A layered aluminum-based composite sheet and its preparation method

Abstract

The present invention discloses a laminated aluminum-based composite sheet and a preparation method thereof, belonging to the technical field of aluminum-based composite materials. The first aluminum material and the second aluminum material are subjected to solution treatment to eliminate the internal stress in the aluminum materials, and the alloying elements in the second aluminum material are completely dissolved into the lattice of aluminum. After coarsening treatment, the pretreated first aluminum material and the pretreated second aluminum material are obtained. The pretreated first aluminum material, the pretreated second aluminum material and the pretreated first aluminum material are stacked, heated and subjected to primary rolling, and then cooled to obtain the laminated aluminum-based composite sheet. The laminated aluminum-based composite sheet prepared by the present invention has good interfacial bonding and good comprehensive mechanical properties. Since both the first aluminum material and the second aluminum material are aluminum alloys and have good compatibility, there is no oxide layer at the interfacial bonding of the sheet, thereby improving the bonding quality at the interface.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum matrix composites, and particularly relates to a laminated aluminum matrix composite plate and a preparation method thereof. Background Art

[0002] Due to the excellent comprehensive properties of aluminum and aluminum alloy materials, such as high specific strength, good plasticity and processing performance, they are widely used in industries, such as aerospace, automotive, bridge, construction, energy power, metallurgical chemical industry, machinery manufacturing and other fields. However, commercially pure aluminum has disadvantages such as low strength, active chemical properties, and easy formation of oxide layers on the surface, which severely limits its applications. Aluminum matrix composite plates have better high-temperature performance, wear resistance, oxidation resistance, corrosion resistance, etc. compared with pure aluminum materials, and have been widely used in military, aviation, aerospace and civilian fields.

[0003] Ultra-fine grain structures can be prepared in metal materials by means of severe plastic deformation. Such structures can endow materials with both high strength and high plasticity. Therefore, the preparation of composite materials by severe plastic deformation has attracted much attention. Existing severe plastic deformation methods mainly include equal-channel angular pressing, high-pressure torsion method, and accumulative roll bonding method. Among them, the accumulative roll bonding method is a method for preparing metal plates with ultra-fine grain structures using traditional rolling equipment, which has the advantages of simple preparation method, low equipment requirements, low cost, short production cycle, easy industrialization, easy performance regulation, etc., and is a relatively mature method for preparing laminated aluminum matrix composites. By the accumulative roll bonding method, a large number of dislocations and substructures can be introduced into the material to achieve the effect of grain refinement, realize dislocation strengthening and grain boundary strengthening, and improve the comprehensive mechanical properties of the material. However, there are also certain problems in the process of preparing materials by the accumulative roll bonding method: as the number of roll bonding increases, the number of interfaces increases, so there is poor bonding, which reduces the mechanical properties of the material; for metal plates fixed by rivets, there are inconsistent deformations of heterogeneous plates and poor coordination during the rolling process, resulting in interface cracking, which reduces the mechanical properties of the material; in order to improve the plastic deformation ability of the plate, the material is preheated before rolling, and oxides may be formed at the bonding surface during this process, which affects the interface bonding quality and the mechanical properties of the material. Summary of the Invention

[0004] In view of the above problems, the present invention provides a laminated aluminum matrix composite plate and a preparation method thereof, which effectively solve the technical problems of interface cracking, poor bonding, formation of oxides at the bonding interface during rolling treatment, affecting the interface bonding quality and material properties when preparing composite materials by the accumulative roll bonding method, and at the same time provide a laminated aluminum matrix composite plate with excellent mechanical properties.

[0005] The first object of the present invention is to provide a preparation method of a laminated aluminum matrix composite plate, comprising the following steps:

[0006] The first aluminum material and the second aluminum material are solution-treated at 480°C to 540°C to eliminate the internal stress of the aluminum materials and completely dissolve the alloy elements in the second aluminum material into the lattice of aluminum, and then coarsening treatment is carried out to obtain the pretreated first aluminum material and the pretreated second aluminum material.

