High-extensibility aluminum alloy material easy to die-cast and high in flowability and preparation method thereof

Abstract

The invention discloses an aluminum alloy material easy to die-cast, high in fluidity and high in extensibility and a preparation method of the aluminum alloy material. The aluminum alloy material comprises, by mass, 6.5%-9% of Si, 0.3%-0.8% of Mg, 0.5%-1.0% of Mn, 0.1%-0.3% of Cu, 0.05%-0.15% of Ti, 0.01%-0.03% of Sr, 0.5%-1.5% of rubber powder, smaller than or equal to 0.15% of Fe and the balance Al and inevitable impurities. The preparation method comprises the following steps of raw material preparation, smelting, refining, trace element adding, die casting and heat treatment so as to obtain a final product. The proportion of all the components is reasonably controlled, and the modified rubber powder particles are added, so that the die-casting formability, ductility, impact toughness and damping performance of the die-casting aluminum alloy are remarkably improved.

Description

Technical Field

[0001] This invention relates to an aluminum alloy material and its preparation method, and more particularly to an easily die-cast, highly fluid, and highly ductile aluminum alloy material and its preparation method. Background Technology

[0002] Aluminum alloys are widely used in the automotive, aerospace, and 3C industries due to their advantages such as low density, high strength, and corrosion resistance. In the die-casting field, aluminum alloys are required to have good fluidity to ensure the forming quality of complex-shaped castings; at the same time, to meet the requirements of structural components, aluminum alloys also need to have high ductility and mechanical properties.

[0003] Currently, to ensure good fluidity and die-casting formability of die-cast aluminum alloys, a relatively high proportion of silicon is usually added (e.g., ADC12 contains 9%-12% Si). This leads to increased brittleness and generally low elongation (mostly 3%). Low elongation further manifests as insufficient toughness and poor impact resistance, making it unsuitable for structural components that withstand dynamic loads or require deformation. If high elongation is pursued, fluidity must be sacrificed to some extent, often resulting in difficulties in die-casting. Therefore, there is an urgent need to develop an aluminum alloy material that combines easy die-casting, high fluidity, and high elongation. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, this invention provides an easily die-cast, highly fluid, and highly ductile aluminum alloy material and its preparation method.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: an easily die-cast, highly fluid, and highly ductile aluminum alloy material, comprising the following components by mass percentage: The composition is as follows: Si 6.5%-9%, Mg 0.3%-0.8%, Mn 0.5%-1.0%, Cu 0.1%-0.3%, Ti 0.05%-0.15%, Sr 0.01%-0.03%, rubber powder 0.5%-1.5%, Fe ≤0.15%, with the remainder being Al and unavoidable impurities. The mass percentage of each element in the unavoidable impurities is ≤0.05%, and the total mass percentage of impurities is ≤0.15%.

[0006] Preferably, the aluminum alloy material comprises the following components by mass percentage:

[0007] The composition is as follows: Si 7%-8%, Mg 0.4%-0.6%, Mn 0.6%-0.8%, Cu 0.15%-0.25%, Ti 0.75%-0.1%, Sr 0.02%, rubber powder 1%, Fe ≤ 0.15%, with the remainder being Al and unavoidable impurities. The mass percentage of unavoidable impurities in each element is ≤ 0.05%, resulting in a total mass percentage of unavoidable impurities ≤ 0.15%.

[0008] Preferably, the rubber powder is an elastomer particle with a diameter of 10-50 μm, and the elastomer particle is nitrile rubber powder or silicone rubber powder.

[0009] A method for preparing an easily die-cast, highly fluid, and highly ductile aluminum alloy material includes the following steps: Step 1: Raw material preparation: Weigh Al, Si, Mg, Mn, Cu, Ti, Sr and rubber powder raw materials according to the mass percentage of easily die-cast, highly fluid and highly ductile aluminum alloy materials; The raw materials include: industrial pure aluminum, industrial silicon, magnesium ingots with a purity ≥99.7%, Al-Mn master alloy with Mn content of 10%-20%, Al-Cu master alloy with Cu content of 20%-30%, Al-Ti master alloy with Ti content of 5%-10%, Al-Sr master alloy with Sr content of 5%-10%, and the rubber powder is nitrile rubber powder or silicone rubber powder; the Fe element content in each of the above raw materials is ≤0.05%.

