A method of producing a high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting

Abstract

The application relates to a method for preparing a high-silicon heat-resistant aluminum alloy by extrusion casting, and relates to a method for preparing a high-silicon heat-resistant aluminum alloy by extrusion casting. The application aims at solving the technical problem that the stability and the anti-coarsening capability of the current Al-Si alloy are poor. The application provides more heterogeneous nucleation sites for refining the structure by zirconium and vanadium micro-alloying, and obtains an precipitated phase capable of significantly improving the strength of the alloy and inhibiting the coarsening of the high-silicon aluminum alloy, the generation of defects is inhibited through extrusion casting, the solid solubility of alloy elements in the matrix is improved, and therefore the synchronous improvement of the high-silicon aluminum alloy performance at room temperature and high temperature is realized. In the application, Zr and Ti can form Al3Ti and Al3Zr through a peritectic reaction, the appearance of Al3Ti and Al3Zr can significantly refine the microstructure of the alloy, and Zr and V are beneficial to the formation of (AlSi)3(ZrV) phase, the phase has good stability at high temperature.

Description

Technical Field

[0001] This invention relates to a method for preparing high-silicon heat-resistant aluminum alloys by extrusion casting. Background Technology

[0002] Al-Si alloys possess advantages such as lightweight, high strength, good thermal conductivity, and excellent formability, making them widely used in automotive, shipbuilding, construction, and aerospace industries. In these complex applications, the alloys are inevitably exposed to prolonged high-temperature environments, making their stability and resistance to hardening crucial for achieving long service life and strength. Therefore, improving the matrix strength, high-temperature strength, and high-temperature stability of heat-resistant aluminum alloys has become an important issue in the development of aluminum alloy materials.

[0003] Currently, the main methods for improving the strength and heat resistance of heat-resistant aluminum alloys include solid solution strengthening, dislocation strengthening, grain boundary strengthening, and second-phase strengthening. For high-silicon aluminum alloys, ceramic phase strengthening, eutectic strengthening, and precipitation strengthening are the main strengthening strategies. By using appropriate slow-diffusion microalloying elements, a more stable second phase can be obtained. These elements can reduce the diffusion rate of other elements or improve the morphology of grain boundaries and microstructure, thereby improving the alloy's strength and heat resistance. Furthermore, the introduction of microalloying elements provides more sites for heterogeneous nucleation, thus refining the microstructure. In addition, the squeeze casting process can significantly suppress the formation of shrinkage porosity, shrinkage cavities, and element segregation in high-silicon aluminum alloys during the casting process. Under rapid solidification and high pressure, not only can the solid solubility of alloying elements in the matrix be increased, but the microstructure can also be refined, which is highly beneficial for improving alloy properties. Therefore, the combination of microalloying and squeeze casting processes provides a new approach to strengthening high-silicon heat-resistant aluminum alloys. Summary of the Invention

[0004] The present invention aims to solve the technical problems of poor stability and anti-coarsening ability of current Al-Si alloys, and provides a method for preparing high-silicon heat-resistant aluminum alloys by extrusion casting with zirconium and vanadium microalloying.

[0005] The method for preparing high-silicon heat-resistant aluminum alloys by zirconium and vanadium microalloying extrusion casting of the present invention is carried out according to the following steps:

[0006] I. High-silicon heat-resistant aluminum alloy is composed of Al, Si, Cu, Ni, Zr, V, Ti, B, and Sr elements, with the following mass percentage composition: Si 11.5%–12.5%, Cu 4%–4.5%, Ni 2%–2.5%, Zr 0.1%–0.3%, V 0.1%–0.3%, Ti 0.0%–0.15%, B 0.0%–0.03%, Sr 0.00%–0.03%, with the balance being aluminum;

[0007] Weigh out pure aluminum, Al-Si master alloy, Al-Cu master alloy, Al-Ni master alloy, Al-Zr master alloy, Al-V master alloy, modifier and refining agent according to the above element ratios, and then put all raw materials into a drying oven to dry.

