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

Abstract

The application belongs to the technical field of aluminum alloy, and particularly relates to a preparation method of wear-resistant and oxidation-resistant lithium-aluminum alloy. The preparation method comprises the following steps: (1) weighing components of lithium-aluminum alloy; (2) melting and casting, and forging; (3) homogenization treatment; (4) hot rolling: the cast ingot after the homogenization treatment is subjected to hot rolling to obtain a plate; (5) first solid solution treatment: the plate after the hot rolling is subjected to first solid solution treatment and water quenching; (6) isothermal rolling: the plate after the first solid solution treatment is subjected to isothermal rolling; (7) second solid solution treatment: the plate after the isothermal rolling is subjected to second solid solution treatment, and then air cooling to room temperature; (8) aging treatment: the plate after the second solid solution treatment is subjected to aging treatment, and then air cooling to room temperature to obtain the wear-resistant and oxidation-resistant lithium-aluminum alloy. The product prepared by the preparation method has excellent comprehensive performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aluminum alloy, and particularly relates to a preparation method of a wear-resistant and oxidation-resistant lithium-aluminum alloy. BACKGROUND

[0002] Aluminum-lithium alloy has a greater improvement in fatigue and corrosion performance compared with traditional aluminum alloy. The aluminum-lithium alloy is a high-performance lightweight material, which achieves an excellent balance between fatigue performance, damage resistance and mechanical strength, and is widely used in the field of digital products. The aluminum-lithium alloy is based on aluminum as a matrix, by adding lithium as the main alloying element, and possibly supplemented by other elements to optimize performance. The addition of lithium significantly reduces the alloy density while increasing the elastic modulus, thereby achieving better stiffness and anti-deformation capability.

[0003] Aluminum-lithium alloy has become an ideal material for preparing precise components of digital products due to its low density, high specific strength and excellent mechanical properties. However, with the increasing trend of functional integration and miniaturization of digital products, higher requirements are placed on the wear resistance, oxidation resistance and mechanical properties of aluminum-lithium alloy. Wear resistance is a key factor to ensure the long-term stable operation of precise components. Precise components in digital products, such as housings, connecting parts or shaft parts, often need to withstand frequent mechanical contact or friction. If the material surface lacks sufficient wear resistance, it may cause dimensional accuracy to decrease or function to fail due to slight wear, thereby affecting the service life of the product and user experience. Oxidation resistance is crucial to ensure the reliability of components in complex environments. Digital products may be used in high-temperature, humid or dusty environments, which can accelerate the oxidation or corrosion of the material surface, leading to performance degradation or even structural damage. The dense oxide film formed on the surface of aluminum-lithium alloy has a certain protective effect, but 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 lightweight and high-strength demands of modern digital products. The mechanical properties of traditional aluminum-lithium alloy have been difficult to fully meet the demands.

[0004] Chinese patent CN115418534B discloses a 8090 aluminum-lithium alloy fine-grained plate and a preparation method thereof, but the applicant finds that the wear resistance, oxidation resistance and mechanical properties of the plate prepared by the method cannot meet the current market demand.

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

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

[0007] In order to achieve the above-mentioned purpose, the present application 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) The lithium-aluminum alloy raw material is weighed, and the mass percentage is as follows: 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 is Al and inevitable impurity elements;

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

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

[0012] (2) Melting and casting and forging: the lithium-aluminum alloy raw material is vacuum melted and cast to obtain an ingot, and then forged;

[0013] (3) Homogenization treatment: the forged ingot is homogenized and then air-cooled (to room temperature);

[0014] (4) Hot rolling: the air-cooled ingot is hot rolled to obtain a plate;

[0015] (5) Primary solid solution treatment: the plate is subjected to primary solid solution treatment and water-quenched;

[0016] (6) Isothermal rolling: the water-quenched plate is isothermally rolled;

[0017] (7) Secondary solid solution treatment: the isothermally rolled plate is subjected to secondary solid solution treatment and then air-cooled (to room temperature);

[0018] (8) Aging treatment: the plate after step (7) is subjected to aging treatment and then air-cooled (to room temperature) to obtain the wear-resistant and oxidation-resistant lithium-aluminum alloy.

