Magnesium-aluminum composite plate and preparation method thereof

Abstract

The present invention relates to the field of composite plate preparation, and more specifically, to a magnesium-aluminum composite plate and its preparation method. The preparation method includes conducting high-temperature tensile tests on magnesium and aluminum plates, respectively, to obtain corresponding mechanical properties and stress-strain curves. Computer software is then used to simulate the rolling deformation of the two plates. Based on the simulation results, an appropriate rolling temperature and rolling rate are selected, and then rolling experiments are conducted. This preparation method can reduce the number of rolling experiments and achieve coordinated deformation during the rolling process of magnesium and aluminum plates of different strengths.

Description

Technical Field

[0001] The present invention relates to the field of composite plate preparation, and in particular to a magnesium-aluminum composite plate and a preparation method thereof. Background Art

[0002] Magnesium / aluminum composite panels combine the advantages of both magnesium and aluminum, offering low density, corrosion resistance, and excellent vibration damping properties. These panels offer superior overall performance compared to either material alone, resulting in broad application prospects in aerospace, automotive, and transportation sectors. They have become a research hotspot in the light metals field both domestically and internationally. Commonly used methods for preparing magnesium / aluminum composite panels include co-extrusion, rolling lamination, diffusion welding, explosive lamination, and friction stir welding. Rolling lamination offers high production efficiency and eases large-scale industrial production, making it the fastest-growing and most widely used method for producing magnesium / aluminum composite panels. Aluminum alloys have a body-centered cubic structure with numerous slip systems and are prone to deformation, while magnesium alloys have a close-packed hexagonal structure with fewer slip systems. Furthermore, the rolling process can easily lead to warping, bending, edge cracking, and internal cracking in composite panels due to differences in strength, ductility, and formability between magnesium and aluminum alloys. Currently, researchers often use a trial-and-error method to adjust rolling parameters, which often results in significant waste of raw magnesium and aluminum sheets and makes it difficult to achieve optimal results. Furthermore, when switching to a different magnesium and aluminum sheet combination, the process parameters must be readjusted.

[0003] Therefore, there is an urgent need to develop a fast preparation method that can achieve coordinated deformation of thin magnesium-aluminum plates. It is best if this preparation method can effectively reduce the experimental process and ensure that the prepared composite plates have excellent performance and are flat. Summary of the Invention

[0004] The present invention provides a magnesium-aluminum composite plate and a preparation method thereof, aiming to provide a preparation method for achieving coordinated deformation of the magnesium-aluminum composite plate, and the method can reduce the number of tests, and the prepared magnesium-aluminum composite plate has excellent flatness performance.

[0005] The present invention is achieved in that:

[0006] In a first aspect, an embodiment of the present invention provides a method for preparing a magnesium-aluminum composite plate, comprising subjecting a magnesium plate and an aluminum plate to high-temperature tensile tests, respectively, to obtain a stress-strain curve of the magnesium plate, mechanical properties of the magnesium plate, and a stress-strain curve of the aluminum plate, and mechanical properties of the aluminum plate;

[0007] According to the stress-strain curve of the aluminum plate, the strain value is selected, and the temperature range of the aluminum plate and the strain rate range of the aluminum plate corresponding to σb(Al) / σb(Mg)=0.8-1.2 are selected;

[0008] According to the stress-strain curve of the magnesium plate, the strain value is selected, and the temperature range and strain rate range of the magnesium plate corresponding to σb(Al) / σb(Mg)=0.8-1.2 are selected; wherein the strain value used for the magnesium plate is the same as the strain value used for the aluminum plate;

[0009] The rolling process is simulated using simulation software, wherein the mechanical properties of the magnesium plate, the temperature range of the magnesium plate, and the strain rate range of the magnesium plate, as well as the mechanical properties of the aluminum plate, the temperature range of the aluminum plate, the strain rate range of the aluminum plate, and the strain amount obtained above are input into the simulation software to obtain the stress and strain field of the magnesium plate and the stress and strain field of the aluminum plate during the rolling process, respectively;

[0010] According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature of the magnesium plate, the rolling temperature of the aluminum plate, the rolling strain rate and the rolling strain amount are determined as rolling parameters;

[0011] Then, the magnesium plate and the aluminum plate are preheated according to the rolling temperature of the magnesium plate and the rolling temperature of the aluminum plate obtained above;

[0012] Next, the preheated aluminum plates and magnesium plates are stacked in the order of aluminum / magnesium / aluminum, and then rolled at the above-mentioned rolling strain rate.