[0007] Using the pretreated first aluminum material as the surface layer and the pretreated second aluminum material as the core layer, stack them according to the structure of surface layer - core layer - surface layer, heat at 380°C to 420°C and perform one-pass rolling, then cool to obtain a laminated aluminum-based composite sheet.

[0008] As a preferred embodiment, after one-pass rolling, a single-pass rolled sheet is obtained, and coarsening treatment is carried out. The single-pass rolled sheet is cut and stacked, and then rolled again at 350°C to 450°C.

[0009] As a preferred embodiment, after the second rolling, a double-pass rolled sheet is obtained. The double-pass rolled sheet is cut and stacked, and then rolling treatment is carried out at 350°C to 450°C. The rolling treatment is repeated 1 to 3 times.

[0010] As a preferred embodiment, the speeds of the one-pass rolling and the second rolling are both 0.4 m / s, and the reduction per pass is 50%.

[0011] As a preferred embodiment, the first aluminum material is 1061Al, 1050Al, 1070Al or 1100Al; the second aluminum material is 6061Al, 6060Al, 6063Al or 6463Al.

[0012] As a preferred embodiment, the time of the solution treatment is 30 min to 60 min.

[0013] As a preferred embodiment, the time of the heating is 10 min to 20 min.

[0014] As a preferred embodiment, the coarsening treatment is specifically: sanding with sandpaper having a mesh number ≤ 80, and then washing with ultrasonic acetone after sanding.

[0015] As a preferred embodiment, before the coarsening treatment, the oxide film and oil stain on the surface of the aluminum material are removed; after the coarsening treatment, the surface roughness of the sheet is ≥ Ra3.2.

[0016] The second object of the present invention is to provide a laminated aluminum-based composite sheet prepared by the preparation method of the above-mentioned laminated aluminum-based composite sheet.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] The present invention provides a laminated aluminum-based composite sheet and a preparation method thereof. First, the first aluminum material and the second aluminum material are subjected to solution treatment at 480°C to 540°C to eliminate the internal stress of the aluminum material and completely dissolve the alloying elements in the second aluminum material into the lattice of aluminum. On the one hand, it improves the plastic deformation ability of the material and prevents the sample from breaking when the deformation amount is too large. On the other hand, since the second aluminum material has a poorer deformation ability than the first aluminum material, after solution treatment, the deformation coordination of the two aluminum materials can be effectively improved. Then, roughening treatment is carried out to obtain the pretreated first aluminum material and the pretreated second aluminum material, which can not only improve the friction between the aluminum sheets, improve the deformation coordination of the sheets with different materials, but also increase the contact area of the interface, promote atomic diffusion during hot rolling, and achieve metallurgical bonding, thereby improving the interface bonding quality. Stack the pretreated first aluminum material, the pretreated second aluminum material and the pretreated first aluminum material, heat at 380°C to 420°C and perform a first rolling, and then cool to obtain a laminated aluminum-based composite sheet. During hot rolling, the material gradually softens, improving the deformation ability of the material; under the combined action of temperature and pressure, it promotes atomic interdiffusion at the interface more easily to achieve metallurgical bonding, thereby improving the interface quality; dynamic recovery and dynamic recrystallization occur during hot rolling, thus realizing grain refinement and improving the comprehensive mechanical properties of the material.

[0019] The preparation method of the laminated aluminum-based composite sheet of the present invention is simple, low in cost and short in production cycle. The prepared laminated aluminum-based composite material sheet has good interface bonding and good comprehensive mechanical properties. Since both the first aluminum material and the second aluminum material are aluminum alloys and have good compatibility, there is no oxide layer at the interface of the sheet, thereby improving the bonding quality at the interface. Brief Description of the Drawings

[0020] Figure 1 is a cross-sectional view of the laminated aluminum-based composite sheet prepared in Example 1 of the present invention.

[0021] Figure 2 is a cross-sectional view of the laminated aluminum-based composite sheet prepared in Example 2 of the present invention.