[0019] The application can improve the mechanical properties of the lithium-aluminum alloy 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 is (2-2.5):3. 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. Under this condition, the addition amount of Li is moderate, which can fully play the weight reduction and strengthening effect, and 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 component design under this ratio realizes the best 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 component design under this ratio realizes the best balance among Cu, Mn and Zn, so that the lithium-aluminum alloy has higher wear resistance while maintaining good comprehensive performance.

[0020] Further, the vacuum melting process in the step (2) is as follows: the components of the lithium-aluminum alloy are vacuumed to below 10 Pa, then 1500-2000 Pa of argon is filled, and then refined at 850-860 ℃ for 20-30 min, and then casted to obtain the ingot.

[0021] Further, the forging process in the step (2) is as follows: the ingot is heated to 420-430 ℃, and then heat preserved for 12-15 h, and then forged for 25-30 min, and then the upsetting and drawing deformation is 35-40% during forging, and then air cooled to room temperature after forging.

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

[0023] A, first-stage homogenization treatment: the aluminum-lithium alloy ingot after forging is heated to 420-430 ℃ at room temperature, and then heat preserved for 7-9 h;

[0024] B, second-stage homogenization treatment: after the first-stage homogenization treatment is completed, heated to 450-460 ℃, and then heat preserved for 10-12 h;

[0025] C, third-stage homogenization treatment: after the second-stage homogenization treatment is completed, heated to 470-480 ℃, and then heat preserved for 13-15 h;

[0026] D, four-stage homogenization treatment: after the third-stage homogenization treatment is completed, heated to 500-510 ℃, and then heat preserved for 18-20 h, and then air cooled to room temperature after the four-stage homogenization treatment.

[0027] The four-stage homogenization treatment can improve the oxidation resistance of the lithium-aluminum alloy.

[0028] Further, the hot rolling in step (4) is carried out at a temperature of 400-420 DEG C for 10-12 hours, and then hot rolling is carried out for 15-20 minutes.

[0029] Further, the single-pass deformation amount of the hot rolling in step (4) is controlled to be 17-20%, and the total deformation amount is controlled to be 75-80%, so that a plate with a size of 50*600*3000mm is obtained.

[0030] Further, the temperature of the first solution treatment in step (5) is 510-520 DEG C, and the holding time is 2-3 hours.

[0031] Further, the temperature of the isothermal rolling in step (6) is 180-200 DEG C, and the holding time is 9-10 hours, and then rolling is carried out for 20-30 minutes.

[0032] Further, the single-pass deformation amount of the isothermal rolling in step (6) is controlled to be 12-15%, and the total deformation amount is controlled to be 70-75%, so that a plate with a size of 30*600*5000mm is obtained.

[0033] Further, the temperature of the second solution treatment in step (7) is 520-530 DEG C, and the holding time is 2-3 hours.

[0034] Further, the temperature of the aging treatment in step (8) is 160-170 DEG C, and the holding time is 35-40 hours.

[0035] Compared with the prior art, the application has the following advantages and beneficial effects:

[0036] 1. By selecting the components of the lithium-aluminum alloy, and when the mass percentage of Li:(sum of 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 mass percentages of Mn and Zn, the wear resistance of the lithium-aluminum alloy can be further improved.

[0037] 2. By using four-stage homogenization treatment, the oxidation resistance of the lithium-aluminum alloy can be improved. By controlling the temperature and time of the four-stage homogenization treatment, the element distribution in the alloy is more uniform, microsegregation is reduced, and the microstructure is optimized. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0039] Example 1

[0040] The embodiment provides a preparation method of a wear-resistant and oxidation-resistant lithium-aluminum alloy, and comprises the following steps:

[0041] (1) components of the lithium-aluminum alloy are weighed, and the components of the lithium-aluminum alloy and the mass percentage of each component are as follows: 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 is Al and inevitable impurity elements;

[0042] (2) melting and 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 subjected to forging; the vacuum melting and casting process is as follows: the components of the lithium-aluminum alloy are vacuumized to 5 Pa, then 2000 Pa of argon is filled, then refined at 855 ℃ for 25 min, and then subjected to static casting to obtain the ingot. The forging process is as follows: the ingot is heated to 425 ℃, and then subjected to heat preservation for 13 h, forging for 30 min, and air cooling to room temperature after forging.

