount of isothermal rolling is controlled within 12 - 15%, and the total deformation amount is controlled within 70 - 75% to obtain a plate with dimensions of 30×600×5000 mm.

[0033] Further, in step (7), the temperature for the second solution treatment is 520 - 530°C, and the heat preservation time is 2 - 3 h.

[0034] Further, in step (8), the temperature for aging treatment is 160 - 170°C, and the heat preservation time is 35 - 40 h.

[0035] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0036] 1. By selecting the components of the lithium - aluminum alloy in the present invention, when the ratio of the mass percentage of Li to the sum of the mass percentages of Mg and Ce is (2 - 2.5):3, the mechanical properties of the lithium - aluminum alloy can be improved. When the mass percentage of Cu is greater than the sum of the mass percentages of Mn and Zn, the wear resistance of the lithium - aluminum alloy can be further improved.

[0037] 2. The present invention uses four - stage homogenization treatment to improve the oxidation resistance of the lithium - aluminum alloy. By controlling the temperature and time in the four - stage homogenization treatment, the distribution of elements in the alloy becomes more uniform, reducing micro - segregation and optimizing the microstructure. Specific Embodiments

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Example 1

[0040] This embodiment provides a method for preparing a wear-resistant and oxidation-resistant lithium-aluminum alloy, comprising the following steps:

[0041] (1) Weigh the components of the lithium-aluminum alloy. The components of the aluminum-lithium alloy and their mass percentages are: Li 2.2%, Mg 1.9%, Cu 0.4%, Zr 0.08%, Mn 0.17%, Ti 0.08%, Zn 0.15%, Ce 1.1%, and the rest are Al and inevitable impurity elements;

[0042] (2) Melting, casting, and forging: Vacuum melt-cast the components of the lithium-aluminum alloy to obtain an ingot, and then forge the ingot. The vacuum melt-casting process is as follows: Evacuate the components of the lithium-aluminum alloy to 5 Pa, then fill with argon at 2000 Pa, and then raise the temperature to 855 °C for refining for 25 min, stand still, and cast to obtain an ingot. The forging process is as follows: Raise the temperature of the ingot to 425 °C, hold for 13 h, forge, the forging time is 30 min, the upsetting-drawing deformation amount during forging is 38%, and after forging, air-cool to room temperature.

[0043] (3) Homogenization treatment: Perform homogenization treatment on the forged ingot, and after homogenization treatment, air-cool to room temperature;

[0044] The homogenization treatment is a four-stage homogenization treatment, and the specific steps are as follows:

[0045] A. First-stage homogenization treatment: At room temperature, raise the temperature of the forged aluminum-lithium alloy ingot to 425 °C and hold for 8 h;

[0046] B. Second-stage homogenization treatment: After the first-stage homogenization treatment is completed, raise the temperature to 455 °C and hold for 11 h;

[0047] C. Third-stage homogenization treatment: After the second-stage homogenization treatment is completed, raise the temperature to 475 °C and hold for 14 h;

[0048] D. Fourth-stage homogenization treatment: After the third-stage homogenization treatment is completed, raise the temperature to 505 °C and hold for 19 h. After the four-stage homogenization treatment, air-cool to room temperature.

[0049] (4) Hot rolling: Hot roll the ingot after homogenization treatment to obtain a sheet. The conditions for hot rolling are: temperature 410 °C, hold for 11 h, and then hot roll. The hot rolling time is 20 min. The single-pass deformation amount during hot rolling is controlled at 18%, and the total deformation amount is controlled at 78% to obtain a sheet with dimensions of 50×600×3000 mm.

[0050] (5) First solution treatment: Perform first solution treatment on the sheet after hot rolling and water-quench. The temperature for the first solution treatment is 515 °C and hold for 2.5 h.

[0051] (6) Isothermal rolling: The plate after the first solution treatment is subjected to isothermal rolling; the temperature of isothermal rolling is 190 °C, hold for 9.5 h, and then roll, the rolling time is 25 min. The single-pass deformation of isothermal rolling is controlled at 13%, and the total deformation is controlled at 75% to obtain a plate with dimensions of 30×600×5000 mm.

