Magnesium / aluminum laminated composite plate with high modulus and high damping and preparation method thereof

Abstract

The application discloses a preparation method of magnesium / aluminum layered composite plate with high modulus and high damping, comprising the following steps: 1) riveting aluminum plate / magnesium plate / aluminum plate in sequence to form a blank, and adding metal powder between the magnesium and aluminum to obtain a composite plate blank; 2) placing the composite plate blank into a heating furnace to perform single-pass rolling to obtain an aluminum / magnesium / aluminum composite plate; 3) annealing the aluminum / magnesium / aluminum composite plate, then performing flattening and straightening, cutting into a required size, and performing at least three-layer cumulative accumulative roll bonding to obtain a superimposed composite plate; and 4) performing heat preservation, flattening and straightening on the superimposed composite plate to obtain the magnesium / aluminum layered composite plate with high modulus and high damping. The magnesium / aluminum layered composite plate provided by the application has a tensile strength of 250-300 MPa, an interface strength of 75-90 MPa, an elastic modulus of 50-62 Gpa, and a Q ‑1 value of 0.015-0.025, and has the advantages of light weight, high modulus and high damping, and can be widely applied in the fields of aerospace, 3C electronics, military industry and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of layered metal composite plates, and particularly relates to a magnesium / aluminum layered composite plate with high modulus and high damping and a preparation method thereof. BACKGROUND

[0002] Magnesium has excellent damping performance in structural metals because it is easy to activate dislocation slip and twinning, making it an attractive choice for structural components that require lightweight, low vibration and low noise. However, the strategy to improve the strength of magnesium alloys often reduces their damping performance. Single magnesium alloys often have difficulty achieving more excellent comprehensive performance through the matching of organization, structure and function, such as the developed high-damping magnesium alloys, such as Mg-Zr series alloys, which generally have low elastic modulus (39GPa-45GPa) and low strength, which to a large extent limits the further development and application of magnesium alloys in practical engineering. The conventional way to improve the damping and strength of magnesium alloys is to introduce additional particles, precipitate phases, and introduce solid solution atoms to achieve the matching of strength and damping. For example, patent No. CN201410376527.4 discloses a high-damping magnesium alloy containing rare earth yttrium and a manufacturing method thereof, which balances the strength and damping performance through the rare earth long-period stacking ordered (LPSO) phase to achieve optimal performance matching. For example, patent No. CN202211265931.5 discloses a preparation method of a high-damping magnesium alloy, which is subjected to solid solution and aging treatment, and then subjected to ECAP deformation treatment to obtain a high-damping magnesium alloy; ECAP deformation causes a large number of dislocations in the magnesium alloy structure, forming dislocation damping, thereby improving the damping performance of the material. This method often needs to control the dislocation density or the amount of precipitated phase to regulate the balance of strength and damping performance.

[0003] Magnesium / aluminum composite plates have the lightness of magnesium and the high modulus of aluminum, but magnesium and aluminum belong to different crystal structures, and the deformation is uneven during rolling, and intermetallic compounds are easily formed during hot rolling. How to realize the synchronous improvement of damping performance and modulus through the organization and interface regulation of the rolling process is a difficult problem that technicians in the field urgently need to overcome. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the main purpose of the present application is to provide a magnesium / aluminum layered composite plate with high modulus and high damping and a preparation method thereof, which aims to solve the problems of difficult synchronous improvement of modulus and damping performance in single magnesium alloys and difficult regulation of hard and brittle intermetallic compounds in magnesium / aluminum composite plates.

[0005] The purpose of the present application is achieved by the following technical scheme:

[0006] The first aspect is a preparation method of a magnesium / aluminum layered composite plate with high modulus and high damping, comprising the following steps:

[0007] 1) sequentially riveting aluminum plate / magnesium plate / aluminum plate to form a blank, and adding metal powder between the magnesium plate and the aluminum plate to obtain a composite plate blank;

[0008] 2) placing the composite plate blank in a heating furnace for single-pass rolling to obtain an aluminum / magnesium / aluminum composite plate;

[0009] 3) annealing the aluminum / magnesium / aluminum composite plate, then cutting the aluminum / magnesium / aluminum composite plate into a desired size after being flattened and straightened, and performing at least three layers of accumulative roll bonding to obtain a stacked composite plate;

[0010] 4) performing heat preservation, flattening and straightening on the stacked composite plate to obtain a magnesium / aluminum layered composite plate with high modulus and high damping.

