A method for producing an aluminum matrix composite material that forms a synergistic strengthening of grain boundaries and grains

Abstract

The application provides a preparation method of an aluminum matrix composite material forming grain boundary and intracrystalline synergistic strengthening, relates to the field of powder metallurgy, and solves the problem of poor strength-plasticity and insufficient high-temperature resistance of the existing aluminum matrix composite material.The main technical scheme is as follows: the aluminum matrix composite material preparation method comprises the following steps: performing ball milling and mixing treatment on raw material powder; the raw material powder comprises aluminum powder, nano TiO2 powder and nano Al2O3 powder; performing sintering treatment on the powder after the ball milling and mixing treatment; during the sintering treatment, Al and TiO2 perform incomplete reaction, an amorphous Al2O3 layer is generated on the surface of TiO2 particles, and a core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 is formed; performing plastic processing treatment on the composite material after the sintering treatment, so that the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 enters the grain interior to obtain the aluminum matrix composite material.The application is mainly used for improving the strength-plasticity and high-temperature resistance of the aluminum matrix composite material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder metallurgy, in particular to a preparation method of an aluminum matrix composite material with synergistic strengthening of grain boundary and intragranular. BACKGROUND

[0002] A significant limitation of the current aluminum alloy material system is the lack of heat resistance. Traditional high-strength aluminum alloys can usually only maintain their superior performance at temperatures below 100℃. Once the temperature rises above 200℃, their strength will rapidly decline. Even the Al-Si or Al-Cu series alloys designed to improve heat resistance, their strength is difficult to break through the 100MPa threshold at high temperatures of 350℃. On the other hand, aluminum alloys such as Al-Fe-V-Si that use dispersion strengthening technology can improve heat resistance, but their preparation process is extremely complex, and large-scale industrial production faces many challenges, limiting their widespread application in actual engineering. For key components that operate for a long time in extreme temperature conditions (200-400℃), such as aircraft structures, engine components, and high-efficiency heat sinks, they are currently mostly made of titanium alloys, stainless steels, and other high-temperature resistant materials. However, these materials, while meeting the strength requirements in high-temperature environments, often come with higher weights, posing a problem for lightweight design of equipment, and thus affecting further improvement and breakthroughs in overall performance indicators. Therefore, developing new, lightweight aluminum alloys with excellent heat resistance has become an important research direction for improving the performance of equipment in related fields.

[0003] Using nano ceramic particles as a strengthening phase can have very excellent thermal stability, thereby obtaining good high-temperature resistance. However, the introduced strengthening phase is mostly located at the grain boundary, which can play a role in pinning the grain boundary, but has very weak pinning effect on intragranular dislocations, causing a large number of dislocations to concentrate at the grain boundary during loading and leading to intergranular fracture, resulting in insufficient strength and toughness of the material. For example, through in-situ reaction of Al-TiO2, nano Al2O3 particles and Al3Ti particles can be introduced into the aluminum matrix. The nano Al2O3 particles can pin the aluminum grain boundary to make the material have high high-temperature strength. However, nano Al2O3 particles are not easy to enter the grain interior, resulting in the inability to pin intragranular dislocations, making it difficult to further improve high-temperature strength, and easily causing dislocations to concentrate near the grain boundary, causing intergranular cracking. In addition, Al3Ti particles are difficult to maintain nano size, and after coarsening, their effect on improving high-temperature strength is very low.

[0004] In summary, the current aluminum matrix composite material has the problems of poor strength-plasticity and insufficient high-temperature resistance. SUMMARY

[0005] Therefore, the application provides a preparation method of an aluminum matrix composite material with grain boundary and intragranular synergistic strengthening, which aims to improve the strength and plasticity and high-temperature resistance of the aluminum matrix composite material.

[0006] To achieve the above-mentioned purpose, the application mainly provides the following technical scheme:

[0007] In one aspect, the application provides a preparation method of an aluminum matrix composite material with grain boundary and intragranular synergistic strengthening, which comprises the following steps:

[0008] Ball-milling mixing treatment: raw material powder is subjected to ball-milling mixing treatment to obtain powder after ball-milling mixing treatment; wherein the raw material powder comprises aluminum powder, nano-TiO2 powder and nano-Al2O3 powder;

[0009] Powder metallurgy sintering treatment: the powder after ball-milling mixing treatment is subjected to sintering treatment to obtain a composite material after sintering treatment; wherein during the sintering treatment, Al and TiO2 perform incomplete reaction, an amorphous Al2O3 layer is generated on the surface of TiO2 particles, and a core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 is formed;

[0010] Plastic processing treatment: the composite material after sintering treatment is subjected to plastic processing treatment to promote the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 to enter the grain interior, and an aluminum matrix composite material is obtained.

[0011] Preferably, in the raw material powder: the average particle size of the aluminum powder is 5-50 μm; and / or the average particle size of the nano-TiO2 powder is 15-40 nm; and / or the average particle size of the nano-Al2O3 powder is 15-50 nm.

[0012] Preferably, in the raw material powder: the volume fraction of the nano-TiO2 powder is 3-8%, and the volume fraction of the nano-Al2O3 powder is 1-3%.

