A dual-reinforcing phase Al2O3-Al2Cu aluminum matrix composite material and its preparation method

Abstract

This invention provides an Al2O3-Al2Cu dual-strengthened aluminum matrix composite material and its preparation method, belonging to the field of metal material preparation technology. The method includes: grinding copper foil, placing it in a muffle furnace, heating it to 350℃-450℃ in air, and holding it for 2-4 hours; performing stress-relief annealing and surface cleaning on aluminum plates; laying the copper foil flat between two aluminum plates and performing a first rolling and welding process to form an aluminum matrix composite plate A; stacking at least two sets of aluminum matrix composite plates A and performing a second rolling and welding process; halving and surface cleaning, then stacking them together again for a third rolling and welding process; annealing followed by at least two cycles of cumulative rolling; and finally, high-temperature aging treatment. This invention provides a method that uses pre-oxidized copper foil as a sandwich layer, combined with cumulative rolling, to generate an in-situ (Al2O3+Al2Cu) dual-strengthened phase, solving the problems of Al2O3 coarsening and second-phase grain boundary segregation in traditional aluminum matrix materials, thereby improving the strength and toughness of the aluminum matrix composite material.

Description

Technical Field

[0001] This invention belongs to the field of metal material preparation technology, and specifically relates to an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material and its preparation method. Background Technology

[0002] With the further development of the aerospace industry, Al-based composite materials have become popular structural materials in this field due to their lightweight, high plasticity, low expansion, and high thermal conductivity. Introducing reinforcing phases with excellent intrinsic physical properties such as high strength and high elastic modulus into the Al matrix, or refining the grains to the nanoscale, can significantly improve the tensile strength, elastic modulus, and high-temperature resistance of composite materials, thus broadening their application areas.

[0003] For example, introducing CuO into Al-based materials can generate Al2Cu and Al2O3 through in-situ reactions, achieving synergistic reinforcement of the reinforcing phase and the precipitated phase. Currently, the main method for introducing CuO as a reinforcing phase into aluminum-based materials is to use methods such as cumulative rolling or hot pressing of aluminum and CuO powders to generate particulate reinforcing phases through substitution reactions.

[0004] Cumulative rolling typically employs plate-to-plate or powder-to-plate rolling. To facilitate the displacement reaction between CuO and the aluminum plate, CuO powder needs to be adhered to the surface of the copper or aluminum plate using cold or hot spraying. However, this process has the following drawbacks:

[0005] (1) A binder is required to achieve effective adhesion of CuO powder;

[0006] (2) The copper plate is too thick, which cannot achieve the effect of nano-reinforcement, and the copper content is too high, making it easy to break after multiple rolling processes.

[0007] (3) CuO powder can easily cause uneven thickness of the reinforcing phase, which affects the uniformity of material properties.

[0008] Excessive temperature or vacuum hot pressing during hot pressing sintering can lead to problems such as Al2O3 coarsening and Al2O3-A1 melt interface energy mismatch inducing second-phase grain boundary segregation. As a result, CuO-reinforced Al-based composite materials cannot simultaneously achieve high strength and fracture toughness, which affects the service life of the materials.

[0009] Therefore, solving the problems of Al2O3 coarsening and second-phase grain boundary segregation is the key to improving the overall performance of CuO-reinforced Al-based composite materials. Summary of the Invention

[0010] Therefore, the present invention aims to provide an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material and its preparation method, in order to solve at least one technical problem in the background art.

[0011] This invention is implemented as follows:

[0012] A method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material, the method comprising the following steps:

[0013] The copper foil is preheated to form a copper oxide layer on its surface;

[0014] The aluminum sheet undergoes stress-relief annealing and surface cleaning treatments, which expose fresh aluminum atoms on the surface of the aluminum sheet.

[0015] Copper foil is laid flat between two aluminum plates and rolled and welded for the first time to form aluminum-based composite plate A;

[0016] The surface of aluminum-based composite plate A is cleaned to expose highly active aluminum atoms. At least two sets of aluminum-based composite plates A are then stacked and subjected to a second rolling and welding process to form aluminum-based composite plate B.

