Catalytic Hf modified Al-Ce-Zr-Sc series heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement and preparation method of catalytic Hf modified Al-Ce-Zr-Sc series heat-resistant aluminum alloy

Abstract

The invention relates to a catalytic Hf modified Al-Ce-Zr-Sc series heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement and a preparation method thereof, and belongs to the technical field of metal material processing and alloy design, the aluminum alloy comprises the following components in percentage by mass: 8-10% of Ce, 0.2-0.4% of Zr, 0.05-0.15% of Sc, 0.08-0.15% of Hf and lt, and the balance of Al and inevitable impurities, the preparation method comprises the steps of smelting and casting, hot extrusion, homogenization treatment and aging treatment. An Hf element is introduced as an interface catalyst, a quaternary nanophase Al3 (Sc, Zr and Hf) with a high melting point and a low diffusion coefficient is formed through catalysis, a multi-scale strengthened structure of a fibrous Al11Ce3 phase, a subcrystal matrix and a dispersed nanophase is constructed, the tensile strength of the alloy at the high temperature of 400 DEG C reaches 285 + / -10 MPa, and the tensile strength of the alloy at the high temperature of 400 DEG C reaches 285 + / -10 MPa. The aluminum alloy can meet the use requirements of key components such as aerospace engine compartment assemblies and turbocharger shells serving for a long time at the temperature interval of 400-500 DEG C, the cost is lower than that of a traditional aluminum alloy with the high Sc content, and the industrialization difficulty is low.

Description

Technical Field

[0001] This invention belongs to the field of metal material processing and alloy design technology, specifically referring to a catalytic Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement and its preparation method. Background Technology

[0002] Aluminum alloys, as an important lightweight structural material, have become crucial in aerospace, advanced power systems, and other fields due to their low density, high specific strength, and excellent processing and formability. However, traditional 2-series, 6-series, and 7-series aluminum alloys have significant limitations: when the operating temperature exceeds 200℃, the strengthening phases, such as θ′ and β″, tend to coarsen or dissolve, accompanied by recrystallization softening and enhanced grain boundary slip, leading to a rapid degradation of mechanical properties and severely limiting their service life in medium- and high-temperature environments.

[0003] Existing technology CN111893353A discloses a high-strength heat-resistant aluminum alloy mainly composed of Al-Si-Fe-Cu-Mg elements, with a room temperature tensile strength of approximately 325 MPa. However, its strength drops to only 190 MPa at 350℃, exhibiting significant high-temperature strength degradation. This demonstrates that the strength of traditional aluminum alloys decreases sharply above 300–350℃, making it difficult to meet the requirements for long-term high-temperature service. To improve thermal stability, heat-resistant aluminum alloys based on Ce have been developed in recent years, in which Al... 11 The Ce3 phase exhibits high thermal stability. However, under as-cast conditions, this phase tends to form coarse, blocky, or network-like segregated structures, resulting in low room-temperature strength. Furthermore, traditional hot working processes are insufficient to effectively refine its microstructure.

[0004] Prior art CN113416870B discloses an Al–Ce–Sc–Zr heat-resistant aluminum alloy, which incorporates 12–16% Ce into Al. 11 The alloy incorporates a Ce3 eutectic phase with the addition of 0.3–0.8% Sc and 0.15–0.32% Zr to precipitate nano-sized Al3(Sc,Zr) phases. Through casting and heat treatment, this alloy achieves a composite microstructure of "coarse eutectic + dispersed precipitation," reaching a tensile strength of 287 MPa at 350°C. However, such alloys still require the addition of a considerable proportion of Sc (approximately 0.4–0.5%) to ensure sufficient nano-precipitation strengthening, resulting in high cost and resource dependence. Furthermore, when the operating temperature is further increased to above 400°C, the nano-sized Al3(Sc,Zr) precipitates tend to continue coarsening, making long-term stable strengthening difficult to guarantee. These factors collectively limit the practical application performance of existing heat-resistant aluminum alloys in high-temperature environments.