[0013] Preferably, in the step of ball-milling mixing treatment: the weight ratio of ball to material is 15:1-30:1; and / or the maximum linear speed of the milling ball during the ball-milling mixing treatment is greater than 3.5 m / s; and / or the ball-milling mixing treatment time is 4-20 hours.

[0014] Preferably, in the step of powder metallurgy sintering treatment: the powder after ball-milling mixing treatment is subjected to cold pressing forming before sintering treatment to improve the density.

[0015] Preferably, in the step of powder metallurgy sintering treatment: the sintering treatment temperature is 580-645 ℃; and preferably, the sintering treatment time is 1-5 hours.

[0016] Preferably, in the step of the powder metallurgy sintering process: the sintering process is any one of vacuum hot-pressing sintering process, hot isostatic pressing sintering process, and discharge ion beam sintering process.

[0017] Preferably, in the step of the plastic processing process: the temperature of the plastic processing process is 520-630℃; and / or the mode of the plastic processing process is any one of forging, rolling, and extrusion; and / or the deformation amount of the plastic processing process is (6-30):1.

[0018] In another aspect, the embodiment of the present application provides an aluminum matrix composite, wherein the microstructure of the aluminum matrix composite comprises an Al matrix, non-crystalline Al2O3-coated TiO2 core-shell structure reinforcing phase particles, and nano Al2O3 particles; wherein at least part of the non-crystalline Al2O3-coated TiO2 core-shell structure reinforcing phase particles are located inside the grains; and at least part of the Al2O3 particles are distributed at the grain boundaries.

[0019] Preferably, the volume fraction of the non-crystalline Al2O3-coated TiO2 core-shell structure reinforcing phase particles located inside the grains is more than 50%.

[0020] Preferably, the volume fraction of the Al2O3 particles distributed at the grain boundaries is more than 80%.

[0021] Preferably, the particle size of the non-crystalline Al2O3-coated TiO2 core-shell structure reinforcing phase particles is less than 50nm.

[0022] Preferably, the microstructure of the aluminum matrix composite further comprises Al3Ti particles; wherein the particle size of the Al3Ti particles is less than 1μm, and the Al3Ti particles are distributed in the aluminum matrix.

[0023] Preferably, the aluminum matrix composite is prepared by the method for preparing an aluminum matrix composite with grain boundary-grain inside synergistic reinforcement according to any one of the above.

[0024] Compared with the prior art, the method for preparing an aluminum matrix composite with grain boundary-grain inside synergistic reinforcement according to the present application has at least the following beneficial effects:

[0025] In one aspect, the embodiment of the present application provides a preparation method of an aluminum matrix composite material forming grain boundary-intragranular synergistic strengthening, mainly comprising the following steps: performing ball milling mixing treatment on raw material powder to obtain the ball milling mixing treated powder; wherein the raw material powder comprises aluminum powder, nano TiO2 powder and nano Al2O3 powder; performing sintering treatment on the ball milling mixing treated powder to obtain the sintering treated composite material; wherein during the sintering treatment, Al and TiO2 perform incomplete reaction, an amorphous Al2O3 layer is generated on the surface of TiO2 particles to form the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2; and performing plastic processing treatment on the sintering treated composite material to promote the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 to enter the grain interior to obtain the aluminum matrix composite material. It is to be noted that for the Al-TiO2 system, the present application adds nano Al2O3 powder in the raw material powder, further inhibits the reaction of Al and TiO2 through the process parameters, makes Al and TiO2 perform incomplete reaction during the sintering treatment to generate an amorphous Al2O3 layer on the surface of TiO2 particles to form the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2, further promotes the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 to enter the grain interior through the plastic processing treatment, and makes the nano Al2O3 particles (namely, the nano Al2O3 powder in the raw material, referred to as the added nano Al2O3 particles) mainly distribute at the grain boundary during the ball milling mixing treatment and the plastic processing treatment (the whole preparation process) to play the intragranular-grain boundary synergistic strengthening, thereby improving the strength-plasticity and high temperature resistance of the aluminum matrix composite material. l2 O3 coated TiO2 to enter the grain interior, and during the ball milling mixing treatment and the plastic processing treatment (the whole preparation process), the nano Al2O3 particles (namely, the nano Al2O3 powder in the raw material, referred to as the added nano Al2O3 particles) mainly distribute at the grain boundary to play the intragranular-grain boundary synergistic strengthening, thereby improving the strength-plasticity and high temperature resistance of the aluminum matrix composite material.

[0026] In summary, the method of the present application is based on the in-situ reaction of Al-TiO2, and the added nano Al2O3 particles are used to inhibit the full reaction to form the core-shell structure strengthening phase particle of amorphous Al2O3 coated TiO2 and realize the intragranular distribution, thereby obtaining the aluminum matrix composite material with excellent strength-plasticity.

[0027] Compared with the traditional high temperature aluminum alloy and the aluminum matrix composite material, the aluminum matrix composite material prepared by the present application has higher thermal stability and strength-plasticity.