[0008] 2. Heat the graphite crucible to 150℃~200℃ in a pit furnace, and then coat the inner wall of the graphite crucible with a 15% ZnO aqueous solution to prevent the aluminum liquid from being contaminated during the smelting process.

[0009] 3. When the furnace temperature of the smelting furnace reaches 500℃~550℃, put the dried pure aluminum from step one into the smelting furnace, continue to raise the temperature to 720℃~725℃ and hold for 10 minutes to melt the pure aluminum.

[0010] IV. When the furnace temperature continues to rise to 730℃~740℃, put the Al-Si master alloy, Al-Cu master alloy and Al-Ni master alloy dried in step one into the melting furnace for melting and hold at 730℃~740℃ for 10 minutes.

[0011] 5. At the same temperature as in step 4, add the dried Al-Zr master alloy and Al-V master alloy from step 1 into the melting furnace for melting. After the Al-Zr master alloy and Al-V master alloy are completely melted, stir at a constant speed with a graphite rod for 5 min to 6 min to ensure the uniformity of the aluminum liquid, and hold at the temperature for 10 min to 11 min (because Zr has a large atomic number and heavy mass, it cannot be added at the same time as Al-Si, Al-Cu, and Al-Ni master alloys).

[0012] 6. Lower the furnace temperature to 720℃~725℃, add the modifier to the melting furnace and melt it completely. Let it stand for 10 minutes and then stir for 3 to 5 minutes.

[0013] 7. Add the refining agent to the melting furnace at 720℃~725℃, and stir for 3min~5min after it is fully melted;

[0014] 8. Refining, degassing and slag removal: When the aluminum liquid is 720℃, argon gas is introduced through a graphite rod with graphite blades for degassing. The flow rate of argon gas is 0.5L / min~0.6L / min and the time is 120s~130s. During the argon gas introduction process, the graphite rod with graphite blades rotates continuously to achieve the effect of cutting and stirring. After degassing, the surface slag is removed, and then the temperature is maintained for 10min~12min.

[0015] The graphite rod with graphite blades consists of a hollow cylinder and multiple graphite blades; one end of the hollow cylinder is the air inlet and the other end is the air outlet, with multiple circular air outlets at the center of the air outlet, the diameter of which is 2.5mm to 3mm; multiple graphite blades are evenly arranged on the side wall of the air outlet of the hollow cylinder; the graphite rod with graphite blades can shorten the degassing time and improve the degassing efficiency.

[0016] IX. Extrusion Casting: Extrusion casting is performed using a liquid forging press. The alloy casting temperature is 720℃~730℃, the mold temperature is 200℃~210℃, the holding pressure is 40s~45s, and the casting specific pressure is 0.4MPa / cm. 2 ~0.5MPa / cm 2 .

[0017] This invention provides more heterogeneous nucleation sites to refine the microstructure through zirconium and vanadium microalloying, and obtains a precipitate phase that can significantly improve the strength of the alloy and suppress coarsening of the high-silicon aluminum alloy. By suppressing the generation of defects through extrusion casting, the solid solubility of alloying elements in the matrix is ​​increased, thereby achieving simultaneous improvement of the room temperature and high temperature performance of the high-silicon aluminum alloy.

[0018] In this invention, Zr and Ti can form Al3Ti and Al3Zr through peritectic reactions. The presence of Al3Ti and Al3Zr significantly refines the alloy microstructure, and Zr and V facilitate the formation of the (AlSi)3(ZrV) phase, which exhibits good stability at high temperatures. The results of the embodiments show that the microstructure is refined, the grains are rounded, and the intermetallic compounds are uniformly distributed, with a tensile strength reaching 261.3 MPa. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the graphite rod with graphite blades described in step eight of Experiment 1.

[0020] Figure 2 for Figure 1 The left view;

[0021] Figure 3 Images of the extrusion casting metallographic structure of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy from Experiment 2;

[0022] Figure 4 The image shows a low-magnification scanning microstructure of the product after extrusion casting of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy in Experiment 2.