[0022] Figure 3 is a cross-sectional view of the laminated aluminum-based composite sheet prepared in Example 3 of the present invention.

[0023] Figure 4 is a cross-sectional view of the laminated aluminum-based composite sheet prepared in Example 4 of the present invention.

[0024] Figure 5 is a cross-sectional view of the laminated aluminum-based composite sheet prepared in Example 5 of the present invention. Detailed Description of the Embodiments

[0025] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments, but the embodiments cited do not limit the present invention. The following test methods and detection methods are all conventional methods unless otherwise specified; the reagents and raw materials are all commercially available unless otherwise specified.

[0026] Regarding the existing preparation method of composite aluminum materials: Although the accumulative roll-bonding method can introduce a large number of dislocations and substructures into the material, achieve the effect of grain refinement, realize dislocation strengthening and grain boundary strengthening, and improve the comprehensive mechanical properties of the material, there are also certain problems in the process of preparing materials by the accumulative roll-bonding method. First, due to the increase in the number of rolling passes and the increase in the number of interfaces, the interface bonding is not tight, resulting in a reduction in the mechanical properties of the material; second, for the metal plates fixed by rivets, due to the inconsistent deformation of heterogeneous plates and poor coordination during the rolling process, interface cracking occurs, resulting in a reduction in the mechanical properties of the material; third, although preheating the material before rolling can improve the plastic deformation ability of the plate, this will cause oxides to form at the bonding surface, affecting the interface bonding quality and the mechanical properties of the material. Based on the above technical problems, the present invention provides a laminated aluminum-based composite plate and its preparation method.

[0027] The technical solution of the present invention will be described in detail below.

[0028] The present invention first provides a preparation method of a laminated aluminum-based composite plate, comprising the following steps:

[0029] The first aluminum material and the second aluminum material are subjected to solution treatment at 480°C to 540°C to eliminate the internal stress of the aluminum material and completely dissolve the alloy elements in the second aluminum material into the lattice of aluminum, and then coarsening treatment is carried out to obtain the pretreated first aluminum material and the pretreated second aluminum material.

[0030] The first aluminum material is 1061Al, 1050Al, 1070Al or 1100Al; the second aluminum material is 6061Al, 6060Al, 6063Al or 6463Al.

[0031] Taking the pretreated first aluminum material as the surface layer and the pretreated second aluminum material as the core layer, stacking them in the structure of surface layer-core layer-surface layer, heating at 380°C to 420°C and performing one rolling pass, and then cooling to obtain a laminated aluminum-based composite plate.

[0032] In the above technical solution, after solution treatment and coarsening treatment, the first aluminum alloy plate and the second aluminum alloy plate with fresh surfaces are obtained, and then stacked together in a sandwich manner, and then accumulative roll bonding is carried out, effectively promoting atomic diffusion between the first aluminum alloy plate and the second aluminum alloy plate, making them interlock with each other, achieving the effect of metallurgical bonding; at the same time, hot rolling reduces the internal stress of the plate, eliminates work hardening, makes the grains undergo dynamic recovery and dynamic recrystallization, thereby refining the grains, realizing good bonding of the plate, avoiding oxidation of the bonding surface, improving the bonding property of the alloy interface and further optimizing the comprehensive performance of the material.

[0033] It should be noted that for the solution treatment temperature defined in the above solution, if the solution temperature of 6061 aluminum alloy is lower than 480 °C, the second phase in the alloy cannot be completely decomposed, and the alloying elements cannot be completely dissolved into the lattice of Al. The heating rolling at 380 °C to 420 °C is to eliminate the work hardening generated by rolling as much as possible. This temperature range is suitable for hot working and can ensure the plasticity and bonding properties of the material.

[0034] In order to further improve the performance of the composite plate, after the first rolling, a single-rolled plate is obtained, coarsening treatment is carried out, the single-rolled plate is cut and stacked, and rolled again at 380 °C to 420 °C.