[0028] In the existing aluminum matrix composite, Al-TiO2 fully reacts to form (Al2O3+Al3Ti) / Al, and Al2O3 in this is difficult to separate from the grain boundary into the grain interior, and the material grain boundary fracture tendency is significant, and a large number of micron-sized Al3Ti particles are generated, which has little contribution to high-temperature strength and is easy to cause fracture. Unlike the corresponding technology, the incomplete reaction of the core-shell structure strengthening phase particles of the present application forms a core-shell structure, and due to the existence of the surface amorphous layer, it is easy to enter the grain interior, and the added nano Al2O3 particles are easy to stay in the grain boundary, thereby realizing grain boundary-grain interior synergistic strengthening, in addition, the present application only generates a small amount of Al3Ti particles and the size is extremely small (less than 1 μm), the strengthening efficiency is higher, and the mechanical properties of the material are more excellent.

[0029] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and the content of the specification can be implemented, the following is a preferred embodiment of the present application and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The present application provides a kind of aluminum matrix composite preparation method for forming grain boundary-grain interior synergistic strengthening. DETAILED DESCRIPTION

[0031] To further illustrate the technical means and effects taken by the present application to achieve the predetermined invention purpose, the following describes the specific embodiments, structures, features and effects according to the present application in detail with reference to the drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0032] The inventive concept of the present application is as follows: in the Al-TiO2 in-situ reaction system, the added nano Al2O3 particles are doped to inhibit the full reaction of Al-TiO2, to form the core-shell structure of amorphous Al2O3 coated TiO2 strengthening phase, and the core-shell structure is easy to enter the grain interior due to the existence of the surface amorphous layer, and the added nano Al2O3 particles are easy to stay on the grain boundary, so that the grain boundary-grain interior synergistic strengthening can be realized by further shaping processing, and the aluminum matrix composite material with excellent strength and plasticity and high temperature resistance can be obtained. The scheme of the present application is as follows:

[0033] On the one hand, the present application provides a kind of aluminum matrix composite preparation method for forming grain boundary-grain interior synergistic strengthening, as shown in Figure 1 The method mainly includes the following steps:

[0034] Ball-milling mixing treatment: the raw material powder is subjected to ball-milling mixing treatment to obtain a powder after ball-milling mixing treatment; wherein the raw material powder comprises aluminum powder, nano-TiO2 powder and nano-Al2O3 powder.

[0035] In the raw material powder, the average particle size of the aluminum powder is 5-50 μm; the average particle size of the nano-TiO2 powder is 15-40 nm; and the average particle size of the nano-Al2O3 powder is 15-50 nm.

[0036] In the raw material powder, the volume fraction of the nano-TiO2 powder is 3-8%, and the volume fraction of the nano-Al2O3 powder is 1-3%.

[0037] In the ball-milling mixing treatment, the ball-to-material weight ratio is 15:1-30:1, the maximum linear speed of the milling balls during the ball-milling mixing treatment is greater than 3.5 m / s, and the ball-milling mixing treatment time is 4-20 hours.

[0038] Powder metallurgy sintering treatment: the powder after ball-milling mixing treatment is subjected to sintering treatment to obtain a composite material after sintering treatment; wherein during the sintering treatment, Al and TiO2 undergo incomplete reaction to form a core-shell structure of amorphous Al2O3-coated TiO2.

[0039] Before the sintering treatment, the powder after ball-milling mixing treatment is subjected to cold pressing forming to improve the density.

[0040] The sintering treatment is any one of vacuum hot-pressing sintering treatment, hot isostatic pressing sintering treatment and discharge ion beam sintering treatment, and the atmosphere is vacuum atmosphere or protective atmosphere. The sintering treatment temperature is 580-645 ℃ (preferably, the sintering treatment time is 1-5 hours). During the sintering treatment, Al and TiO2 undergo incomplete reaction to form a core-shell structure of amorphous Al2O3-coated TiO2, and the core-shell structure particle is more likely to enter the interior of the aluminum crystal grain to pin dislocations due to the presence of the surface amorphous layer.

[0041] Plastic processing treatment: the composite material after sintering treatment is subjected to plastic processing treatment to promote the core-shell structure of amorphous Al2O3-coated TiO2 as a strengthening phase to enter the interior of the crystal grain to obtain an aluminum-based composite material.

[0042] In the step, the distribution of the strengthening phase can be regulated by plastic working process such as forging, rolling and extrusion, the deformation temperature is 520-630 ℃ (preferably, the deformation amount is 6-30:1), which can promote the non-crystalline Al2O3-coated TiO2 core-shell structure strengthening phase particles to enter the grain interior, in addition, during the ball milling mixing process and the plastic working process (the whole preparation process), the nano Al2O3 particles are mainly distributed at the grain boundary, thereby forming the grain boundary-grain interior synergistic strengthening.