[0013] Furthermore, in a preferred embodiment of the present invention, the method includes: testing the magnesium plate and the aluminum plate at different temperatures and different strain rates, respectively, to obtain the stress-strain curve and mechanical properties of the magnesium plate, the stress-strain curve and mechanical properties of the aluminum plate;

[0014] Including: at 250℃, 300℃, 350℃, 400℃ and 450℃ and 0.01S -1 , 0.1S -1 , 1S -1 , 10S -1 The magnesium plate and the aluminum plate are tested respectively to obtain a stress-strain curve of the magnesium plate and mechanical properties of the magnesium plate, and a stress-strain curve of the aluminum plate and mechanical properties of the aluminum plate.

[0015] Furthermore, in a preferred embodiment of the present invention, the aluminum plate and the magnesium plate are pretreated respectively before preheating;

[0016] Preferably, the pretreatment includes: grinding the surface, removing surface stains, and drilling;

[0017] Preferably, the preheating time is 5-15 minutes.

[0018] Furthermore, in a preferred embodiment of the present invention, the number of stacked layers is ≥2;

[0019] Preferably, the magnesium plate and the aluminum plate are riveted after preheating and before stacking.

[0020] Furthermore, in a preferred embodiment of the present invention, the thickness of the magnesium plate and the aluminum plate are respectively 0.5-8 mm.

[0021] Furthermore, in a preferred embodiment of the present invention, the magnesium plate is selected from any one of a pure metal magnesium plate, a Mg-Zn composite magnesium plate, a Mg-Mn composite magnesium plate, a Mg-RE composite magnesium plate and a Mg-Al composite magnesium plate.

[0022] Furthermore, in a preferred embodiment of the present invention, the aluminum plate is selected from any one of 1 series aluminum alloy plate, 2 series aluminum alloy plate, 3 series aluminum alloy plate, 4 series aluminum alloy plate, 5 series aluminum alloy plate, 6 series aluminum alloy plate and 7 series aluminum alloy plate.

[0023] Furthermore, in a preferred embodiment of the present invention, the aluminum plate and the magnesium plate can be selected from any one of rolled, extruded and cast states.

[0024] Furthermore, in a preferred embodiment of the present invention, the strain of the aluminum plate and the magnesium plate is 35-70%, and the preferred deformation is 40%-60%.

[0025] In a second aspect, an embodiment of the present invention provides a magnesium-aluminum composite plate, which is prepared by the above-mentioned method for preparing a magnesium-aluminum composite plate.

[0026] The beneficial effects of the present invention are: the present invention selects appropriate rolling process parameters through high-temperature tensile tests and rolling simulations, reduces the number of experiments, and can achieve the preparation of coordinated deformation of magnesium-aluminum composite plates, and ensure that the prepared magnesium-aluminum composite plates are flat and have excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a high temperature tensile diagram of AZ31 provided in Example 1 of the present invention;

[0029] Figure 2 This is the 7075 high temperature tensile diagram provided in Example 1 of the present invention;

[0030] Figure 3 This is a rolling simulation schematic diagram provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0032] The following is a detailed description of a magnesium-aluminum composite plate and a preparation method thereof according to an embodiment of the present invention.