[0010] Step 2, Smelting: Add industrial pure aluminum to the smelting furnace and heat it to 720-750℃ to melt it. Then add industrial silicon, Al-Mn master alloy and Al-Cu master alloy in sequence and stir until completely melted. Control the smelting temperature to 730-760℃. Step 3, Refining: After the alloy liquid has completely melted, add the refining agent and refine at 730-750℃ for 20-30 minutes; Step 4: Add trace elements: Add the Al-Ti master alloy and Al-Sr master alloy to the refined alloy liquid, stir evenly, keep stirring, continue to add rubber powder, control the temperature at 720-740℃, and let stand for 5-10 minutes. Step 5, Die Casting: Control the temperature of the alloy liquid obtained in Step 4 at 680-720℃, control the mold temperature at 180-220℃, and use a die casting machine to perform die casting. Step 6, Heat Treatment: Perform T6 heat treatment on the die-cast parts to obtain the final product.

[0011] Preferably, in step two, the added industrial silicon is pre-crushed into particles with a particle size of 20-50 mm.

[0012] Preferably, in step three, the refining agent is a mixture of hexachloroethane and nitrogen, and the amount of refining agent added is 0.3%-0.5% of the mass of the alloy liquid.

[0013] Preferably, the refining agent is added as follows: the refining agent is placed in a graphite bell jar and slowly pressed into the bottom of the alloy liquid, while nitrogen gas is introduced at a flow rate of 0.5-1.0 L / min. After refining, the mixture is allowed to stand for 10-15 minutes to allow the inclusions to float to the surface.

[0014] Preferably, before adding rubber powder, the surface of the rubber powder particles is modified using a silane coupling agent.

[0015] Preferably, the silane coupling agent is an amino- or epoxy-containing silane coupling agent. The modification treatment method is as follows: rubber powder particles with qualified particle size are added to the silane coupling agent treatment solution, the mass ratio of particles to treatment solution is 1:5, and the mixture is stirred in a constant temperature water bath at 50°C for 60 minutes. After filtering out the rubber particles, they are pre-dried in an oven at 60°C for 1 hour, and then heated to 110°C and kept at that temperature for 2 hours, so that the silane coupling agent forms a stable siloxane film on the particle surface.

[0016] Preferably, in step five, the injection speed during die casting is 3-5 m / s, and the injection pressure is 60-80 MPa; the mold is preheated before die casting, and a release agent is sprayed onto the surface of the mold cavity.

[0017] This invention discloses an easily die-cast, highly fluid, and highly ductile aluminum alloy material and its preparation method. The prepared aluminum alloy material is particularly suitable for high-end applications requiring a balance between "die-cast fluidity" and "high ductility." The advantages of this design are:

[0018] 1) Low silicon and high purity design: The Si content is controlled at 6.5%-9% (lower than the 9%-12% of traditional ADC12), which reduces the brittle effect of free silicon phase. At the same time, through Sr modification, the coarse needle-like eutectic silicon is transformed into fine spheres, which significantly reduces the cutting effect on the matrix and ensures fluidity while improving the ductility of aluminum alloy material.

[0019] 2) Strict control of harmful elements: Fe content ≤ 0.15%, combined with 0.5%-1.0% Mn, can transform the harmful needle-like β-AlFeSi phase into the harmless α-Al(Fe,Mn)Si spherical phase, thus avoiding a decrease in toughness.

[0020] 3) Balance between strengthening and toughness: Mg and Si form an appropriate amount of Mg2Si strengthening phase, which improves strength without significantly reducing ductility; the addition of Ti refines the grains and further improves the plasticity of the material.

[0021] 4) Adding 1%-3% modified rubber powder can significantly improve the die casting formability, elongation, impact toughness and damping performance of die-cast aluminum alloys with a small sacrifice in strength. It utilizes the elastic characteristics of rubber to achieve the synergistic effect of "crack passivation-energy absorption-plastic deformation induction". Attached Figure Description