[0017] Aluminum-based composite plate B undergoes cumulative rolling, specifically by first cutting it in half and cleaning its surface, then stacking them together, and finally rolling and welding them a third time to form aluminum-based composite plate C.

[0018] After annealing, aluminum-based composite plate C undergoes at least two cycles of cumulative rolling to form aluminum-based composite plate D, which is a nano-layered Al-CuO@Cu-Al plate.

[0019] Aluminum-based composite plate D was subjected to high-temperature aging treatment to generate Al2O3-Al2Cu dual-strength phase synergistic reinforced aluminum-based composite material.

[0020] The specific steps for the preheating treatment of copper foil are as follows:

[0021] Sanding a copper foil with a thickness of 20μm-30μm between two sheets of sandpaper removes the passivation layer on the surface of the copper foil.

[0022] The polished copper foil is placed in a muffle furnace and heated to 350℃-450℃ in air, and held for 1-4 hours to form a copper foil with a nano-CuO layer on the surface.

[0023] Furthermore, the annealing treatment after cumulative rolling is carried out at a temperature of 120℃~160℃ for 1h~2h.

[0024] Furthermore, the stress-relief annealing process specifically involves cutting an aluminum plate with a thickness of 1.5mm-2mm into a set size, annealing it at 300℃ for 2 hours, and then cooling it in the furnace to remove stress from the aluminum plate.

[0025] Furthermore, the specific operation of the surface cleaning treatment is as follows: the surface of the aluminum plate or the corresponding aluminum-based composite plate is treated with a steel brush to remove the passivation layer on the surface of the aluminum plate and expose the highly active fresh metal, forming a plate with abrasive particles on the surface.

[0026] Furthermore, the rolling deformation is 60%-65% during the first rolling and welding process; 50%-55% during the second rolling and welding process; and 45%-50% during the third rolling and welding process.

[0027] Furthermore, the total number of cumulative rolling passes is 12 to 24.

[0028] Furthermore, after 5 to 6 cumulative rolling cycles, an annealing process is performed.

[0029] Furthermore, during the second rolling and welding process, the number of aluminum-based composite plates A stacked is 2 to 5.

[0030] Furthermore, the high-temperature aging temperature is 450℃-550℃, and the time is 2h-12h.

[0031] Furthermore, when the copper foil is laid flat between the two aluminum plates, space is left around the aluminum plates.

[0032] The second aspect of the present invention provides an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material prepared by the above preparation method.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. This invention provides a method for preparing Al2O3-Al2Cu dual-strength phases by using pretreated copper foil as an interlayer and combining cumulative rolling, thereby solving the problems of Al2O3 coarsening and second-phase grain boundary segregation, and synergistically improving the strength and toughness of Al-based composite materials.

[0035] 2. In this invention, copper foil with a nano-CuO layer on its surface is wrapped in an aluminum plate and rolled together. The CuO layer, copper foil and aluminum plate deform together to construct a uniformly distributed nano-layered Al-CuO@Cu-Al plate. Combined with high-temperature aging, a finely distributed Al2O3-Al2Cu dual-strengthened phase is formed.

[0036] 3. After high-temperature aging at 450℃-550℃, the present invention still has high strength and plasticity, proving that it has high-temperature resistance and high-temperature stability. Attached Figure Description

[0037] Figure 1 The image shows the SEM image of the reinforcing phase in the aluminum-based composite material prepared in Example 1 of this invention.

[0038] Figure 2 This is a TEM image of the Al2O3-Al2Cu dual-reinforcing phase in the aluminum-based composite material prepared in Example 1 of the present invention;

[0039] Figure 3 This is a SEM image of the reinforcing phase in the aluminum-based composite material prepared using 50μm copper foil in Example 2 of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] A method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material includes steps S1 to S6.

