High-silicon aluminum alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of non-ferrous metal material preparation, and particularly relates to a high-silicon aluminum alloy material and a preparation method thereof, and the high-silicon aluminum alloy material comprises the following raw material components in percentage by mass: 12-14% of Si, 1.6-2.0% of Cu, 1.0-2.0% of Mg, 0.5-1.3% of Ni, less than or equal to 0.05% of Ti, 0.1-0.3% of Sc, 0.04-0.07% of Sr and the balance of A1; the ratio of Cu to Sc is (6-16): 1; the tensile strength, the yield strength and the ductility of the aluminum alloy material are improved at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-ferrous metal material preparation, and particularly relates to a high-silicon aluminum alloy material and a preparation method thereof. Background Art

[0002] High-silicon aluminum alloy is an alloy material mainly composed of aluminum and silicon, and its silicon content is usually between 12% and 25%. It has high strength, high hardness and wear resistance, and can withstand large loads; it can still maintain stability in high-temperature and corrosive environments, and has better oxidation resistance than ordinary aluminum alloys; it has excellent thermal conductivity and is suitable for scenarios such as electronic component radiators. It has a relatively low melting point and is easy to be cast and processed into parts with complex shapes. After being extruded and formed, high-silicon aluminum alloy is widely used in wear-resistant parts such as automobile engine pistons and cylinder liners, aerospace hydraulic valve bodies and satellite structural parts, electronic heat dissipation substrates and packaging shells, industrial robot joint parts, and new energy battery trays and other key fields due to its high strength, wear resistance and lightweight characteristics.

[0003] The composition design of aluminum-silicon alloy is particularly important. The silicon content needs to be precisely balanced. If it is too high, it is easy to form coarse primary silicon, causing stress concentration and brittle fracture. If it is too low, the wear resistance will be weakened. Rare earth elements can play an auxiliary modification role in the modification treatment of aluminum-silicon alloy, and at the same time improve the structure and refine the grains. However, the ratio of rare earth elements to other strengthening elements needs to consider the synergistic strengthening and uniform distribution of the precipitated phases to prevent interphase competition or abnormal coarsening caused by unbalanced ratios. In addition, the stability of active elements needs to be ensured through process adaptation to avoid melting loss and modification failure.

[0004] The authorized announcement number CN108251710B discloses a high-strength and tough high-silicon aluminum alloy suitable for squeeze casting and its preparation process. The components are calculated by weight percentage as follows: 17-23% Si, 0.5-1% Cu, 0.3-0.8% Mg, 0.2-0.5% Fe, 0.5-0.8% Mn, 0.2-0.4% RE, 0.05-0.1% P, 0.3% trace elements, and the balance is Al; the trace elements include Cr or Ti; the tensile strength is greater than 350 MPa, the yield strength is greater than 160 MPa, and the elongation is greater than 3%. The performance still needs to be further improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-silicon aluminum alloy material and a preparation method thereof, and simultaneously improve the tensile strength, yield strength and elongation of the aluminum alloy material.

[0006] The embodiment of the present invention provides a high-silicon aluminum alloy material, which comprises the following raw material components in mass percentage: Si: 12 - 14%, Cu: 1.6 - 2.0%, Mg: 1.0 - 2.0%, Ni: 0.5 - 1.3%, Ti ≤ 0.05%, Sc: 0.1 - 0.3%, Sr: 0.04 - 0.07%, with the balance being Al; the Cu / Sc is 6 - 16:1.

[0007] Preferably, it comprises raw material components with the following mass percentages: Si: 12.5 - 13.5%, Cu: 1.6 - 2.0%, Mg: 1.3 - 1.7%, Ni: 0.7 - 1.2%, Ti: 0.02 - 0.04%, Sc: 0.13 - 0.25%, Sr: 0.05 - 0.065%, with the balance being Al; the Cu / Sc is 8 - 13:1.

[0008] More preferably, it comprises raw material components with the following mass percentages: Si: 12.8%, Cu: 1.7%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.14%, Sr: 0.055%, with the balance being Al.

