A method for the production of an alumina reinforced aluminium matrix composite by accumulative roll bonding

Abstract

The application discloses a method for preparing an aluminum oxide reinforced aluminum matrix composite material through self-oxidation and accumulative roll bonding, and belongs to the technical field of aluminum matrix composite material preparation. The method comprises the following steps: taking an aluminum plate, heating the aluminum plate in an oxygen-containing atmosphere to form an aluminum oxide layer, and obtaining an oxidized aluminum plate 1; taking two pieces of the oxidized aluminum plate 1, stacking the two pieces together to form a blank, and rolling the blank by using a two-roller rolling mill with upper and lower rollers being cross-corrugated rollers to obtain a composite plate 1; cutting the composite plate 1 along the transverse direction, heating the composite plate 1 in an oxygen-containing atmosphere to form an aluminum oxide layer, and rolling the composite plate 1 through accumulative roll bonding and by using a two-roller rolling mill with upper and lower rollers being flat rollers to obtain a metal composite plate, and then annealing the metal composite plate to obtain the aluminum oxide reinforced aluminum matrix composite plate. After multi-pass rolling, the aluminum oxide strengthening phase is uniformly distributed in the aluminum matrix composite material, and the comprehensive performance of the aluminum matrix composite material is ensured.

Description

Technical Field

[0001] This invention relates to the field of aluminum-based composite material preparation technology, and in particular to a method for preparing alumina-reinforced aluminum-based composite materials by self-oxidation cumulative rolling. Background Technology

[0002] Aluminum-based composite materials are a new type of material with strong vitality, which emerged to meet the needs of modern scientific development. They possess advantages such as light weight, good toughness, low coefficient of thermal expansion, high strength, and strong wear resistance, making them a structural material with excellent comprehensive performance. They are widely used in aerospace, transportation, electrical and electronic fields.

[0003] Aluminum-based composite materials are mainly prepared by composite processes using aluminum or aluminum alloys as the matrix and particles such as SiC, Al2O3, and graphite as reinforcements. Among these, alumina particles have better interfacial bonding performance with the aluminum matrix compared to other reinforcements. Alumina-reinforced aluminum-based composite materials not only have properties such as high temperature resistance and wear resistance, but also have high specific stiffness and specific strength, making them of great research value.

[0004] Currently, there are many methods for preparing alumina-reinforced aluminum matrix composites. Based on the state of the matrix material and the reinforcing phase during composite formation, these methods can be categorized into liquid casting, spray deposition, and powder metallurgy. Liquid casting involves uniformly mixing nano-alumina particles with molten aluminum through stirring or other methods, followed by casting and solidification. This method offers flexibility, high production efficiency, and low cost; however, it is difficult to control the process, and agglomeration is prone to occur during the addition of the reinforcing agent, leading to problems such as reinforcing agent segregation, uneven mixing, and coarse microstructure. Furthermore, liquid casting is susceptible to defects such as porosity and cracks, affecting the composite's performance. Spray deposition involves atomizing molten aluminum through high-speed spraying, mixing it with nano-alumina particles, and then spraying it onto a preheated substrate for rapid solidification. However, due to limitations in material density and production cost, this method is mostly used to prepare thin film materials with thicknesses on the order of millimeters. Powder metallurgy is a method for preparing aluminum-based composite materials by mixing and pre-pressing aluminum powder and alumina, followed by sintering, rolling, and annealing. This method is currently the most commonly used method for preparing aluminum-based composite materials due to its advantages such as relatively uniform distribution of the reinforcing phase and controllable volume fraction. However, its preparation process is complex, the materials are susceptible to contamination, and the production cycle is long, which limits the performance and applications of the prepared aluminum-based composite materials. In summary, the difficulty in preparing alumina particle-reinforced aluminum-based composite materials lies in achieving uniform dispersion of the reinforcing phase. Therefore, further research is urgently needed to achieve efficient preparation of aluminum-based composite materials with controllable alumina particle distribution. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing alumina-reinforced aluminum matrix composites through self-oxidation cumulative rolling, thereby solving the aforementioned problems in the background art. This invention employs aluminum plate self-oxidation technology, using aluminum plate as raw material. By controlling the heating temperature, heating time, and rolling process, the alumina reinforcing phase is prepared. It eliminates the need for alumina as an initial material, reducing production costs and improving product performance. The preparation process of this invention is simple, requires minimal equipment, and enables large-scale, continuous production. After multiple rolling passes, the alumina reinforcing phase is uniformly distributed throughout the aluminum matrix composite, ensuring the comprehensive performance of the aluminum matrix composite.