[0033] An embodiment of the present invention provides a method for preparing a magnesium-aluminum composite plate, comprising:

[0034] Magnesium plate and aluminum plate raw materials were selected and part of the raw materials were cut for tensile test. Specifically, the magnesium plate and aluminum plate were tested on a high temperature tensile machine at different temperatures (250℃, 300℃, 350℃, 400℃ and 450℃), different strain rates (0.01S -1 , 0.1S -1 , 1S -1 , 10S -1 ) were tested on a magnesium plate and an aluminum plate, and the stress-strain curve and mechanical properties of the magnesium plate, and the stress-strain curve and mechanical properties of the aluminum plate were obtained. The mechanical properties include tensile strength, yield strength, elongation, and elastic modulus.

[0035] The magnesium plate and the aluminum plate each have a thickness of 0.5-8 mm. For example, the magnesium plate can be selected from any value between 0.5 and 8 mm, such as 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, and 8 mm. The aluminum plate can be selected from any value between 0.5 and 8 mm, such as 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, and 8 mm. The magnesium plate and the aluminum plate may have the same or different thicknesses. The strain of the aluminum plate and the magnesium plate can be 35-70%, preferably 40%-60%.

[0036] The magnesium plate is selected from any one of a pure metal magnesium plate, a Mg-Zn composite magnesium plate, a Mg-Mn composite magnesium plate, a Mg-RE composite magnesium plate, and a Mg-Al composite magnesium plate. The aluminum plate is selected from any one of a 1 series aluminum alloy plate, a 2 series aluminum alloy plate, a 3 series aluminum alloy plate, a 4 series aluminum alloy plate, a 5 series aluminum alloy plate, a 6 series aluminum alloy plate, and a 7 series aluminum alloy plate. The aluminum plate and the magnesium plate can each be selected from any one of an as-rolled, an extruded, and a cast state.

[0037] Then, according to the stress-strain curve of the aluminum plate, the strain value (denoted as S) is selected, and the temperature range of the aluminum plate corresponding to σb(Al) / σb(Mg)=0.8-1.2 (denoted as T Al ) and the strain rate range of the aluminum plate (denoted as ε Al ). According to the stress-strain curve of the magnesium plate, the strain value (denoted as S) is selected, and the temperature range of the magnesium plate corresponding to σb(Al) / σb(Mg)=0.8-1.2 (denoted as T Mg ) and the strain rate range of the magnesium plate (denoted as ε Mg ); Among them, the strain amount used for the magnesium plate is the same as the strain amount used for the aluminum plate, and the variable with the smaller deformation difference between the two is the strain amount.

[0038] Then, the rolling process was simulated using simulation software, wherein the mechanical properties of the magnesium plate obtained above, the temperature range T of the magnesium plate Mg and the strain rate range ε ​​of the magnesium plate Mg And the mechanical properties of the aluminum plate, the temperature range T of the aluminum plate Al and the strain rate ε of the aluminum plate Al The range and strain S are input into the simulation software to obtain the stress and strain field of the magnesium plate and the stress and strain field of the aluminum plate during the rolling process respectively;

[0039] According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature of the magnesium plate (denoted as T') is determined. Mg ), rolling temperature of aluminum plate (denoted as T' Al ), rolling strain rate (denoted as ε′) and rolling strain (denoted as S′) are taken as rolling parameters.

[0040] The aluminum and magnesium plates are pretreated, specifically by polishing the surfaces of the aluminum and magnesium plates to remove surface oil and oxides, and drilling holes in the aluminum and magnesium plates. The magnesium and aluminum plates are then heated in a heat treatment furnace at the rolling temperatures of the magnesium and aluminum plates, respectively, for 5-15 minutes.

[0041] Then, the preheated magnesium plate and aluminum plate are quickly riveted, and the riveting order is Al, Mg, and Al stacked in sequence, with the stacking layer number ≥ 2, and then rolled on a rolling mill at a rolling rate of the above-mentioned strain rate ε′.

[0042] In a second aspect, an embodiment of the present invention provides a magnesium-aluminum composite plate, which is prepared by the above-mentioned method for preparing a magnesium-aluminum composite plate.

