Method for preparing high-strength heat-resistant Al-Si eutectic alloy through multi-element microalloying and heat treatment regulation

Abstract

The invention relates to a method for preparing a high-strength heat-resistant Al-Si eutectic alloy, in particular to a method for preparing a high-strength heat-resistant Al-Si eutectic alloy through multi-element microalloying and heat treatment regulation. The invention aims to solve the technical problem that the existing Al-Si eutectic alloy is poor in strength and heat resistance. The prepared alloy needs to be subjected to the processes of smelting, remelting, T6 heat treatment and the like to achieve high hardness and high strength, the structure morphology and a second phase are regulated and controlled through the T6 heat treatment process, and a unique microscopic structure of twin crystals and stacking faults appears due to addition of trace metal elements; through introduction of multi-element microalloying alloy elements, the volume fraction of an Al3 (Zr, Er, Sc)-L12 phase is remarkably increased, the consistent effect of twin crystal and stacking fault on dislocation is enhanced, and the high-temperature service condition of the Al-Si eutectic alloy is met.

Description

Technical Field

[0001] The invention relates to a method for preparing a high-strength and heat-resistant Al-Si eutectic alloy. Background Art

[0002] Aluminum alloys strengthened by nano-scale L12 ordered Al3M (M is a transition element and a rare earth element) precipitates have attracted attention as high-temperature application materials in the transportation and aerospace industries due to their high strength at high temperatures, excellent creep resistance and coarsening resistance (Ostwald ripening). Therefore, the addition of elements such as copper, magnesium, manganese, zinc, silver, iron, zirconium, titanium and scandium is expected to prepare a new generation of heat-resistant aluminum alloy materials, so that the comprehensive properties of aluminum alloys can meet the complex service environment.

[0003] Al-Si eutectic alloys are widely used in complex aero-engine casing castings and high-horsepower engine pistons due to their good casting fluidity and low thermal expansion coefficient. Due to the more complex service environment of parts, higher requirements are placed on the strength and heat resistance of casting materials. The addition of microalloying elements has a significant effect on the formation, evolution and mechanical properties of the precipitation phase of aluminum alloys. L12-structured nanoprecipitates can improve the coarsening and creep resistance of Al-Si eutectic alloys. Zirconium gives the L12 strengthened alloy the most significant coarsening resistance. Due to its smaller intrinsic diffusion rate compared to erbium and scandium elements, the thermally stable Zr-rich shell can inhibit the diffusion of scandium and improve the anti-organization property of the nanoprecipitate phase. Summary of the invention

[0004] The present invention aims to solve the technical problem of poor strength and heat resistance of the current Al-Si eutectic alloy, and provides a method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-element microalloying and heat treatment regulation.

[0005] The method of the present invention for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-element microalloying and heat treatment regulation is carried out according to the following steps:

[0006] 1. Weighing raw materials according to the mass percentage of each element in the Al-Si eutectic alloy, the raw materials are pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy, Al-10Mg master alloy, Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy, Al-5Sc master alloy, Al-5Ti master alloy and Al-2Sr master alloy; and then drying a total of 11 raw materials;

[0007] The mass percentage of each element in the Al-Si eutectic alloy is as follows: Si is 10% to 14%, Cu is 3% to 5.5%, Ni is 1% to 3%, Mg is 0.3% to 1.1%, Zr is 0.1% to 0.5%, V is 0.08% to 0.25%, Er is 0.1% to 0.4%, Sc is 0.1% to 0.4%, Ti is 0.05% to 0.25%, Sr is 0.01% to 0.1%, and the balance is Al;

[0008] 2. ①: Put the dried pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy and Al-10Mg master alloy into a graphite crucible, and heat them to 800℃~810℃ with the furnace until all the alloys are melted; then add the dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy, and adjust the furnace temperature to 750℃~760℃ and keep it warm for 10min~20min after all are melted, and then add the dried Al-5Ti master alloy and Al-2Sr master alloy into the melt in turn and keep it warm until all are melted;

[0009] ②: Adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 20min~30min; pour the melt into a steel mold at 200℃~210℃ for gravity casting, and cut it into blocks after solidification at room temperature;

[0010] ③: Put the cut alloy block back into the furnace body and repeat the above process ② once;

[0011] ④: Put the cut alloy block back into the furnace, adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 30min~40min, then introduce argon into the melt and perform ultrasonic degassing at the same time, the degassing time is 2min~3min; then use squeeze casting to prepare ingots, the steel mold temperature is 200℃~300℃, the squeeze casting specific pressure is 300MPa~400MPa, keep the pressure for 50s~60s and immediately take out and water quench;

[0012] ⑤: The ingot prepared in the above ④ is solution treated at 490℃~530℃ for 2h~8h, and the ingot after solution is water quenched; then, it is aged at 180℃~220℃ for 2h~10h to obtain Al-Si eutectic alloy.