[0011] In some specific embodiments, the metal powder is a Ni50Ti50 metal powder with a particle size of 30-100 μm.

[0012] In some specific embodiments, the metal powder has a thickness of 30-100 μm.

[0013] In some specific embodiments, the process parameters of the single-pass rolling in step 2) are as follows: preheating at a temperature of 350-450°C for 10-20 min, and then a pass reduction of 50-65%.

[0014] In some specific embodiments, the magnesium structure in the aluminum / magnesium / aluminum composite plate of step 2) contains a large number of shear bands, and the grain size in the shear bands is 1-10 μm.

[0015] In some specific embodiments, the process parameters of the annealing in step 3) are as follows: annealing at a temperature of 350-400°C for 0.5-4 h.

[0016] In some specific embodiments, the process parameters of the accumulative roll bonding in step 4) are as follows: a rolling temperature of 350-450°C, a heat preservation time of 10-20 min, and a pass reduction of 50-65%.

[0017] In some specific embodiments, the process parameters of the annealing and straightening in step 4) are as follows: heat preservation at a temperature of 250-350°C for 5-15 min, and then flattening and straightening.

[0018] In some specific embodiments, the magnesium plate is an AZ31 or AM60 magnesium alloy, and the aluminum plate is a 3-series or 5-series aluminum alloy.

[0019] In a second aspect, the magnesium / aluminum layered composite plate with high modulus and high damping prepared by the preparation method has a ratio of total thickness of the magnesium plate layer to total thickness of the aluminum plate layer of 0.55 to 1.22, and at least five magnesium / aluminum heterogeneous interfaces.

[0020] Further, the magnesium / aluminum layered composite plate has a tensile strength of 250 to 300 MPa, an interface strength of 75 to 90 MPa, an elastic modulus of 50 to 62 Gpa, and a Q -1 value of 0.015 to 0.025.

[0021] Compared with the prior art, the magnesium / aluminum layered composite plate has at least the following advantages:

[0022] The magnesium / aluminum layered composite plate with high modulus and high damping provided by the application can isolate the interface reaction between magnesium and aluminum by regulating the structure of the composite plate and introducing a heterogeneous interface, and can improve the elastic modulus of the composite plate by adding Ni50Ti50 metal powder at the heterogeneous interface; the strength and damping performance of the composite plate are simultaneously improved by the back stress strengthening effect and interface damping of the heterogeneous interface; the magnesium / aluminum composite plate with good strength-plasticity matching is prepared by controlling the initial rolling process; and the magnesium / aluminum layered composite plate containing multiple heterogeneous interfaces is prepared by cumulative pack rolling. The magnesium / aluminum layered composite plate prepared by the process has a tensile strength of 250 to 300 MPa, an interface strength of 75 to 90 MPa, an elastic modulus of 50 to 62 Gpa, and a Q -1 value of 0.01 to 0.025, and has the advantages of light weight, high modulus and high damping, and can be widely applied in the fields of aerospace, 3C electronics, military industry and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the application, the drawings required for use in the specific embodiments or prior art description will be briefly introduced.

[0024] Figure 1 is an interface SEM diagram of the magnesium / aluminum composite plate in Example 2 provided by the application;

[0025] Figure 2 is an interface EDS diagram of the magnesium / aluminum composite plate in Example 2 provided by the application;

[0026] Figure 3 is a structure diagram of the magnesium component of the magnesium / aluminum composite plate in Example 2 provided by the application;

[0027] Figure 4 is a structure diagram of the aluminum component of the magnesium / aluminum composite plate in Example 2 provided by the application;

[0028] Figure 5 is a mechanical property curve of the magnesium / aluminum composite plate in Example 2 provided by the present application;

[0029] Figure 6 is a preparation process flow chart of Example 2 and Comparative Example 3. DETAILED DESCRIPTION

[0030] The present application is further described below in conjunction with the accompanying drawings and examples, which are merely illustrative and not restrictive, and cannot limit the protection scope of the present application.