[0006] To achieve the above objectives, the present invention provides the following technical solution: One of the technical solutions of this invention is to provide a method for preparing alumina-reinforced aluminum matrix composites by self-oxidation rolling, comprising the following steps: (1) Take an aluminum plate, remove the oil and oxide film from the surface and roughen it. Heat it in an oxygen-containing atmosphere to form an aluminum oxide layer with a thickness of 0.1~1μm on the surface of the aluminum plate, and obtain the first oxide layer aluminum plate. Two aluminum plates with the first oxide layer are stacked together to form a preform. The preform is rolled using a two-roll mill with cross-corrugated upper and lower rolls. After straightening and trimming, the first composite plate is obtained. (2) Cut the first composite plate in the transverse direction to obtain two first composite plate sub-plates of the same size; remove the oil and oxide film from the surface of the first composite plate sub-plate and roughen it, then heat it in an oxygen-containing atmosphere to form an aluminum oxide layer of 0.1~1μm thickness on the surface of the aluminum plate to obtain the second oxide layer aluminum plate. The two aluminum plates with the second oxide layer are stacked together to form a preform, which is rolled using a two-roll mill with cross-corrugated upper and lower rolls. After straightening, trimming, and cutting off the head and tail, the second composite plate is prepared. (3) Repeat step (2) n times to obtain the (n+2)th composite plate; (4) Cut the n+2 composite plate in the transverse direction to obtain two n+2 composite plate sub-plates of the same size; remove the oil and oxide film from the surface of the n+2 composite plate sub-plates and roughen them, then heat them in an oxygen-containing atmosphere to form an aluminum oxide layer of 0.1~1μm thickness on the surface of the aluminum plate, to obtain the n+3 oxide layer aluminum plate. The two aluminum plates with the n+3 oxide layer are stacked together to form a preform, which is rolled using a two-roll mill with flat upper and lower rolls. After straightening, trimming, and removing the head and tail, a metal composite plate is prepared. (5) Annealing, straightening and trimming are performed on the metal composite plate to obtain the alumina-reinforced aluminum-based composite plate.

[0007] Preferably, n is an integer ≥ 1.

[0008] Preferably, the aluminum plate is made of industrial pure aluminum, 3-series aluminum alloy, 4-series aluminum alloy, 6-series aluminum alloy, or 7-series aluminum alloy; the thickness of the aluminum plate is 2~10mm.

[0009] Preferably, in steps (1), (2), and (3), the heating temperature is 70% to 90% of the melting point of the aluminum plate.

[0010] Preferably, in steps (1) and (2), the surface of the cross-corrugated roller is a curved surface formed by the intersection of transverse corrugations and longitudinal corrugations, and the corrugation curve is a sine curve, a cosine curve or a parabola; the wavelength of the corrugation curve is ≤8mm and the amplitude is ≤1mm.

[0011] Preferably, in steps (1), (2), and (3), the rolling reduction rate is 50% to 70%.

[0012] The second technical solution of the present invention provides an alumina-reinforced aluminum-based composite material prepared by the above method.

[0013] The beneficial technical effects of the present invention are as follows: This invention employs a cumulative rolling technique, utilizing interlaced corrugated rolls to induce uneven deformation of the slab in the thickness direction. This creates uneven forces at the interface to be laminated, promoting tearing and oxide layer breakage. Consequently, the broken alumina particles are redistributed around the interface, resulting in alumina particle reinforcement in the surrounding region. Simultaneously, the exposure of fresh metal at the interface facilitates effective bonding. Furthermore, multi-pass interlaced corrugated roll rolling promotes a more uniform distribution of alumina particles in the thickness direction of the aluminum plate.

[0014] This invention utilizes the cross-corrugated texture of the rolling mill rolls to control the distribution of alumina formation. During the high-temperature heating process to form the alumina layer, the uneven texture of the cross-corrugated surface of the composite plate not only increases the surface area for the oxidation reaction but also effectively promotes the uniform distribution and growth of alumina by guiding the growth direction of the alumina crystals. Furthermore, by adjusting the rolling reduction rate and the number of rolling passes, the alumina content in the alumina-reinforced aluminum matrix composite material can be predicted and controlled.