[0043] In another aspect, the embodiment of the present application provides an aluminum matrix composite, wherein the microstructure of the aluminum matrix composite comprises an Al matrix, non-crystalline Al2O3-coated TiO2 core-shell structure strengthening phase particles and nano Al2O3 particles; wherein at least part of the non-crystalline Al2O3-coated TiO2 core-shell structure strengthening phase particles are located in the grain interior; at least part of the Al2O3 particles are distributed at the grain boundary; preferably, the volume fraction of more than 50% of the non-crystalline Al2O3-coated TiO2 core-shell structure strengthening phase particles are located in the grain interior; preferably, the volume fraction of more than 80% of the Al2O3 particles are distributed at the grain boundary; preferably, the particle size of the non-crystalline Al2O3-coated TiO2 core-shell structure strengthening phase particles is less than 50 nm; preferably, the microstructure of the aluminum matrix composite further comprises Al3Ti particles; wherein the particle size of the Al3Ti particles is less than 1 μm and the Al3Ti particles are distributed in the Al matrix. The volume fraction of more than 80% of the Al2O3 particles are distributed at the grain boundary, and the rest of the Al2O3 particles are located in the grain interior.

[0044] The present application is further illustrated by the following specific experimental examples:

[0045] Example 1

[0046] The present embodiment prepares an aluminum matrix composite, which mainly comprises the following steps:

[0047] Ball milling mixing process: the raw material powder is subjected to ball milling treatment to obtain the powder after ball milling mixing treatment; wherein the raw material powder comprises aluminum powder with an average particle size of 5 μm, nano TiO2 powder with an average particle size of 20 nm and nano Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano TiO2 powder is 6%, and the volume fraction of the nano Al2O3 powder is 2%. The ball milling mixing treatment is carried out in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball milling mixing treatment time is 8 hours.

[0048] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 620℃, and the time of the vacuum sintering treatment is 2 hours.

[0049] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550℃, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0050] The aluminum-based composite material prepared in the embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350℃ is 216MPa, the elongation is 5%, and the strength does not decrease after annealing at 350℃ for 1000h. In the microstructure of the aluminum-based composite material prepared in the embodiment, most of the core-shell structure reinforced phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0051] Example 2

[0052] The aluminum-based composite material prepared in the embodiment is prepared mainly by the following steps:

[0053] Ball milling mixing treatment: the raw material powder is subjected to ball milling treatment to obtain the powder after the ball milling mixing treatment; wherein the raw material powder includes: aluminum powder with an average particle size of 40μm, nano-TiO2 powder with an average particle size of 20nm, and nano-Al2O3 powder with an average particle size of 20nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball milling mixing treatment is carried out in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350rpm, the maximum linear speed of the milling ball is 4.4m / s, and the ball milling mixing treatment time is 8 hours.

[0054] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 620℃, and the time of the vacuum sintering treatment is 2 hours.

[0055] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550℃, and the extrusion ratio is 10:1, to obtain the aluminum-based composite material.

[0056] The aluminum-based composite material prepared in this example exhibits excellent toughness and high-temperature resistance. Specifically, the aluminum-based composite material exhibits a tensile strength of 210 MPa and an elongation of 5% at 350°C. Its strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum-based composite material prepared in this example, the core-shell structure of amorphous Al2O3-coated TiO2 reinforcing phase particles is primarily located within the grains, while the nano-Al2O3 particles are primarily located at the grain boundaries.

[0057] Example 3

[0058] This embodiment prepares an aluminum-based composite material, which mainly includes the following steps:

[0059] Ball milling: The raw material powders are ball milled to obtain a ball-milled powder. The raw material powders include aluminum powder with an average particle size of 20 μm, nano-TiO2 powder with an average particle size of 15 nm, and nano-Al2O3 powder with an average particle size of 20 nm. The volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball milling is performed in a high-energy ball mill with a ball-to-material weight ratio of 15:1, a rotation speed of 350 rpm, a maximum linear velocity of 4.4 m / s, and a duration of 8 hours.

[0060] Powder metallurgy sintering treatment: vacuum sintering treatment is performed on the powder after ball milling mixing treatment to obtain a sintered composite material (sintered ingot); wherein the vacuum sintering treatment temperature is 620° C. and the vacuum sintering treatment time is 1 hour.

[0061] Plastic processing: The sintered composite material is subjected to hot extrusion treatment, wherein the hot extrusion treatment temperature is 550° C. and the extrusion ratio is 20:1, to obtain an aluminum-based composite material.

[0062] The aluminum-based composite material prepared in this example exhibits excellent toughness and high-temperature resistance. Specifically, the aluminum-based composite material exhibits a tensile strength of 220 MPa and an elongation of 5% at 350°C. Its strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum-based composite material prepared in this example, the core-shell structure of amorphous Al2O3-coated TiO2 reinforcing phase particles is primarily located within the grains, while the nano-Al2O3 particles are primarily located at the grain boundaries.

[0063] Example 4

[0064] This embodiment prepares an aluminum-based composite material, which mainly includes the following steps:

[0065] Ball-milling mixing treatment: the raw material powder is subjected to ball-milling treatment to obtain a powder after ball-milling mixing treatment; wherein the raw material powder comprises: aluminum powder with an average particle size of 20 μm, nano-TiO2 powder with an average particle size of 40 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball-milling mixing treatment is performed in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball-milling mixing treatment time is 8 hours.