[0013] The present invention prepares a high-strength heat-resistant aluminum alloy by controlling the microstructure, solute elements and nanoscale second phase through a reasonable heat treatment process based on a microalloyed Al-Si eutectic alloy. The multi-component microalloyed Al-Si eutectic alloy prepared by the present invention has excellent high-temperature strength and can adapt to more complex service conditions compared to other Al-Si eutectic heat-resistant aluminum alloys of the same series.

[0014] The alloy prepared by the present invention needs to go through the process of smelting-remelting-T6 heat treatment to achieve high hardness and high strength, wherein the organization morphology and the second phase are regulated by the T6 heat treatment process, and the addition of trace metal elements results in a unique microstructure of twinning + stacking faults, and (Al, Si)3(Zr, Ti, V)-D0 22 / D0 23 The core-shell structure of a large amount of Al3(Zr,Er,Sc)-L12 significantly improves the high-temperature strength of the Al-Si heat-resistant aluminum alloy; the introduction of multiple microalloying alloying elements significantly increases the volume fraction of the Al3(Zr,Er,Sc)-L12 phase, enhances the consistent effect of twins + stacking faults on dislocations, and meets the high-temperature service conditions of the Al-Si eutectic alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The DSC curve of the alloy after step 2④ of experiment 1;

[0016] Figure 2 This is the SEM image of the alloy after step 2④ of experiment 1;

[0017] Figure 3 This is the transmission bright field image of the L12 phase of the alloy after step 2④ of experiment 1;

[0018] Figure 4 This is the transmission bright field image of the interaction between alloy dislocation, twin and + stacking fault after step 2④ of experiment 1;

[0019] Figure 5 This is the microstructure of the alloy after water quenching in step 2⑤ of experiment 1;

[0020] Figure 6 This is the microstructure of the Al-Si eutectic alloy after aging in step 2 of experiment 1;

[0021] Figure 7 This is the high temperature tensile mechanical properties data of the Al-Si eutectic alloy after solid solution + aging at 250~350℃ in experiment 1. DETAILED DESCRIPTION

[0022] Specific implementation method 1: This implementation method is a method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-element microalloying and heat treatment regulation, which is specifically carried out in the following steps:

[0023] 1. Weighing raw materials according to the mass percentage of each element in the Al-Si eutectic alloy, the raw materials are pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy, Al-10Mg master alloy, Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy, Al-5Sc master alloy, Al-5Ti master alloy and Al-2Sr master alloy; and then drying a total of 11 raw materials;

[0024] The mass percentage of each element in the Al-Si eutectic alloy is as follows: Si is 10% to 14%, Cu is 3% to 5.5%, Ni is 1% to 3%, Mg is 0.3% to 1.1%, Zr is 0.1% to 0.5%, V is 0.08% to 0.25%, Er is 0.1% to 0.4%, Sc is 0.1% to 0.4%, Ti is 0.05% to 0.25%, Sr is 0.01% to 0.1%, and the balance is Al;

[0025] 2. ①: Put the dried pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy and Al-10Mg master alloy into a graphite crucible, and heat them to 800℃~810℃ with the furnace until all the alloys are melted; then add the dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy, and adjust the furnace temperature to 750℃~760℃ and keep it warm for 10min~20min after all are melted, and then add the dried Al-5Ti master alloy and Al-2Sr master alloy into the melt in turn and keep it warm until all are melted;

[0026] ②: Adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 20min~30min; pour the melt into a steel mold at 200℃~210℃ for gravity casting, and cut it into blocks after solidification at room temperature;

[0027] ③: Put the cut alloy block back into the furnace body and repeat the above process ② once;

[0028] ④: Put the cut alloy block back into the furnace, adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 30min~40min, then introduce argon into the melt and perform ultrasonic degassing at the same time, the degassing time is 2min~3min; then use squeeze casting to prepare ingots, the steel mold temperature is 200℃~300℃, the squeeze casting specific pressure is 300MPa~400MPa, keep the pressure for 50s~60s and immediately take out and water quench;

[0029] ⑤: The ingot prepared in the above ④ is solution treated at 490℃~530℃ for 2h~8h, and the ingot after solution is water quenched; then, it is aged at 180℃~220℃ for 2h~10h to obtain Al-Si eutectic alloy.