[0015] This invention employs aluminum plate self-oxidation technology, using aluminum plates as raw materials. By controlling the heating temperature, heating time, and rolling process, the alumina reinforcing phase is prepared. It eliminates the need for alumina as an initial material, minimizes material loss throughout the process, and achieves relatively high raw material utilization, reducing production costs and improving product performance. Furthermore, compared to traditional powder metallurgy, liquid casting, and other aluminum-based composite material preparation technologies, this invention avoids complex steps such as powder mixing, molding, and sintering, simplifying the overall preparation process. Moreover, the cumulative rolling process can be implemented using relatively simple traditional rolling equipment, which is more economical in terms of cost and maintenance, enabling large-scale, continuous production. After multiple rolling passes, the alumina reinforcing phase is uniformly distributed throughout the aluminum-based composite material, ensuring its comprehensive properties, including toughness, strength, corrosion resistance, and wear resistance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the process for preparing alumina-reinforced aluminum matrix composites by self-oxidation cumulative rolling in Examples 1-3 of the present invention.

[0018] Figure 1 In the middle, aluminum plate A—(1), aluminum plate B—(2), grinding device—(3), heating furnace—(4), upper cross corrugated roller—(5), lower cross corrugated roller—(6), upper flat roller—(7), lower flat roller—(8), corrugated metal composite plate (A / B) 1—(9), metal composite plate (A / B) 1 1—(10), metal composite plate (A / B) 2 1—(11), corrugated metal composite plate (A / B) n-2 —(12)Metal composite plate (A / B)1 n-2—(13)Metal composite plate (A / B)2 n-2—(14)Corrugated metal composite plate (A / B) n-1 —(15)Metal composite plate (A / B)1 n-1—(16)Metal composite plate (A / B)2 n-1—(17)Metal composite plate (A / B) n —(18) Detailed Implementation

[0019] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.

[0020] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0021] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this invention.

[0022] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.

[0023] In the following embodiments of the present invention, the melting point of industrial pure aluminum is 660°C, the melting point of 6061 aluminum alloy is 610°C, and the melting point of 7075 aluminum alloy is 525°C.

[0024] All raw materials used in the following embodiments of the present invention are commercially available products.

[0025] Example 1 A method for preparing alumina-reinforced aluminum matrix composites by self-oxidation cumulative rolling includes the following steps: S1, Material preparation: Prepare 1060 aluminum plate A (1) with a length × width × height of 250mm × 100mm × 2mm and material of industrial pure aluminum, and prepare 1060 aluminum plate B (2) with a length × width × height of 250mm × 100mm × 2mm and material of industrial pure aluminum. Remove the oil and oxide film from the surface of aluminum plate A (1) and aluminum plate B (2), and then roughen the surfaces of aluminum plate A (1) and aluminum plate B (2) to be laminated. S2, surface self-oxidation heating: The aluminum plate A (1) and aluminum plate B (2) obtained in step S1 are heated to 550°C in a heating furnace (4) without oxygen protection measures, so that an aluminum oxide layer of 0.1μm thickness is formed on the surface of aluminum plate A (1) and aluminum plate B (2). S3, Preparation of corrugated metal composite plate (A / B)1: The aluminum plates heated in step S2 are stacked together with aluminum plate A (1) on the bottom and aluminum plate B (2) on the top, and the surfaces to be composited are in contact to form a preform. The preform is rolled with a rolling reduction rate of 50% using a two-roll mill composed of upper cross corrugated rolls (5) and lower cross corrugated rolls (6). After straightening, trimming, and cutting off the head and tail, corrugated metal composite plate (A / B)1 (9) is prepared. S4, Prepare corrugated metal composite plate (A / B) 2: Cut the corrugated metal composite plate (A / B) 1 (9) prepared in step S3 into two metal composite plates (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) of the same size in the transverse center; Remove the oil and oxide film from the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) and roughen it by grinding (this grinding removes the oil and oxide film, which is beneficial for subsequent plate composite and does not affect the morphology of the knurling of the composite plate after rolling), and then heat it to 550°C in a heating furnace (4) without oxygen protection measures so that a 0.1μm thick aluminum oxide layer is formed on the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11); then take metal composite plate (A / B) 1 1 (10) on the bottom and 2 (11) on the top of the metal composite plate (A / B) are stacked together and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 50% using a two-roll mill consisting of an upper cross corrugated roll (5) and a lower cross corrugated roll (6). After straightening, trimming, and cutting off the head and tail, the corrugated metal composite plate (A / B) 2 is prepared. S5, repeat step S4 until the corrugated metal composite plate (A / B)4 (15) is prepared. S6, Preparation of metal composite plate (A / B) 5: The corrugated metal composite plate (A / B) 4 (15) is cut transversely to obtain two metal composite plates (A / B) 1 4 (16) and metal composite plate (A / B) 2 4 (17) of the same size; the oil and oxide film on the surface of metal composite plate (A / B) 1 4 (16) and metal composite plate (A / B) 2 4 (17) are removed and roughened by grinding, and then heated to 550°C in a heating furnace (4) without oxygen protection measures, so that a 0.1μm thick aluminum oxide layer is formed on the surface of metal composite plate (A / B) 1 4 (16) and metal composite plate (A / B) 2 4 (17); then metal composite plate (A / B) 1 4 (16) is placed below and metal composite plate (A / B) 2 4 (17) is placed below. 4 (17) are stacked together in the above manner and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 50% using a two-roll mill consisting of an upper flat roll (7) and a lower flat roll (8). After straightening, trimming, and cutting off the head and tail, a metal composite plate (A / B) 5 (18) is prepared. S7. The metal composite plate (A / B)5 (18) prepared in step S6 is uniformly annealed at 380℃ for 1.5h, then air-cooled, and finally straightened and trimmed to obtain an alumina-reinforced aluminum-based composite plate.