[0005] To address the aforementioned technical problems, this invention proposes a novel synergistic strategy of alloy composition and heat treatment—in particular, the innovative introduction of an appropriate amount of hafnium (Hf) as an interfacial catalyst to promote the nucleation and stabilization of quaternary nanophases, thereby effectively suppressing the high-temperature coarsening of precipitated phases. This has significant practical value for promoting the application of high-performance aluminum alloys in high-temperature fields. Summary of the Invention

[0006] To overcome some of the problems mentioned in the background above, the present invention provides a catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement and its preparation method, so as to at least partially solve the above problems.

[0007] According to the technical solution of the present invention, a catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement is provided. The aluminum alloy contains, by mass percentage: 8-10 wt.% Ce, 0.2-0.4 wt.% Zr, 0.05-0.15 wt.% Sc, 0.08-0.15 wt.% Hf, and <0.1 wt.% unavoidable impurity elements, with the balance being Al.

[0008] The microstructure of the aluminum alloy comprises: equiaxed grains with an average size of 0.3-2.0 μm, and fibrous eutectic Al continuously distributed along the processing direction. 11 Ce3 phase and diffusely distributed nanoscale Al3(Sc,Zr,Hf) precipitates.

[0009] Preferably, the nanoscale Al3(Sc,Zr,Hf) precipitates have a core-shell structure, wherein Sc is enriched in the core and Zr and Hf are enriched in the shell.

[0010] Furthermore, the present invention also provides a method for preparing a catalytically modified Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement as described above, the method comprising the following steps:

[0011] S1) The raw materials are melted in a vacuum induction melting furnace and cast into as-cast alloy ingots;

[0012] S2) The cast alloy ingot is hot-extruded at 400–450°C, with a deformation of more than 80%;

[0013] S3) Homogenize the extruded profiles by holding them at 480-520℃ for 5-10 hours.

[0014] S4) The homogenized profiles are subjected to aging treatment at 180-220℃ for 20-40 hours to obtain the final product.

[0015] Furthermore, the smelting process in step S1 includes:

[0016] Place the raw materials in a vacuum induction melting furnace and evacuate to a vacuum level of 6×10⁻⁶. -3 After Pa, high-purity argon gas is introduced for protection, and the mixture is heated to 750-800℃ to completely melt the raw material. The mixture is then repeatedly melted 2-3 times to promote homogenization of the composition. After standing, it is poured into a graphite mold preheated to 200-300℃.

[0017] Furthermore, in step S2, the cast alloy ingot is homogenized at 450°C for 8-12 hours before hot extrusion, and the extrusion ratio is 10:1 to 20:1.

[0018] Furthermore, in step S3, the homogenization process is carried out at 480–500°C for 6–8 hours.

[0019] Furthermore, the aging treatment in step S4 is carried out at 200-220°C for 30-40 hours.

[0020] Furthermore, the purity of the pure aluminum in the raw material is above 99.99%.

[0021] On the other hand, the present invention also provides an application of the catalytic Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy as described above, wherein the aluminum alloy is used for components such as turbocharger housings and aircraft engine nacelle assemblies that have been in long-term service in the temperature range of 400-500℃.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention innovatively introduces Hf element as an "interfacial catalyst," through its interaction with Al3(Sc,Zr) phase. 11 Selective segregation at the Ce3 phase heterostructure significantly lowers the nucleation energy barrier of the quaternary nanophase Al3(Sc,Zr,Hf). This quaternary nanophase exhibits a high melting point and a low intrinsic diffusion coefficient, with a coarsening rate constant K ≤ 10 under long-term exposure at 400℃. -3 m 3 / s, which is an order of magnitude lower than that of traditional nanophases, fundamentally solving the technical problem of coarsening and instability of reinforced phases at high temperatures.

[0024] This invention utilizes a multi-stage synergistic process involving deformation, interfacial catalysis, and nanophase stabilization to construct a unique "fibrous Al" structure. 11 The alloy exhibits a multi-scale strengthening microstructure consisting of Ce3 phase, subcrystalline matrix, and nanoscale Al3(Sc,Zr,Hf) phase. This structure enables the alloy to achieve a tensile strength of 285±10 MPa at 400℃.