[0022] Figure 1 This is a schematic flowchart of the preparation method of the present invention. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] In die-cast aluminum alloys, there is a trade-off between easy die-casting fluidity and ductility: high silicon content can improve fluidity but increases brittleness, while improving ductility often requires reducing the proportion of brittle phases, which may affect fluidity. Based on this technical drawback, this invention proposes an easy-to-die-cast, high-fluidity, high-ductility aluminum alloy material, comprising the following components by mass percentage: The alloy composition is as follows: silicon (Si) 6.5%-9%, magnesium (Mg) 0.3%-0.8%, manganese (Mn) 0.5%-1.0%, copper (Cu) 0.1%-0.3%, titanium (Ti) 0.05%-0.15%, strontium (Sr) 0.01%-0.03%, rubber powder 0.5%-1.5%, iron (Fe) content controlled ≤0.15%, the remainder being aluminum (Al) and unavoidable impurities. Among these, the mass percentage of unavoidable impurities in the raw materials of each element is ≤0.05%, making the total mass percentage of unavoidable impurities in the entire aluminum alloy material system ≤0.15%.

[0025] This invention also proposes a more optimized formulation for a high-efficiency, easily die-cast aluminum alloy material, comprising the following components by mass percentage: The composition is as follows: Si 7%-8%, Mg 0.4%-0.6%, Mn 0.6%-0.8%, Cu 0.15%-0.25%, Ti 0.75%-0.1%, Sr 0.02%, rubber powder 1%, Fe ≤ 0.15%, with the remainder being Al and unavoidable impurities. The mass percentage of unavoidable impurities in each element is ≤ 0.05%, resulting in a total mass percentage of unavoidable impurities ≤ 0.15%.

[0026] For the aforementioned easily die-cast, highly fluid, and highly elongated aluminum alloys, Si is one of the main alloying elements, significantly improving the fluidity of the aluminum alloy, lowering the melting point, and enhancing die-casting performance. This invention controls the Si content between 6.5% and 9%. Compared to traditional die-cast aluminum alloys, such as ADC12 (Si content between 9% and 12%), the Si content of this invention is slightly reduced, ensuring sufficient fluidity of the aluminum alloy material (spiral flow ≥ 700 mm) while avoiding brittleness caused by excessive free silicon phase.

[0027] The addition of the metallic element Mn is mainly used to suppress the harmful effects of the Fe phase, ensuring that the content of the harmful metal Fe in this aluminum alloy system is ≤0.15%. The Fe phase will form brittle acicular phases such as β-AlFeSi, which will rupture the matrix and reduce toughness. The addition of 0.5%-1.0% Mn in this invention can combine with Fe to form α-Al(Fe,Mn)Si spherical phase, which replaces the brittle β phase, refines the grains, and improves the strength and toughness of the aluminum alloy.

[0028] The easy-to-cast, high-fluidity, and high-elongation aluminum alloy material proposed in this invention, with the addition of a small amount of metallic Cu, can improve the strength and heat resistance of the aluminum alloy material, and enhance its mechanical properties without significantly reducing its elongation.

[0029] For metallic Mg, it can form the Mg2Si strengthening phase with Si, which can improve the strength of aluminum alloys. Controlling the Mg content to 0.3%-0.8% can ensure a uniform distribution of the Mg2Si phase, improving strength without significantly reducing ductility.

[0030] Metallic titanium (Ti) acts as a grain refiner, refining the grain size. Ti reacts with Al to form TiAl3 compounds, whose crystal structures are similar to the aluminum matrix. These compounds can serve as heterogeneous nucleation sites during aluminum molten metal solidification, promoting the formation of finer, more uniform grains in the aluminum alloy, thereby improving its mechanical and casting properties. In this invention, a Ti content of 0.05%-0.15% results in a significant grain refinement effect.

[0031] Metallic Sr is a modifier that can transform eutectic silicon from coarse needle-like structures into fine fibrous or spherical structures, significantly improving the ductility of aluminum alloys. In this invention, the Sr content is controlled at 0.01%-0.03%, which can achieve a good modification effect.

[0032] Furthermore, for the high-efficiency, high-flowability aluminum alloy material proposed in this invention, rubber powder is added to the aluminum alloy material for modification. The high elasticity of the rubber is used to form a "soft-hard combination" composite structure with the aluminum alloy, thereby balancing the strength and plasticity of the aluminum alloy material.