[0023] Figure 5This is a high-magnification scanning microstructure image of the product after extrusion casting of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy in Experiment 2. Detailed Implementation

[0024] Specific Implementation Method 1: This implementation method is a method for preparing high-silicon heat-resistant aluminum alloys by zirconium and vanadium microalloying extrusion casting, specifically carried out according to the following steps:

[0025] I. High-silicon heat-resistant aluminum alloy is composed of Al, Si, Cu, Ni, Zr, V, Ti, B, and Sr elements, with the following mass percentage composition: Si 11.5%–12.5%, Cu 4%–4.5%, Ni 2%–2.5%, Zr 0.1%–0.3%, V 0.1%–0.3%, Ti 0.0%–0.15%, B 0.0%–0.03%, Sr 0.00%–0.03%, with the balance being aluminum;

[0026] Weigh out pure aluminum, Al-Si master alloy, Al-Cu master alloy, Al-Ni master alloy, Al-Zr master alloy, Al-V master alloy, modifier and refining agent according to the above element ratios, and then put all raw materials into a drying oven to dry.

[0027] 2. Heat the graphite crucible to 150℃~200℃ in a pit furnace, and then coat the inner wall of the graphite crucible with a 15% ZnO aqueous solution to prevent the aluminum liquid from being contaminated during the smelting process.

[0028] 3. When the furnace temperature of the smelting furnace reaches 500℃~550℃, put the dried pure aluminum from step one into the smelting furnace, continue to raise the temperature to 720℃~725℃ and hold it for 10min~15min to melt the pure aluminum.

[0029] IV. When the furnace temperature continues to rise to 730℃~740℃, put the Al-Si master alloy, Al-Cu master alloy and Al-Ni master alloy dried in step one into the melting furnace for melting and hold at 730℃~740℃ for 10 minutes.

[0030] 5. At the same temperature as in step 4, add the dried Al-Zr master alloy and Al-V master alloy from step 1 into the melting furnace for melting. After the Al-Zr master alloy and Al-V master alloy are completely melted, use a graphite rod to stir at a constant speed for 5 min to 6 min to ensure the uniformity of the aluminum liquid, and keep it at the temperature for 10 min to 11 min.

[0031] 6. Lower the furnace temperature to 720℃~725℃, add the modifier to the melting furnace and melt it completely. Let it stand for 10 minutes and then stir for 3 to 5 minutes.

[0032] 7. Add the refining agent to the melting furnace at 720℃~725℃, and stir for 3min~5min after it is fully melted;

[0033] 8. Refining, degassing and slag removal: When the aluminum liquid is at 720℃~725℃, argon gas is introduced through a graphite rod with graphite blades for degassing. The flow rate of argon gas is 0.5L / min~0.6L / min and the time is 120s~130s. During the argon gas introduction process, the graphite rod with graphite blades rotates continuously to achieve the effect of cutting and stirring. After degassing, the surface slag is removed, and then the temperature is maintained for 10min~12min.

[0034] IX. Extrusion Casting: Extrusion casting is performed using a liquid forging press. The alloy casting temperature is 720℃~730℃, the mold temperature is 200℃~210℃, the holding pressure is 40s~45s, and the casting specific pressure is 0.4MPa / cm. 2 ~0.5MPa / cm 2 .

[0035] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the Al-Si master alloy mentioned in step one is Al-50Si, the Al-Cu master alloy is Al-50Cu, the Al-Ni master alloy is Al-10Ni, the Al-Zr master alloy is Al-10Zr, and the Al-V master alloy is Al-5V. Everything else is the same as in Specific Implementation Method One.

[0036] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the modifier mentioned in step one is Al-10Sr. Everything else is the same as in Specific Implementation Method One or Two.

[0037] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the refining agent mentioned in step one is Al-5Ti-B. Everything else is the same as in Specific Implementation Methods One to Three.

[0038] Specific Implementation Method Five: This implementation method differs from Specific Implementation Method Four in that the drying temperature in step one is 200℃ and the time is 1 hour. Everything else is the same as in Specific Implementation Method Four.

[0039] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method Five in that: in step three, after the furnace temperature reaches 500°C, the dried pure aluminum from step one is added to the furnace, and the temperature is further increased to 720°C and held for 10 minutes to melt the pure aluminum. Everything else is the same as in Specific Implementation Method Five.