[0066] Powder metallurgy sintering treatment: the powder after ball-milling mixing treatment is subjected to vacuum sintering treatment to obtain a composite material after sintering treatment (sintered blank); wherein the temperature of the vacuum sintering treatment is 620°C, and the vacuum sintering treatment time is 2 hours.

[0067] Plastic processing treatment: the composite material after sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550°C, and the extrusion ratio is 16:1, to obtain an aluminum-based composite material.

[0068] The aluminum-based composite material prepared in this embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350°C is 206 MPa, the elongation is 5.5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum-based composite material prepared in this embodiment, most of the core-shell structure reinforced phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0069] Example 5

[0070] This embodiment prepares an aluminum-based composite material, which mainly comprises the following steps:

[0071] Ball-milling mixing treatment: the raw material powder is subjected to ball-milling treatment to obtain a powder after ball-milling mixing treatment; wherein the raw material powder comprises: aluminum powder with an average particle size of 20 μm, nano-TiO2 powder with an average particle size of 25 nm, and nano-Al2O3 powder with an average particle size of 15 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball-milling mixing treatment is performed in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball-milling mixing treatment time is 8 hours.

[0072] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 645℃, and the time of the vacuum sintering treatment is 1 hour.

[0073] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550℃, and the extrusion ratio is 25:1, to obtain the aluminum-based composite material.

[0074] The aluminum-based composite material prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350℃ is 222MPa, the elongation is 4.5%, and the strength does not decrease after annealing at 350℃ for 1000h. In the microstructure of the aluminum-based composite material prepared in the embodiment, most of the core-shell structure reinforced phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0075] Example 6

[0076] The aluminum-based composite material prepared in the embodiment mainly includes the following steps:

[0077] Ball milling mixing treatment: the raw material powder is subjected to ball milling treatment to obtain the powder after the ball milling mixing treatment; wherein the raw material powder includes: aluminum powder with an average particle size of 20μm, nano-TiO2 powder with an average particle size of 25nm, and nano-Al2O3 powder with an average particle size of 50nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball milling mixing treatment is carried out in a high-energy ball mill, the ball-to-material weight ratio is 30:1, the rotation speed is 350rpm, the maximum linear speed of the milling ball is 4.4m / s, and the ball milling mixing treatment time is 8 hours.

[0078] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 620℃, and the time of the vacuum sintering treatment is 4 hours.

[0079] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 630℃, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0080] The aluminum matrix composite prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum matrix composite at 350°C is 203 MPa, the elongation is 5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum matrix composite prepared in the embodiment, most of the core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0081] Example 7

[0082] The aluminum matrix composite prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum matrix composite at 350°C is 203 MPa, the elongation is 5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum matrix composite prepared in the embodiment, most of the core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0083] Ball milling treatment: the raw material powder is subjected to ball milling treatment to obtain the powder after ball milling treatment; wherein the raw material powder includes: aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 20 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 8%, and the volume fraction of the nano-Al2O3 powder is 1%. The ball milling treatment is carried out in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball milling treatment time is 20 hours.

[0084] Powder metallurgy sintering treatment: the powder after ball milling treatment is subjected to vacuum sintering treatment to obtain the composite material after sintering treatment (sintered blank ingot); wherein the temperature of the vacuum sintering treatment is 580°C, and the time of the vacuum sintering treatment is 2 hours.

[0085] Plastic processing treatment: the composite material after sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550°C, and the extrusion ratio is 16:1, to obtain the aluminum matrix composite.

[0086] The aluminum matrix composite prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum matrix composite at 350°C is 203 MPa, the elongation is 5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum matrix composite prepared in the embodiment, most of the core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0087] Example 8

[0088] The aluminum matrix composite prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum matrix composite at 350°C is 203 MPa, the elongation is 5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum matrix composite prepared in the embodiment, most of the core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0089] Ball-milling mixing treatment: the raw material powder is subjected to ball-milling treatment to obtain a powder after ball-milling mixing treatment; wherein the raw material powder comprises: aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 20 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball-milling mixing treatment is performed in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball-milling mixing treatment time is 8 hours.

[0090] Powder metallurgy sintering treatment: the powder after ball-milling mixing treatment is subjected to vacuum sintering treatment to obtain a composite material after sintering treatment (sintered blank); wherein the temperature of the vacuum sintering treatment is 640°C, and the vacuum sintering treatment time is 2 hours.

[0091] Plastic processing treatment: the composite material after sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550°C, and the extrusion ratio is 16:1, to obtain an aluminum-based composite material.

[0092] The aluminum-based composite material prepared in this embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350°C is 206 MPa, the elongation is 6%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum-based composite material prepared in this embodiment, most of the core-shell structure reinforced phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0093] Example 9

[0094] This embodiment prepares an aluminum-based composite material, which mainly comprises the following steps:

[0095] Ball-milling mixing treatment: the raw material powder is subjected to ball-milling treatment to obtain a powder after ball-milling mixing treatment; wherein the raw material powder comprises: aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 20 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball-milling mixing treatment is performed in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350 rpm, the maximum linear speed of the milling ball is 4.4 m / s, and the ball-milling mixing treatment time is 8 hours.