[0033] The rubber powder of this invention uses elastomer particles with a particle size of 10-50 μm, such as nitrile rubber and silicone rubber. During the addition of trace elements, when the rubber powder is uniformly dispersed in the aluminum alloy matrix, it forms an interfacial bond with the aluminum matrix. The interfacial shear stress transfer creates localized stress concentration zones around the rubber powder particles, inducing plastic deformation rather than brittle fracture in the aluminum alloy matrix. Furthermore, due to the addition of rubber powder, during the die casting of the aluminum alloy material, the high elasticity of the rubber blunts the crack tips, thus meeting the molding requirements. The elastic deformation of the rubber can peel off from the matrix to form micropores, absorbing external impact energy, giving the aluminum alloy material good ductility. At the same time, the rubber powder can also act as a heterogeneous nucleation point during the die casting process, refining the grain and silicon phase structure of the aluminum alloy. The rubber particles can adsorb some of the micropores or inclusions generated during the casting process, maintaining the good ductility and die casting formability of the aluminum alloy material.

[0034] Therefore, by adding 0.5%-1.5% rubber powder, this invention can significantly improve the elongation, impact toughness and damping performance of die-cast aluminum alloys with a small sacrifice in strength, and achieve the synergistic effect of "crack passivation-energy absorption-plastic deformation induction" by utilizing the elastic characteristics of rubber.

[0035] Furthermore, it should be noted that this invention also utilizes silane coupling agents to perform surface modification treatment on rubber powder particles. The silane coupling agent selected is a silane coupling agent containing amino or epoxy groups, such as KH550 (γ-aminopropyltriethoxysilane) or KH560 (γ-glycidoxypropyltrimethoxysilane), which can form a stable bond with the active groups (such as hydroxyl groups and double bonds) on the rubber surface.

[0036] The modification process involves adding qualified rubber powder particles (those with a particle size between 10-50 μm) to a silane coupling agent treatment solution at a particle-to-solution mass ratio of 1:5. The mixture is stirred in a 50°C constant temperature water bath for 60 minutes to ensure sufficient contact between the particle surface and the treatment solution. After drying and curing, the rubber particles are filtered out, and excess treatment solution is removed. The particles are then pre-dried in a 60°C oven for 1 hour to remove surface moisture. The temperature is then raised to 110°C and maintained for 2 hours to allow the silane coupling agent to form a stable siloxane film on the particle surface.

[0037] The rubber particles treated by the above method form an organic-inorganic transition layer on their surface, which can effectively improve their compatibility with the aluminum alloy matrix and enhance the overall performance of the aluminum alloy material.

[0038] This invention also discloses a method for preparing an easily die-cast, highly fluid, and highly ductile aluminum alloy material, such as... Figure 1 As shown, the preparation steps include the following: Step 1: Raw material preparation: Weigh Al, Si, Mg, Mn, Cu, Ti, Sr and rubber powder raw materials according to the mass percentage of easily die-cast, highly fluid and highly ductile aluminum alloy materials; The sources of raw materials include: industrial pure aluminum with a purity of ≥99.7%, industrial silicon, magnesium ingots, Al-Mn master alloy with Mn content of 10%-20%, Al-Cu master alloy with Cu content of 20%-30%, Al-Ti master alloy with Ti content of 5%-10%, and Al-Sr master alloy with Sr content of 5%-10%. Using master alloys can facilitate accurate control of alloy element content and reduce burn-off.

[0039] The rubber powder is either nitrile rubber powder or silicone rubber powder; For the above raw materials, the Fe element content was determined to meet the standard, that is, the Fe element content is ≤0.05%.

[0040] Step 2, Smelting: Add industrial pure aluminum to the smelting furnace and heat it to 720-750℃ to melt it. Then add industrial silicon, Al-Mn master alloy and Al-Cu master alloy in sequence and stir until completely melted. Control the smelting temperature to 730-760℃. The added industrial silicon is pre-crushed into particles with a size of 20-50mm to improve the melting effect.

[0041] Step 3, Refining: After the alloy liquid has completely melted, add the refining agent and refine at 730-750℃ for 20-30 minutes; The refining agent used is a mixture of hexachloroethane and nitrogen, and the amount of refining agent added is 0.3%-0.5% of the mass of the alloy liquid.

[0042] The refining agent is added as follows: the refining agent is placed in a graphite bell jar and slowly pressed into the bottom of the alloy liquid while nitrogen gas is introduced at a flow rate of 0.5-1.0 L / min. This allows the refining agent to fully contact the alloy liquid and improves the refining effect. After refining, the mixture is allowed to stand for 10-15 minutes to allow the inclusions to float to the surface.