[0025] This invention optimizes the composition ratio, controlling the content of expensive Sc element to 0.05-0.15%, and uses low-cost Hf element as a key additive, resulting in an overall alloy cost significantly lower than traditional high-Sc content aluminum alloys. This alloy can be produced using conventional hot-working equipment, greatly reducing industrialization difficulties and production costs, and facilitating the large-scale industrial application of high-performance heat-resistant aluminum alloys. Attached Figure Description

[0026] Figure 1 The image shows the microstructure of the Al-8Ce-0.2Zr-0.05Sc alloy after heat treatment in Example 1.

[0027] Figure 2 The image shows the microstructure of the Al-9Ce-0.3Zr-0.1Sc alloy after heat treatment in Example 2.

[0028] Figure 3 The image shows the microstructure of the Al-10Ce-0.4Zr-0.15Sc alloy after heat treatment in Example 3.

[0029] Figure 4 The average tensile strength at 400°C is compared between the heat-treated alloys and the corresponding cast alloys prepared in Examples 1-3. Detailed Implementation

[0030] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0031] The purpose of this invention is to provide a novel catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy and its thermomechanical treatment method, to overcome the problems commonly found in existing Al-Ce and Sc / Zr nanoprecipitation-strengthened aluminum alloys in high-temperature environments, such as coarsening and instability of the strengthening phase, recrystallization softening, and insufficient high-temperature creep resistance. By scientifically constructing a synergistic mechanism between Ce, Zr, Sc, and Hf, combined with an interfacial catalytic regulation strategy, multi-scale synergistic strengthening of the nanoprecipitated phase, eutectic phase, and subcrystalline structure is achieved.

[0032] To achieve the above objectives, the present invention proposes the following technical solution:

[0033] A thermomechanical treatment method for catalytically Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloys, wherein the aluminum alloy comprises, by mass percentage:

[0034] Ce: 8–10 wt.%, used to form highly thermally stable Al 11Ce3 fibrous reinforcing phase;

[0035] Zr: 0.2–0.4 wt.%, as a microalloying element to induce the low-temperature precipitation of Al3Zr nanophase;

[0036] Sc: 0.05-0.15 wt.%, reduces the energy barrier of nanophase nuclei and promotes uniform precipitation;

[0037] Hf: 0.08-0.15 wt.%, interfacial catalysis, enhancing the thermal stability of nanophases.

[0038] Total impurities ≤0.1 wt.%, preferably ≤0.05 wt.%;

[0039] The balance is aluminum.

[0040] The method includes the following steps:

[0041] Alloy smelting and ingot preparation: Pure aluminum, aluminum-cerium master alloy, aluminum-zirconium master alloy, aluminum-scandium master alloy, and aluminum-hafnium master alloy were weighed according to the specified proportions and loaded into a high-temperature resistant quartz tube. A layered filling method was used to ensure uniform mixing. The quartz tube was placed in a vacuum high-frequency induction melting furnace, and a vacuum of 6 × 10⁻⁶ was applied. -3 Below Pa, purge with high-purity argon for protection and repeat the degassing operation twice.

[0042] The raw materials are heated to 750-800℃ to completely melt them, held at that temperature for 10-15 minutes for refining and settling, and then repeatedly melted 2-3 times while controlling the cooling rate to improve the uniformity of the composition. Finally, the mixture is poured into a graphite mold preheated to 200-300℃ to obtain a dense, macroscopically defect-free cast alloy ingot.

[0043] High-temperature hot extrusion treatment: The cast alloy ingot is homogenized at 450℃ for 8–12 hours, followed immediately by hot extrusion at 400–450℃, with a deformation of more than 80% and an extrusion ratio controlled between 10:1 and 20:1. This process effectively breaks down primary Al atoms. 11 The Ce3 phase causes it to elongate along the deformation direction and be distributed in a fibrous manner, while introducing high-density dislocations, which provide driving force for subsequent substructure evolution.