[0035] In order to achieve good bonding between the layers of the multi-layer aluminum-based composite plate and straighten the rolled plate, after the second rolling, a second-rolled plate is obtained, the second-rolled plate is cut and stacked, and rolling treatment is carried out at 350 °C to 450 °C, and the rolling treatment is repeated 1 to 3 times.

[0036] In order to ensure the thickness of the multi-rolled laminated aluminum-based composite plate, the rolling rates of the first rolling and the second rolling are both 0.4 m / s, and the reduction per pass is 50%.

[0037] In order to ensure the performance of the plate after solution treatment, the time of the solution treatment is 30 min to 60 min.

[0038] In order to fully eliminate work hardening and ensure the plasticity and bonding properties of the material, the heating time is 10 min to 20 min.

[0039] In order to increase the bonding area of the bonding interface and thus improve the bonding force of the interface, the coarsening treatment is specifically: grinding with sandpaper with a mesh number ≤ 80, and then washing with ultrasonic acetone after grinding.

[0040] In order to further ensure the interface bonding force of the laminated aluminum-based plate, before coarsening treatment, the oxide film and oil stain on the aluminum material surface are removed; after coarsening treatment, the surface roughness of the plate ≥ Ra3.2.

[0041] The content of the present invention will be specifically described below through the following examples and comparative examples.

[0042] Example 1

[0043] A method for preparing a laminated aluminum-based composite sheet, comprising the following steps:

[0044] (1) Two 1060 industrial pure aluminum sheets and one 6061 aluminum alloy sheet are kept at 520 °C for 45 minutes, and then subjected to acetone cleaning and surface grinding.

[0045] (2) The 6061 aluminum alloy sheet is stacked between the two 1060 Al sheets.

[0046] (3) The stacked composite sheet with a thickness of 4.2 mm is placed in a muffle furnace at 400 °C and heated for 15 minutes, then subjected to single-pass rolling and cooled to room temperature.

[0047] (4) After single-pass rolling and welding, the sample is rolled into a 6061Al / 1060Al laminated composite material with a thickness of 2.1 mm, and its cross-sectional view is as Figure 1 shown. During the rolling process, the rolling speed and the single-pass reduction are 0.4 m / s and 50% respectively.

[0048] Example 2

[0049] A method for preparing a laminated aluminum-based composite sheet, comprising the following steps:

[0050] (1) Two 1060 industrial pure aluminum sheets and one 6061 aluminum alloy sheet are kept at 520 °C for 45 minutes, and then subjected to acetone cleaning and surface grinding.

[0051] (2) The 6061 aluminum alloy sheet is stacked between the two 1060 Al sheets.

[0052] (3) The stacked composite sheet with a thickness of 4.2 mm is placed in a muffle furnace at 400 °C and heated for 15 minutes, then subjected to single-pass rolling and cooled to room temperature.

[0053] (4) The composite sheet after the first-pass rolling is cut in half, subjected to acetone cleaning and surface grinding and roughening, stacked and fixed, and then placed in a muffle furnace at 400 °C and heated for 15 minutes for the second-pass rolling.

[0054] (5) After the second-pass rolling and welding, the sample is rolled into a 6061Al / 1060Al laminated composite material with a thickness of 2.1 mm, and its cross-sectional view is as Figure 2 shown. During the rolling process, the rolling speed and the single-pass reduction are 0.4 m / s and 50% respectively.

[0055] Example 3

[0056] A preparation method of a laminated aluminum-based composite sheet, comprising the following steps:

[0057] (1) Two pieces of 1060 industrial pure aluminum sheets and one piece of 6061 aluminum alloy sheet are kept at 520 °C for 45 minutes, and then acetone cleaning and surface grinding are carried out.

[0058] (2) The 6061 aluminum alloy sheet is stacked between the two 1060 Al sheets.

[0059] (3) The composite sheet with a thickness of 4.2 mm after stacking is put into a muffle furnace at 400 °C and heated for 15 minutes, then single-pass rolling is carried out and cooled to room temperature.