[0043] Step 4: Add trace elements: Add the Al-Ti master alloy and Al-Sr master alloy to the refined alloy liquid, stir evenly, keep stirring, continue to add rubber powder, control the temperature at 720-740℃, and let stand for 5-10 minutes. Considering the addition of modified rubber powder, the temperature range in the trace element addition process should be controlled at 720-740℃ to avoid excessive burning of trace elements.

[0044] Step 5, Die Casting: Control the temperature of the alloy liquid obtained in Step 4 at 680-720℃, control the mold temperature at 180-220℃, and use a die casting machine to perform die casting. The injection speed during die casting is 3-5 m / s, and the injection pressure is 60-80 MPa. Before die casting, the mold is preheated, and a release agent is sprayed on the surface of the mold cavity. The release agent is water-based and has a concentration of 5%-8% to ensure smooth demolding of the casting and improve the quality of the casting.

[0045] Step 6, Heat Treatment: The die-cast parts are subjected to T6 heat treatment to ensure uniform precipitation of the strengthening phase, thereby improving the strength and ductility of the alloy and obtaining the final die-cast product.

[0046] The performance of the easily die-cast, highly fluid, and highly ductile aluminum alloy material of the present invention will be further explained below with reference to specific embodiments.

[0047] Example 1

[0048] This embodiment discloses an easily die-cast, highly fluid, and highly ductile aluminum alloy material, comprising the following components by mass percentage: Si 6.5%, Mg 0.6%, Mn 0.5%, Cu 0.3%, Ti 0.1%, Sr 0.01%, rubber powder 1.5%, Fe 0.13%, unavoidable impurities 0.1%, Al 0.26%.

[0049] Example 2

[0050] This embodiment discloses an easily die-cast, highly fluid, and highly ductile aluminum alloy material, comprising the following components by mass percentage: Si 7%, Mg 0.4%, Mn 0.8%, Cu 0.15%, Ti 0.75%, Sr 0.02%, rubber powder 0.75%, Fe 0.12%, unavoidable impurities 0.12%, Al 89.89%.

[0051] Example 3

[0052] This embodiment discloses an easily die-cast, highly fluid, and highly ductile aluminum alloy material, comprising the following components by mass percentage: Si 9%, Mg 0.3%, Mn 1.0%, Cu 0.25%, Ti 0.15%, Sr 0.02%, rubber powder 1%, Fe 0.10%, unavoidable impurities 0.09%, Al 88.09%.

[0053] Example 4

[0054] This embodiment discloses an easily die-cast, highly fluid, and highly ductile aluminum alloy material, comprising the following components by mass percentage: Si 8%, Mg 0.8%, Mn 0.6%, Cu 0.1%, Ti 0.05%, Sr 0.03%, rubber powder 0.5%, Fe 0.09%, unavoidable impurities 0.11%, Al 89.72%.

[0055] According to the preparation method of the easily die-cast, highly fluid, and highly elongated aluminum alloy material disclosed in this invention, die castings were prepared according to the aluminum alloy material formulations of Examples 1 to 4. Before T6 heat treatment, the spiral fluidity and as-cast elongation of the aluminum alloy material were measured. After T6 heat treatment, the tensile strength and yield strength of the castings were measured. The measurement results are shown in the table below:

[0056] Therefore, the aluminum alloy material of the present invention has a spiral flow rate ≥800mm, a cast elongation rate ≥8%, an elongation rate ≥15% after T6 heat treatment, a tensile strength ≥280MPa and a yield strength ≥200MPa after T6 heat treatment, and has good flowability and continuity.

[0057] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention are also within the protection scope of the present invention.

Claims

1. A highly ductile aluminum alloy material that is easy to die-cast, has high fluidity, and is characterized in that: It contains the following components by mass percentage: The composition is as follows: Si 6.5%-9%, Mg 0.3%-0.8%, Mn 0.5%-1.0%, Cu 0.1%-0.3%, Ti 0.05%-0.15%, Sr 0.01%-0.03%, rubber powder 0.5%-1.5%, Fe ≤0.15%, with the remainder being Al and unavoidable impurities. The mass percentage of unavoidable impurities in each element is ≤0.05%, resulting in a total mass percentage of unavoidable impurities ≤0.15%.

