Aluminum alloy strip and preparation method thereof

Abstract

The invention relates to the technical field of aluminum alloy strip preparation, in particular to an aluminum alloy strip and a preparation method thereof. The invention relates to an aluminum alloy strip which consists of the following elements in percentage: 3.85 percent to 4.85 percent of Cu, 1.14 percent to 1.89 percent of Mg, 0.35 percent to 0.88 percent of Mn, 0.01 percent to 0.48 percent of Fe, 0.01 percent to 0.5 percent of Si, 0.01 percent to 0.25 percent of Zn, 0.01 percent to 0.15 percent of Ti and the balance of Al. The composition proportion of the aluminum alloy strip is optimized, the compactness of the aluminum alloy strip is improved by increasing the adding proportion of Cu, Mg and Mn, gaps in an aluminum alloy strip matrix are filled through mixed adding of Cu, Mg and Mn, the compactness of the material is improved, and the mechanical property of the aluminum alloy is further improved in the alloying process.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy strip preparation, and in particular to an aluminum alloy strip and a preparation method thereof. Background Art

[0002] Aluminum alloy strip is a thin sheet material made of aluminum and its alloys, mainly composed of aluminum and other metal elements (such as copper, manganese, magnesium, silicon, zinc, etc.). The addition of these elements can improve the strength, corrosion resistance and processing performance of aluminum. It has the advantages of light weight, high strength, corrosion resistance, good conductivity, easy processing and forming, etc. and is widely used.

[0003] Semi-solid powder rolling of aluminum alloy strip is a new strip preparation process proposed on the basis of aluminum alloy strip powder rolling and semi-solid rolling and with reference to the semi-solid powder extrusion developed in recent years. It aims to develop a new process that combines the short process, near forming and low deformation resistance of semi-solid processing with the precise control of composition and continuous forming characteristics of powder rolling. At the same time, it makes up for their respective shortcomings, so that semi-solid powder rolling has the advantages of short process and near forming.

[0004] In response to the above-mentioned related technologies, the inventors found that although the existing semi-solid powder rolling technology for aluminum alloy strips can reduce the strip preparation process and obtain strips with higher density, fine grains and equiaxed crystal structure, the semi-solid powder rolled strips still contain pores, thereby reducing the mechanical properties of the aluminum alloy strips. Summary of the invention

[0005] In order to improve the defect of poor mechanical properties caused by poor compactness of existing aluminum alloy strips formed by semi-solid powder rolling, the present application provides an aluminum alloy strip and a preparation method thereof.

[0006] In a first aspect, the present application provides an aluminum alloy strip, which adopts the following technical solution:

[0007] An aluminum alloy strip is composed of the following percentage elements: 3.85%-4.85% Cu, 1.14%-1.89% Mg, 0.35%-0.88% Mn, 0.01%-0.48% Fe, 0.01%-0.5% Si, 0.01%-0.25% Zn, 0.01%-0.15% Ti, and the balance is Al.

[0008] Through the above technical scheme, the present application optimizes the composition ratio of the aluminum alloy strip, and improves the compactness of the aluminum alloy strip by increasing the addition ratio of Cu, Mg and Mn. This is because the copper element can effectively improve the mechanical properties of the aluminum alloy strip, and magnesium ensures the stability of the aluminum alloy in a high temperature environment, so that it has excellent high temperature resistance in a high temperature treatment environment. Finally, the present application forms a strengthening phase by adding manganese (Mn) as an alloying element, and fills the gaps in the aluminum alloy strip matrix through the mixed addition of Cu, Mg and Mn, thereby improving the density of the material. This alloying process further improves the mechanical properties of the aluminum alloy.

[0009] Furthermore, the modifier includes porous carbide composite particles.

[0010] Through the above technical solution, the present application adds porous carbide composite particles as a modifier in the aluminum alloy strip. Since the addition of porous carbide composite particles can form an effective load transfer channel, the compressive strength and toughness of the material are improved, thereby improving its wear resistance. In addition, the porous carbide material can form a continuous filling skeleton structure inside the aluminum alloy strip, effectively reducing the thermal expansion and heat conduction of the material, while further refining the grain size inside the aluminum alloy strip to improve its density and mechanical properties.

