Method for preparing particle reinforced gradient structure material through double-roller casting and rolling

Abstract

The invention discloses a method for preparing a particle reinforced gradient structure material through double-roller casting and rolling. The preparation method comprises the following four steps: preparing an aluminum alloy melt, adding nucleating agent particles, carrying out double-roller cast rolling, rolling and carrying out heat treatment. The particle reinforced composite material obtained through the steps has a grain size and phase distribution double-gradient structure; important technical support can be provided for production of gradient structure aluminum alloy plates.

Description

Technical Field

[0001] The present invention relates to the technical field of preparing gradient structure materials, and more specifically, to a method for preparing particle-enhanced gradient structure materials by twin-roll casting. Background Art

[0002] Gradient structure refers to the gradual change of microstructural features from the surface to the depth. In single-phase materials, it is mainly manifested as a gradient of grain boundary density, including grain size, thin film thickness and twin thickness; in dual-phase or multi-phase materials, it is mainly manifested as a gradient of phase distribution (including strengthening phase, precipitation phase, etc.). Traditional methods for preparing gradient structures require complex process steps and strict preparation conditions, such as free-end torsion, cumulative rolling, laser cladding, etc. Twin-roll casting technology combines casting and rolling processes into one, and only requires a small amount of subsequent rolling and heat treatment processes to produce near-net-shape products, thereby significantly improving production efficiency and reducing energy consumption. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a particle-reinforced gradient structure material by twin-roll casting and rolling, which is designed to overcome the shortcomings of the prior art. Through the twin-roll casting and rolling process, a dual gradient distribution of grain size and strengthening phase is achieved in the hypoeutectic aluminum alloy, and the eutectic strengthening phase content in the near-surface area is higher than that in the central area. The addition of nucleating agent particles reduces the agglomeration phenomenon of the eutectic strengthening phase, and forms a uniformly dispersed strengthening phase enrichment area near the surface. Due to the presence of the gradient structure, the load transfer and back stress strengthening effects in the near-surface area of ​​the plate are enhanced, which can ultimately increase the strength of the near-surface area of ​​the plate and maintain a high plasticity.

[0004] The technical solution provided by the present invention is:

[0005] A method for preparing a particle-enhanced gradient structure material by twin-roll casting, comprising:

[0006] Step 1, preparing an aluminum alloy melt and adding nucleating agent particles;

[0007] Step 2, the obtained melt is cast into an alloy plate by twin-roll casting;

[0008] Step 3, rolling the alloy plate obtained by twin-roll casting;

[0009] Step 4, heat treating the rolled plate;

[0010] Preferably, the aluminum alloy is a hypoeutectic alloy;

[0011] Preferably, the nucleating agent includes TiC particles, TiB2 particles and a mixture of the two, and the addition amount is 0.1-0.8% by mass;

[0012] Preferably, the step 1 specifically comprises:

[0013] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain molten aluminum alloy, and keeping the temperature for 10-20 minutes;

[0014] (2) adding a nucleating agent aluminum-based master alloy to the melt, mechanically stirring for 1-2 minutes, and then ultrasonically treating;

[0015] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0016] Wherein, the mass fraction of the nucleating agent in the aluminum-based master alloy is 20-40%;

[0017] Preferably, the step 2 specifically includes:

[0018] The prepared alloy melt is poured onto a casting roll with a water cooling system, and is formed into an alloy plate by twin-roll casting;

[0019] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0020] Preferably, the step 3 specifically includes:

[0021] Since the alloy sheet is prone to cracks during the twin-roll casting process, the sheet obtained by twin-roll casting is rolled after solution treatment for 1-3 hours;

[0022] Among them, the rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction is 60-70%;

[0023] Preferably, the step 4 specifically includes:

[0024] The rolled plate is placed in a nitrogen oven and the oven temperature is raised to a temperature close to the eutectic point, kept at this temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled;

[0025] The beneficial effects of the present invention are:

[0026] Compared with the prior art, the technical concept and corresponding technical solution of the present invention can at least achieve the following beneficial technical effects:

[0027] The improved rolling method of the present invention significantly improves the problem of cracks being easily generated during twin-roll casting. The method of the present invention is easy to operate, low in cost and high in production efficiency. The particle-reinforced gradient structure plate prepared by the method has a gradient distribution of internal grain size and strengthening phase, a small grain size in the near-surface region, a high grain boundary density and a dense distribution of strengthening phase.