[0030] Specific implementation method 2: This implementation method is different from specific implementation method 1 in that the purity of the pure aluminum in step 1 is 99.9%. Other aspects are the same as those of specific implementation method 1.

[0031] Specific implementation method 3: This implementation method is different from specific implementation method 1 or 2 in that the drying condition in step 1 is: keeping the temperature at 300° C. for 2 h to 3 h. The rest is the same as specific implementation method 1 or 2.

[0032] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the mass percentage of each element in the Al-Si eutectic alloy described in step 1 is as follows: Si is 12% to 13%, Cu is 4% to 5%, Ni is 2% to 2.5%, Mg is 0.6% to 0.9%, Zr is 0.15% to 0.25%, V is 0.1% to 0.2%, Er is 0.15% to 0.25%, Sc is 0.15% to 0.25%, Ti is 0.1% to 0.2%, Sr is 0.02% to 0.06%, and the balance is Al. Others are the same as those in specific embodiments 1 to 3.

[0033] Specific embodiment 5: This embodiment is different from specific embodiment 4 in that the inner wall of the graphite crucible described in step 2 is coated with ZnO. The rest is the same as specific embodiment 4.

[0034] Specific embodiment 6: This embodiment is different from specific embodiment 5 in that: in step 2①, dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy are added, and after all are melted, the furnace temperature is adjusted to 750°C and kept warm for 15 minutes, and then the dried Al-5Ti master alloy and Al-2Sr master alloy are added to the melt in sequence and kept warm until all are melted. The rest is the same as specific embodiment 5.

[0035] Specific implementation method 7: This implementation method is different from specific implementation method 6 in that: in step 2②, the furnace temperature is adjusted to 710℃ and kept warm for 10 minutes, the melt is fully stirred with a stirring rod, and then kept warm at 710℃ for 20 minutes; the melt is poured into a steel mold at 200℃ for gravity casting, and cut into blocks after solidification at room temperature. The rest is the same as specific implementation method 6.

[0036] Specific implementation eight: This implementation differs from specific implementation seven in that: in step two (4), the cut alloy block is put back into the furnace, the furnace temperature is adjusted to 710°C and kept warm for 10 minutes, the melt is fully stirred with a stirring rod, and then kept warm at 710°C for 30 to 40 minutes, and then argon is introduced into the melt and ultrasonic degassing is performed simultaneously, and the degassing time is 2 minutes. The rest is the same as specific implementation seven.

[0037] Specific embodiment 9: This embodiment is different from specific embodiment 8 in that: in step 2④, the ingot is prepared by squeeze casting, the steel mold temperature is 200°C, the squeeze casting specific pressure is 300MPa, and the ingot is taken out and water quenched immediately after holding the pressure for 50s. The rest is the same as specific embodiment 8.

[0038] Specific embodiment 10: This embodiment differs from specific embodiment 9 in that: in step 2⑤, the ingot is subjected to solution treatment at 510°C for 8 hours, and the ingot after solution treatment is water quenched; then, an aging treatment is performed at 200°C for 6 hours to obtain an Al-Si eutectic alloy. The rest is the same as specific embodiment 9.

[0039] The present invention is verified by the following tests:

[0040] Experiment 1: This experiment is a method for preparing high-strength and heat-resistant Al-Si eutectic alloy by multi-element microalloying and heat treatment regulation, which is specifically carried out in the following steps:

[0041] 1. Weigh raw materials according to the mass percentage of each element in the Al-Si eutectic alloy, wherein the raw materials are pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy, Al-10Mg master alloy, Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy, Al-5Sc master alloy, Al-5Ti master alloy and Al-2Sr master alloy; then dry a total of 11 raw materials, and the drying conditions are: keep warm at 300° C. for 2 h to 3 h; the purity of the pure aluminum is 99.9%;

[0042] The mass percentage of each element in the Al-Si eutectic alloy is as follows: Si is 13.2%, Cu is 4.9%, Ni is 2.2%, Mg is 0.76%, Zr is 0.18%, V is 0.22%, Er is 0.19%, Sc is 0.23%, Ti is 0.09%, Sr is 0.03%, and the balance is aluminum;