[0009] An embodiment of the present invention provides a method for preparing the high - silicon aluminum alloy material as described above, comprising the following steps: mixing the raw material components of the high - silicon aluminum alloy material, melting, refining, on - line treatment, semi - continuous casting, homogenization treatment, extrusion molding, solution and aging treatment to obtain the high - silicon aluminum alloy material.

[0010] Optionally, during melting, the temperature is 730 - 750°C, the oxygen content is controlled below 300 ppm, and an inert gas is introduced above the melt.

[0011] Optionally, during on - line treatment, the degassing gas is argon, the argon flow rate is 30 - 50 L / min, the rotation speed is 300 - 450 r / min, Al - 5Ti - B is used for wire feeding, and the wire - feeding ratio is 1.5 kg / 1 t Al; the filtration method is plate filtration.

[0012] Optionally, during semi - continuous casting, the casting end temperature is controlled at 680 - 690°C, the steady - state casting speed is 50 - 55 mm / min, and the water flow rate is 16 - 20 m 3 / h.

[0013] Optionally, during homogenization treatment, the heating rate is controlled at 50 - 60°C / h, the homogenization temperature is 490 - 500°C, and the holding time is 14 - 18 h.

[0014] Optionally, during extrusion molding, the extrusion temperature is controlled at 370 - 410°C, and the extrusion speed is 0.1 - 0.3 m / min.

[0015] Optionally, the solution temperature is 505 - 515°C, and the holding time is 20 - 40 min; the aging treatment temperature is 155 - 165°C, and the holding time is 2 - 4 h.

[0016] The beneficial effects of the present invention are as follows: on the basis of traditional 4-series alloys, the silicon content and copper content are limited, and at the same time, the Cu / Sc content ratio is limited to optimize the alloy structure and properties. Cu forms nano precipitation phases (θ' phases) to hinder the movement of dislocations, while Sc generates thermally stable phases, preferentially heterogeneous nucleating at grain boundaries and defects, refining the grains (Hall-Petch effect) and serving as precipitation templates, promoting the uniform distribution of the two phases. An appropriate Cu / Sc ratio ensures that Sc atoms preferentially occupy defect sites, avoiding competition with Cu to form coarse composite phases, and at the same time optimizing the precipitation kinetics: precipitating preferentially in the low-temperature aging stage, providing nucleation sites for subsequent to form coherent / semi-coherent interfaces to synergistically strengthen the matrix. At the same time, melt modification treatment is carried out under the protection of inert gas, effectively reducing the oxidation and burning loss of alloying elements (such as magnesium and strontium), ensuring that the modifier (strontium) fully plays its role, and at the same time avoiding the formation of oxide inclusions and purifying the matrix structure. Detailed implementation manners Example 1

[0017] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 12.8%, Cu: 1.7%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.14%, Sr: 0.055%, and the balance is A1 and unavoidable impurities. The specific steps are as follows: First step, perform batching calculation and prepare materials according to the designed composition requirements. Preheat the furnace to above 650°C in advance, put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy into the melting furnace, set the melting furnace to 740°C for heating and melting. After full melting, introduce inert gas Ar above the melt in the furnace, control the oxygen content at 200 ppm, add aluminum-titanium master alloy and aluminum-strontium master alloy, and then use the in-furnace rotor to degas and refine the aluminum melt. The refining time is 25 min, the rotor speed is 450 r / min, and the argon flow rate is 50 L / min. After degassing, let it stand for 10 min for slag skimming. After slag skimming is completed, adjust the temperature of the aluminum melt to 730°C and let it stand for 30 min.

[0018] Step 2: Online processing. The online degassing gas is argon, with an argon flow rate of 40 L / min and a rotor speed of 350 r / min. For online grain refinement, wire feeding is carried out using Al-5Ti-B, with a wire feeding ratio of 1.5 kg / 1 t Al. The filtration method is plate filtration, 30PPi + 50PPi.

[0019] Step 3: Semi-continuous casting is carried out using a lubricated tooling. The semi-continuous casting parameters are as follows: the temperature at the end of casting is 680 - 690 °C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0020] Step 4: Homogenization treatment. The heating rate is 60 °C / h, the homogenization temperature is 495 ± 5 °C, and after reaching the temperature, the holding time is 16 h. After reaching the temperature, the cooling method is air cooling + water mist cooling.