[0031] When a quantity, concentration or other value or parameter is expressed in a range, or a preferred range, or a range of preferred values, it is understood that any and every concentration, value, or other parameter between the upper and lower limit of that range, and any and every concentration, value, or other parameter within that range is specifically contemplated unless otherwise indicated. The enumerated numerical ranges are inclusive of the recited endpoints, and all integers and fractions within the ranges.

[0032] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0033] The materials, methods, and examples herein are illustrative only and, except as specifically stated, are not to be construed as limitations.

[0034] In the following examples, the magnesium alloy is purchased from Shanxi Yinguang Magnesium Industry; the magnesium plate is selected from AZ31 magnesium alloy; and the aluminum plate is a 3-series aluminum alloy.

[0035] The test methods used in the following examples include:

[0036] The mechanical properties and damping properties of the magnesium / aluminum layered composite plate are embodied by testing the main properties of each test sample respectively. The main properties tested in the present application include tensile strength, elastic modulus and interface strength test, damping property test, etc.

[0037] 1) Mechanical property test

[0038] The universal tensile testing machine equipment is used to test the mechanical properties and elastic modulus according to the metal material tensile test method specified in GB / T 228;

[0039] 2) Damping property test

[0040] The DMA equipment is used to test the damping properties of the samples according to the method in GB / T 18258;

[0041] Unless otherwise specified in the examples, the procedures should be performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0042] Example 1

[0043] This embodiment provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping, including the following steps:

[0044] (1) Select magnesium plate and aluminum plate, grind the surface to roughen it, and remove surface oxides and impurities; then rivet the blanks in the order of aluminum plate / magnesium plate / aluminum plate, add Ni50Ti50 metal powder between magnesium plate and aluminum plate to obtain composite blank;

[0045] (2) After preheating the composite slab at 400℃ for 15 minutes, the aluminum / magnesium / aluminum composite plate is obtained by reducing the pressure by 60%.

[0046] (3) After annealing the aluminum / magnesium / aluminum composite plate at 400℃ for 4 hours, the aluminum / magnesium / aluminum composite plate is flattened and straightened and then cut into the required size;

[0047] (4) Take three aluminum / magnesium / aluminum composite plates cut in step (3), grind the surface, and then perform cumulative rolling. The process parameters for cumulative rolling are: rolling temperature of 400℃, holding time of 15min, and reduction per pass of 50%, to obtain the superimposed composite plate.

[0048] (5) After keeping the superimposed composite plate in step (4) at 300℃ for 10 minutes, it is stretched and straightened to obtain a magnesium / aluminum layered composite plate with high modulus and high damping containing six magnesium and aluminum heterogeneous interfaces.

[0049] In this embodiment, the ratio of the total thickness of the magnesium plate layer to the total thickness of the aluminum plate layer in the magnesium / aluminum layered composite plate is 1.

[0050] This application tests the mechanical and damping properties of a magnesium / aluminum layered composite plate with both high modulus and high damping. Mechanical properties were tested on a universal testing machine according to GB / T 228.1-2021 standard, and damping properties were tested on a DMA device according to GB / T 18258-2020 standard. The results show that the elastic modulus of the magnesium / aluminum layered composite plate is 52 GPa, and Q... -1 The value is 0.015, the interfacial strength is 85 MPa, and the tensile strength is 280 MPa.

[0051] Example 2

[0052] This embodiment provides a method for preparing a magnesium / aluminum layered composite plate that combines high modulus and high damping, such as... Figure 6 As shown, it includes the following steps:

[0053] (1) Select magnesium plate and aluminum plate, grind the surface to roughen it, and remove surface oxides and impurities; then rivet the blanks in the order of aluminum plate / magnesium plate / aluminum plate, add Ni50Ti50 metal powder between magnesium plate and aluminum plate to obtain composite blank;

[0054] (2) After preheating the composite slab at 400℃ for 15 minutes, an aluminum / magnesium / aluminum composite plate is obtained by reducing the thickness by 50%. Figure 1 and Figure 2 It is known that Ni50Ti50 metal powder is uniformly distributed at the interface of the composite plate, and the interface bonding is good; Figure 3 and Figure 4 It is known that a large number of shear bands are formed in the magnesium component of the aluminum / magnesium / aluminum composite plate, and the shear bands contain a large number of fine grains with a grain size of 1-10μm;