[0043] (3) homogenization treatment: the ingot after the forging is subjected to homogenization treatment, and then air cooled to room temperature after the homogenization treatment;

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

[0045] A, first-stage homogenization treatment: the ingot after the forging is heated to 425 ℃ under room temperature conditions, and then subjected to heat preservation for 8 h;

[0046] B, second-stage homogenization treatment: after the first-stage homogenization treatment is completed, the temperature is increased to 455 ℃, and then subjected to heat preservation for 11 h;

[0047] C, third-stage homogenization treatment: after the second-stage homogenization treatment is completed, the temperature is increased to 475 ℃, and then subjected to heat preservation for 14 h;

[0048] D, fourth-stage homogenization treatment: after the third-stage homogenization treatment is completed, the temperature is increased to 505 ℃, and then subjected to heat preservation for 19 h, and then air cooled to room temperature after the fourth-stage homogenization treatment.

[0049] (4) hot rolling: the ingot after the homogenization treatment is subjected to hot rolling to obtain a plate; the hot rolling condition is as follows: the temperature is 410 ℃, heat preservation is performed for 11 h, and then hot rolling is performed, and the hot rolling time is 20 min. The single-pass deformation amount of the hot rolling is controlled to be 18%, and the total deformation amount is controlled to be 78%, and a plate with a size of 50*600*3000 mm is obtained.

[0050] (5) first solid solution treatment: the plate after the hot rolling is subjected to first solid solution treatment, and then subjected to water quenching; the first solid solution treatment temperature is 515 ℃, and the heat preservation time is 2.5 h.

[0051] (6) isothermal rolling: the plate after the first solution treatment is subjected to isothermal rolling; the temperature of the isothermal rolling is 190℃, the holding time is 9.5h, and then rolling is performed, and the rolling time is 25min. The single pass deformation of the isothermal rolling is controlled at 13%, and the total deformation is controlled at 75%, and a plate with a size of 30×600×5000mm is obtained.

[0052] (7) second solution treatment: the plate after the isothermal rolling is subjected to the second solution treatment, and then air cooling is performed to room temperature; the temperature of the second solution treatment is 525℃, and the holding time is 2.5h.

[0053] (8) aging treatment: the plate after the second solution treatment is subjected to the aging treatment, and the temperature of the aging treatment is 165℃, and the holding time is 38h; and then air cooling is performed to room temperature, and the wear-resistant and oxidation-resistant lithium-aluminum alloy is obtained.

[0054] Example 2

[0055] The embodiment provides a preparation method of a wear-resistant and oxidation-resistant lithium-aluminum alloy, and the method comprises the following steps:

[0056] (1) components of the lithium-aluminum alloy are weighed, and the components of the lithium-aluminum alloy and the mass percentage thereof are as follows: 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 is Al and inevitable impurity elements;

[0057] (2) melting and 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 subjected to forging; the vacuum melting and casting process is as follows: the components of the lithium-aluminum alloy are vacuumized to 5Pa, then 1500Pa of argon is filled, then refined at 860℃ for 20min, and then the ingot is obtained after being placed and cast. The forging process is as follows: the ingot is heated to 430℃, and held for 12h, and then forged for 30min, and the upsetting and drawing deformation is 35% during forging, and then air cooling is performed to room temperature after forging.

[0058] (3) homogenization treatment: the ingot after the forging is subjected to the homogenization treatment, and then air cooling is performed to room temperature after the homogenization treatment;

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

[0060] A, first-stage homogenization treatment: the ingot of the aluminum-lithium alloy after the forging is heated to 430℃ at room temperature, and held for 7h;

[0061] B, second-stage homogenization treatment: after the first-stage homogenization treatment is completed, heating is performed to 460℃, and held for 10h;

[0062] C, third-stage homogenization treatment: after the second-stage homogenization treatment is completed, heating is performed to 480℃, and held for 13h;

[0063] D, four-stage homogenization treatment: after the end of the third-stage homogenization treatment, the temperature is raised to 510℃, and the temperature is kept for 18h. After the four-stage homogenization treatment, the air cooling is performed to room temperature.