[0021] Step 5: Extrusion forming. The extrusion temperature is 385 °C and the extrusion speed is 0.15 m / min.

[0022] Step 6: Solution aging treatment. The solution temperature is 510 °C, the holding time is 30 min, the aging temperature is 160 °C, and the holding time is 2.5 h. Example 2

[0023] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 13.2%, Cu: 1.8%, Mg: 1.6%, Ni: 0.10%, Ti: 0.03%, Sc: 0.20%, Sr: 0.06%, and the balance is A1 and unavoidable impurities. The specific steps are as follows: Step 1: According to the designed composition requirements, carry out batching calculation and prepare materials. Preheat the furnace to above 650 °C in advance, put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy into the melting furnace, set the melting furnace to 740 °C for heating and melting. After full melting, introduce inert gas Ar above the melt in the furnace, control the oxygen content at 260 ppm, add aluminum-titanium master alloy and aluminum-strontium master alloy, and then use a rotor in the furnace to degas and refine the aluminum melt. The refining time is 20 min, the rotor speed is 480 r / min, the argon flow rate is 50 L / min. After degassing is completed, let it stand for 10 min for slag skimming. After slag skimming is completed, adjust the temperature of the aluminum melt to 730 °C and let it stand for 30 min.

[0024] Step 2: Online processing. The online degassing gas is argon, with an argon flow rate of 45 L / min and a rotor speed of 350 r / min. For online grain refinement, wire feeding is carried out using Al-5Ti-B, with a wire feeding ratio of 1.5 kg / 1 t Al. The filtration method is plate filtration, 30PPi + 50PPi.

[0025] In the third step, semi-continuous casting is carried out using a lubricated tooling. The semi-continuous casting parameters are as follows: the casting end temperature is 680 - 690 °C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0026] In the fourth step, homogenization treatment is carried out. The heating rate is 60 °C / h, the homogenization temperature is 495 ± 5 °C. After reaching the temperature, the holding time is 16 h. The cooling method after reaching the temperature is air cooling + water mist cooling.

[0027] In the fifth step, extrusion forming is carried out. The extrusion temperature is 385 °C, and the extrusion speed is 0.15 m / min.

[0028] In the sixth step, solution aging treatment is carried out. The solution temperature is 510 °C, the holding time is 30 min, the aging temperature is 160 °C, and the holding time is 2.5 h. Comparative Example 1

[0029] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 13%, Cu: 1.2%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.16%, Sr: 0.055%, and the balance is A1 and unavoidable impurities. Among them, Cu / Sc = 7.5. The specific steps are as follows: In the first step, batching calculation and raw material preparation are carried out according to the designed composition requirements. The furnace is preheated to above 650 °C in advance. 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy are put into the melting furnace. The melting furnace is set to be heated and melted at 740 °C. After being fully melted, inert gas Ar is introduced above the melt in the furnace, and the oxygen content is controlled at 200 ppm. Aluminum-titanium master alloy and aluminum-strontium master alloy are added. Then, a rotor in the furnace is used to degas and refine the aluminum melt. The refining time is 25 min, the rotor speed is 450 r / min, and the argon gas flow rate is 50 L / min. After degassing is completed, it is left standing for 10 min for slag skimming. After slag skimming is completed, the temperature of the aluminum melt is adjusted to 730 °C and left standing for 30 min.

[0030] In the second step, on-line treatment is carried out. The on-line degassing gas is argon, and the argon gas flow rate is 40 L / min; the rotor speed is 350 r / min; on-line grain refinement is carried out by feeding wire with Al-5Ti-B, and the feeding ratio is 1.5 kg / 1 tAl; the filtration method is plate filtration, 30PPi + 50PPi.

[0031] In the third step, semi-continuous casting is carried out using a lubricated tooling. The semi-continuous casting parameters are as follows: the casting end temperature is 680 - 690 °C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0032] Step 4: Homogenization treatment. The heating rate is 60 °C / h, the homogenization temperature is 495 ± 5 °C, the holding time after reaching the temperature is 16 h, and the cooling method after reaching the temperature is air cooling + water mist cooling.