[0096] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 620℃, and the time of the vacuum sintering treatment is 2 hours.

[0097] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 520℃, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0098] The aluminum-based composite material prepared in the embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350℃ is 215MPa, the elongation is 5%, and the strength does not decrease after annealing at 350℃ for 1000h. In the microstructure of the aluminum-based composite material prepared in the embodiment, most of the core-shell structure reinforced phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0099] Example 10

[0100] The aluminum-based composite material prepared in the embodiment is prepared mainly by the following steps:

[0101] Ball milling mixing treatment: the raw material powder is subjected to ball milling treatment to obtain the powder after the ball milling mixing treatment; wherein the raw material powder includes: aluminum powder with an average particle size of 15μm, nano-TiO2 powder with an average particle size of 20nm, and nano-Al2O3 powder with an average particle size of 20nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 6%, and the volume fraction of the nano-Al2O3 powder is 2%. The ball milling mixing treatment is carried out in a high-energy ball mill, the ball-to-material weight ratio is 20:1, the rotation speed is 350rpm, the maximum linear speed of the milling ball is 4.4m / s, and the ball milling mixing treatment time is 8 hours.

[0102] Powder metallurgy sintering treatment: the powder after the ball milling mixing treatment is subjected to vacuum sintering treatment to obtain the composite material after the sintering treatment (sintered billet); wherein the temperature of the vacuum sintering treatment is 620℃, and the time of the vacuum sintering treatment is 2 hours.

[0103] Plastic processing treatment: the composite material after the sintering treatment is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 630℃, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0104] The aluminum matrix composite prepared in the embodiment has excellent strength and toughness and high temperature resistance. Specifically, the tensile strength of the aluminum matrix composite at 350°C is 210 MPa, the elongation is 6%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum matrix composite prepared in the embodiment, most of the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano Al2O3 particles are located on the grain boundaries.

[0105] Comparative Example 1

[0106] In Comparative Example 1, the average particle size of the TiO2 powder in the raw material powder is 150 nm, compared with Example 1.

[0107] The other steps and parameters are consistent with those in Example 1.

[0108] Here, because the average particle size of the TiO2 powder used in Comparative Example 1 is too large (it should be noted that the ball milling process has little effect on the size of the reinforcing phase, which is wrapped by aluminum powder), it is difficult for the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 to enter the grain interior, and high strength and toughness cannot be achieved.

[0109] Comparative Example 2

[0110] In Comparative Example 2, the average particle size of the TiO2 powder in the raw material powder is 5 nm, compared with Example 1.

[0111] The other steps and parameters are consistent with those in Example 1.

[0112] Here, because the average particle size of the TiO2 powder in Comparative Example 2 is too small, the small TiO2 powder is prone to react with aluminum during the sintering process, and the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 cannot be generated.

[0113] Comparative Example 3

[0114] In Comparative Example 3, the average particle size of the nano Al2O3 powder in the raw material powder is 150 nm, compared with Example 1.

[0115] The other steps and parameters are consistent with those in Example 1.

[0116] Here, because the average particle size of the nano Al2O3 powder is too large, the surface area is small, the Al-TiO2 reaction cannot be inhibited, and the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 cannot be formed.

[0117] Comparative Example 4

[0118] Comparative Example 4

[0119] Other steps and parameters are consistent with Example 1.

[0120] Here, because the average particle size of the nano-Al2O3 powder is too small, it easily enters the grain interior during the ball milling process, and cannot inhibit grain boundary diffusion, so it is difficult to inhibit the Al-TiO2 reaction, and the core-shell structure of amorphous Al2O3-coated TiO2 strengthening phase particles cannot be formed.

[0121] Comparative Example 5

[0122] Comparative Example 5 prepared an aluminum matrix composite, compared with Example 1, the temperature of the hot extrusion treatment in Comparative Example 4 is 400°C.

[0123] Other steps and parameters are consistent with Example 1.

[0124] Here, because the temperature of the hot extrusion treatment is too low, the aluminum matrix is difficult to fully recrystallize during the extrusion treatment process, and the strengthening phase cannot enter the grain interior, so grain boundary-grain interior synergistic strengthening cannot be achieved.

[0125] Comparative Example 6

[0126] Comparative Example 6 prepared an aluminum matrix composite, compared with Example 1, the temperature of the sintering treatment in Comparative Example 6 is 550°C.

[0127] Other steps and parameters are consistent with Example 1.

[0128] Here, because the temperature of the sintering treatment in Comparative Example 6 is too low, in-situ reaction cannot be activated, and it is difficult to form the core-shell structure of amorphous Al2O3-coated TiO2 strengthening phase particles.

[0129] Comparative Example 7

[0130] Comparative Example 7 prepared an aluminum matrix composite, compared with Example 1, the temperature of the sintering treatment in Comparative Example 7 is 655°C.

[0131] Other steps and parameters are consistent with Example 1.