[0026] The surface of the cross-corrugated roller used in Example 1 is a curved surface formed by the intersection of transverse and longitudinal corrugations. The corrugation curve is a sine curve with a wavelength of 3.14 mm and an amplitude of 0.2 mm.

[0027] Comparative Example 1 The only difference from Example 1 is that the heating furnace without oxygen protection measures is modified into a vacuum heating furnace.

[0028] The alumina-reinforced aluminum matrix composite material prepared in Example 1 was sampled and subjected to tensile testing in accordance with the relevant provisions of GB / T 6396-2008. The tensile strength was found to be as high as 170 MPa, which is about 25 MPa higher than that of the 1060 aluminum plate rolled without surface oxidation treatment (Comparative Example 1), demonstrating the good mechanical properties of the alumina-reinforced aluminum matrix composite material.

[0029] Example 2 A method for preparing alumina-reinforced aluminum matrix composites by self-oxidation cumulative rolling includes the following steps: S1, Material preparation: Prepare aluminum plate A (1) with a length × width × height of 280mm × 120mm × 6mm and material of 6061 aluminum alloy, and aluminum plate B (2) with a length × width × height of 280mm × 120mm × 6mm and material of 6061 aluminum alloy. Remove oil and oxide film from the surface of aluminum plate A (1) and aluminum plate B, and then roughen the surfaces of aluminum plate A (1) and aluminum plate B (2) to be laminated for later use. S2, surface self-oxidation heating: The aluminum plate A (1) and aluminum plate B (2) obtained in step S1 are heated to 470°C in a heating furnace (4) without oxygen protection measures, so that an aluminum oxide layer of 0.5μm thickness is formed on the surface of aluminum plate A (1) and aluminum plate B (2). S3, Preparation of corrugated metal composite plate (A / B)1: The aluminum plates heated in step S2 are stacked together with aluminum plate A (1) on the bottom and aluminum plate B (2) on the top, and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 60% using a two-roll mill consisting of upper cross corrugated rolls (5) and lower cross corrugated rolls (6). After straightening, trimming, and cutting off the head and tail, corrugated metal composite plate (A / B)1 (9) is prepared. S4, Prepare corrugated metal composite plate (A / B) 2: Cut the corrugated metal composite plate (A / B) 1 (9) prepared in step S3 into two metal composite plates (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) of the same size by transverse centering; Remove the oil and oxide film from the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) and roughen them by grinding; Then heat to 470°C in a heating furnace (4) without oxygen protection measures so that a 0.5μm thick aluminum oxide layer is formed on the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11); Then place metal composite plate (A / B) 1 1 (10) below and metal composite plate (A / B) 2 1 (11) below. 1(11) The composite panels are stacked together in the above manner and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 60% using a two-roll mill consisting of an upper cross-corrugated roll (5) and a lower cross-corrugated roll (6). After straightening, trimming, and cutting off the head and tail, a corrugated metal composite plate (A / B)2 is prepared. S5, repeat step S4 until the corrugated metal composite plate (A / B)9 (15) is prepared. S6, Prepare metal composite plate (A / B) 10 : Cut the corrugated metal composite plate (A / B) 9 (15) transversely to obtain two metal composite plates (A / B) 1 9 (16) and metal composite plate (A / B) 2 9 (17) of the same size; remove the oil and oxide film from the surface of metal composite plate (A / B) 1 9 (16) and metal composite plate (A / B) 2 9 (17) and roughen them; then heat them to 470°C in a heating furnace (4) without oxygen protection measures, so that a 0.5μm thick aluminum oxide layer is formed on the surface of metal composite plate (A / B) 1 9 (16) and metal composite plate (A / B) 2 9 (17); then place metal composite plate (A / B) 1 9 (16) below and metal composite plate (A / B) 2 9 (17) below. 9 (17) are stacked together in the above manner and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 60% using a two-roll mill consisting of an upper flat roll (7) and a lower flat roll (8). After straightening, trimming, and head and tail trimming, a metal composite plate (A / B) is prepared. 10 (18); S7, Take the metal composite plate (A / B) prepared in step S6. 10 (18) The aluminum oxide reinforced aluminum-based composite plate was annealed at 550℃ for 2 hours, followed by quenching and low-temperature aging treatment, and finally straightened and trimmed to obtain the alumina reinforced aluminum-based composite plate.