[0060] (4) The composite sheet rolled in each pass is cut in half, acetone cleaning and surface grinding and roughening are carried out, and after stacking and fixing, it is put into a muffle furnace at 400 °C and heated for 15 minutes for the second-pass rolling.

[0061] (5) Repeat step (4), after 3 passes of rolling and welding, the sample is rolled into a 6061Al / 1060Al laminated composite material with a thickness of 2.1 mm, and its cross-sectional view is as Figure 3 shown. During the rolling process, the rolling speed and the single-pass reduction are 0.4 m / s and 50% respectively.

[0062] Example 4

[0063] A preparation method of a laminated aluminum-based composite sheet, comprising the following steps:

[0064] (1) Two pieces of 1060 industrial pure aluminum sheets and one piece of 6061 aluminum alloy sheet are kept at 520 °C for 45 minutes, and then acetone cleaning and surface grinding are carried out.

[0065] (2) The 6061 aluminum alloy sheet is stacked between the two 1060 Al sheets.

[0066] (3) The composite sheet with a thickness of 4.2 mm after stacking is put into a muffle furnace at 400 °C and heated for 15 minutes, then single-pass rolling is carried out and cooled to room temperature.

[0067] (4) The composite sheet rolled in each pass is cut in half, acetone cleaning and surface grinding and roughening are carried out, and after stacking and fixing, it is put into a muffle furnace at 400 °C and heated for 15 minutes for the second-pass rolling.

[0068] (5) Repeat step (4), after 5 passes of rolling and welding, the sample is rolled into a 6061Al / 1060Al laminated composite material with a thickness of 2.1 mm, and its cross-sectional view is as Figure 4 shown. During the rolling process, the rolling speed and the single-pass reduction are 0.4 m / s and 50% respectively.

[0069] Example 5

[0070] A preparation method of a laminated aluminum-based composite plate, comprising the following steps:

[0071] (1) Two 1060 industrial pure aluminum plates and one 6061 aluminum alloy plate are heat-preserved at 520 °C for 45 minutes, and then subjected to acetone cleaning and surface grinding.

[0072] (2) Stack the 6061 aluminum alloy plate between the two 1060 Al plates.

[0073] (3) After putting the stacked composite plate with a thickness of 4.2 mm into a muffle furnace at 400 °C and heating for 15 minutes, perform single-pass rolling and cool to room temperature.

[0074] (4) Cut the composite plate rolled in each pass in the middle, perform acetone cleaning and surface grinding and roughening, stack and fix it, and then put it into a muffle furnace at 400 °C and heat for 15 minutes for the second-pass rolling.

[0075] (5) Repeat step (4), after 7 passes of rolling and welding, roll the sample into a 6061Al / 1060Al laminated composite material with a thickness of 2.1 mm, and its cross-sectional view is as Figure 5 shown. During the rolling process, the rolling speed and the single-pass reduction are 0.4 m / s and 50% respectively.

[0076] To further illustrate the effects of the present invention, the present invention also sets a comparative example, as follows:

[0077] Comparative Example 1

[0078] Compared with Example 1, the difference is that: the 1060 industrial pure aluminum plate and the 6061 aluminum alloy plate are not solution-treated.

[0079] A preparation method of a laminated aluminum-based composite plate, comprising the following steps:

[0080] (1) Perform acetone cleaning and surface grinding on two 1060 industrial pure aluminum plates and one 6061 aluminum alloy plate respectively.

[0081] (2) Stack the 6061 aluminum alloy plate between the two 1060 Al plates.

[0082] (3) After putting the stacked composite plate with a thickness of 4.2 mm into a muffle furnace at 400 °C and heating for 15 minutes, perform single-pass rolling and cool to room temperature.