[0028] The preparation method reported in the present invention can be applied to particle-reinforced hypoeutectic aluminum alloys, such as Al-Cu (Cu element mass fraction is 5-15%), Al-Si (Si element mass fraction is 5-10%), etc. Therefore, this method of preparing particle-reinforced gradient structure materials by twin-roll casting has very broad practical application potential. The present invention can provide important technical support for the production of high-performance cast-rolled aluminum alloy plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the twin-roll casting process of the present invention;

[0030] Figure 2 It is the process flow chart of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the comparative example 1 of the present invention, i.e., the Al-10Cu alloy plate without adding TiC particles;

[0032] Figure 4 This is a schematic diagram of the structure of the comparative example 1 of the present invention, i.e., an Al-10Cu alloy plate with 0.5 wt% TiC particles added; DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Comparative Example 1

[0035] In this comparative example, an Al2Cu / Al gradient structure material was prepared by twin-roll casting, the matrix alloy composition was Al-10Cu, and no nucleating agent particles were added. The mass percentages of the components in the Al-10Cu alloy melt were: Cu: 9.5-10.5%, and the balance was Al;

[0036] The specific preparation method comprises the following steps:

[0037] Step 1: Prepare Al-10Cu alloy melt:

[0038] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-Cu alloy, and keeping the temperature for 10-20 minutes;

[0039] (2) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0040] Step 2: The Al-10Cu melt is cast into alloy plates by twin-roll casting:

[0041] The prepared Al-10Cu alloy melt is poured onto a casting roll with a water cooling system, and an Al-10Cu alloy sheet is produced by twin-roll casting.

[0042] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0043] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0044] Since Al-10Cu alloy is prone to cracks during twin-roll casting, the Al-10Cu sheet obtained by twin-roll casting is hot rolled after solution treatment for 1-3 hours.

[0045] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0046] Step 4: heat treat the rolled plate:

[0047] The rolled Al-10Cu sheet was placed in a nitrogen oven and heated to a temperature close to the eutectic point (530-540°C), kept at that temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

[0048] The final organization is Figure 3 As shown, the eutectic strengthening phase is distributed in a gradient from the surface to the core, the surface eutectic phase area accounts for 19.6%, and the aggregation is serious. The mechanical properties of the Al-10Cu alloy sheet after heat treatment were tested: the Al-10Cu alloy sheet without the addition of nano-TiC particles has a room temperature yield strength of 259MPa, a tensile strength of 400MPa, and a uniform elongation of 7.8%.

[0049] Comparative Example 2

[0050] In this embodiment, an Al2Cu / Al gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-10Cu-0.5TiC. The mass percentage of each component in the Al-10Cu-0.5TiC alloy melt is: Cu: 9.5-10.5%, TiC: 0.45-0.55%, and the balance is Al;

[0051] The specific preparation method comprises the following steps:

[0052] Step 1: Prepare Al-10Cu alloy melt and add nano-TiC particles:

[0053] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-10Cu alloy, and keeping the temperature for 10-20 minutes;

[0054] (2) adding nano-TiC particles to the molten Al-10Cu alloy to form an aluminum-based master alloy, stirring mechanically for 1-2 minutes, and then performing ultrasonic treatment;

[0055] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0056] Step 2: The Al-10Cu-0.5TiC melt is cast into an alloy plate by twin-roll casting:

[0057] The prepared Al-10Cu-0.5TiC alloy melt is poured onto a casting roll with a water cooling system, and an Al-10Cu-0.5TiC alloy sheet is produced by twin-roll casting.