[0011] Furthermore, the mass ratio of the added amount of the modifier to Cu is (2.5-2.8):1.

[0012] Furthermore, the porous carbide composite particles include at least one of porous TiC-TiB2 or porous SiC-TiC-TiB2 composite particles.

[0013] Furthermore, the porous carbide composite particles are porous SiC-TiC-TiB2 composite particles, and the porous SiC-TiC-TiB2 composite particles are made by the following technical solution:

[0014] Ti, B4C and Si are mixed and ball-milled, and the mixed powder is collected;

[0015] The mixed powder is stirred and mixed with CNTs, and anhydrous ethanol is added, stirred and mixed, and wet-grinded. The mixture is collected and placed in a mold, and after sintering, it is allowed to stand and cool to room temperature, crushed, ground and sieved to prepare the porous SiC-TiC-TiB2 composite particles.

[0016] Through the above technical scheme, the present application selects porous SiC-TiC-TiB2 composite particles as the main modified material. On the one hand, the porous SiC-TiC-TiB2 composite particles as non-metallic inclusions can effectively refine the grains of aluminum alloy and improve the grain boundary characteristics of aluminum alloy strips. The distribution of titanium carbide and titanium boride particles at the grain boundaries can enhance the bonding force of the grain boundaries, inhibit the slip and diffusion of the grain boundaries, and help maintain the strength and toughness of the alloy at high temperatures. On the other hand, the present application helps to improve the tensile strength and ductility of the alloy and reduce brittleness through the fine and uniform grain structure of the added modifier itself, so that the aluminum alloy strip exhibits better mechanical properties in practical applications.

[0017] Furthermore, the modifier also includes yttrium oxide particles, and the mixing ratio of the yttrium oxide particles to the porous carbide composite particles is (1-2): (15-18).

[0018] Further, the modifier is prepared by the following scheme:

[0019] Y2O3, Ti, B4C and Si are mixed and ball-milled, and the mixed powder is collected;

[0020] The mixed powder is stirred and mixed with CNTs, and anhydrous ethanol is added, stirred and mixed, and wet-grinded. The mixture is collected and placed in a mold, and after sintering, it is allowed to stand and cool to room temperature, and then crushed, ground and sieved to prepare the porous SiC-TiC-TiB2 composite particles.

[0021] Furthermore, the sintering temperature is 1250-1450°C.

[0022] Through the above technical scheme, the present application selects yttrium oxide material to further modify the aluminum alloy strip. On the one hand, the addition of yttrium oxide can further refine the grains, improve the density of the aluminum alloy strip, reduce the impurities at the grain boundaries, and improve the mechanical properties of the aluminum alloy strip; on the other hand, yttrium oxide is used as a bonding material between the modifier material and the surface of the aluminum alloy strip matrix, thereby improving its bonding strength and compatibility, thereby further improving the density and mechanical strength of the aluminum alloy strip.

[0023] In a second aspect, the present application provides a method for preparing an aluminum alloy strip, which adopts the following technical solution:

[0024] A method for preparing an aluminum alloy strip comprises the following preparation steps:

[0025] Take the raw material components in the formula and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them and keep them warm for 30-45 minutes.

[0026] The heat-insulating powder is taken and placed in a rolling roller, heated and heat-insulated and rolled to form in an inert atmosphere, so as to prepare the aluminum alloy strip.

[0027] Furthermore, the temperature of the heating and heat preservation treatment is 550-600°C.

[0028] Through the above technical scheme, the present application optimizes the preparation method of aluminum alloy strip by making the internal structure of the material more uniform, reducing the number of second phase particles, improving the grain boundary structure, and improving the compactness of the aluminum alloy strip. At the same time, under the action of aging, the structure of the precipitated phase is further improved, thereby improving the mechanical properties of the aluminum alloy strip.