[0042] S1. Substrate pretreatment;

[0043] In practice, a copper foil with a thickness of 20μm-30μm is sandwiched between two sheets of sandpaper and gently polished to remove the passivation layer on the surface of the copper foil, giving it a frosted texture. The polished copper foil is then placed in a muffle furnace and heated to 350℃-450℃ in air, and held at that temperature for 1-4 hours to form a copper foil with a nano-CuO layer on the surface, i.e., CuO@Cu. The sandpaper has a mesh size of 1000 to 2000.

[0044] Aluminum plates with a thickness of 1.5mm-2mm are cut to the specified size and annealed at 300℃ for 2 hours. The stress in the aluminum plate is removed by furnace cooling. The surface of the aluminum plate is then cleaned with a high-hardness 304 steel wire brush to remove the passivation layer and expose the highly active fresh aluminum atoms, forming a plate with a frosted surface.

[0045] S2, First rolling and welding

[0046] The copper foil and aluminum plate after the pretreatment in step S1 are combined into a structure similar to a "hamburger". Specifically, the copper foil is laid flat between two aluminum plates, with a certain space left around the edges (i.e., the length and width of the aluminum plate are greater than the length and width of the copper foil). Then, the first rolling and welding is performed. When the rolling deformation is 55%-65%, Al-CuO@Cu-Al can achieve effective metallurgical bonding to form an aluminum-based composite plate A with 3 layers.

[0047] S3, Second rolling and welding;

[0048] At least two sets of aluminum-based composite plates A are cut to the same size, and then surface-cleaned to expose highly active aluminum atoms (the same as the surface cleaning process for aluminum plates in step S1). Then, the sets of aluminum-based composite plates A are stacked and subjected to a second rolling and welding process. When the rolling deformation is 50%-55%, the second rolling process ends, forming an aluminum-based composite plate B, which is an Al-CuO@Cu-Al plate containing 2-5 CuO@Cu layers. In specific implementation, the number of aluminum-based composite plates A stacked m is preferably 2 to 5 sets, and the number of layers is 3×m layers.

[0049] S4, Third rolling and welding;

[0050] First, cut the aluminum-based composite plate B in half and clean its surface (the same as the aluminum plate surface cleaning process in step S1). Then, stack them together and perform a third rolling and welding process. When the rolling deformation is 45%-50%, the third rolling process ends, forming the aluminum-based composite plate C, which has 2×3×m layers.

[0051] S5, cyclic cumulative rolling;

[0052] The C-annealing treatment of aluminum-based composite panels softens Al.

[0053] The cyclical steps S4, including halving, surface cleaning, stacking, and rolling welding, form an aluminum-based composite plate D, which is a nano-layered Al-CuO@Cu-Al plate.

[0054] In this step, the number of cumulative rolling cycles is increased, and the number of layers N inside the sheet increases exponentially. The corresponding single-layer thickness decreases rapidly to the nanoscale in an exponential manner. After cyclic cumulative rolling, the total number of layers N of the sheet is N = 3 × m × 2. n+1 m is the number of aluminum-based composite plates A stacked in step S3, and n is the cumulative number of stacking cycles in step S5, n=12~24;

[0055] In practice, after accumulating 5 to 6 rolling passes, an annealing treatment is performed. The reason is that after a certain number of rolling passes, the hardness of the sheet increases, so annealing is performed to soften the sheet. The annealing temperature is 120℃ to 160℃ and the time is 1 to 2 hours.

[0056] S6. High-temperature aging treatment;

[0057] The aluminum-based composite plate D is subjected to high-temperature aging treatment at 450℃~550℃ for 2h-12h (preferably 2h-6h) to allow the CuO@Cu film sandwiched in the nano-Al layer to react with Al to form a diffusely distributed Al2O3 reinforcing phase. At the same time, Cu reacts with Al to form an Al2Cu reinforcing phase, ultimately generating an Al2O3-Al2Cu dual-reinforcing phase synergistically reinforced aluminum-based composite material, which has the characteristics of both strength and toughness and high temperature resistance.