[0030] The surface of the cross-corrugated roller used in Example 2 is a curved surface formed by the intersection of transverse and longitudinal corrugations. The corrugation curve is a cosine curve with a wavelength of 6.28 mm and an amplitude of 0.5 mm.

[0031] Example 3 A method for preparing alumina-reinforced aluminum matrix composites by self-oxidation cumulative rolling includes the following steps: S1, Material preparation: Prepare aluminum plate A (1) with a length × width × height of 300mm × 150mm × 10mm and material of 7075 aluminum alloy, and aluminum plate B (2) with a length × width × height of 300mm × 150mm × 10mm and material of 7075 aluminum alloy. Remove oil and oxide film from the surface of aluminum plate A (1) and aluminum plate B (2), and then roughen the surfaces of aluminum plate A (1) and aluminum plate B (2) to be laminated. S2, surface self-oxidation heating: aluminum plate A (1) and aluminum plate B (2) obtained in step S1 are heated to 370°C in a heating furnace (4) without oxygen protection measures, so that an aluminum oxide layer of 1μm thickness is formed on the surface of aluminum plate A (1) and aluminum plate B (2). S3, Preparation of corrugated metal composite plate (A / B) 1: The aluminum plates heated in step S2 are stacked together with aluminum plate A (1) on the bottom and aluminum plate B (2) on the top, and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 70% using a two-roll mill consisting of upper cross corrugated rolls (5) and lower cross corrugated rolls (6). After straightening, trimming, and cutting off the head and tail, corrugated metal composite plate (A / B) 1 (9) is prepared. S4, Prepare corrugated metal composite plate (A / B) 2: Cut the corrugated metal composite plate (A / B) 1 (9) prepared in step S3 into two metal composite plates (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) of the same size by transverse centering; Remove the oil and oxide film from the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11) and roughen them by grinding; Then heat to 370°C in a heating furnace (4) without oxygen protection measures so that a 1μm thick aluminum oxide layer is formed on the surface of metal composite plate (A / B) 1 1 (10) and metal composite plate (A / B) 2 1 (11); Then place metal composite plate (A / B) 1 1 (10) below and metal composite plate (A / B) 2 1 (11) below. 1(11) The composite panels are stacked together in the above manner and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 70% using a two-roll mill consisting of an upper cross-corrugated roll (5) and a lower cross-corrugated roll (6). After straightening, trimming, and cutting off the head and tail, a corrugated metal composite plate (A / B)2 is prepared. S5. Repeat step S4 until the corrugated metal composite plate (A / B) is prepared. 11 (15); S6, Prepare metal composite plate (A / B) 12 Corrugated metal composite panels (A / B) 11(15) Cut along the transverse center to obtain two metal composite plates (A / B) 1 11 (16) and (A / B) 2 11 (17) of the same size; remove the oil and oxide film from the surface of metal composite plates (A / B) 1 11 (16) and (A / B) 2 11 (17) and roughen them; then heat them to 370°C in a heating furnace (4) without oxygen protection measures, so that a 1μm thick aluminum oxide layer is formed on the surface of both metal composite plates (A / B) 1 11 (16) and (A / B) 2 11 (17); then place metal composite plate (A / B) 1 11 (16) below and metal composite plate (A / B) 2 11 (17) below. 11 (17) are stacked together in the above manner and the surfaces to be composited are in contact to form a preform. The preform is rolled with a reduction rate of 70% using a two-roll mill consisting of an upper flat roll (7) and a lower flat roll (8). After straightening, trimming, and cutting off the head and tail, a metal composite plate (A / B) is prepared. 12 (18); S7, Take the metal composite plate (A / B) prepared in step S6. 12 (18) The aluminum oxide reinforced aluminum-based composite board was obtained by uniform annealing at 410℃ for 3 hours, followed by low-temperature aging treatment, and finally straightening and trimming.