[0040] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method Six in that: In step eight, when the aluminum liquid is at 720℃, argon gas is introduced using a graphite rod with graphite blades for degassing. The flow rate of the argon gas is 0.5L / min, and the time is 120s. During the argon gas introduction process, the graphite rod with graphite blades rotates continuously to achieve the effects of cutting and stirring. After degassing, the surface scum is removed, and then the liquid is kept at this temperature for 10 minutes. Everything else is the same as in Specific Implementation Method Six.

[0041] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method Seven in that: the graphite rod with graphite blades described in step eight consists of a hollow cylinder and multiple graphite blades; one end of the hollow cylinder is the air inlet, and the other end is the air outlet, with multiple circular air outlets at the center of the air outlet, the diameter of which is 2.5mm to 3mm; the multiple graphite blades are evenly distributed on the sidewall of the air outlet of the hollow cylinder. Everything else is the same as in Specific Implementation Method Seven.

[0042] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Method Eight in that the casting temperature of the alloy in step nine is 720℃. Everything else is the same as in Specific Implementation Method Eight.

[0043] Specific Implementation Method Ten: This implementation method differs from Specific Implementation Method Nine in that: in step nine, the mold temperature is 200℃, the holding time is 40s, and the casting specific pressure is 0.4MPa / cm. 2 Everything else is the same as in specific implementation method nine.

[0044] The invention was verified using the following experiments:

[0045] Experiment 1: This experiment demonstrates a method for preparing high-silicon heat-resistant aluminum alloys by zirconium and vanadium microalloying extrusion casting, specifically carried out according to the following steps:

[0046] I. High-silicon heat-resistant aluminum alloy is composed of Al, Si, Cu, Ni, Zr, V, Ti, B and Sr elements, with the following mass percentage composition: Si 11.5%, Cu 4%, Ni 2%, Zr 0.1%, V 0.1%, Ti 0.1%, B 0.02%, Sr 0.02%, and the balance being aluminum;

[0047] According to the above-mentioned element proportions, weigh out pure aluminum, Al-50Si master alloy, Al-50Cu master alloy, Al-10Ni master alloy, Al-10Zr master alloy, Al-5V master alloy, modifier Al-10Sr and refiner Al-5Ti-B respectively, and then put all raw materials into a drying oven to dry at 200℃ for 1 hour.

[0048] 2. Heat the graphite crucible to 150°C in a pit furnace, and then coat the inner wall of the graphite crucible with a 15% ZnO aqueous solution to prevent the molten aluminum from being contaminated during the smelting process.

[0049] 3. When the furnace temperature reaches 500℃, put the dried pure aluminum from step 1 into the furnace, continue to heat it to 720℃ and hold it for 10 minutes to melt the pure aluminum.

[0050] 4. When the furnace temperature continues to rise to 740℃, put the Al-50Si master alloy, Al-50Cu master alloy and Al-10Ni master alloy dried in step one into the melting furnace for melting and hold at 740℃ for 10 minutes.

[0051] 5. Add the dried Al-10Zr master alloy and Al-5V master alloy from step 1 to the melting furnace at 740℃ for melting. After the Al-10Zr master alloy and Al-5V master alloy are completely melted, stir at a constant speed with a graphite rod for 5 minutes to ensure the uniformity of the aluminum liquid, and keep it at the temperature for 10 minutes.

[0052] 6. Reduce the furnace temperature to 720℃, add the modifier Al-10Sr into the melting furnace and let it stand for 10 minutes, then stir for 5 minutes.

[0053] 7. Add the refining agent Al-5Ti-B to the melting furnace at 720℃, and stir for 3 minutes after it is fully melted;

[0054] 8. Refining, degassing and slag removal: When the aluminum liquid is 720℃, argon gas is introduced through a graphite rod with graphite blades for degassing. The flow rate of argon gas is 0.5L / min and the time is 120s. During the argon gas introduction process, the graphite rod with graphite blades rotates continuously to achieve the effect of cutting and stirring. After degassing, the surface slag is removed, and then the temperature is maintained for 10min.