[0033] Step 5: Extrusion forming. The extrusion temperature is 385 °C and the extrusion speed is 0.15 m / min.

[0034] Step 6: Solution aging treatment. The solution temperature is 510 °C, the holding time is 30 min, the aging temperature is 160 °C, and the holding time is 2.5 h. Comparative Example 2

[0035] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 13.0%, Cu: 1.7%, Mg: 1.6%, Ni: 0.10%, Ti: 0.03%, Sc: 0.05%, Sr: 0.06%, and the balance is A1 and unavoidable impurities. Among them, Cu / Sc = 34. The specific steps are as follows: Step 1: Carry out batching calculation and prepare materials according to the designed composition requirements. Preheat the furnace to above 650 °C in advance, put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, and aluminum-nickel master alloy into the melting furnace, set the melting furnace to 740 °C for heating and melting. After full melting, introduce inert gas Ar above the melt in the furnace, control the oxygen content at 260 ppm, add aluminum-titanium master alloy and aluminum-strontium master alloy, and then use the in-furnace rotor to degas and refine the aluminum melt. The refining time is 20 min, the rotor speed is 480 r / min, and the argon gas flow rate is 50 L / min. After degassing, let it stand for 10 min for slag skimming. After slag skimming is completed, adjust the temperature of the aluminum melt to 730 °C and let it stand for 30 min.

[0036] Step 2: Online treatment. The online degassing gas is argon, the argon gas flow rate is 45 L / min, and the rotor speed is 350 r / min; online grain refinement uses Al-5Ti-B for wire feeding, and the wire feeding ratio is 1.5 kg / 1 tAl; the filtration method uses plate filtration, 30PPi + 50PPi.

[0037] Step 3: Semi-continuous casting is carried out using a lubricated tooling. Semi-continuous casting parameters: the casting end temperature is 680 - 690 °C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0038] Step 4: Homogenization treatment. The heating rate is 60 °C / h, the homogenization temperature is 495 ± 5 °C, the holding time after reaching the temperature is 16 h, and the cooling method after reaching the temperature is air cooling + water mist cooling.

[0039] Step 5: Extrusion forming, extrusion temperature is 385°C, extrusion speed is 0.15 m / min.

[0040] Step 6: Solution aging treatment, solution temperature is 510°C, holding time is 30 min, aging temperature is 160°C, holding time is 2.5 h. Comparative Example 3

[0041] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 13.0%, Cu: 1.6%, Mg: 1.6%, Ni: 0.10%, Ti: 0.03%, Sc: 0.4%, Sr: 0.055%, and the balance is A1 and unavoidable impurities. Among them, Cu / Sc = 4. The specific steps are as follows: Step 1: Perform batching calculation and prepare materials according to the designed composition requirements. Preheat the furnace to above 650°C in advance. Put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy into the melting furnace. Set the melting furnace to heat and melt at 740°C. After full melting, introduce inert gas Ar above the melt in the furnace, control the oxygen content at 260 ppm, add aluminum-strontium master alloy and aluminum-titanium master alloy, and then use the in-furnace rotor to degas and refine the aluminum melt. The refining time is 20 min, the rotor speed is 480 r / min, the argon gas flow rate is 50 L / min. After degassing, let it stand for 10 min for slag skimming. After slag skimming, adjust the temperature of the aluminum melt to 730°C and let it stand for 30 min.

[0042] Step 2: Online treatment, the online degassing gas is argon, the argon gas flow rate is 45 L / min, and the rotor speed is 350 r / min; for online grain refinement, Al-5Ti-B is used for wire feeding, and the wire feeding ratio is 1.5 kg / 1 tAl; the filtration method uses plate filtration, 30PPi + 50PPi.

[0043] Step 3: Semi-continuous casting is carried out using a lubricated tooling. Semi-continuous casting parameters: the casting end temperature is 680 - 690°C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0044] Step 4: Homogenization treatment, the heating rate is 60°C / h, the homogenization temperature is 495 ± 5°C, after reaching the temperature, the holding time is 16 h, and the cooling method after reaching the temperature is air cooling + water mist cooling.