[0044] Homogenization treatment: Homogenization annealing is applied to the extruded profiles: the extruded profiles are homogenized by holding at 480-520℃ for 5-10 hours, preferably at 500-520℃ for 6-8 hours, and then air-cooled to room temperature. This step, through medium-temperature long-term holding, allows elements such as Zr, Sc, and Hf to fully diffuse into the aluminum matrix, eliminates micro-segregation, and creates thermodynamic conditions for the uniform precipitation of the quaternary nanophase (Al3(Sc,Zr,Hf)).

[0045] Aging Treatment: The homogenized profiles are subjected to low-temperature aging treatment by holding at 180-220℃ for 20-40 hours, preferably at 200-220℃ for 30-40 hours, followed by air cooling to obtain the final alloy product. Within this temperature range, long-term aging promotes the segregation of Hf atoms in the Al3(Sc,Zr) phase and Al... 11 The heterostructure of Ce3 phase catalyzes the formation of quaternary nanophase Al3(Sc,Zr,Hf); resulting in "fibrous Al". 11 A multi-scale reinforced structure consisting of "Ce3 phase + subcrystalline matrix + dispersed nanophase".

[0046] Example 1

[0047] A method for preparing an Al-Ce-Zr-Sc heat-resistant aluminum alloy includes the following steps:

[0048] Weigh out 8 wt.% cerium, 0.2 wt.% zirconium, 0.05 wt.% scandium, and 0.08 wt.% hafnium by weight, with the remainder being pure aluminum. Place the raw materials in a high-temperature resistant quartz tube with an inner diameter of 10 mm and a height of 80 mm. Place the quartz tube into a vacuum high-frequency induction melting furnace, ensuring uniform distribution of the raw materials to avoid segregation.

[0049] Vacuum was drawn until the pressure inside the furnace was 6×10. -3 The process involves evacuating the sample to 800°C and then filling it with 99.99% pure argon gas as a protective gas. This evacuation-argon filling process is repeated twice to completely remove oxygen. The sample is then heated to 800°C and held for 10 minutes to completely melt and homogenize the raw material. It is then cooled to 300°C, and this process is repeated three times to promote uniform composition and reduce porosity defects.

[0050] After melting, the sample was cooled in the furnace for 2 minutes, then the gas was released and the furnace lid was opened. The sample was then removed and cooled in air for 5 minutes. After the alloy sample had completely solidified, the as-cast Al-8Ce-0.2Zr-0.05Sc alloy was obtained. The ingot had a uniform microstructure and no macroscopic defects, laying the foundation for subsequent thermomechanical treatment.

[0051] The as-cast Al-8Ce-0.2Zr-0.05Sc alloy was hot-extruded at 450℃ with a deformation controlled at 90%. The temperature was kept stable during the extrusion process to break up the coarse phases in the as-cast state, form fibrous streamlines along the extrusion direction, and introduce high-density dislocations to provide a driving force for the formation of substructures.

[0052] The hot-extruded Al-8Ce-0.2Zr-0.05Sc alloy was homogenized by holding it at 500℃ for 8 hours to eliminate microsegregation and create thermodynamic conditions for the uniform precipitation of the quaternary nanophase (Al3(Sc,Zr,Hf)). Subsequently, the homogenized profile was subjected to low-temperature aging treatment by holding it at 200℃ for 30 hours, causing Hf atoms to segregate within the Al3(Sc,Zr) phase and Al... 11 The heterogeneous interface of Ce3 phase is catalyzed to form the quaternary nanophase Al3(Sc,Zr,Hf), which is then air-cooled to obtain the final alloy product.

[0053] Example 2

[0054] A method for preparing an Al-Ce-Zr-Sc heat-resistant aluminum alloy includes the following steps:

[0055] Weigh out 9 wt.% cerium, 0.3 wt.% zirconium, 0.1 wt.% scandium, and 0.12 wt.% hafnium by weight, with the remainder being pure aluminum. Place the raw materials in a high-temperature resistant quartz tube with an inner diameter of 10 mm and a height of 80 mm. Place the quartz tube into a vacuum high-frequency induction melting furnace, ensuring uniform distribution of the raw materials to avoid segregation.