[0029] In summary, this application has the following beneficial effects:

[0030] First, the present application optimizes the composition ratio of the aluminum alloy strip and improves the compactness of the aluminum alloy strip by increasing the addition ratio of Cu, Mg and Mn. This is because the copper element can effectively improve the mechanical properties of the aluminum alloy strip, and magnesium ensures the stability of the aluminum alloy in a high temperature environment, so that it has excellent high temperature resistance in a high temperature treatment environment. Finally, the present application forms a strengthening phase by adding manganese (Mn) as an alloying element. By adding a mixture of Cu, Mg and Mn, the gaps in the aluminum alloy strip matrix are filled and the density of the material is improved. This alloying process further improves the mechanical properties of the aluminum alloy.

[0031] Second, the present application adds porous carbide composite particles as a modifier in the aluminum alloy strip. Since the addition of porous carbide composite particles can form an effective load transfer channel, the compressive strength and toughness of the material are improved, thereby improving its wear resistance. In addition, the porous carbide material can form a continuous filling skeleton structure inside the aluminum alloy strip, effectively reducing the thermal expansion and heat conduction of the material, while further refining the grain size inside the aluminum alloy strip to improve its density and mechanical properties.

[0032] Third, the present application selects porous SiC-TiC-TiB2 composite particles as the main modified material. On the one hand, the porous SiC-TiC-TiB2 composite particles as non-metallic inclusions can effectively refine the grains of the aluminum alloy and improve the grain boundary characteristics of the aluminum alloy strip. The distribution of titanium carbide and titanium boride particles at the grain boundaries can enhance the bonding force of the grain boundaries, inhibit the slip and diffusion of the grain boundaries, and help maintain the strength and toughness of the alloy at high temperatures. On the other hand, the present application helps to improve the tensile strength and ductility of the alloy and reduce brittleness through the fine and uniform grain structure of the added modifier itself, so that the aluminum alloy strip exhibits better mechanical properties in practical applications.

[0033] Fourth, the present application uses yttrium oxide material to further modify the aluminum alloy strip. On the one hand, the addition of yttrium oxide can further refine the grains, improve the density of the aluminum alloy strip, reduce grain boundary impurities, and improve the mechanical properties of the aluminum alloy strip; on the other hand, yttrium oxide serves as a bonding material between the modifier material and the surface of the aluminum alloy strip matrix, improving its bonding strength and compatibility, thereby further improving the density and mechanical strength of the aluminum alloy strip. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the embodiments.

[0035] In the examples of the present application, the raw materials and instruments used are as follows, but not limited thereto. Raw materials not otherwise described are of analytical grade:

[0036] Preparation Example 1

[0037] Modifier 1

[0038] 300 g Ti, 60 g B4C and 25 g Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0039] 300 g of the mixed powder was stirred and mixed with 45 g of CNTs, 200 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1250° C., allowed to stand and cool to room temperature, crushed and ground through a 1000 mesh sieve, and the porous SiC-TiC-TiB2 composite particles 1 as modifier 1 were prepared.

[0040] Preparation Example 2

[0041] Modifier 2

[0042] 400 g Ti, 70 g B4C and 42 g Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0043] 300 g of mixed powder was stirred and mixed with 62 g of CNTs, 250 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1375° C., allowed to stand and cool to room temperature, crushed and ground through a 1000 mesh sieve, and the porous SiC-TiC-TiB2 composite particles 2 as modifier 2 were prepared.

[0044] Preparation Example 3

[0045] Modifier 3

[0046] 500 g Ti, 80 g B4C and 60 g Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0047] 300 g of mixed powder was stirred and mixed with 90 g of CNTs, 300 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1450° C., allowed to stand and cool to room temperature, crushed and ground through a 1000 mesh sieve, and the porous SiC-TiC-TiB2 composite particles 3 as modifier 3 were prepared.

[0048] Preparation Example 4

[0049] Modifier 4

[0050] 8.44-20.27 g of yttrium oxide particles, 400 g of Ti, 70 g of B4C and 42 g of Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0051] 300 g of the mixed powder was stirred and mixed with 62 g of CNTs, 250 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1300° C., allowed to stand and cool to room temperature, crushed and ground through a 1000-mesh sieve, and modifier 4 was prepared.