[0043] 2. ①: Put the dried pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy and Al-10Mg master alloy into a graphite crucible, and heat them to 800°C until all the alloys are melted; then add the dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy, and adjust the furnace temperature to 750°C and keep it warm for 15 minutes after all the alloys are melted, and then add the dried Al-5Ti master alloy and Al-2Sr master alloy into the melt in turn and keep it warm until all the alloys are melted; the inner wall of the graphite crucible is coated with ZnO;

[0044] ②: Adjust the furnace temperature to 710℃ and keep it warm for 15 minutes, use a stirring rod to fully stir the melt, and then keep it warm at 710℃ for 25 minutes; pour the melt into a 200℃ steel mold for gravity casting, and cut it into blocks after solidification at room temperature;

[0045] ③: Put the cut alloy block back into the furnace body and repeat the above process ② once;

[0046] ④: Put the cut alloy block back into the furnace, adjust the furnace temperature to 710℃ and keep it warm for 15min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃ for 35min, then introduce argon into the melt and perform ultrasonic degassing at the same time, the degassing time is 2.5min; then use squeeze casting to prepare the ingot, the steel mold temperature is 200℃, the squeeze casting specific pressure is 350MPa, keep the pressure for 55s and immediately take it out for water quenching;

[0047] ⑤: The ingot prepared in ④ above is subjected to a solution treatment at 510°C for 8 hours, and the ingot after the solution treatment is water quenched; then an aging treatment is performed at 200°C for 6 hours to obtain an Al-Si eutectic alloy.

[0048] The alloy after step 2④ of experiment 1 was subjected to DSC test. Figure 1 As shown, the solidus point and liquidus point of the heat-resistant aluminum alloy are 535.2°C and 583.6°C respectively.

[0049] Figure 2This is the SEM image of the alloy after step 2④ of experiment 1. It can be seen that the prepared heat-resistant aluminum alloy structure is mainly eutectic silicon, needle-shaped Al7Cu4Ni, AlCuSc, and massive (Al,Si)3(Zr,Ti,V)-D0 22 / D0 23 And Al3(Er,Sc)-L12.

[0050] Figure 3 This is the transmission bright field image of the L12 phase of the alloy after step 2④ of experiment 1. A large number of Al3(Zr, Er, Sc)-L12 phase pinning dislocations with good resistance appeared in the transmission structure of the aluminum alloy.

[0051] Figure 4 This is the transmission bright field image of the interaction between alloy dislocation, twin and + stacking fault after step 2④ of experiment 1. The transmission image shows that twin and stacking fault appear simultaneously in the heat-resistant Al-Si eutectic alloy matrix after multi-element microalloying. The morphology of twin + stacking fault is as follows: Figure 4 In the black needle-shaped area, the needle-shaped twins + stacking faults have a strong hindering effect on the dislocations in the matrix.

[0052] Figure 5 This is the microstructure diagram of the alloy after water quenching in step 2⑤ of experiment 1. It can be seen that the structure of the Al-Si eutectic heat-resistant alloy after solid solution is significantly improved, the needle-shaped second phase structure is transformed into a rounded short rod, the cutting effect on the matrix is ​​significantly reduced, and the eutectic Si is also transformed into a spherical shape.

[0053] Figure 6 This is the microstructure of the Al-Si eutectic alloy after aging in step 2 of experiment 1. It can be seen that the second phase after aging re-precipitates into a shorter needle-like phase and a smaller particle phase.

[0054] The Al-Si eutectic alloy after solid solution + aging in Experiment 1 was prepared as a standard high temperature tensile specimen, and high temperature tensile tests were carried out at 250℃, 300℃ and 350℃ respectively. The measured high temperature tensile curves are Figure 7 As shown, specific tensile data at different temperatures are listed in Table 1, and it can be seen that the multi-component microalloyed Al-Si eutectic alloy prepared by the present invention has excellent high temperature strength.