[0055] (3) After annealing the aluminum / magnesium / aluminum composite plate at 400℃ for 2 hours, the aluminum / magnesium / aluminum composite plate is flattened and straightened and then cut into the required size;

[0056] (4) Take four aluminum / magnesium / aluminum composite plates cut in step (3), grind the surface, and then perform cumulative rolling. The process parameters for cumulative rolling are: rolling temperature of 400℃, holding time of 15min, and reduction per pass of 60%, to obtain the superimposed composite plate.

[0057] (5) After keeping the superimposed composite plate in step (4) at 300℃ for 10 minutes, it is stretched and straightened to obtain a magnesium / aluminum layered composite plate with high modulus and high damping containing eight magnesium and aluminum heterogeneous interfaces.

[0058] In this embodiment, the ratio of the total thickness of the magnesium plate layer to the total thickness of the aluminum plate layer in the magnesium / aluminum layer composite plate is 0.82.

[0059] In this embodiment, the aluminum / magnesium / aluminum composite plate prepared in step (2) was subjected to morphology and microstructure tests. The SEM images of the results are shown below. Figure 1 , 2 As shown in the figure, Ni50Ti50 metal powder is uniformly distributed at the interface of the composite plate, indicating good interfacial bonding; its EBSD image is shown below. Figure 3 , 4 As shown in the figure, a large number of shear bands are formed in the magnesium component of the aluminum / magnesium / aluminum composite plate. The shear bands contain a large number of fine grains with a grain size of 1-10μm.

[0060] This application tests the mechanical and damping properties of the prepared magnesium / aluminum layered composite plate with both high modulus and high damping. The mechanical properties were tested on a universal testing machine according to the GB / T 228.1-2021 standard, and the results are as follows. Figure 5The composite plate shown exhibits good strength-ductility matching, with a tensile strength of 300 MPa and an elongation of 17.5%. Its damping performance was tested on a DMA device according to the GB / T 18258-2020 standard, and the result was a Q0.05 for this magnesium-aluminum layered damping. -1 The value is 0.025, the elastic modulus of the composite board is 62 GPa, and the interfacial strength is 90 MPa.

[0061] Example 3

[0062] This embodiment provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping, including the following steps:

[0063] (1) Select magnesium plate and aluminum plate, grind the surface to roughen it, and remove surface oxides and impurities; then rivet the blanks in the order of aluminum plate / magnesium plate / aluminum plate, add Ni50Ti50 metal powder between magnesium plate and aluminum plate to obtain composite blank;

[0064] (2) After preheating the composite slab at 350℃ for 15 minutes, the aluminum / magnesium / aluminum composite plate is obtained by reducing the pressure by 50%.

[0065] (3) After annealing the aluminum / magnesium / aluminum composite plate at 350℃ for 4 hours, the aluminum / magnesium / aluminum composite plate is flattened and straightened and then cut into the required size;

[0066] (4) Take six aluminum / magnesium / aluminum composite plates cut in step (3), grind the surface, and then perform cumulative rolling. The process parameters for cumulative rolling are: rolling temperature of 400℃, holding time of 15min, and reduction per pass of 50%, to obtain the superimposed composite plate.

[0067] (5) After keeping the superimposed composite plate in step (4) at 300℃ for 10 minutes, it is stretched and straightened to obtain a magnesium / aluminum layered composite plate with high modulus and high damping containing twelve magnesium and aluminum heterogeneous interfaces.

[0068] In this embodiment, the ratio of the total thickness of the magnesium plate layer to the total thickness of the aluminum plate layer in the magnesium / aluminum layered composite plate is 1.

[0069] This application tests the mechanical and damping properties of a magnesium / aluminum layered composite plate with both high modulus and high damping. Mechanical properties were tested on a universal testing machine according to GB / T 228.1-2021 standard, and damping properties were tested on a DMA device according to GB / T 18258-2020 standard. The results show that the elastic modulus of the magnesium / aluminum layered composite plate is 55 GPa, and Q... -1 The value is 0.020, the interfacial strength is 75 MPa, and the tensile strength is 290 MPa.