[0052] (7) Second solution treatment: The plate after isothermal rolling is subjected to a second solution treatment and then air-cooled to room temperature; the temperature of the second solution treatment is 525 °C, hold for 2.5 h.

[0053] (8) Aging treatment: The plate after the second solution treatment is subjected to aging treatment, the temperature of aging treatment is 165 °C, hold for 38 h; then air-cooled to room temperature to obtain a wear-resistant and oxidation-resistant lithium aluminum alloy.

[0054] Example 2

[0055] This example provides a method for preparing a wear-resistant and oxidation-resistant lithium aluminum alloy, including the following steps:

[0056] (1) Weigh the components of the lithium aluminum alloy. The components of the aluminum-lithium alloy and their mass percentages are: Li 2.5%, Mg 2.2%, Cu 0.5%, Zr 0.06%, Mn 0.22%, Ti 0.05%, Zn 0.13%, Ce 0.8%, and the rest are Al and inevitable impurity elements;

[0057] (2) Melting, casting and forging: The components of the lithium aluminum alloy are subjected to vacuum melting and casting to obtain an ingot, and the ingot is forged; the vacuum melting and casting process is: evacuate the lithium aluminum alloy components to 5 Pa, then fill with argon at 1500 Pa, and then heat up to 860 °C for refining for 20 min, stand still, and cast to obtain an ingot. The forging process is: heat the ingot to 430 °C, hold for 12 h, forge, the forging time is 30 min, the upsetting and drawing deformation during forging is 35%, and air-cool to room temperature after forging.

[0058] (3) Homogenization treatment: The forged ingot is subjected to homogenization treatment and then air-cooled to room temperature;

[0059] The homogenization treatment is a four-stage homogenization treatment, and the specific steps are:

[0060] A. First-stage homogenization treatment: At room temperature, heat the forged aluminum-lithium alloy ingot to 430 °C and hold for 7 h;

[0061] B. Second-stage homogenization treatment: After the first-stage homogenization treatment, heat up to 460 °C and hold for 10 h;

[0062] C. Third-stage homogenization treatment: After the second-stage homogenization treatment, heat up to 480 °C and hold for 13 h;

[0063] D, Quaternary homogenization treatment: After the tertiary homogenization treatment is completed, the temperature is raised to 510 °C and held for 18 h. After the quaternary homogenization treatment, it is air-cooled to room temperature.

[0064] (4) Hot rolling: The homogenized ingot is hot-rolled to obtain a sheet; the conditions for hot rolling are: temperature 420 °C, holding for 10 h, and then hot rolling, with the hot rolling time being 15 min. The single-pass deformation of hot rolling is controlled at 17%, and the total deformation is controlled at 80%, obtaining a sheet with dimensions of 50×600×3000 mm.

[0065] (5) Primary solution treatment: The hot-rolled sheet is subjected to primary solution treatment and water-cooled quenching; the temperature of the primary solution treatment is 510 °C and held for 3 h.

[0066] (6) Isothermal rolling: The sheet after primary solution treatment is isothermally rolled; the temperature of isothermal rolling is 180 °C, held for 10 h, and then rolled, with the rolling time being 20 min. The single-pass deformation of isothermal rolling is controlled at 15%, and the total deformation is controlled at 70%, obtaining a sheet with dimensions of 30×600×5000 mm.

[0067] (7) Secondary solution treatment: The sheet after isothermal rolling is subjected to secondary solution treatment and then air-cooled to room temperature; the temperature of the secondary solution treatment is 530 °C and held for 2 h.

[0068] (8) Aging treatment: The sheet after secondary solution treatment is subjected to aging treatment, with the aging treatment temperature being 170 °C and held for 35 h; then it is air-cooled to room temperature to obtain a wear-resistant and oxidation-resistant lithium-aluminum alloy.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that the components and their mass percentages of the aluminum-lithium alloy are: Li 1.5%, Mg 1.3%, Cu 0.7%, Zr 0.15%, Mn 0.25%, Ti 0.14%, Zn 0.06%, Ce 0.42%, and the rest are Al and inevitable impurity elements;

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the addition amounts of Li, Mg, and Ce are different.