[0055] Test temperature tensile strength Elongation 250℃ 336.7MPa 4.42％ 300℃ 261.6MPa 4.24％ 350℃ 146.6MPa 4.73％

Claims

1. A method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment regulation, characterized in that The method for preparing high-strength and heat-resistant Al-Si eutectic alloy by multi-element microalloying and heat treatment regulation is carried out in the following steps:

1. Weighing raw materials according to the mass percentage of each element in the Al-Si eutectic alloy, the raw materials are pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy, Al-10Mg master alloy, Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy, Al-5Sc master alloy, Al-5Ti master alloy and Al-2Sr master alloy; and then drying a total of 11 raw materials; The mass percentage of each element in the Al-Si eutectic alloy is as follows: Si is 10% to 14%, Cu is 3% to 5.5%, Ni is 1% to 3%, Mg is 0.3% to 1.1%, Zr is 0.1% to 0.5%, V is 0.08% to 0.25%, Er is 0.1% to 0.4%, Sc is 0.1% to 0.4%, Ti is 0.05% to 0.25%, Sr is 0.01% to 0.1%, and the balance is Al; 2. ①: Put the dried pure aluminum, Al-30Si master alloy, Al-20Cu master alloy, Al-10Ni master alloy and Al-10Mg master alloy into a graphite crucible, and heat them to 800℃~810℃ with the furnace until all the alloys are melted; then add the dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy, and adjust the furnace temperature to 750℃~760℃ and keep it warm for 10min~20min after all are melted, and then add the dried Al-5Ti master alloy and Al-2Sr master alloy into the melt in turn and keep it warm until all are melted; ②: Adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 20min~30min; pour the melt into a steel mold at 200℃~210℃ for gravity casting, and cut it into blocks after solidification at room temperature; ③: Put the cut alloy block back into the furnace body and repeat the above process ② once; ④: Put the cut alloy block back into the furnace, adjust the furnace temperature to 710℃~720℃ and keep it warm for 10min~20min, use a stirring rod to fully stir the melt, and then keep it warm at 710℃~720℃ for 30min~40min, then introduce argon into the melt and perform ultrasonic degassing at the same time, the degassing time is 2min~3min; then use squeeze casting to prepare ingots, the steel mold temperature is 200℃~300℃, the squeeze casting specific pressure is 300MPa~400MPa, keep the pressure for 50s~60s and immediately take out and water quench; ⑤: The ingot prepared in the above ④ is solution treated at 490℃~530℃ for 2h~8h, and the ingot after solution is water quenched; then, it is aged at 180℃~220℃ for 2h~10h to obtain Al-Si eutectic alloy.

2. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that The purity of the pure aluminum described in step 1 is 99.9%.

3. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that The drying conditions in step 1 are: keeping warm at 300°C for 2h to 3h.

4. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that The mass percentage of each element in the Al-Si eutectic alloy described in step 1 is as follows: Si is 12% to 13%, Cu is 4% to 5%, Ni is 2% to 2.5%, Mg is 0.6% to 0.9%, Zr is 0.15% to 0.25%, V is 0.1% to 0.2%, Er is 0.15% to 0.25%, Sc is 0.15% to 0.25%, Ti is 0.1% to 0.2%, Sr is 0.02% to 0.06%, and the balance is Al.

5. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that The inner wall of the graphite crucible described in step 2 is coated with ZnO.

6. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that In step 2①, the dried Al-5Zr master alloy, Al-5V master alloy, Al-5Er master alloy and Al-5Sc master alloy are added. After all of them are melted, the furnace temperature is adjusted to 750°C and kept warm for 15 minutes. Then, the dried Al-5Ti master alloy and Al-2Sr master alloy are added to the melt in turn and kept warm until all of them are melted.

7. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that In step 2②, the furnace temperature is adjusted to 710°C and kept warm for 10 minutes, the melt is fully stirred with a stirring rod, and then kept warm at 710°C for 20 minutes; the melt is poured into a 200°C steel mold for gravity casting, and cut into blocks after solidification at room temperature.

8. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that In step 2④, the cut alloy block is put back into the furnace body, the furnace temperature is adjusted to 710°C and kept warm for 10 minutes, the melt is fully stirred with a stirring rod, and then kept warm at 710°C for 30 to 40 minutes, and then argon is introduced into the melt and ultrasonic degassing is performed at the same time, and the degassing time is 2 minutes.

9. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that In step 2④, the ingot is prepared by extrusion casting, the steel mold temperature is 200° C., the extrusion casting specific pressure is 300 MPa, and the ingot is taken out and water quenched immediately after holding the pressure for 50 seconds.

10. The method for preparing a high-strength and heat-resistant Al-Si eutectic alloy by multi-component microalloying and heat treatment control according to claim 1, characterized in that In step 2⑤, the ingot is solution treated at 510°C for 8 hours, and the ingot after solution treatment is water quenched; then, an aging treatment is performed at 200°C for 6 hours to obtain an Al-Si eutectic alloy.

Images