[0070] Comparative Example 1

[0071] This comparative example provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping, which is basically the same as that in Example 2, except that the rolling temperature in step (4) is changed. Specifically, four aluminum / magnesium / aluminum composite plates cut in step (3) are taken, their surfaces are polished, and then cumulatively rolled. The process parameters for cumulative rolling are: rolling temperature of 250°C, holding time of 15 min, and reduction per pass of 60%.

[0072] The applicant discovered that the aluminum / magnesium / aluminum composite plate after step (4) was not composite.

[0073] Comparative Example 2

[0074] This comparative example provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping, which is basically the same as that in Example 2, except that the rolling temperature in step (4) is changed. Specifically, four aluminum / magnesium / aluminum composite plates cut in step (3) are taken, their surfaces are polished, and then cumulatively rolled. The process parameters for cumulative rolling are: rolling temperature of 300℃, holding time of 15min, and reduction per pass of 60%.

[0075] The applicant found that the magnesium structure in the aluminum / magnesium / aluminum composite plate after step (4) did not contain shear bands.

[0076] This application tested the mechanical properties of the prepared magnesium / aluminum layered composite plate, which possesses both high modulus and high damping. The results showed that the elastic modulus of the magnesium / aluminum layered composite plate was 61 GPa, and the Q... -1 The value is 0.015, the interfacial strength is 85 MPa, and the tensile strength is 285 MPa.

[0077] Comparative Example 3

[0078] This comparative example provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping. The only difference from Example 2 is that it does not involve cumulative stacking rolling, but instead uses a single large deformation rolling process. Figure 6 As shown, the specific steps include the following:

[0079] (1) Select magnesium plates and aluminum plates, and roughen the surface (the total thickness of the magnesium plate and the total thickness of the aluminum plate are the same as the total thickness of the magnesium plate and the aluminum plate of the four aluminum / magnesium / aluminum composite plates in Example 2. For example, the total thickness of the magnesium plate of the four aluminum / magnesium / aluminum composite plates in Example 2 is 4mm and the total thickness of the aluminum plate is 4mm, while the single magnesium plate in the comparative example is 4mm and the single aluminum plate is 2mm*2=4mm), and remove surface oxides and impurities; then rivet them in the order of aluminum plate / magnesium plate / aluminum plate, and add Ni50Ti50 metal powder between the magnesium plate and the aluminum plate to obtain the composite plate blank;

[0080] (2) After preheating the composite slab at 400℃ for 15 minutes, the aluminum / magnesium / aluminum composite plate is obtained by reducing the pressure by 60%.

[0081] (3) Anneal and straighten the aluminum / magnesium / aluminum composite plate at 300℃ for 10 min to obtain a magnesium / aluminum layered composite plate containing two magnesium and aluminum heterogeneous interfaces.

[0082] The mechanical properties of the magnesium / aluminum layered composite plate with both high modulus and high damping prepared in this comparative example were tested. The results showed that the elastic modulus of the magnesium / aluminum layered composite plate was 52 GPa, and the Q... -1 The value is 0.01, the interfacial strength is 80 MPa, and the tensile strength is 290 MPa.

[0083] Comparative Example 4

[0084] This comparative example provides a method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping. The preparation method is basically the same as that in Example 2, except that Ni50Ti50 metal powder is not added between the magnesium plate and the aluminum plate in step (1). Specifically:

[0085] Magnesium plates and aluminum plates are selected, and their surfaces are roughened by grinding to remove surface oxides and impurities. Then, the blanks are riveted together in the order of aluminum plate / magnesium plate / aluminum plate to obtain composite blanks.

[0086] The mechanical properties of the magnesium / aluminum layered composite plate with both high modulus and high damping prepared in this comparative example were tested. The results showed that the elastic modulus of the magnesium / aluminum layered composite plate was 55 GPa, and the Q... -1 The value is 0.020, the interfacial strength is 60MPa, and the tensile strength is 290MPa.