[0058] This invention utilizes repeated rolling of copper foil with a nano-CuO layer on its surface, wrapped around an Al plate. The uniformly loaded copper oxide on the copper foil deforms in tandem with the Al plate during rolling, ensuring a uniform distribution of CuO within the matrix. This constructs a uniformly distributed nanolayered Al-CuO@Cu-Al substrate. Further aging allows the copper foil, sandwiched within the Al plate and possessing a thin CuO layer, to react in situ with the Al matrix, generating uniformly dispersed fine Al₂O₃ and Al₂Cu reinforcing phases. This solid-state reaction, occurring at low temperatures, effectively addresses the coarsening of the Al₂O₃ reinforcing phase, ultimately improving the overall material performance. Specific examples of this invention demonstrate that the material design and preparation process are entirely feasible, cost-effective, and result in significant performance improvements.

[0059] Example 1

[0060] A method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material includes the following steps:

[0061] S1. Cut a 20μm thick copper foil into 25mm*35mm pieces. Cut 1000-grit sandpaper into 30mm*40mm pieces. Sand the copper foil between two pieces of sandpaper and gently polish it to remove the passivation layer on the surface of the copper foil until the surface of the copper foil has a frosted texture. Place the polished copper foil in a muffle furnace for heat treatment. Heat it to 400℃ in air and hold it for 3 hours to form a copper foil with a nano-CuO layer on the surface. Cut a 1.7mm thick aluminum plate into 30mm*40mm pieces and anneal it at 300℃ for 2 hours. Cool it in the furnace to remove the stress in the aluminum plate. Then clean the surface of the aluminum plate with a high-hardness 304 steel wire brush to remove the passivation layer on the surface of the aluminum plate and expose the highly active fresh metal aluminum atoms to form an aluminum plate with frosted particles on the surface.

[0062] S2. The copper foil treated in S1 is laid flat between two aluminum plates treated in S1 and rolled and welded for the first time. When the rolling deformation is 60%, the rolling is stopped to form aluminum-based composite plate A, which is an Al-CuO@Cu-Al alloy.

[0063] S3. Cut the three sets of aluminum-based composite plates A into the same size, clean the surface of aluminum-based composite plates A with a steel brush to expose highly active aluminum atoms, and then stack the aluminum-based composite plates A neatly and perform a second rolling and welding. Stop when the rolling deformation is 55% to form an Al-CuO@Cu-Al plate containing three CuO@Cu layers, denoted as aluminum-based composite plate B.

[0064] S4. First, cut the aluminum-based composite plate B in half. Use a steel brush to clean the surface of the aluminum-based composite plate B to expose the highly active aluminum atoms. Then, stack the two together and perform a third rolling and welding process. Stop when the rolling deformation is 45% to form the aluminum-based composite plate C.

[0065] S5. The aluminum-based composite plate C is annealed at 150°C for 1 hour to soften Al; the halving, surface cleaning, stacking and rolling welding of step S4 are repeated 24 times to form the aluminum-based composite plate D; and the annealing process is repeated once after every 5 to 6 cumulative stacking and rolling.

[0066] S6. The aluminum-based composite plate D is subjected to high-temperature aging treatment at 540℃ for 6 hours, so that the CuO@Cu film sandwiched in the nano-Al layer reacts with Al to form a diffusely distributed Al2O3 reinforcing phase. At the same time, Cu reacts with Al to form an Al2Cu reinforcing phase, thus forming an Al2O3-Al2Cu dual reinforcing phase, and finally generating an aluminum-based composite material with Al2O3-Al2Cu dual reinforcing phase synergistic reinforcement.

[0067] The aluminum-based composite material prepared in this embodiment was subjected to a room temperature quasi-static tensile test in accordance with GB / T228.1-2010 standard to measure its tensile strength and elongation after fracture, and to determine the strength and plasticity of the aluminum-based composite material.