[0056] Vacuum was drawn until the pressure inside the furnace was 6×10. -3 The process involves evacuating the sample to 800°C and then filling it with 99.99% pure argon gas as a protective gas. This evacuation-argon filling process is repeated twice to completely remove oxygen. The sample is then heated to 800°C and held for 10 minutes to completely melt and homogenize the raw material. It is then cooled to 300°C, and this process is repeated three times to promote uniform composition and reduce porosity defects.

[0057] After melting, the sample was cooled in the furnace for 2 minutes, then the gas was released and the furnace lid was opened. The sample was then removed and cooled in air for 5 minutes. After the alloy sample had completely solidified, the as-cast Al-9Ce-0.3Zr-0.1Sc alloy was obtained. The ingot had a uniform microstructure and no macroscopic defects, laying the foundation for subsequent thermomechanical treatment.

[0058] The as-cast Al-9Ce-0.3Zr-0.1Sc alloy was hot-extruded at 450℃ with a deformation controlled at 90%. The temperature was kept stable during the extrusion process to break up the coarse phases in the as-cast state, form fibrous streamlines along the extrusion direction, and introduce high-density dislocations to provide driving force for the formation of substructures.

[0059] The hot-extruded Al-9Ce-0.3Zr-0.1Sc alloy was homogenized by holding it at 500℃ for 8 hours to eliminate microsegregation and create thermodynamic conditions for the uniform precipitation of the quaternary nanophase (Al3(Sc,Zr,Hf)). Subsequently, the homogenized profile was subjected to low-temperature aging treatment by holding it at 200℃ for 30 hours, which caused Hf atoms to segregate within the Al3(Sc,Zr) phase and Al... 11 The heterogeneous interface of Ce3 phase is catalyzed to form the quaternary nanophase Al3(Sc,Zr,Hf), which is then air-cooled to obtain the final alloy product.

[0060] Example 3

[0061] A method for preparing an Al-Ce-Zr-Sc heat-resistant aluminum alloy includes the following steps:

[0062] Weigh out 10 wt.% cerium, 0.4 wt.% zirconium, 0.15 wt.% scandium, and 0.15 wt.% hafnium by weight, with the remainder being pure aluminum. Place the raw materials in a high-temperature resistant quartz tube with an inner diameter of 10 mm and a height of 80 mm. Place the quartz tube into a vacuum high-frequency induction melting furnace, ensuring uniform distribution of the raw materials to avoid segregation.

[0063] Vacuum was drawn until the pressure inside the furnace was 6×10. -3 The process involves evacuating the sample to 800°C and then filling it with 99.99% pure argon gas as a protective gas. This evacuation-argon filling process is repeated twice to completely remove oxygen. The sample is then heated to 800°C and held for 10 minutes to completely melt and homogenize the raw material. It is then cooled to 300°C, and this process is repeated three times to promote uniform composition and reduce porosity defects.

[0064] After melting, the sample was cooled in the furnace for 2 minutes, then the gas was released and the furnace lid was opened. The sample was then removed and cooled in air for 5 minutes. After the alloy sample had completely solidified, the as-cast Al-10Ce-0.4Zr-0.15Sc alloy was obtained. The ingot had a uniform microstructure and no macroscopic defects, laying the foundation for subsequent thermomechanical treatment.

[0065] The as-cast Al-10Ce-0.4Zr-0.15Sc alloy was hot-extruded at 450℃ with a deformation controlled at 90%. The temperature was kept stable during the extrusion process to break up the coarse phases in the as-cast state, form fibrous streamlines along the extrusion direction, and introduce high-density dislocations to provide driving force for the formation of substructures.