[0073] The components and their mass percentages of the aluminum-lithium alloy are: Li 1.2%, Mg 2.5%, Cu 0.4%, Zr 0.08%, Mn 0.17%, Ti 0.08%, Zn 0.15%, Ce 1.8%, and the rest are Al and inevitable impurity elements.

[0074] Comparative Example 3

[0075] The difference between this comparative example and Example 1 is that the addition amounts of Cu, Mn, and Zn are different.

[0076] The components and their mass percentages of the aluminum-lithium alloy are: Li 2.2%, Mg 1.9%, Cu 0.20%, Zr 0.08%, Mn 0.29%, Ti 0.08%, Zn 0.02%, Ce 1.1%, and the rest are Al and inevitable impurity elements;

[0077] Comparative Example 4

[0078] The difference between this comparative example and Example 1 is that the homogenization treatment is a conventional method. The specific steps are: at room temperature, heat the forged aluminum-lithium alloy ingot to 470 °C, hold for 58 h, and air-cool to room temperature.

[0079] Comparative Example 5

[0080] The difference between this comparative example and Example 1 is that the composition of the lithium-aluminum alloy in this comparative example is the same as that in Example 1. Different from Example 1: The preparation process of Example 1 in Chinese Patent CN115418534B, a method for preparing a fine-grained sheet of 8090 aluminum-lithium alloy, is used for preparation.

[0081] Comparative Example 6

[0082] This comparative example is the product prepared in Example 1 of Chinese Patent CN115418534B, a method for preparing a fine-grained sheet of 8090 aluminum-lithium alloy.

[0083] Performance Test

[0084] The products prepared in Examples 1-2 and Comparative Examples 1-6 were subjected to performance tests.

[0085] 1. Mechanical properties: Refer to GB / T228.1-2021 "Tensile Testing of Metallic Materials" to determine the mechanical properties.

[0086] 2. Wear resistance test: Use an MR-H5B ring-block wear testing machine. The experimental conditions are a temperature of 200 °C, a pressure of 400 N, and a rotation speed of 700 / min. Measure the friction coefficient. The lower the friction coefficient, the better the wear resistance.

[0087] 3. Oxidation resistance: Place the lithium-aluminum alloy specimen in a high-temperature furnace and place it at a temperature of 300 °C for 24 hours. Use a scanning electron microscope to observe the surface oxidation condition.

[0088] A: Dense oxide film: It refers to a continuous, uniform, and oxide film without obvious pores or defects formed on the material surface, which can effectively prevent oxygen or other corrosive media from further penetrating into the matrix, thus playing a protective role.

[0089] B: The oxide film is not dense: it means that there are many pores or gaps in the microstructure of the oxide film, resulting in insufficient overall continuity and compactness.

[0090] C: Defects in the oxide film: This refers to local ruptures, cracks, peeling or other forms of damage in the oxide film, which destroy the overall integrity of the oxide film.

[0091] The results are shown in Table 1.

[0092] Table 1 Performance test results

[0093]

[0094]

[0095] It can be seen from Table 1 that the mechanical properties of the lithium aluminum alloy of Example 1-2 are greatly improved compared with the prior art, and the wear resistance and oxidation resistance are also better.

[0096] In Comparative Example 1, the mass percentages of the components of the lithium aluminum alloy were changed, and it can be seen that the comprehensive properties of the aluminum alloy were reduced.

[0097] In Comparative Example 2, the mass percentages of Li, Mg and Ce are different, and it can be found that the mechanical properties of the lithium aluminum alloy are reduced.

[0098] In Comparative Example 3, the mass percentages of Cu, Mn and Zn are different, and it can be found that the wear resistance of the lithium aluminum alloy decreases.

[0099] In Comparative Example 4, the four-stage homogenization treatment was not used, and the oxidation resistance of the lithium aluminum alloy decreased.

[0100] In Comparative Example 5, the elemental composition of Example 1 of the present invention is prepared using the prior art preparation process, and the comprehensive performance of the product prepared is reduced.

[0101] The mechanical properties of the product prepared by the prior art in Example 6 are lower than those in Example 1, and the wear resistance and oxidation resistance are poor.