[0058] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0059] Step 3: cold rolling the rolled plate, with a single-pass reduction of 60%. The plate cracks severely and cannot meet production requirements.

[0060] Example 1

[0061] In this embodiment, an Al2Cu / Al gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-10Cu-0.5TiC. The mass percentage of each component in the Al-10Cu-0.5TiC alloy melt is: Cu: 9.5-10.5%, TiC: 0.45-0.55%, and the balance is Al;

[0062] The specific preparation method comprises the following steps:

[0063] Step 1: Prepare Al-10Cu alloy melt and add nano-TiC particles:

[0064] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-10Cu alloy, and keeping the temperature for 10-20 minutes;

[0065] (2) adding nano-TiC particles to the molten Al-10Cu alloy to form an aluminum-based master alloy, stirring mechanically for 1-2 minutes, and then performing ultrasonic treatment;

[0066] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0067] Step 2: The Al-10Cu-0.5TiC melt is cast into an alloy plate by twin-roll casting:

[0068] The prepared Al-10Cu-0.5TiC alloy melt is poured onto a casting roll with a water cooling system, and an Al-10Cu-0.5TiC alloy sheet is produced by twin-roll casting.

[0069] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0070] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0071] Since Al-10Cu-0.5TiC alloy is prone to cracks during twin-roll casting, the Al-10Cu-0.5TiC sheet obtained by twin-roll casting is hot rolled after solutionizing for 1-3 hours.

[0072] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0073] Step 4: heat treat the rolled plate:

[0074] The rolled Al-10Cu-0.5TiC plate was placed in a nitrogen oven and heated to a temperature close to the eutectic point (530-540°C), kept at that temperature for 1-3 hours, then quenched, then taken out, kept at 160-165°C for 8-10 hours, and air-cooled.

[0075] Mechanical properties of the Al-10Cu-0.5TiC alloy sheet after heat treatment were tested: the Al-10Cu alloy sheet after adding 0.5% by mass of nano-TiC particles had a room temperature yield strength of 263MPa, a tensile strength of 426MPa, and a uniform elongation of 10.9%. The mechanical properties test results show that the uniform elongation of the sheet in this embodiment is 40% higher than that of the sheet without TiC particles in Comparative Example 1. The microstructure of the sheet in this embodiment is as follows: Figure 4 As shown, it can be seen that after adding 0.5% by mass of nano-TiC particles, the aggregation phenomenon of the eutectic phase is effectively improved, and a uniform and dense reinforcement phase distribution is obtained in the near-surface area.

[0076] Example 2

[0077] In this embodiment, an Al2Cu / Al gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-10Cu-0.5TiB2. The mass percentages of the components in the Al-10Cu-0.5TiB2 alloy melt are: Cu: 9.5-10.5%, TiB2: 0.45-0.55%, and the balance is Al;

[0078] The specific preparation method comprises the following steps:

[0079] Step 1: Prepare Al-10Cu alloy melt and add nano-TiB2 particles:

[0080] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-10Cu alloy, and keeping the temperature for 10-20 minutes;

[0081] (2) adding nano-TiB2 particles to the molten Al-10Cu alloy to form an aluminum-based master alloy, mechanically stirring for 1-2 minutes and then ultrasonically treating;

[0082] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0083] Step 2: The Al-10Cu-0.5TiB2 melt is cast into an alloy plate by twin-roll casting:

[0084] The prepared Al-10Cu-0.5TiB2 alloy melt is poured onto a casting roll with a water cooling system, and an Al-10Cu-0.5TiB2 alloy sheet is produced by twin-roll casting;

[0085] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0086] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0087] Since Al-10Cu-0.5TiB2 alloy is prone to cracks during twin-roll casting, the Al-10Cu-0.5TiB2 sheet obtained by twin-roll casting is hot rolled after solution treatment for 1-3 hours.

[0088] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0089] Step 4: heat treat the rolled plate:

[0090] The rolled Al-10Cu-0.5TiB2 sheet was placed in a nitrogen oven and heated to a temperature close to the eutectic point (530-540°C), kept at that temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

[0091] Finally, Al-10Cu-0.5TiB2 sheet with eutectic Al2Cu and grain size gradient distribution was obtained.