[0083] (4) Single-pass rolling, same as in Example 1. Because the plates used are all in a state of large plastic deformation and unannealed, there are large internal stresses. At the same time, the 6061 aluminum alloy without solid solution treatment contains Mg2Si, β-Al5FeSi, α-Al 12 The second phase particles such as (FeMn)3Si2 make the deformation coordination of 1060 industrial pure aluminum sheet and 6061 aluminum alloy sheet poor and the interface cracked during the rolling deformation process, resulting in the deterioration of their interface bonding.

[0084] Comparative Example 2

[0085] Compared with Example 1, the difference is that the 1060 industrial pure aluminum plate and the 6061 aluminum alloy plate are not roughened.

[0086] A method for preparing a layered aluminum-based composite plate comprises the following steps:

[0087] (1) Two 1060 industrial pure aluminum plates and one 6061 aluminum alloy plate were kept at 520°C for 45 minutes and then cleaned with acetone.

[0088] (2) Stack the 6061 aluminum alloy plate between two 1060Al plates.

[0089] (3) The stacked composite sheet with a thickness of 4.2 mm was placed in a muffle furnace and heated at 400° C. for 15 minutes, then single-pass rolled and cooled to room temperature.

[0090] (4) Single-pass rolling, same as Example 1. Because the surfaces of the 1060 industrial pure aluminum plate and the 6061 aluminum alloy plate are relatively smooth without roughening treatment, they slip at the interface during rolling deformation, and the deformation coordination deteriorates, resulting in the 1060Al and 6061Al being staggered and unable to be combined together.

[0091] Comparative Example 3

[0092] Compared with Example 1, the difference is that the 1060 industrial pure aluminum plate and the 6061 aluminum alloy plate are not heated in the muffle furnace at 400° C. and kept warm for 15 minutes.

[0093] (1) Two 1060 industrial pure aluminum plates and one 6061 aluminum alloy plate were kept at 520°C for 45 minutes, and then cleaned with acetone and surface polished.

[0094] (2) Stack the 6061 aluminum alloy plate between two 1060Al plates.

[0095] (3) The stacked composite sheet with a thickness of 4.2 mm is subjected to single-pass rolling.

[0096] (4) Through single-pass rolling and welding, the same as in Example 1. Since the 1060 commercial pure aluminum sheet and the 6061 aluminum alloy sheet were not heated at 400 °C and held for 15 minutes, during the rolling process, under the action of pressure, 1060Al and 6061Al adhered together, but to achieve the effect of metallurgical bonding, the interfacial bonding performance was poor.

[0097] The properties of the laminated aluminum-based sheets provided in Examples 1 to 5 and Comparative Examples 1 to 3 above were respectively detected, and the results are shown in Table 1.

[0098] Table 1 Performance detection table of the laminated aluminum-based sheets of the examples and comparative examples of the present invention

[0099] Maximum tensile strength (MPa) Yield strength (MPa) Elongation rate (%) Example 1 103 60 12.1 Example 2 92 68 13.2 Example 3 128 114 14.3 Example 4 130 127 16.3 Example 5 139 132 17.5 Comparative example 1 / / / Comparative example 2 / / / Comparative example 3 87 53 10.4

[0100] Note: " / " indicates that it could not be measured.

[0101] As can be seen from Table 1, the laminated aluminum-based composite sheets prepared by the present invention have better mechanical properties. The maximum tensile strength of the laminated aluminum-based composite sheet obtained by the 7-pass rolling treatment in Example 5 can reach 139 MPa, the yield strength can be as high as 132 MPa, and the elongation can reach 17.5%. The present invention first performs solution treatment on the alloy sheets of the first aluminum material and the second aluminum material to eliminate the internal stress of the aluminum material and completely dissolve the alloying elements in the second aluminum material into the lattice of aluminum. Then, after roughening treatment, the first aluminum alloy sheet and the second aluminum alloy sheet with fresh surfaces are obtained, and then they are stacked together in a sandwich manner, and then accumulative roll bonding is carried out, effectively promoting atomic diffusion between the first aluminum alloy sheet and the second aluminum alloy sheet, making them interlock with each other to achieve the effect of metallurgical bonding; at the same time, the internal stress of the sheet is reduced by hot rolling, work hardening is eliminated, the grains undergo dynamic recovery and dynamic recrystallization, thereby refining the grains, realizing good bonding of the sheet, avoiding oxidation of the bonding surface, improving the bonding property of the alloy interface, and further optimizing the comprehensive performance of the material.