[0132] Here, because the temperature of the sintering treatment in Comparative Example 7 is too high, Al-TiO2 completely reacts, and it is difficult to form the core-shell structure of amorphous Al2O3-coated TiO2 strengthening phase particles.

[0133] Example 11

[0134] This example prepared an aluminum matrix composite, which mainly includes the following steps:

[0135] Ball milling treatment: the raw material powder is subjected to ball milling treatment to obtain a ball-mixed powder; wherein the raw material powder comprises: aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 20 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 8%, and the volume fraction of the nano-Al2O3 powder is 3%. The ball milling treatment is performed in a high-energy ball mill, the ball-to-material ratio is 20:1, the rotation speed is 350 rpm, and the maximum linear speed is 4.4 m / s. The ball milling treatment is performed for 8 hours.

[0136] Powder metallurgy sintering treatment: the ball-mixed powder is subjected to vacuum hot-press sintering treatment to obtain a sintered composite material; wherein the vacuum sintering treatment is performed at a temperature of 620 ℃ for 2 hours.

[0137] Plastic processing treatment: the sintered composite material is subjected to hot extrusion treatment, wherein the hot extrusion treatment is performed at a temperature of 550 ℃, and the extrusion ratio is 16:1, to obtain an aluminum-based composite material.

[0138] The aluminum-based composite material obtained in this embodiment has excellent strength and toughness and high-temperature resistance. The tensile strength of the aluminum-based composite material at 350 ℃ is 250 MPa, and the elongation is 3%. The strength of the aluminum-based composite material does not decrease after annealing at 350 ℃ for 1000 hours. In the aluminum-based composite material, most of the core-shell structure reinforcing phase particles of amorphous Al2O3-coated TiO2 are located inside the grains, and most of the additional Al2O3 particles are located on the grain boundaries.

[0139] Example 12

[0140] This embodiment prepares an aluminum-based composite material, which mainly comprises the following steps:

[0141] Ball milling treatment: the raw material powder is subjected to ball milling treatment to obtain a ball-mixed powder; wherein the raw material powder comprises: aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 20 nm, and nano-Al2O3 powder with an average particle size of 20 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 8%, and the volume fraction of the nano-Al2O3 powder is 3%. The ball milling treatment is performed in a high-energy ball mill, the ball-to-material ratio is 20:1, the rotation speed is 350 rpm, and the maximum linear speed is 4.4 m / s. The ball milling treatment is performed for 8 hours.

[0142] Powder metallurgy sintering treatment: the ball-mixed powder is subjected to vacuum hot-press sintering treatment to obtain a sintered composite material (sintered billet); wherein the vacuum hot-press sintering treatment is performed at a temperature of 620 ℃ for 2 hours.

[0143] Plastic processing treatment: the sintered composite material is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550°C, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0144] The aluminum-based composite material prepared in this embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350°C is 180 MPa, the elongation is 9%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the microstructure of the aluminum-based composite material prepared in this embodiment, most of the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the nano-Al2O3 particles are located on the grain boundaries.

[0145] Example 13

[0146] In this embodiment, an aluminum-based composite material is prepared, which mainly includes the following steps:

[0147] Ball milling treatment: the raw material powder is subjected to ball milling treatment to obtain the ball-milled powder; wherein the raw material powder includes aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with an average particle size of 30 nm, and nano-Al2O3 powder with an average particle size of 40 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 8%, and the volume fraction of the nano-Al2O3 powder is 3%. The ball milling treatment is carried out in a high-energy ball mill, the ball-to-material ratio is 20:1, the rotation speed is 350 rpm, and the maximum linear speed is 4.4 m / s. The ball milling mixing treatment time is 8 hours.

[0148] Powder metallurgy sintering treatment: the ball-milled powder is subjected to vacuum hot-press sintering treatment to obtain a sintered composite material; wherein the temperature of the vacuum sintering treatment is 620°C, and the vacuum sintering treatment time is 2 hours.

[0149] Plastic processing treatment: the sintered composite material is subjected to hot extrusion treatment, wherein the temperature of the hot extrusion treatment is 550°C, and the extrusion ratio is 16:1, to obtain the aluminum-based composite material.

[0150] The aluminum-based composite material obtained in this embodiment has excellent strength and toughness and high-temperature resistance. Specifically, the tensile strength of the aluminum-based composite material at 350°C is 220 MPa, the elongation is 5%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the aluminum-based composite material: most of the core-shell structure reinforcing phase particles of amorphous Al2O3 coated TiO2 are located inside the grains, and most of the additional Al2O3 particles are located on the grain boundaries.

[0151] Example 14

[0152] The embodiment prepares an aluminum matrix composite material, which mainly comprises the following steps.

[0153] Ball milling treatment: the raw material powder is subjected to ball milling treatment to obtain the ball-milled powder; wherein the raw material powder comprises aluminum powder with an average particle size of 16 μm, nano-TiO2 powder with a particle size of 20 nm, and nano-Al2O3 powder with a particle size of 40 nm. In the raw material powder, the volume fraction of the nano-TiO2 powder is 8%, and the volume fraction of the nano-Al2O3 powder is 3%. The ball milling treatment is performed in a high-energy ball mill, the ball-to-material ratio is 20:1, the rotation speed is 350 rpm, and the maximum linear speed is 4.4 m / s. The ball milling mixing treatment time is 8 hours.