[0092] Example 3

[0093] In this embodiment, an Al2Cu / Al gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-8Cu-0.5TiC. The mass percentages of the components in the Al-8Cu-0.5TiC alloy melt are: Cu: 7.5-9.5%, TiC: 0.45-0.55%, and the balance is Al;

[0094] The specific preparation method comprises the following steps:

[0095] Step 1: Prepare Al-8Cu alloy melt and add nano-TiC particles:

[0096] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-8Cu alloy, and keeping the temperature for 10-20 minutes;

[0097] (2) adding nano-TiC particles to the molten Al-8Cu alloy to form an aluminum-based master alloy, stirring mechanically for 1-2 minutes, and then performing ultrasonic treatment;

[0098] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0099] Step 2: The Al-8Cu-0.5TiC melt is cast into an alloy plate by twin-roll casting:

[0100] The prepared Al-8Cu-0.5TiC alloy melt is poured onto a casting roll with a water cooling system, and an Al-8Cu-0.5TiC alloy sheet is produced by twin-roll casting.

[0101] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0102] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0103] Since Al-8Cu-0.5TiC alloy is prone to cracks during twin-roll casting, the Al-8Cu-0.5TiC sheet obtained by twin-roll casting is hot rolled after solution treatment for 1-3 hours.

[0104] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0105] Step 4: heat treat the rolled plate:

[0106] The rolled Al-8Cu-0.5TiC plate was placed in a nitrogen oven and heated to a temperature close to the eutectic point (530-540°C), kept at that temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

[0107] Finally, Al-8Cu-0.5TiC sheet with gradient distribution of eutectic Al2Cu and grain size was obtained.

[0108] Example 4

[0109] In this embodiment, a particle-enhanced gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-7Si-0.5TiC. The mass percentages of the components in the Al-7Si-0.5TiC alloy melt are: Si: 6.5-8.5%, TiC: 0.45-0.55%, and the balance is Al;

[0110] The specific preparation method comprises the following steps:

[0111] Step 1: Prepare Al-7Si alloy melt and add nano-TiC particles:

[0112] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-7Si alloy, and keeping the temperature for 10-20 minutes;

[0113] (2) adding nano-TiC particles to the molten Al-7Si alloy to form an aluminum-based master alloy, mechanically stirring for 1-2 minutes and then ultrasonically treating;

[0114] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0115] Step 2: The Al-7Si-0.5TiC melt is cast into an alloy plate by twin-roll casting:

[0116] The prepared Al-7Si-0.5TiC alloy melt is poured onto a casting roll with a water cooling system, and an Al-7Si-0.5TiC alloy sheet is produced by twin-roll casting.

[0117] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0118] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0119] Since Al-7Si-0.5TiC alloy is prone to cracks during twin-roll casting, the Al-7Si-0.5TiC sheet obtained by twin-roll casting is hot rolled after solution treatment for 1-3 hours.

[0120] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0121] Step 4: heat treat the rolled plate:

[0122] The rolled Al-7Si-0.5TiC plate was placed in a nitrogen oven and heated to a temperature close to the eutectic point (560-570°C), kept at that temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

[0123] Finally, Al-7Si-0.5TiC plates with gradient distribution of eutectic silicon and grain size were obtained.

[0124] Example 5

[0125] In this embodiment, a particle-enhanced gradient structure material is prepared by twin-roll casting, and the matrix alloy composition is Al-7Si-0.5TiB2. The mass percentages of the components in the Al-7Si-0.5TiB2 alloy melt are: Si: 6.5-8.5%, TiB2: 0.45-0.55%, and the balance is Al;

[0126] The specific preparation method comprises the following steps:

[0127] Step 1: Prepare Al-7Si alloy melt and add nano-TiB2 particles:

[0128] (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain a molten Al-7Si alloy, and keeping the temperature for 10-20 minutes;

[0129] (2) adding nano-TiB2 particles to the molten Al-7Si alloy to form an aluminum-based master alloy, mechanically stirring for 1-2 minutes and then ultrasonically treating;

[0130] (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag;

[0131] Step 2: The Al-7Si-0.5TiB2 melt is cast into an alloy plate by twin-roll casting:

[0132] The prepared Al-7Si-0.5TiB2 alloy melt is poured onto a casting roll with a water cooling system, and an Al-7Si-0.5TiB2 alloy sheet is produced by twin-roll casting;

[0133] The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm.