[0045] Step 5: Extrusion forming, extrusion temperature is 385°C, extrusion speed is 0.15 m / min.

[0046] Step 6: Solution aging treatment, solution temperature is 510°C, holding time is 30 min, aging temperature is 160°C, holding time is 2.5 h. Comparative Example 4

[0047] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 11%, Cu: 1.7%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.14%, Sr: 0.055%, and the balance is A1 and unavoidable impurities. Among them, Cu / Sc = 12.1. The specific steps are as follows: First step, perform batching calculation and prepare materials according to the designed composition requirements. Preheat the furnace to above 650°C in advance, and put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy into the melting furnace. Set the melting furnace to 740°C for heating and melting. After full melting, introduce inert gas Ar above the melt in the furnace, control the oxygen content at 200 ppm, add aluminum-titanium master alloy and aluminum-strontium master alloy, and then use an in-furnace rotor to degas and refine the aluminum melt. The refining time is 25 min, the rotor speed is 450 r / min, and the argon gas flow rate is 50 L / min. After degassing, let it stand for 10 min for slag skimming. After slag skimming is completed, adjust the temperature of the aluminum melt to 730°C and let it stand for 30 min.

[0048] Second step, online treatment. The online degassing gas is argon, and the argon gas flow rate is 40 L / min, and the rotor speed is 350 r / min; online grain refinement uses Al-5Ti-B for wire feeding, and the wire feeding ratio is 1.5 kg / 1 tAl; the filtration method uses plate filtration, 30PPi + 50PPi.

[0049] Third step, semi-continuous casting is carried out using an oil-lubricated tooling. The semi-continuous casting parameters: the casting end temperature is 680 - 690°C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0050] Fourth step, homogenization treatment. The heating rate is 60°C / h, the homogenization temperature is 495 ± 5°C, the holding time after reaching the temperature is 16 h, and the cooling method after reaching the temperature is air cooling + water mist cooling.

[0051] Fifth step, extrusion forming. The extrusion temperature is 385°C, and the extrusion speed is 0.15 m / min.

[0052] Sixth step, solution aging treatment. The solution temperature is 510°C, the holding time is 30 min, the aging temperature is 160°C, and the holding time is 2.5 h. Comparative Example 5

[0053] A preparation method of a high-silicon aluminum alloy material, the ingredients are composed of the following components by weight percentage: Si: 12.8%, Cu: 1.7%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.15%, Sr: 0.055%, and the balance is A1 and unavoidable impurities. Among them, Cu / Sc = 11.3. The specific steps are as follows: First step, perform batching calculation and prepare materials according to the designed composition requirements. Preheat the furnace to above 650 °C in advance, put 99.70% aluminum ingots, aluminum-silicon master alloy, aluminum-copper master alloy, aluminum-nickel master alloy, and aluminum-scandium master alloy into the melting furnace. Set the melting furnace to 740 °C for heating and melting. After full melting, directly add aluminum-titanium master alloy and aluminum-strontium master alloy. Then use the in-furnace rotor to degas and refine the aluminum melt. The refining time is 25 min, the rotor speed is 450 r / min, and the argon flow rate is 50 L / min. After degassing, let it stand for 10 min for slag skimming. After slag skimming is completed, adjust the temperature of the aluminum melt to 730 °C and let it stand for 30 min.

[0054] Second step, online treatment. The online degassing gas is argon, and the argon flow rate is 40 L / min, and the rotor speed is 350 r / min; for online grain refinement, Al-5Ti-B is used for wire feeding, and the wire feeding ratio is 1.5 kg / 1 tAl; the filtration method uses plate filtration, 30PPi + 50PPi.

[0055] Third step, semi-continuous casting is carried out using a lubricated tooling. Semi-continuous casting parameters: the casting end temperature is 680 - 690 °C, the steady-state casting speed is 52 mm / min, and the water flow rate is 18 m 3 / h.