[0064] (4) hot rolling: the cast ingot after the homogenization treatment is subjected to hot rolling to obtain a plate; the hot rolling condition is: temperature 420℃, temperature keeping for 10h, and then hot rolling, the hot rolling time is 15min. The single pass deformation amount of the hot rolling is controlled to be 17%, and the total deformation amount is controlled to be 80%, to obtain a plate with the size of 50*600*3000mm.

[0065] (5) first solution treatment: the plate after the hot rolling is subjected to the first solution treatment, and then water quenching; the first solution treatment temperature is 510℃, and the temperature keeping time is 3h.

[0066] (6) isothermal rolling: the plate after the first solution treatment is subjected to isothermal rolling; the isothermal rolling temperature is 180℃, and the temperature keeping time is 10h, and then rolling, the rolling time is 20min. The single pass deformation amount of the isothermal rolling is controlled to be 15%, and the total deformation amount is controlled to be 70%, to obtain a plate with the size of 30*600*5000mm.

[0067] (7) second solution treatment: the plate after the isothermal rolling is subjected to the second solution treatment, and then air cooling to room temperature; the second solution treatment temperature is 530℃, and the temperature keeping time is 2h.

[0068] (8) aging treatment: the plate after the second solution treatment is subjected to the aging treatment, the aging treatment temperature is 170℃, and the temperature keeping time is 35h; and then air cooling to room temperature, to obtain the wear-resistant and oxidation-resistant lithium-aluminum alloy.

[0069] Comparative Example 1

[0070] The difference between the present comparative example and Example 1 is that the components and 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 is Al and inevitable impurity elements.

[0071] Comparative Example 2

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

[0073] The components and 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 is 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 is Al and unavoidable 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, and the specific steps are: after forging, the aluminum-lithium alloy ingot is heated to 470℃ at room temperature, and kept for 58h, and then air-cooled 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 of Example 1. The difference from Example 1 is that the preparation process of Example 1 in Chinese Patent CN115418534B A kind of 8090 aluminum-lithium alloy fine-grained plate and its preparation method is used for preparation.

[0081] Comparative Example 6

[0082] This comparative example is the product prepared in Example 1 of Chinese Patent CN115418534B A kind of 8090 aluminum-lithium alloy fine-grained plate and its preparation method.

[0083] Performance test

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

[0085] 1. Mechanical properties: The mechanical properties are determined according to GB / T228.1-2021 "Metallic materials tensile test".

[0086] 2. Wear resistance test: MR-H5B ring block wear testing machine is used, the experimental conditions are temperature 200℃, pressure 400N, and rotation speed 700 / min, the friction coefficient is measured, and the lower the friction coefficient, the better the wear resistance.

[0087] 3. Oxidation resistance: the lithium-aluminum alloy sample is placed in a high-temperature furnace at a temperature of 300℃ for 24 hours, and a scanning electron microscope is used to observe the surface oxidation.

[0088] A: Dense oxide film: refers to a layer of continuous, uniform and no obvious pore or defect oxide film formed on the surface of the material, which can effectively prevent oxygen or other corrosive media from further penetrating into the matrix, thereby playing a protective role.

[0089] B: Oxide film is not dense: refers to the microstructure of the oxide film exists more pores or gaps, resulting in the overall continuity and tightness is not enough.

[0090] C: Oxide film has defects: refers to the local rupture, cracks, peeling or other forms of damage in the oxide film, these defects 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] As can be seen from Table 1, the mechanical properties of the lithium-aluminum alloy of Examples 1-2 are greatly improved compared with the prior art, and the wear resistance and oxidation resistance are better.

[0096] In Comparative Example 1, the mass percentages of the components of the lithium-aluminum alloy are changed, and it can be seen that the comprehensive performance of the aluminum alloy is decreased.

[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 decreased.

[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 is decreased.

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

[0100] In Comparative Example 5, the element composition of Example 1 of the present application is prepared by using the preparation process of the prior art, and the comprehensive performance of the product prepared is decreased.

[0101] In Example 6, the mechanical properties of the product prepared by the prior art are lower than those of Example 1, and the wear resistance and oxidation resistance are not good.