[0087] In summary, this application presents a high-modulus and high-damping magnesium / aluminum layered composite plate. By adding Ni50Ti50 at the interface, an aluminum / magnesium / aluminum composite plate is first prepared through an initial single-pass rolling process, and then through cumulative stacking rolling to prepare the magnesium / aluminum layered composite plate. The aluminum and magnesium plates are arranged in alternating layers, with more than five heterogeneous interfaces. The magnesium / aluminum layered composite plate prepared by this invention can significantly improve the modulus and damping properties of magnesium alloys. The layered structure design can significantly improve the damping performance and the balance between strength and plasticity. A comparison of Example 2 and Comparative Example 1 shows that the temperature of cumulative rolling needs to be controlled; at low temperatures, the composite plate cannot be laminated. A comparison of Example 2 and Comparative Example 2 also shows that lower rolling temperatures increase the deformation resistance and flow stress of the magnesium component, and the small-angle grain boundaries prevent the formation of shear bands, resulting in a composite plate with weaker strength, plasticity, and damping properties than in Example 2. A comparison of Example 2 and Comparative Example 3 shows that cumulative rolling can improve the mechanical properties and damping properties of the magnesium / aluminum layered composite plate, thus enhancing its overall performance. A comparison of Example 2 and Comparative Example 4 shows that adding Ni50Ti50 metal powder can improve the interfacial strength and elastic modulus of the composite plate.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a magnesium / aluminum layered composite plate with both high modulus and high damping, characterized in that, Includes the following steps: 1) Rivet aluminum plates / magnesium plates / aluminum plates sequentially to form a composite billet, while adding metal powder between the magnesium plates / aluminum plates to obtain a composite billet; 2) The composite slab is placed in a heating furnace for single-pass rolling to obtain an aluminum / magnesium / aluminum composite plate; 3) After annealing the aluminum / magnesium / aluminum composite plate, the aluminum / magnesium / aluminum composite plate is flattened and straightened and then cut into the required size. It is then subjected to at least three layers of cumulative rolling to obtain the superimposed composite plate. 4) The superimposed composite plate is heat-insulated, stretched, and straightened to obtain a magnesium / aluminum layered composite plate with both high modulus and high damping. The metal powder is Ni50Ti50 metal powder with a particle size of 30-100μm and a thickness of 50-300μm; the process parameters for single-pass rolling in step 2) are: preheating at 350-450℃ for 10-20min, and a reduction of 50-65% per pass; and the process parameters for cumulative rolling in step 3) are: rolling temperature of 350-450℃, holding time of 10-20min, and a reduction of 50-65% per pass.

2. The method for preparing the magnesium / aluminum layered composite plate with both high modulus and high damping according to claim 1, characterized in that, The magnesium microstructure in the aluminum / magnesium / aluminum composite plate of step 2) contains a large number of shear bands, and the grain size in the shear bands is 1-10 μm.

3. The method for preparing the magnesium / aluminum layered composite plate with both high modulus and high damping according to claim 2, characterized in that, The annealing process parameters described in step 3) are annealing at 350-400℃ for 0.5-4h.

4. The method for preparing the magnesium / aluminum layered composite plate with both high modulus and high damping according to claim 1, characterized in that, The process parameters for heat preservation, leveling and straightening in step 4) are as follows: after heat preservation at 250-350℃ for 5-15 minutes, leveling and straightening are performed.

5. The method for preparing the magnesium / aluminum layered composite plate with both high modulus and high damping according to claim 4, characterized in that, The magnesium plate is AZ31 or AM60 magnesium alloy; the aluminum plate is 3-series or 5-series aluminum alloy.

6. A magnesium / aluminum layered composite plate with both high modulus and high damping, prepared by the method according to any one of claims 1-5, characterized in that, The ratio of the total thickness of the magnesium plate layer to the total thickness of the aluminum plate layer in the magnesium / aluminum layer composite plate with high modulus and high damping is 0.55 to 1.22, and it includes at least five magnesium and aluminum heterogeneous interfaces.

7. The magnesium / aluminum layered composite plate with both high modulus and high damping as described in claim 6, characterized in that, The magnesium / aluminum layered composite plate, which combines high modulus and high damping, has a tensile strength of 250-300 MPa, an interfacial strength of 75-90 MPa, and an elastic modulus of 50-62 GPa. -1 The value is 0.015-0.025.

Images