[0052] Preparation Example 5

[0053] Modifier 4

[0054] 8.44-20.27 g of yttrium oxide particles, 400 g of Ti, 70 g of B4C and 42 g of Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0055] 300 g of the mixed powder was stirred and mixed with 62 g of CNTs, and 250 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min. The mixture was collected and placed in a mold, sintered at 1300° C., allowed to stand and cool to room temperature, crushed and ground through a 1000-mesh sieve, and modifier 5 was prepared.

[0056] Preparation Example 6

[0057] Modifier 4

[0058] 8.44-20.27 g of yttrium oxide particles, 400 g of Ti, 70 g of B4C and 42 g of Si were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0059] 300 g of the mixed powder was stirred and mixed with 62 g of CNTs, 250 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1300° C., allowed to stand and cool to room temperature, crushed and ground through a 1000-mesh sieve, and modifier 6 was prepared.

[0060] Preparation Example 7

[0061] Modifier 7

[0062] 300 g Ti and 100 g B4C were mixed and ball-milled for 1 h, and the mixed powder was collected;

[0063] 300 g of mixed powder was stirred and mixed with 62 g of CNTs, 250 mL of anhydrous ethanol was added, stirred and mixed, and wet-milled for 30 min, the mixture was collected and placed in a mold, sintered at 1375° C., allowed to stand and cool to room temperature, crushed and ground through a 1000 mesh sieve, and the porous TiC-TiB2 composite particles 2 as the modifier 7 were prepared.

[0064] Embodiment 1-6 The following is described by taking Embodiment 1-3 as an example:

[0065] Example 1

[0066] An aluminum alloy strip comprises the following preparation steps:

[0067] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 550°C and keep them warm for 30 minutes.

[0068] Take the insulation powder and place it in a rolling roller, heat it to 450°C and heat-roll it in an argon atmosphere, control the rolling deformation to 35%, perform solid solution treatment at 400°C for 40 minutes, and then age at 170°C for 12 hours to prepare the aluminum alloy strip.

[0069] Example 2

[0070] An aluminum alloy strip comprises the following preparation steps:

[0071] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 575°C and keep them warm for 38 minutes.

[0072] Take the insulation powder and place it in a rolling roller, heat it to 475°C and heat-roll it in an argon atmosphere, control the rolling deformation to 40%, perform solid solution treatment at 475°C for 50 minutes, and then age at 178°C for 13 hours to prepare the aluminum alloy strip.

[0073] Example 3

[0074] An aluminum alloy strip comprises the following preparation steps:

[0075] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 600°C and keep them warm for 45 minutes.

[0076] Take the insulation powder and place it in a rolling roller, heat it to 500°C and heat-roll it in an argon atmosphere, control the rolling deformation to 45%, perform solid solution treatment at 550°C for 60 minutes, and then age at 185°C for 15 hours to prepare the aluminum alloy strip.

[0077] Example 4

[0078] An aluminum alloy strip comprises the following preparation steps:

[0079] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 575°C and keep them warm for 38 minutes.

[0080] Take the insulation powder and place it in a rolling roller, heat it to 475°C and heat-roll it in an argon atmosphere, control the rolling deformation to 40%, perform solid solution treatment at 475°C for 50 minutes, and then age at 178°C for 13 hours to prepare the aluminum alloy strip.

[0081] Example 5

[0082] An aluminum alloy strip comprises the following preparation steps:

[0083] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 575°C and keep them warm for 38 minutes.

[0084] Take the insulation powder and place it in a rolling roller, heat it to 475°C and heat-roll it in an argon atmosphere, control the rolling deformation to 40%, perform solid solution treatment at 475°C for 50 minutes, and then age at 178°C for 13 hours to prepare the aluminum alloy strip.

[0085] Example 6

[0086] An aluminum alloy strip comprises the following preparation steps:

[0087] Take the raw material components in the formula of Table 1 and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them to 575°C and keep them warm for 38 minutes.

[0088] Take the insulation powder and place it in a rolling roller, heat it to 475°C and heat-roll it in an argon atmosphere, control the rolling deformation to 40%, perform solid solution treatment at 475°C for 50 minutes, and then age at 178°C for 13 hours to prepare the aluminum alloy strip.