[0066] The hot-extruded Al-10Ce-0.4Zr-0.15Sc alloy was homogenized by holding it at 500℃ for 8 hours to eliminate microsegregation and create thermodynamic conditions for the uniform precipitation of the quaternary nanophase (Al3(Sc,Zr,Hf)). Subsequently, the homogenized profile was subjected to low-temperature aging treatment by holding it at 200℃ for 30 hours, causing Hf atoms to segregate within the Al3(Sc,Zr) phase and Al... 11 The heterogeneous interface of Ce3 phase is catalyzed to form the quaternary nanophase Al3(Sc,Zr,Hf), which is then air-cooled to obtain the final alloy product.

[0067] Microstructure images of the aluminum alloys prepared in Examples 1, 2, and 3 were acquired using a metallographic microscope. The results are as follows: Figures 1-3 As shown, the grain boundaries within the field of view are clear and complete, exhibiting a continuous network distribution. The matrix has a uniform color and no obvious compositional segregation, indicating a relatively uniform distribution of alloying elements. The figure also shows a large number of dark-colored granular secondary phases (corresponding to Al). 11 The Ce3 phase is uniformly dispersed in the aluminum matrix, and slight directional features are visible in the metallographic structure, indicating that the material has undergone directional hot deformation processing. However, this directionality is not obvious, indicating that the subsequent heat treatment effectively eliminated the processing texture.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement, characterized in that, The aluminum alloy contains, by mass percentage: 8-10 wt.% Ce, 0.2-0.4 wt.% Zr, 0.05-0.15 wt.% Sc, 0.08-0.15 wt.% Hf and <0.1 wt.% unavoidable impurity elements, with the balance being Al; The microstructure of the aluminum alloy comprises: equiaxed grains with an average size of 0.3-2.0 μm, and fibrous eutectic Al continuously distributed along the processing direction. 11 Ce3 phase and diffusely distributed nanoscale Al3(Sc,Zr,Hf) precipitates.

2. The catalytically modified Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 1, characterized in that, The nanoscale Al3(Sc,Zr,Hf) precipitates have a core-shell structure, with Sc enriched in the core and Zr and Hf enriched in the shell.

3. A method for preparing a catalytically modified Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement as described in any one of claims 1 or 2, characterized in that, The method includes the following steps: S1) The raw materials are melted in a vacuum induction melting furnace and cast into as-cast alloy ingots; S2) The cast alloy ingot is hot-extruded at 400–450°C, with a deformation of more than 80%; S3) Homogenize the extruded profiles by holding them at 480-520℃ for 5-10 hours. S4) The homogenized profiles are subjected to aging treatment at 180-220℃ for 20-40 hours to obtain the final product.

4. The method for preparing catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 3, characterized in that, The smelting process in step S1 includes: Place the raw materials in a vacuum induction melting furnace and evacuate to a vacuum level of 6×10⁻⁶. -3 After Pa, high-purity argon gas is introduced for protection, and the mixture is heated to 750-800℃ to completely melt the raw material. The mixture is then repeatedly melted 2-3 times to promote homogenization of the composition. After standing, it is poured into a graphite mold preheated to 200-300℃.

5. The method for preparing catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 3, characterized in that, In step S2, the cast alloy ingot is homogenized at 450°C for 8-12 hours before hot extrusion, and the extrusion ratio is 10:1 to 20:

1.

6. The method for preparing catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 3, characterized in that, In step S3, the homogenization process involves holding the temperature at 480–500°C for 6–8 hours.

7. The method for preparing catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 3, characterized in that, In step S4, the aging treatment is carried out at 200-220℃ for 30-40 hours.

8. The method for preparing catalytically modified Al-Ce-Zr-Sc heat-resistant aluminum alloy based on quaternary nanophase synergistic reinforcement according to claim 3, characterized in that, The purity of the aluminum in the raw material is above 99.99%.

9. An application of the catalytically modified Hf-modified Al-Ce-Zr-Sc heat-resistant aluminum alloy as described in any one of claims 1 or 2, characterized in that, The aluminum alloy is used for components such as turbocharger housings and aircraft engine nacelle assemblies that have been in long-term service in the temperature range of 400-500℃.

Images