[0102] The mechanical properties of the laminated aluminum-based sheets obtained in Comparative Examples 1 to 3 above are not good, and the main reasons are as follows:

[0103] In Comparative Example 1, since the sheets used were all in the state of large plastic deformation without annealing, there was a large internal stress. At the same time, there were second-phase particles such as Mg2Si, β-Al5FeSi, and α-Al 12 (FeMn)3Si2 in the 6061 aluminum alloy without solution treatment, which made the deformation coordination between the 1060 commercial pure aluminum sheet and the 6061 aluminum alloy sheet poor during the rolling deformation process, the interface cracked, resulting in poor interfacial bonding.

[0104] In Comparative Example 2, since the sheet materials were not roughened, the surfaces of the 1060 commercial pure aluminum sheet and the 6061 aluminum alloy sheet were relatively smooth. During the rolling deformation process, slipping occurred at the interface, resulting in poor deformation coordination, causing the 1060Al and 6061Al to be misaligned and unable to bond together.

[0105] In Comparative Example 3, since the 1060 commercial pure aluminum sheet and the 6061 aluminum alloy sheet were not heated at 400 °C and held for 15 minutes, during the rolling process, under the action of pressure, the 1060Al and 6061Al bonded together, but the interfacial bonding performance was poor to achieve the effect of metallurgical bonding.

[0106] Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and deformations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and deformations.

Claims

1. A preparation method of a layered aluminum-based composite sheet, characterized in that, The method includes the following steps: Subject the first aluminum material and the second aluminum material to solution treatment at 480°C to 540°C for 30 min to 60 min to eliminate the internal stress in the aluminum materials and dissolve the alloying elements in the second aluminum material into the lattice of aluminum, and then perform roughening treatment to obtain the pretreated first aluminum material and the pretreated second aluminum material; the first aluminum material is 1061Al, 1050Al, 1070Al or 1100Al; the second aluminum material is 6061Al, 6060Al, 6063Al or 6463Al; Take the pretreated first aluminum material as the surface layer and the pretreated second aluminum material as the core layer, stack them according to the structure of surface layer-core layer-surface layer, heat at 380°C to 420°C for 10 min to 20 min and perform primary rolling, and then cool to obtain a laminated aluminum matrix composite sheet.

2. The preparation method of the laminated aluminum-based composite sheet according to claim 1, characterized in that After the primary rolling is completed, obtain a singly rolled sheet, perform roughening treatment, cut and stack the singly rolled sheet, and then perform rolling again at 350°C to 450°C.

3. The preparation method of the laminated aluminum-based composite sheet according to claim 2, characterized in that, After the secondary rolling is completed, obtain a doubly rolled sheet, cut and stack the doubly rolled sheet, and perform rolling treatment at 350°C to 450°C, and the rolling treatment is repeated 1 to 3 times.

4. The preparation method of the laminated aluminum-based composite sheet according to claim 3, characterized in that, The rates of the primary rolling and the secondary rolling are both 0.4 m / s, and the reduction per rolling is 50%.

5. The preparation method of the laminated aluminum-based composite sheet according to claim 1, characterized in that, The roughening treatment specifically is: polish with sandpaper having a mesh number ≤ 80, and then wash with ultrasonic acetone after polishing.

6. The preparation method of the laminated aluminum-based composite sheet according to claim 1, characterized in that, Before the roughening treatment, remove the oxide film and oil stain on the surface of the aluminum material; after the roughening treatment, the surface roughness of the sheet is ≥ Ra3.

2.

7. A laminated aluminum matrix composite sheet prepared by the preparation method of the laminated aluminum matrix composite sheet according to any one of claims 1 to 6.

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