[0055] like Figure 1 and Figure 2 As shown, the graphite rod with graphite blades consists of a hollow cylinder 1 and eight graphite blades 2. One end of the hollow cylinder 1 is the air inlet, and the other end is the air outlet. Multiple circular air outlets 1-1 are provided at the center of the air outlet, and the diameter of the air outlets 1-1 is 2.5 mm. The eight graphite blades 2 are evenly arranged on the side wall of the air outlet of the hollow cylinder 1. The hollow cylinder 1 and the eight graphite blades 2 are an integral structure and are all made of graphite. The air inlet of the hollow cylinder 1 is connected to a flow meter and an argon cylinder. The thickness of the graphite blades 2 is 4 mm, and the inclination angle is 45°.

[0056] IX. Extrusion Casting: Extrusion casting is performed using a liquid forging press. The alloy pouring temperature is 720℃, the die temperature is 200℃, the holding pressure is 40s, and the casting specific pressure is 0.4MPa / cm². 2 .

[0057] Experiment 2: This experiment differs from Experiment 1 in that the elements in step 1 are composed of the following mass percentages: Si 12%, Cu 4.3%, Ni 2.2%, Zr 0.2%, V 0.2%, Ti 0.1%, B 0.02%, Sr 0.02%, with the balance being aluminum. Everything else is the same as in Experiment 1.

[0058] Figure 3 The images show the extrusion casting metallographic microstructure of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy from Experiment 2. Figure 3 The metallographic microstructure shows that the microalloyed alloy has a uniform structure, and the roundness of the α-Al matrix is ​​significantly improved compared with the same type of alloy. The typical dendrite growth of extrusion casting is significantly suppressed, and there are no porosity inclusions in the structure as seen in traditional casting.

[0059] Figure 4 The images show low-magnification scanning microstructures of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy products after extrusion casting in Experiment 2. Figure 4 Scanning microscopy revealed that the eutectic Si mainly exists in the form of dots and worm-like structures. The intermetallic compounds are uniformly and finely distributed in the matrix, and dot-like Al2Cu reinforcing phases are also uniformly distributed in the matrix.

[0060] Figure 5 High-magnification scanning microstructure images of the product after extrusion casting of the Al-12Si-4.3Cu-2.2Ni-0.2Z-0.2V-0.1Ti-0.02B-0.02Sr alloy in Experiment 2. Figure 5 It can be seen that a clover-shaped reinforcing phase appears in the microalloyed matrix. This reinforcing phase is (AlSi)3(ZrV), which has good stability at high temperature and plays a crucial role in the pinning and obstruction of grain boundaries and dislocations. Tensile property tests show that the strength after zirconium and vanadium microalloying is 261.3 MPa, which is close to the strength of similar high silicon aluminum alloys in the T5 state.

[0061] Experiment 3: This experiment differs from Experiment 1 in that the elements in step 1 are composed of the following mass percentages: Si 12.5%, Cu 4.5%, Ni 2.5%, Zr 0.3%, V 0.3%, Ti 0.1%, B 0.02%, Sr 0.02%, with the balance being aluminum. Everything else is the same as in Experiment 1.