[0056] Fourth step, homogenization treatment. The heating rate is 60 °C / h, the homogenization temperature is 495 ± 5 °C. After reaching the temperature, the holding time is 16 h. The cooling method after reaching the temperature uses air cooling + water mist cooling.

[0057] Fifth step, extrusion forming. The extrusion temperature is 385 °C, and the extrusion speed is 0.15 m / min.

[0058] Sixth step, solution aging treatment. The solution temperature is 510 °C, the holding time is 30 min, the aging temperature is 160 °C, and the holding time is 2.5 h.

[0059] Test the room temperature tensile properties of the high-silicon aluminum alloy materials in Examples 1 - 2 and Comparative Examples 1 - 5 to obtain the performance table shown in Table 1.

[0060] Table 1 Room temperature tensile property table of different high-silicon aluminum alloy materials

[0061] As can be seen from Table 1, by controlling the contents of the components of the high-silicon aluminum alloy material, especially the contents and ratios of Cu and Sc, the tensile strength, yield strength and elongation of the high-silicon aluminum alloy material can be significantly and simultaneously improved.

[0062] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; under the concept of this application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of one or more embodiments of this application as described above, and they are not provided in detail for the sake of brevity.

[0063] One or more embodiments of this application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application shall be included within the scope of protection of this application.

Claims

1. A high-silicon aluminum alloy material, characterized in that, The raw material components include the following mass percentages: Si: 12 - 14%, Cu: 1.6 - 2.0%, Mg: 1.0 - 2.0%, Ni: 0.5 - 1.3%, Ti ≤ 0.05%, Sc: 0.1 - 0.3%, Sr: 0.04 - 0.07%, the balance is Al; the Cu / Sc is 6 - 16:

1.

2. The high-silicon aluminum alloy material according to claim 1, wherein The raw material components include the following mass percentages: Si: 12.5 - 13.5%, Cu: 1.6 - 2.0%, Mg: 1.3 - 1.7%, Ni: 0.7 - 1.2%, Ti: 0.02 - 0.04%, Sc: 0.13 - 0.25%, Sr: 0.05 - 0.065%, the balance is Al; the Cu / Sc is 8 - 13:

1.

3. The high-silicon aluminum alloy material according to claim 2, characterized in that, The raw material components include the following mass percentages: Si: 12.8%, Cu: 1.7%, Mg: 1.5%, Ni: 0.9%, Ti: 0.03%, Sc: 0.14%, Sr: 0.055%, the balance is Al.

4. A method for preparing a high-silicon aluminum alloy material according to any one of claims 1-3, characterized in that, It includes the following steps: mixing the raw material components of the high-silicon aluminum alloy material, melting, refining, on-line treatment, semi-continuous casting, homogenization treatment, extrusion molding, solution treatment and aging treatment to obtain the high-silicon aluminum alloy material.

5. The preparation method according to claim 4, characterized in that, During melting, the temperature is 730 - 750 °C, the oxygen content is controlled below 300 ppm, and an inert gas is introduced above the melt.

6. The preparation method according to claim 4, characterized in that, During on-line treatment, the degassing gas is argon, the argon flow rate is 30 - 50 L / min, the rotation speed is 300 - 450 r / min, wire feeding is carried out using Al-5Ti-B, and the wire feeding ratio is 1.5 kg / 1 t Al; the filtration method is plate filtration.

7. The preparation method according to claim 4, characterized in that, During semi-continuous casting, control the temperature at the end of casting to 680 - 690 °C, the steady-state casting speed to 50 - 55 mm / min, and the water flow rate to 16 - 20 m 3 / h.

8. The preparation method according to claim 4, characterized in that, During homogenization treatment, the heating rate is controlled at 50 - 60 °C / h, the homogenization temperature is 490 - 500 °C, and the holding time is 14 - 18 h.

9. The preparation method according to claim 4, characterized in that, During extrusion molding, the extrusion temperature is controlled at 370 - 410 °C, and the extrusion speed is 0.1 - 0.3 m / min.

10. The preparation method according to claim 4, characterized in that, The solution temperature is 505 - 515 °C, and the holding time is 20 - 40 min; the aging treatment temperature is 155 - 165 °C, and the holding time is 2 - 4 h.

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