[0068] The reinforcing phase in the aluminum-based composite material prepared in this embodiment was observed under microscopic conditions, and its SEM image is shown below. Figure 1 As shown, its TEM image is as follows Figure 2 As shown. By Figure 1 and Figure 2 It can be seen that the strengthening phase is distributed in layers and appears as fine lines.

[0069] Example 2

[0070] This embodiment is a method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material. Based on Example 1, the copper foil thickness in step S1 is adjusted to 10μm, 30μm, 40μm, and 50μm, respectively, and is referred to as Example 2-1, Example 2-2, Example 2-3, and Example 2-4, respectively, while other reaction conditions remain unchanged.

[0071] Each variable experiment of Example 1 and this example was repeated 3 times, and the mechanical properties and microscopic results of the reinforcing phase were measured and compared. The comparison results are shown in Table 1.

[0072] Table 1

[0073]

[0074] Examples 1, 2-1 to 2-4 compare the effects of different copper foil thicknesses on the morphology of the reinforcing phase and the properties of the final product. As shown in Table 1, as the thickness increases, the strength increases while the plasticity gradually decreases. This is because the coarsening of the reinforcing phase leads to a decrease in work hardening capacity and a decrease in the elongation of the sheet. However, with a copper foil thickness of 20μm to 30μm, the final aluminum-based composite material maintains a strength of over 350MPa and a plasticity of over 30%. Therefore, the preferred copper foil thickness is 20μm to 30μm.

[0075] The reinforcing phase in the aluminum-based composite material prepared from 50 μm copper foil in this embodiment was observed under microscopic conditions, and its SEM image is shown below. Figure 3 As shown. By Figure 3 It can be seen that the reinforcing phase is in the form of coarse-grained dispersion.

[0076] Example 3

[0077] This embodiment is a method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material. Based on Example 1, the copper foil pretreatment process in step S1 is adjusted and referred to as Examples 3-1 to 3-11 respectively. Other reaction conditions remain unchanged. The performance of the aluminum matrix composite material finally obtained under different pretreatment conditions is compared.

[0078] Each variable experiment of Example 1 and this example was repeated 3 times, and the mechanical properties and microscopic results of the reinforcing phase were measured and compared. The comparison results are shown in Table 2.

[0079] Table 2

[0080]

[0081] Examples 1, 3-1 to 3-4 compare the effects of copper foil pretreatment at different temperatures on the morphology of the reinforcing phase and the properties of the final product. As shown in Table 2, the material strength gradually increases with increasing temperature because the copper foil oxide layer thickens, resulting in more Al2O3 reinforcing phase. However, when the temperature increases to above 500℃, the copper foil turns to ash. Therefore, the preferred heat treatment temperature for copper foil is 350℃~450℃. Within this range, the aluminum-based composite material obtained maintains a strength of over 310 MPa and a plasticity of over 30%.

[0082] Examples 1, 3-5 to 3-8 compare the effects of different heat treatment times on the morphology of the reinforcing phase and the properties of the final product. As shown in Table 2, the strength of the aluminum-based composite material gradually increases and the plasticity gradually decreases with increasing time. This is because the oxide layer formed by the copper foil is too thick, resulting in a coarse reinforcing phase after reacting with the Al plate. The study found that the optimal heat treatment time for the copper foil is 1h to 4h, and more preferably 2h to 3h. Within this range, the final aluminum-based composite material maintains a strength of over 310 MPa and a plasticity of over 30%.

[0083] Examples 1, 3-9 and 3-11 were compared to see the effects of polishing and heat treatment on the morphology of the reinforcing phase and the performance of the final product. As shown in Table 2, after removing polishing and / or heat treatment, the strength and toughness of the final aluminum-based composite material were significantly reduced compared to Example 1. The reasons are as follows: (1) During storage, a passivation film will form on the surface of the copper foil. If it is directly oxidized without polishing, the required heat treatment temperature will increase significantly. The oxidation effect is not good in the range of 350℃~450℃. When the oxidation temperature is further increased, the copper foil will be oxidized into ash and the effect of forming copper oxide on the surface cannot be achieved. (2) The purpose of heat treatment is to react copper with oxygen in the air to generate copper oxide. If high-temperature oxidation is not carried out, the subsequent reinforcing phase will only contain Al2Cu and no Al2O3.