Claims

1. A method of producing a high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting, characterized by The method for preparing high-silicon heat-resistant aluminum alloy by zirconium and vanadium micro-alloying extrusion casting is carried out in the following steps: The high-silicon heat-resistant aluminum alloy is composed of Al, Si, Cu, Ni, Zr, V, Ti, B and Sr, and the mass percentage of each element is as follows: Si is 11.5%~12.5%, Cu is 4%~4.5%, Ni is 2%~2.5%, Zr is 0.1%~0.3%, V is 0.1%~0.3%, Ti is greater than 0 and less than or equal to 0.15%, B is greater than 0 and less than or equal to 0.03%, Sr is greater than 0 and less than or equal to 0.03%, and the balance is aluminum; According to the above element ratio, pure aluminum, Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Ni intermediate alloy, Al-Zr intermediate alloy, Al-V intermediate alloy, modifier and refiner are weighed and put into a drying box for drying; the modifier is Al-10Sr; and the refiner is Al-5Ti-B; Secondly, the graphite crucible is heated to 150℃~200℃ in the pit furnace, and then a layer of 15% ZnO aqueous solution is coated on the inner wall of the graphite crucible to prevent the molten aluminum from being contaminated during the smelting process; Thirdly, when the temperature of the smelting furnace reaches 500℃~550℃, the dried pure aluminum in step one is put into the smelting furnace, and the temperature is continuously raised to 720℃~725℃ and kept for 10min~15min to melt the pure aluminum; Fourthly, when the temperature of the smelting furnace is continuously raised to 730℃~740℃, the dried Al-Si intermediate alloy, Al-Cu intermediate alloy and Al-Ni intermediate alloy in step one are put into the smelting furnace for melting and keeping at 730℃~740℃ for 10min; Fifthly, the dried Al-Zr intermediate alloy and Al-V intermediate alloy in step one are added to the smelting furnace for melting at the same temperature as step four, and when the Al-Zr intermediate alloy and Al-V intermediate alloy are completely melted, the graphite rod is used for uniform stirring for 5min~6min to ensure the uniformity of the molten aluminum, and the temperature is kept for 10min~11min; Sixthly, the temperature of the smelting furnace is reduced to 720℃~725℃, the modifier is added to the smelting furnace for complete melting, and then the smelting furnace is kept still for 10min and stirred for 3min~5min; Seventhly, the refiner is added to the smelting furnace at 720℃~725℃, and after complete melting, the smelting furnace is stirred for 3min~5min; Eighthly, refining, degassing and deslagging: when the temperature of the molten aluminum is 720℃~725℃, argon gas is introduced into the smelting furnace through the graphite rod with graphite blade, the flow rate of the argon gas is 0.5L / min~0.6L / min, and the time is 120s~130s; during the introduction of the argon gas, the graphite rod with graphite blade rotates continuously to achieve the functions of cutting and stirring; after the degassing is completed, the surface scum is removed, and then the temperature is kept for 10min~12min; Nine, squeeze casting: using liquid die forging press for squeeze casting, the pouring temperature of the alloy is 720℃~730℃, the mold temperature is 200℃~210℃, the time pressure is maintained for 40s~45s, and the casting specific pressure is 0.4MPa / cm 2 ~0.5MPa / cm 2 .

2. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that The Al-Si intermediate alloy in step one is Al-50Si, the Al-Cu intermediate alloy is Al-50Cu, the Al-Ni intermediate alloy is Al-10Ni, the Al-Zr intermediate alloy is Al-10Zr, and the Al-V intermediate alloy is Al-5V.

3. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that The drying temperature in step one is 200℃, and the time is 1h.

4. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that In step three, after the temperature of the smelting furnace reaches 500℃, the dried pure aluminum in step one is put into the smelting furnace, and the temperature is continuously raised to 720℃ and kept for 10min to melt the pure aluminum.

5. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that In step eight, when the aluminum liquid is at 720℃, argon gas is introduced into the graphite rod with graphite blades to remove the gas, the flow rate of the argon gas is 0.5L / min, and the time is 120s. During the introduction of the argon gas, the graphite rod with graphite blades rotates continuously to achieve the functions of cutting and stirring. After the gas removal is completed, the surface dross is removed, and then the temperature is kept for 10min.

6. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that The graphite rod with graphite blades in step eight is composed of a hollow cylinder and multiple graphite blades. One end of the hollow cylinder is the gas inlet end, and the other end is the gas outlet end. Multiple circular gas outlets are arranged at the center of the gas outlet end, and the diameter of the gas outlets is 2.5mm-3mm. Multiple graphite blades are uniformly arranged on the side wall of the gas outlet end of the hollow cylinder.

7. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that The alloy casting temperature in step nine is 720℃.

8. A method of producing high-silicon heat-resistant aluminum alloy by zirconium and vanadium microalloying extrusion casting according to claim 1, characterized in that The mold temperature in step nine is 200°C, the time for pressure maintenance is 40s, and the casting specific pressure is 0.4 MPa / cm 2 .

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