[0102] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A preparation method of a wear-resistant and oxidation-resistant lithium-aluminum alloy, characterized in that, It includes the following steps: (1) Weigh the aluminum-lithium alloy raw materials. According to the mass percentage: Li is 1.7 - 2.9%, Mg is 1.7 - 2.3%, Cu is 0.3 - 0.5%, Zr is 0.06 - 0.12%, Mn is 0.17 - 0.22%, Ti is 0.05 - 0.10%, Zn is 0.13 - 0.27%, Ce is 0.7 - 1.3%, and the rest is Al and inevitable impurity elements; the ratio of the mass percentage of Li to the sum of the mass percentages of Mg and Ce is (2 - 2.5):3; the mass percentage of Cu is greater than the sum of the mass percentages of Mn and Zn; (2) Melting and forging: Vacuum melt the aluminum-lithium alloy raw materials to obtain an ingot, and then forge it; (3) Homogenization treatment: Homogenize the forged ingot and then air-cool it; (4) Hot rolling: Hot roll the air-cooled ingot to obtain a sheet; (5) Primary solution treatment: Perform primary solution treatment on the sheet and water-quench it; (6) Isothermal rolling: Isothermally roll the water-quenched sheet; (7) Secondary solution treatment: Perform secondary solution treatment on the isothermally rolled sheet and then air-cool it; (8) Aging treatment: Perform aging treatment on the sheet treated in step (7) and then air-cool it to obtain a wear-resistant and oxidation-resistant aluminum-lithium alloy.

2. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, wherein The process of vacuum melting in step (2) is as follows: Evacuate the aluminum-lithium alloy components to below 10 Pa, then fill with argon at 1500 - 2000 Pa, and then heat up to 850 - 860 °C for refining for 20 - 30 min, let it stand, and cast to obtain an ingot; And / or, the forging process in step (2) is as follows: Heat the ingot to 420 - 430 °C, keep it warm for 12 - 15 h, forge it, the forging time is 25 - 30 min, the upsetting and drawing deformation amount during forging is 35 - 40%, and after forging, air-cool it to room temperature.

3. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, wherein, The homogenization treatment in step (3) is a four-stage homogenization treatment, and the specific steps are as follows: A. Primary homogenization treatment: At room temperature, heat the forged aluminum-lithium alloy ingot to 420 - 430 °C and keep it warm for 7 - 9 h; B. Secondary homogenization treatment: After the primary homogenization treatment is completed, heat it up to 450 - 460 °C and keep it warm for 10 - 12 h; C. Tertiary homogenization treatment: After the secondary homogenization treatment is completed, heat it up to 470 - 480 °C and keep it warm for 13 - 15 h; D. Quaternary homogenization treatment: After the tertiary homogenization treatment is completed, heat it up to 500 - 510 °C and keep it warm for 18 - 20 h, and after the four-stage homogenization treatment, air-cool it to room temperature.

4. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, wherein, The conditions for hot rolling in step (4) are: temperature 400 - 420 °C, keep it warm for 10 - 12 h, and then hot roll, the hot rolling time is 15 - 20 min.

5. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that, The single-pass deformation amount during hot rolling in step (4) is controlled at 17 - 20%, and the total deformation amount is controlled at 75 - 80% to obtain a sheet with dimensions of 50×600×3000 mm.

6. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that, The temperature for the primary solution treatment in step (5) is 510 - 520 °C and keep it warm for 2 - 3 h.

7. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that The temperature for isothermal rolling in step (6) is 180 - 200 °C, keep it warm for 9 - 10 h, and then roll, the rolling time is 20 - 30 min.

8. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that, In the step (6), the single-pass deformation amount of the isothermal rolling is controlled to be 12-15%, and the total deformation amount is controlled to be 70-75%, so as to obtain a sheet with dimensions of 30×600×5000 mm.

9. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that, In the step (7), the temperature of the secondary solution treatment is 520-530 °C, and the heat preservation time is 2-3 h.

10. The preparation method of the wear-resistant and oxidation-resistant lithium-aluminum alloy according to claim 1, characterized in that, In the step (8), the temperature of the aging treatment is 160-170 °C, and the heat preservation time is 35-40 h.

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