[0134] Step 3: hot rolling the alloy plate obtained by twin-roll casting:

[0135] Since Al-7Si-0.5TiB2 alloy is prone to cracks during twin-roll casting, the Al-7Si-0.5TiB2 sheet obtained by twin-roll casting is hot rolled after solution treatment for 1-3 hours.

[0136] The hot rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction should be 60-70%;

[0137] Step 4: heat treat the rolled plate:

[0138] The rolled Al-7Si-0.5TiB2 sheet was placed in a nitrogen oven and heated to a temperature close to the eutectic point (560-570°C), kept at that temperature for 1-3 hours, then quenched, then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

[0139] Finally, Al-7Si-0.5TiB2 sheets with gradient distribution of eutectic silicon and grain size were obtained.

[0140] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a particle-enhanced gradient structure material by twin-roll casting, characterized in that: include: Step 1, preparing an aluminum alloy melt and adding nucleating agent particles; Step 2, the obtained melt is cast into an alloy plate by twin-roll casting; Step 3, rolling the alloy plate obtained by twin-roll casting; Step 4: heat-treating the rolled plate.

2. The method for preparing a particle-reinforced gradient structure material by twin-roll casting as claimed in claim 1, characterized in that: The aluminum alloy is a hypoeutectic alloy, such as a binary or multi-component alloy such as Al-Cu and Al-Si alloys.

3. The method for preparing a particle-reinforced gradient structure material by twin-roll casting as claimed in claim 1, characterized in that: The nucleating agent includes TiC particles, TiB2 particles and a mixture of the two, and the added amount is 0.1-0.8% by mass.

4. The method for preparing a particle-reinforced gradient structure material by twin-roll casting as claimed in claim 1, characterized in that: The specific steps include: Step 1: Prepare aluminum alloy melt and add nucleating agent particles: (1) preparing materials according to the content of each alloy component and placing them in a smelting furnace, heating the smelting furnace to 800-900° C. to obtain molten aluminum alloy, and keeping the temperature for 10-20 minutes; (2) adding a master alloy containing nucleating agent particles to the melt, mechanically stirring for 1-2 minutes, and then ultrasonically treating; (3) adjusting the melt temperature to 690-710°C, keeping the temperature for 3-5 minutes, then adding a slag remover to the melt, stirring for 1-2 minutes and then removing the slag; Step 2: The obtained melt is cast into alloy plates by twin-roll casting: The prepared alloy melt is poured onto a casting roll with a water cooling system, and is formed into an alloy plate by twin-roll casting; The casting roll speed is 6-10 m / min, the roll gap is 0.3-1.0 mm, and the thickness of the cast plate is 1.5-2.5 mm. Step 3: rolling the alloy plate obtained by twin-roll casting: Since the alloy sheet is prone to cracks during the twin-roll casting process, the sheet obtained by twin-roll casting is rolled after solution treatment for 1-3 hours; Among them, the rolling temperature should be higher than the recrystallization temperature of the alloy, and the reduction is 60-70%; Step 4: Heat treatment of the rolled plate: The rolled plate is placed in a nitrogen oven and the oven temperature is raised to a temperature close to the eutectic point, kept at this temperature for 1-3 hours, and then quenched. The plate is then taken out and kept at 160-165°C for 8-10 hours and air-cooled.

5. The method for preparing a particle-reinforced gradient structure material by twin-roll casting as claimed in claim 3, characterized in that: The diameter of the nucleating agent particles in the aluminum-based master alloy described in step 1 is 80-500 nm.

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