[0084] Example 4

[0085] This embodiment is a method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material. Based on Example 1, the rolling deformation amount of rolling and welding in steps S2 to S5 is adjusted and recorded as Examples 4-1 to 4-8 respectively. Other reaction conditions remain unchanged. The performance of the final aluminum matrix composite material under different rolling deformation amounts is compared.

[0086] Each variable experiment of Example 1 and this example was repeated 3 times, and the mechanical properties and microscopic results of the reinforcing phase were measured and compared. The comparison results are shown in Table 3.

[0087] Table 3

[0088]

[0089] Examples 1, 4-1 to 4-3 compare the effects of different first rolling deformation amounts on the morphology of the reinforcing phase and the properties of the final product. Table 3 shows that when the first rolling deformation amount is too small (50%), stratification occurs after rolling. As the first rolling deformation amount further increases, the strength and plasticity of the material are synergistically improved because of better interfacial bonding and enhanced reinforcement effect. Therefore, the preferred first rolling deformation amount is 55%~65%, preferably 60%~65%.

[0090] Examples 1, 4-4, and 4-5 compare the effects of different second rolling deformation amounts on the morphology of the reinforcing phase and the properties of the final product. Table 3 shows that when the second rolling deformation amount is too small (50%), the interface bonding after stacking is poor, resulting in overall delamination. As the second rolling deformation amount further increases, the sample cracks during rolling. This is because excessive reduction releases heat energy during deformation, and the formation of the reinforcing phase during deformation causes segregation and cracking. Therefore, the preferred second rolling deformation amount is 50%~55%.

[0091] Examples 1, 4-6 to 4-8 compare the effects of different third rolling deformation amounts on the morphology of the reinforcing phase and the properties of the final product. Table 3 shows that when the third rolling deformation amount is too small (40%), the interfacial bonding is poor, resulting in overall delamination. As the third rolling deformation amount further increases, the interfacial bonding effect is good, but if it is too large, the sample will also crack. This is because excessive reduction releases heat energy during deformation, and the formation of the reinforcing phase during deformation causes segregation and cracking of the reinforcing phase. Therefore, the preferred third rolling deformation amount is 45%~50%.

[0092] Example 5

[0093] This embodiment is a method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material. Based on Example 1, the number of cumulative rolling cycles in step S5 is adjusted and referred to as Example 5-1 to Example 5-5 respectively. Other reaction conditions remain unchanged. The performance of the final aluminum matrix composite material under different number of rolling cycles is compared.

[0094] Each variable experiment of Example 1 and this example was repeated 3 times, and the mechanical properties and microscopic results of the reinforcing phase were measured and compared. The comparison results are shown in Table 4.

[0095] Table 4

[0096]

[0097] Examples 1, 5-1 to 5-5 compare the effects of different cycle passes on the morphology of the strengthening phase and the properties of the final product. As shown in Table 4, the material strength gradually increases with the increase of cycle passes. This is because the material grains gradually become finer and the strengthening effect gradually improves with the increase of cycle passes. However, when the number of cycle passes increases to 26, the layered structure is destroyed and the plasticity decreases sharply. Therefore, the preferred number of cycle passes is 12 to 24.

[0098] Example 6

[0099] This embodiment is a method for preparing an Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material. Based on Example 1, the high-temperature aging treatment temperature and time in step S6 are adjusted and referred to as Examples 6-1 to 6-8 respectively. Other reaction conditions remain unchanged. The performance of the aluminum matrix composite material finally obtained under different high-temperature aging treatments is compared.

[0100] Each variable experiment of Example 1 and this example was repeated 3 times, and the mechanical properties and microscopic results of the reinforcing phase were measured and compared. The comparison results are shown in Table 5.