[0102] The above is the preferred embodiment of the present application, it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of producing a wear resistant, oxidation resistant lithium aluminum alloy, characterized by, The method comprises the following steps: (1) taking lithium-aluminum alloy raw materials, and according to 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 is Al and inevitable impurity elements; the ratio of the mass percentage of Li to the sum of the mass percentage of Mg and Ce is (2-2.5):3; the mass percentage of Cu is greater than the sum of the mass percentage of Mn and Zn; (2) melting and casting, forging: the lithium-aluminum alloy raw materials are vacuum melted to obtain ingots, and then the ingots are forged; (3) homogenization treatment: the forged ingots are subjected to homogenization treatment, and then air-cooled; (4) hot rolling: the air-cooled ingots are hot rolled to obtain plates; (5) primary solid solution treatment: the plates are subjected to primary solid solution treatment, and then water-quenched; (6) isothermal rolling: the water-quenched plates are subjected to isothermal rolling; (7) secondary solid solution treatment: the isothermally rolled plates are subjected to secondary solid solution treatment, and then air-cooled; (8) aging treatment: the plates subjected to the treatment in step (7) are subjected to aging treatment, and then air-cooled to obtain lithium-aluminum alloy plates with wear resistance and oxidation resistance; The homogenization treatment in step (3) is four-stage homogenization treatment, and the specific steps are as follows: A, first-stage homogenization treatment: under room temperature conditions, the forged lithium-aluminum alloy ingots are heated to 420-430 DEG C and kept for 7-9 h; B, second-stage homogenization treatment: after the first-stage homogenization treatment is completed, the temperature is raised to 450-460 DEG C and kept for 10-12 h; C, third-stage homogenization treatment: after the second-stage homogenization treatment is completed, the temperature is raised to 470-480 DEG C and kept for 13-15 h; D, four-stage homogenization treatment: after the third-stage homogenization treatment is completed, the temperature is raised to 500-510 DEG C and kept for 18-20 h, and then air-cooled to room temperature after the four-stage homogenization treatment.

2. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: The vacuum melting process in step (2) is as follows: the lithium-aluminum alloy components are vacuumed to below 10 Pa, then 1500-2000 Pa of argon is filled, then refined at 850-860 DEG C for 20-30 min, and then cast to obtain ingots; And / or, the forging process in step (2) is as follows: the ingots are heated to 420-430 DEG C and kept for 12-15 h, then forged, the forging time is 25-30 min, the upsetting and drawing deformation amount is 35-40% during forging, and then air-cooled to room temperature after forging.

3. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: The hot rolling condition in step (4) is as follows: the temperature is 400-420 DEG C, kept for 10-12 h, then hot rolled, and the hot rolling time is 15-20 min.

4. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: The single-pass deformation amount of the hot rolling in step (4) is controlled to be 17-20%, and the total deformation amount is controlled to be 75-80%, to obtain plates with a size of 50*600*3000 mm.

5. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: The temperature of the primary solid solution treatment in step (5) is 510-520 DEG C, and the keeping time is 2-3 h.

6. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: The isothermal rolling temperature in step (6) is 180-200 DEG C, and the keeping time is 9-10 h, then rolled, and the rolling time is 20-30 min.

7. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: providing a lithium source; providing an aluminum source; and combining the lithium source and the aluminum source to form the wear resistant, oxidation resistant lithium aluminum alloy. In the step (6), the single pass deformation of the isothermal rolling is controlled in 12-15%, and the total deformation is controlled in 70-75%, to obtain a plate with the size of 30*600*5000mm.

8. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: providing a lithium source; providing an aluminum source; and combining the lithium source and the aluminum source to form the wear resistant, oxidation resistant lithium aluminum alloy. In the step (7), the temperature of the secondary solid solution treatment is 520-530℃, and the holding time is 2-3h.

9. The method of claim 1, wherein the wear resistant, oxidation resistant lithium aluminum alloy is prepared by the steps of: providing a lithium source; providing an aluminum source; and combining the lithium source and the aluminum source to form the wear resistant, oxidation resistant lithium aluminum alloy. In the step (8), the temperature of the aging treatment is 160-170℃, and the holding time is 35-40h.

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