[0154] Powder metallurgy sintering treatment: the ball-milled powder is subjected to vacuum hot-press sintering treatment to obtain the sintered composite material; wherein the vacuum hot-press sintering treatment temperature is 620°C. The vacuum sintering treatment time is 2 hours.

[0155] Plastic processing treatment: the sintered composite material is subjected to hot extrusion treatment, wherein the hot extrusion treatment temperature is 550°C, and the extrusion ratio is 16:1, to obtain the aluminum matrix composite material.

[0156] The aluminum matrix composite material obtained in the embodiment has excellent strength and toughness and high-temperature resistance. The tensile strength of the aluminum matrix composite material at 350°C is 240 MPa, the elongation is 3%, and the strength does not decrease after annealing at 350°C for 1000 hours. In the aluminum matrix composite material, most of the core-shell structure reinforced phase particles of amorphous Al2O3-coated TiO2 are located inside the grains, and most of the additional Al2O3 particles are located on the grain boundaries.

[0157] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A method for preparing an aluminum-based composite material with grain boundary and intragranular synergistic strengthening, characterized in that: The preparation method of the aluminum-based composite material comprises the following steps: Ball milling and mixing: ball milling the raw material powder to obtain a ball milled powder; wherein the raw material powder comprises aluminum powder, nano-TiO2 powder, and nano-Al2O3 powder; wherein the average particle size of the aluminum powder is 5 to 50 μm; the average particle size of the nano-TiO2 powder is 15 to 40 nm; and the average particle size of the nano-Al2O3 powder is 15 to 50 nm; wherein, in the raw material powder, the volume fraction of the nano-TiO2 powder is 3 to 8%, and the volume fraction of the nano-Al2O3 powder is 1 to 3%; Powder metallurgy sintering treatment: sintering the powder after the ball milling mixing treatment to obtain a sintered composite material; wherein, during the sintering process, Al and TiO2 undergo incomplete reaction, forming an amorphous Al2O3 layer on the surface of the TiO2 particles, forming a core-shell structure reinforcement phase particle with amorphous Al2O3 coating TiO2; wherein, the sintering temperature is 580-645°C and the sintering time is 1-5 hours; Plastic working treatment: The sintered composite material is subjected to plastic working treatment to promote the core-shell structure reinforcement phase particles of amorphous Al2O3 coated TiO2 to enter the interior of the grains to obtain an aluminum-based composite material; wherein the temperature of the plastic working treatment is 520~630℃; and the deformation amount of the plastic working treatment is (6~30):

1.

2. The method for preparing the aluminum-based composite material according to claim 1, wherein: In the step of ball milling and mixing: The ball-to-material weight ratio is 15:1 to 30:1; and / or The maximum linear speed of the grinding balls is greater than 3.5 m / s; and / or The ball milling mixing treatment time is 4 to 20 hours.

3. The method for preparing an aluminum-based composite material with grain boundary and intragranular synergistic strengthening according to claim 1, characterized in that: In the step of the powder metallurgy sintering process: Before sintering, the powder after the ball milling and mixing process needs to be cold pressed to improve the density.

4. The method for preparing an aluminum-based composite material with grain boundary and intragranular synergistic strengthening according to claim 1, characterized in that: In the step of the powder metallurgy sintering process: The sintering process adopts any one of vacuum hot pressing sintering process, hot isostatic pressing sintering process and discharge ion beam sintering process.

5. The method for preparing an aluminum-based composite material with grain boundary and intragranular synergistic strengthening according to claim 1, characterized in that: In the step of plastic working: The plastic working method is any one of forging, rolling and extrusion.

6. An aluminum-based composite material, characterized in that: The microstructure of the aluminum-based composite material includes an Al matrix, core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2, and nano-Al2O3 particles; wherein, at least part of the core-shell structure strengthening phase particles of amorphous Al2O3 coated TiO2 are located inside the grains; at least part of the Al2O3 particles are distributed at the grain boundaries; wherein, the aluminum-based composite material is prepared by the method for preparing an aluminum-based composite material that forms grain boundary and intragranular synergistic strengthening as described in any one of claims 1-5.

7. The aluminum-based composite material according to claim 6, characterized in that: The core-shell structure reinforcement phase particles of amorphous Al2O3 coated TiO2 with a volume fraction of more than 50% are located inside the grains.

8. The aluminum-based composite material according to claim 6, characterized in that: Al2O3 particles with a volume fraction of more than 80% are distributed at the grain boundaries.

9. The aluminum-based composite material according to claim 6, characterized in that: The particle size of the core-shell structure reinforcement phase particles of amorphous Al2O3 coated TiO2 is less than 50nm.

10. The aluminum-based composite material according to claim 6, characterized in that: The microstructure of the aluminum-based composite material further includes Al3Ti particles; wherein the particle size of the Al3Ti particles is less than 1 μm and is distributed in the aluminum matrix.

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