[0043] The following describes a magnesium-aluminum composite plate and a preparation method thereof provided by the present invention in detail with reference to specific embodiments.

[0044] Example 1

[0045] This embodiment provides a method for preparing a 7075 / AZ31 / 7075 three-layer magnesium-aluminum composite plate, comprising:

[0046] The original thickness of the magnesium plate is 4mm, and the original thickness of the aluminum plate is 1mm. The magnesium plate is in an extruded state, and the aluminum plate is in a rolled state. Tensile specimens of the magnesium plate and the aluminum plate were cut respectively. Then, the tensile strength of the magnesium plate and the aluminum plate was tested on a high-temperature tensile machine at different temperatures (250℃, 300℃, 350℃, 400℃ and 450℃), different strain rates (0.01S -1 , 0.1S -1 , 1S -1 , 10S -1 The mechanical properties of magnesium plate and aluminum plate under ) are shown in Table 1, and the high temperature tensile diagram of AZ31 is shown in Figure 1 , 7075 high temperature tensile test diagram see Figure 2 .

[0047] The temperature range T of the aluminum plate corresponding to the strain S = 40% and the strength ratio of 7075 plate to magnesium plate is 0.8-1.2 Al is 400-450°C, the strain rate range of the aluminum plate is ε Al 1S -1 , 10S -1 、Temperature range of magnesium plate T Mg is 300-400°C, and the strain rate range of the magnesium plate ε Mg 0.1S -1 , 1S -1 .

[0048] The mechanical properties, T Al , ε Al 、T Mg and ε Mg Input into Abaqus simulation software, wherein the physical parameters and elastic modulus of magnesium plate and aluminum plate are obtained by reference, and the stress and strain field of magnesium plate and the stress and strain field of aluminum plate during rolling process are obtained respectively. The schematic diagram of rolling simulation is shown in Figure 3 .

[0049] According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature T' of the magnesium plate is determined respectively. Mg The rolling temperature of the aluminum plate is 350℃ and T' Al The rolling temperature is 450℃ and the rolling strain rate ε′ is 1S -1 And the rolling strain amount S′ is 50% as a rolling parameter.

[0050] The surfaces of the aluminum and magnesium plates were polished to remove surface oil and oxides, and holes were drilled in each plate. The magnesium and aluminum plates were then heated in a heat treatment furnace at the rolling temperatures of the magnesium and aluminum plates, respectively, for 15 minutes.

[0051] The preheated magnesium plate and aluminum plate are quickly riveted, and the riveting order is Al, Mg, and Al stacked in sequence, and then rolled and deformed on a rolling mill at a rolling rate of the above-mentioned strain rate ε′ to obtain the desired magnesium-aluminum composite plate.

[0052] Example 2

[0053] This embodiment provides a method for preparing a 1060 / AZ31 / 1060 three-layer magnesium-aluminum composite plate, comprising:

[0054] The original thickness of the magnesium plate is 4mm, and the original thickness of the aluminum plate is 2mm. The magnesium plate is in the rolled state, and the aluminum plate is in the rolled state. Tensile specimens of the magnesium plate and the aluminum plate were cut respectively. Then, the tensile strength of the magnesium plate and the aluminum plate was tested on a high-temperature tensile machine at different temperatures (250℃, 300℃, 350℃, 400℃ and 450℃), different strain rates (0.01S -1 , 0.1S -1 , 1S -1 , 10S -11 ) are shown in Table 1 and Table 2, respectively.

[0055] The temperature range T of the aluminum plate corresponding to the strain S = 50% and the strength ratio of 1060 plate to AZ31 plate is 0.8-1.2 Al is 250-350°C, the strain rate range of the aluminum plate is ε Al 0.1S -1 , 1S -1 、Temperature range of magnesium plate T Mg is 300-450°C, and the strain rate range of the magnesium plate is ε Mg 0.1S -1 , 1S -1 .