[0101] Table 5

[0102]

[0103] Examples 1, 6-1 to 6-8 compare the effects of different high-temperature aging treatments on the morphology of the reinforcing phase and the properties of the final product. Table 5 shows that as the aging time increases, the strength and plasticity of the resulting aluminum-based composite material increase. After 6 hours, the strength and plasticity no longer increase and even decrease slightly. Therefore, the high-temperature aging time is 2-12 hours, preferably 2-6 hours. As the high-temperature aging temperature increases, the strength and plasticity of the resulting aluminum-based composite material first increase and then decrease simultaneously. Especially when the temperature rises above 550℃, the reinforcing phase coarsens, and the reinforcing effect decreases. Therefore, the high-temperature aging temperature is set to 500℃-550℃.

[0104] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material, characterized in that, The preparation method includes the following steps: The copper foil is preheated to form a copper oxide layer on its surface; The aluminum sheet undergoes stress-relief annealing and surface cleaning treatments, which expose fresh aluminum atoms on the surface of the aluminum sheet. Copper foil is laid flat between two aluminum plates and rolled and welded for the first time to form aluminum-based composite plate A; The surface of aluminum-based composite plate A is cleaned to expose highly active aluminum atoms. At least two sets of aluminum-based composite plates A are then stacked and subjected to a second rolling and welding process to form aluminum-based composite plate B. Aluminum-based composite plate B undergoes cumulative rolling, specifically by first cutting it in half and cleaning its surface, then stacking them together, and finally rolling and welding them a third time to form aluminum-based composite plate C. After annealing, aluminum-based composite plate C undergoes at least two cycles of cumulative rolling to form aluminum-based composite plate D, which is a nano-layered Al-CuO@Cu-Al plate. Aluminum-based composite plate D was subjected to high-temperature aging treatment to generate an aluminum-based composite material with Al2O3-Al2Cu dual-strengthening phase synergistic reinforcement. The specific steps for the preheating treatment of copper foil are as follows: Sanding a copper foil with a thickness of 20μm-30μm between two sheets of sandpaper removes the passivation layer on the surface of the copper foil. The polished copper foil is placed in a muffle furnace and heated to 350℃-450℃ in air, and held for 1-4 hours to form a copper foil with a nano-CuO layer on the surface.

2. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, The annealing treatment after cumulative rolling is performed at a temperature of 120℃~160℃ for 1h~2h.

3. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, The specific operation of the stress-relief annealing treatment of the aluminum plate is as follows: cut the aluminum plate with a thickness of 1.5mm-2mm to the set size, anneal at 300℃ for 2 hours, and remove the stress in the aluminum plate by furnace cooling; the specific operation of the surface cleaning treatment is as follows: the surface of the aluminum plate or the corresponding aluminum-based composite plate is treated with a steel brush to remove the passivation layer on the surface of the aluminum plate and expose the highly active fresh metal, forming a plate with frosted particles on the surface.

4. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, The rolling deformation is 60%-65% during the first rolling and welding; 50%-55% during the second rolling and welding; and 45%-50% during the third rolling and welding.

5. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, The total number of cumulative rolling passes is 12 to 24.

6. A method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1 or 5, characterized in that, After 5 to 6 cumulative rolling cycles, an annealing treatment is performed at 120°C to 160°C for 1 to 2 hours.

7. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, During the second rolling and welding process, the number of aluminum-based composite plates A stacked is 2 to 5.

8. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, The high-temperature aging temperature is 450℃-550℃, and the time is 2h-12h.

9. The method for preparing an Al2O3-Al2Cu dual-reinforcing phase synergistic reinforced aluminum matrix composite material according to claim 1, characterized in that, When the copper foil is laid flat between two aluminum plates, space is left around the aluminum plates.

10. An Al2O3-Al2Cu dual-strengthened phase synergistic reinforced aluminum matrix composite material prepared by the preparation method according to any one of claims 1 to 9.

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