[0089] Table 1 Group distribution ratio table

[0090]

[0091]

[0092] Example 7

[0093] The difference from Example 2 is that in Example 7, 9.75 g of modifier 1 is further added.

[0094] Example 8

[0095] The difference from Example 2 is that in Example 10, 10.92 g of modifier 1 is further added.

[0096] Example 9

[0097] The difference from Example 2 is that 9.75 g of modifier 2 is also added in Example 10.

[0098] Example 10

[0099] The difference from Example 2 is that 9.75 g of modifier 3 is also added in Example 11.

[0100] Embodiment 11

[0101] The difference from Example 2 is that in Example 12, 9.75 g of modifier 4 is also added.

[0102] Example 12

[0103] The difference from Example 2 is that in Example 13, 9.75 g of modifier 5 is further added.

[0104] Embodiment 13

[0105] The difference from Example 2 is that in Example 14, 9.75 g of modifier 6 is further added.

[0106] Embodiment 14

[0107] The difference from Example 2 is that in Example 15, 9.75 g of modifier 7 is further added.

[0108] Performance Testing

[0109] The aluminum alloy strips prepared in Examples 1-14 were subjected to performance tests, specifically testing their density and tensile strength:

[0110] (1) Density: The density of aluminum alloy strip is measured and calculated by Archimedes drainage method. Since the sample contains certain holes, the surface of the sample is sealed with wax before the density test. The mass of the sample is weighed by Sartorius / BS224B electronic balance with an accuracy of 0.0001g. Three samples are taken for measurement under the same parameters, and the average of the final calculated values ​​is taken as the final density of the sample under this condition.

[0111] The actual density of the rolled strip ρactual (g / cm3) can be calculated using the following calculation formula 2-1: ρ 实际 ≈m1 / (m2-m3)ρ 水 .

[0112] Where: m1 is the mass of the strip measured in the air before wax sealing, in g;

[0113] m2 is the mass of the strip after wax sealing measured in the air, in g;

[0114] m3 is the mass of the strip after wax sealing measured in distilled water, in g;

[0115] ρ 水 is the density of distilled water, take 1g / cm 3 .

[0116] The calculation formula of the density ρ (i.e. relative density) of the strip is shown in 2-2:

[0117] ρ=ρ 实际 / ρ 理论 ×100%

[0118] According to the aluminum alloy and processing manual, the theoretical density of aluminum alloy is 2.77g / cm 3 .

[0119] (2) Tensile strength:

[0120] The room temperature tensile performance test was carried out on an MT5105 microcomputer-controlled electronic universal testing machine. During the tensile test, a Φ3 pin was used to fix the tensile specimen, and the tensile rate was 0.5mm / min. In order to ensure the accuracy of the data, 3 tensile specimens were processed under each parameter, and the average value of the tensile test data was used as the final result. In order to prevent the fracture surface from oxidation and contamination after the strip specimen was stretched, the observation and analysis of the fracture morphology was generally carried out within 2 days after the tensile test. The recorded results are shown in Table 1 below:

[0121] Table 1 Performance test table

[0122] sample Density ρ / % Tensile strength / MPa Example 1 90.5 402.6 Example 2 91.1 403.8 Example 3 91.8 404.2 Example 4 92.3 405.5 Example 5 91.9 404.9 Example 6 91.8 404.8 Example 7 92.5 411.1 Example 8 92.8 409.8 Example 9 92.6 415.4 Example 10 93.5 415.3 Embodiment 11 94.3 418.4 Example 12 95.6 420.3 Embodiment 13 94.8 419.4 Embodiment 14 93.2 418.8

[0123] From the above-mentioned Examples 1-6, Examples 7-10, Examples 11-13 and Example 14, combined with the test results of Table 1, it can be found that:

[0124] The technical solutions of Examples 1-6 further illustrate that the technical solution of the present application improves the density of the aluminum alloy strip by optimizing the composition ratio of the aluminum alloy strip and increasing the addition ratio of Cu, Mg and Mn, thereby improving the density of the material. This alloying process further improves the mechanical properties of the aluminum alloy.