[0056] The mechanical properties, T Al , ε Al 、T Mg and ε Mg The data were input into the Abaqus simulation software, wherein the physical properties and elastic modulus of the magnesium plate and the aluminum plate were obtained by consulting the data, and the stress and strain field of the magnesium plate and the stress and strain field of the aluminum plate during the rolling process were obtained respectively.

[0057] According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature T' of the magnesium plate is determined respectively. Mg The rolling temperature of the aluminum plate is 425℃ and T' Al The rolling temperature is 250℃ and the rolling strain rate ε′ is 1S -1 And the rolling strain amount S′ is 50% as a rolling parameter.

[0058] The surfaces of the aluminum and magnesium plates were polished to remove surface oil and oxides, and holes were drilled in each plate. The magnesium and aluminum plates were then heated in a heat treatment furnace at the rolling temperatures of the magnesium and aluminum plates, respectively, for 15 minutes.

[0059] The preheated magnesium plate and aluminum plate are quickly riveted, and the riveting order is Al, Mg, and Al stacked in sequence, and then rolled and deformed on a rolling mill at a rolling rate of the above-mentioned strain rate ε′ to obtain the desired magnesium-aluminum composite plate.

[0060] Example 3

[0061] This embodiment provides a method for preparing a 6082 / AZ31 / 6082 three-layer magnesium-aluminum composite plate, comprising:

[0062] The original thickness of the magnesium plate is 2mm, and the original thickness of the aluminum plate is 1mm. The magnesium plate is in an extruded state, and the aluminum plate is in a rolled state. Tensile specimens of the magnesium plate and the aluminum plate were cut respectively. Then, the tensile strength of the magnesium plate and the aluminum plate was tested on a high-temperature tensile machine at different temperatures (250℃, 300℃, 350℃, 400℃ and 450℃), different strain rates (0.1S -1 , 1S -1 , 10S -1 ) are shown in Table 3.

[0063] The temperature range T of the aluminum plate corresponding to the strain S = 60% and the strength ratio of 6082 plate to magnesium plate is 0.8-1.2 Al is 300-400°C, the strain rate range of the aluminum plate is ε Al 0.1S -1 , 1S -1 , 10S-1 、Temperature range of magnesium plate T Mg is 300-400°C, and the strain rate range of the magnesium plate ε Mg 0.1S -1 , 1S -1 , 10S -1 .

[0064] The mechanical properties, T Al , ε Al 、T Mg and ε Mg The data were input into the Abaqus simulation software, wherein the physical properties and elastic modulus of the magnesium plate and the aluminum plate were obtained by consulting the data, and the stress and strain field of the magnesium plate and the stress and strain field of the aluminum plate during the rolling process were obtained respectively.

[0065] According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature T' of the magnesium plate is determined respectively. Mg The rolling temperature of the aluminum plate is 400℃ and T' Al The rolling temperature is 400℃ and the rolling strain rate ε′ is 1S -1 And the rolling strain amount S′ is 60% as a rolling parameter.

[0066] The surfaces of the aluminum and magnesium plates were polished to remove surface oil and oxides, and holes were drilled in each. The magnesium and aluminum plates were then heated in a heat treatment furnace at the rolling temperatures of the magnesium and aluminum plates, respectively, for 10 minutes.

[0067] The preheated magnesium plate and aluminum plate are quickly riveted, and the riveting order is Al, Mg, and Al stacked in sequence, and then rolled and deformed on a rolling mill at a rolling rate of the above-mentioned strain rate ε′ to obtain the desired magnesium-aluminum composite plate.