[0032] The surface of the cross-corrugated roller used in Example 3 is a curved surface formed by the intersection of transverse and longitudinal corrugations. The corrugation curve is a parabola with a wavelength of 8 mm and an amplitude of 1 mm.

[0033] Figure 1 This is a schematic diagram of the process for preparing alumina-reinforced aluminum matrix composites by self-oxidation cumulative rolling in Examples 1-3 of the present invention.

[0034] Figure 1 In the middle, aluminum plate A—(1), aluminum plate B—(2), grinding device—(3), heating furnace—(4), upper cross corrugated roller—(5), lower cross corrugated roller—(6), upper flat roller—(7), lower flat roller—(8), corrugated metal composite plate (A / B) 1—(9), metal composite plate (A / B) 1 1—(10), metal composite plate (A / B) 2 1—(11), corrugated metal composite plate (A / B) n-2 —(12)Metal composite plate (A / B)1 n-2—(13)Metal composite plate (A / B)2 n-2—(14)Corrugated metal composite plate (A / B) n-1 —(15)Metal composite plate (A / B)1 n-1—(16)Metal composite plate (A / B)2 n-1—(17)Metal composite plate (A / B) n —(18)

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing alumina-reinforced aluminum matrix composites by self-oxidation rolling, characterized in that, Includes the following steps: (1) Take an aluminum plate, remove the oil and oxide film from the surface and roughen it. Heat it in an oxygen-containing atmosphere to form an aluminum oxide layer with a thickness of 0.1~1μm on the surface of the aluminum plate, and obtain the first oxide layer aluminum plate. Two aluminum plates with the first oxide layer are stacked together to form a preform. The preform is rolled using a two-roll mill with cross-corrugated upper and lower rolls. After straightening and trimming, the first composite plate is obtained. (2) Cut the first composite plate in the transverse direction to obtain two first composite plate sub-plates of the same size; remove the oil and oxide film from the surface of the first composite plate sub-plate and roughen it, then heat it in an oxygen-containing atmosphere to form an aluminum oxide layer of 0.1~1μm thickness on the surface of the aluminum plate to obtain the second oxide layer aluminum plate. The two aluminum plates with the second oxide layer are stacked together to form a preform, which is rolled using a two-roll mill with cross-corrugated upper and lower rolls. After straightening, trimming, and cutting off the head and tail, the second composite plate is prepared. (3) Repeat step (2) n times to obtain the (n+2)th composite plate; (4) Cut the n+2 composite plate in the transverse direction to obtain two n+2 composite plate sub-plates of the same size; remove the oil and oxide film from the surface of the n+2 composite plate sub-plates and roughen them, then heat them in an oxygen-containing atmosphere to form an aluminum oxide layer of 0.1~1μm thickness on the surface of the aluminum plate, to obtain the n+3 oxide layer aluminum plate. The two aluminum plates with the n+3 oxide layer are stacked together to form a preform, which is rolled using a two-roll mill with flat upper and lower rolls. After straightening, trimming, and removing the head and tail, a metal composite plate is prepared. (5) Annealing, straightening and trimming are performed on the metal composite plate to obtain the alumina-reinforced aluminum-based composite plate; The n is an integer ≥ 1; In steps (1) and (2), the surface of the cross-corrugated roller is a curved surface formed by the intersection of transverse and longitudinal corrugations, and the corrugation curve is a sine curve, a cosine curve, or a parabola; the wavelength of the corrugation curve is ≤8mm and the amplitude is ≤1mm.

2. The method according to claim 1, characterized in that, The aluminum plate is made of industrial pure aluminum, 3-series aluminum alloy, 6-series aluminum alloy, or 7-series aluminum alloy; the thickness of the aluminum plate is 2~10mm.

3. The method according to claim 1, characterized in that, In steps (1), (2), and (3), the heating temperature is 70% to 90% of the melting point of the aluminum plate.

4. The method according to claim 1, characterized in that, In steps (1), (2), and (3), the rolling reduction rate is 50% to 70%.

5. An alumina-reinforced aluminum-based composite material prepared by the method according to any one of claims 1-4.

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