[0125] Comparing Examples 1-6, Examples 7-10 and Example 14, it is shown that the technical solution of the present application adds porous carbide composite particles as a modifier to the aluminum alloy strip and selects porous SiC-TiC-TiB2 composite particles as the main modified material, which helps to improve the tensile strength and ductility of the alloy, reduce the brittleness, and make the aluminum alloy strip exhibit better mechanical properties in practical applications.

[0126] Finally, examples 7-10 are compared with examples 11-13 to illustrate that the technical solution of the present application uses yttrium oxide material to further modify the aluminum alloy strip, thereby improving the density of the aluminum alloy strip, reducing grain boundary impurities, and improving the mechanical properties of the aluminum alloy strip; at the same time, yttrium oxide is used as a modifier material and a bonding material with the surface of the aluminum alloy strip matrix to improve its bonding strength and compatibility, thereby further improving the density and mechanical strength of the aluminum alloy strip.

[0127] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0128] All publications, patent applications, patents and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings conventionally understood by those skilled in the art. In the event of a conflict, the definition in this specification shall prevail.

[0129] When this specification uses the prefix "well-known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, etc., the objects introduced by the prefix cover those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become recognized in the art as being suitable for similar purposes.

[0130] In the context of the present specification, any matters or items not mentioned are directly applicable to those known in the art without any changes except those explicitly stated.

Claims

1. An aluminum alloy strip, characterized in that: It is composed of the following percentage elements:

2. The aluminum alloy strip according to claim 1, characterized in that: The aluminum alloy strip is further added with a modifier, wherein the modifier includes porous carbide composite particles.

3. The aluminum alloy strip according to claim 1, characterized in that: The mass ratio of the added amount of the modifier to Cu is (2.5-2.8):

1.

4. The aluminum alloy strip according to claim 2, characterized in that: The porous carbide composite particles include at least one of porous TiC-TiB2 or porous SiC-TiC-TiB2 composite particles.

5. The aluminum alloy strip according to claim 4, characterized in that: The porous carbide composite particles are porous SiC-TiC-TiB2 composite particles, and the porous SiC-TiC-TiB2 composite particles are made by the following technical scheme: Ti, B4C and Si are mixed and ball-milled, and the mixed powder is collected; The mixed powder is stirred and mixed with CNTs, and anhydrous ethanol is added, stirred and mixed, and wet-grinded. The mixture is collected and placed in a mold, and after sintering, it is allowed to stand and cool to room temperature, and then crushed, ground and sieved to prepare the porous SiC-TiC-TiB2 composite particles.

6. The aluminum alloy strip according to claim 4, characterized in that: The modifier further comprises yttrium oxide particles, and the mixing ratio of the yttrium oxide particles to the porous carbide composite particles is (1-2): (15-18).

7. The aluminum alloy strip according to claim 6, characterized in that: The modifier is prepared by the following scheme: Y2O3, Ti, B4C and Si are mixed and ball-milled, and the mixed powder is collected; The mixed powder is stirred and mixed with CNTs, and anhydrous ethanol is added, stirred and mixed, and wet-grinded. The mixture is collected and placed in a mold, and after sintering, it is allowed to stand and cool to room temperature, and then crushed, ground and sieved to prepare the porous SiC-TiC-TiB2 composite particles.

8. The aluminum alloy strip according to claim 7, characterized in that: The sintering temperature is 1250-1450°C.

9. The method for preparing an aluminum alloy strip according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: Take the raw material components in the formula and mix them with the modifier and place them in a powder mixer. Mix the materials and place them in a vacuum drying device. Heat them and keep them warm for 30-45 minutes. The heat-insulating powder is taken and placed in a rolling roller, heated and heat-insulated and rolled in an inert atmosphere, solution treated at 400-550° C. for 40-60 minutes, and then aged at 170-185° C. for 12-15 hours to prepare the aluminum alloy strip.

10. The method for preparing an aluminum alloy strip according to claim 9, characterized in that: The temperature of the heating and heat preservation treatment is 550-600°C.

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