[0068] Table 1

[0069]

[0070] Table 2

[0071]

[0072] Table 3

[0073]

[0074] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for preparing a magnesium-aluminum composite plate, characterized in that: include: Performing high-temperature tensile tests on the magnesium plate and the aluminum plate to obtain the stress-strain curve and mechanical properties of the magnesium plate, the stress-strain curve and mechanical properties of the aluminum plate; According to the stress-strain curve of the magnesium plate, the strain value is selected, and the temperature range and strain rate range of the magnesium plate corresponding to σb(Al) / σb(Mg)=0.8-1.2 are selected; wherein the strain value used for the magnesium plate is the same as the strain value used for the aluminum plate; The rolling process is simulated using simulation software, wherein the mechanical properties of the magnesium plate, the temperature range of the magnesium plate, and the strain rate range of the magnesium plate, as well as the mechanical properties of the aluminum plate, the temperature range of the aluminum plate, the strain rate range of the aluminum plate, and the strain amount obtained above are input into the simulation software to obtain the stress and strain field of the magnesium plate and the stress and strain field of the aluminum plate during the rolling process, respectively; According to the above simulation results, the Mg / Al strain ratio is selected as 0.9-1, and the appropriate rolling temperature of the magnesium plate, the rolling temperature of the aluminum plate, the rolling strain rate and the rolling strain amount are determined as rolling parameters; Then, the magnesium plate and the aluminum plate are preheated according to the rolling temperature of the magnesium plate and the rolling temperature of the aluminum plate obtained above; Next, the preheated aluminum plates and magnesium plates are stacked in the order of aluminum / magnesium / aluminum, and then rolled at the above-mentioned rolling strain rate.

2. The method for preparing the magnesium-aluminum composite plate according to claim 1, wherein: include: The magnesium plate and the aluminum plate are tested at different temperatures and different strain rates to obtain stress-strain curves and mechanical properties of the magnesium plate, and stress-strain curves and mechanical properties of the aluminum plate; Including: at 250℃, 300℃, 350℃, 400℃ and 450℃ and 0.01S -1 , 0.1 S -1 , 1 S -1 , 10 S -1 The magnesium plate and the aluminum plate are tested respectively to obtain a stress-strain curve of the magnesium plate and mechanical properties of the magnesium plate, and a stress-strain curve of the aluminum plate and mechanical properties of the aluminum plate.

3. The method for preparing the magnesium-aluminum composite plate according to claim 1, wherein: Before preheating, the aluminum plate and the magnesium plate are pretreated respectively.

4. The method for preparing the magnesium-aluminum composite plate according to claim 3, characterized in that: Preprocessing includes: Sanding surfaces, removing surface stains, and drilling.

5. The method for preparing the magnesium-aluminum composite plate according to claim 1, wherein: The preheating time is 5-15 minutes.

6. The method for preparing the magnesium-aluminum composite plate according to claim 1, wherein: The number of stacked layers is ≥2.

7. The method for preparing the magnesium-aluminum composite plate according to claim 1, wherein: The magnesium plate and the aluminum plate are riveted together after preheating and before stacking.

8. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The thickness of the magnesium plate and the aluminum plate are respectively 0.5-8 mm.

9. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The magnesium plate is selected from any one of a pure metal magnesium plate, a Mg-Zn composite magnesium plate, a Mg-Mn composite magnesium plate, a Mg-RE composite magnesium plate and a Mg-Al composite magnesium plate.

10. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The aluminum plate is selected from any one of 1 series aluminum alloy plate, 2 series aluminum alloy plate, 3 series aluminum alloy plate, 4 series aluminum alloy plate, 5 series aluminum alloy plate, 6 series aluminum alloy plate and 7 series aluminum alloy plate.

11. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The aluminum plate and the magnesium plate can be selected from any one of rolled, extruded and cast states, respectively.

12. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The strain amounts of the aluminum plate and the magnesium plate are respectively 35-70%.

13. The method for preparing a magnesium-aluminum composite plate according to any one of claims 1 to 7, characterized in that: The strain amounts of the aluminum plate and the magnesium plate are respectively 40%-60%.

14. A magnesium-aluminum composite plate, characterized in that: The magnesium-aluminum composite plate is prepared by the preparation method of any one of claims 1 to 13.

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