2. The easily die-cast, highly fluid, and highly ductile aluminum alloy material according to claim 1, characterized in that: It contains the following components by mass percentage: The composition is as follows: Si 7%-8%, Mg 0.4%-0.6%, Mn 0.75%-0.9%, Cu 0.15%-0.25%, Ti 0.75%-0.1%, Sr 0.02%, rubber powder 1%, Fe ≤ 0.15%, with the remainder being Al and unavoidable impurities. The mass percentage of unavoidable impurities in each element is ≤ 0.05%, resulting in a total mass percentage of unavoidable impurities ≤ 0.15%.

3. The easily die-cast, highly fluid, and highly ductile aluminum alloy material according to claim 2, characterized in that: The rubber powder is an elastomer particle with a size of 10-50 μm, and the elastomer particle is nitrile rubber powder or silicone rubber powder.

4. A method for preparing a highly fluid, easily die-cast, and highly ductile aluminum alloy material as described in any one of claims 1-3, characterized in that: The preparation method includes the following steps: Step 1: Raw material preparation: Weigh Al, Si, Mg, Mn, Cu, Ti, Sr and rubber powder raw materials according to the mass percentage of easily die-cast, highly fluid and highly ductile aluminum alloy materials; The raw materials include: industrial pure aluminum, industrial silicon, magnesium ingots with a purity ≥99.7%, Al-Mn master alloy with Mn content of 10%-20%, Al-Cu master alloy with Cu content of 20%-30%, Al-Ti master alloy with Ti content of 5%-10%, Al-Sr master alloy with Sr content of 5%-10%, and the rubber powder is nitrile rubber powder or silicone rubber powder; the Fe element content in each of the above raw materials is ≤0.05%. Step 2, Smelting: Add industrial pure aluminum to the smelting furnace and heat it to 720-750℃ to melt it. Then add industrial silicon, Al-Mn master alloy and Al-Cu master alloy in sequence and stir until completely melted. Control the smelting temperature to 730-760℃. Step 3, Refining: After the alloy liquid has completely melted, add the refining agent and refine at 730-750℃ for 20-30 minutes; Step 4: Add trace elements: Add the Al-Ti master alloy and Al-Sr master alloy to the refined alloy liquid, stir evenly, keep stirring, continue to add rubber powder, control the temperature at 720-740℃, and let stand for 5-10 minutes. Step 5, Die Casting: Control the temperature of the alloy liquid obtained in Step 4 at 680-720℃, control the mold temperature at 180-220℃, and use a die casting machine to perform die casting. Step 6, Heat Treatment: Perform T6 heat treatment on the die-cast parts to obtain the final product.

5. The method for preparing the easily die-cast, highly fluid, and highly elongated aluminum alloy material according to claim 4, characterized in that: In step two, the added industrial silicon is pre-crushed into particles with a size of 20-50mm.

6. The method for preparing the easily die-cast, highly fluid, and highly elongated aluminum alloy material according to claim 4, characterized in that: In step three, the refining agent is a mixture of hexachloroethane and nitrogen, and the amount of refining agent added is 0.3%-0.5% of the mass of the alloy liquid.

7. The method for preparing the easily die-cast, highly fluid, and highly ductile aluminum alloy material according to claim 6, characterized in that: The refining agent is added as follows: the refining agent is placed in a graphite bell jar and slowly pressed into the bottom of the alloy liquid, while nitrogen gas is introduced at a flow rate of 0.5-1.0 L / min. After refining, the mixture is allowed to stand for 10-15 minutes to allow the inclusions to float to the surface.

8. The method for preparing the easily die-cast, highly fluid, and highly elongated aluminum alloy material according to claim 4, characterized in that: Before adding rubber powder, the surface of the rubber powder particles is modified using a silane coupling agent.

9. The method for preparing the easily die-cast, highly fluid, and highly elongated aluminum alloy material according to claim 8, characterized in that: The silane coupling agent is selected from silane coupling agents containing amino or epoxy groups. The modification treatment method is as follows: rubber powder particles with qualified particle size are added to the silane coupling agent treatment solution, the mass ratio of particles to treatment solution is 1:5, and stirred in a constant temperature water bath at 50℃ for 60 minutes. After filtering out the rubber particles, they are first pre-dried in an oven at 60℃ for 1 hour, and then heated to 110℃ and kept at that temperature for 2 hours, so that the silane coupling agent forms a stable siloxane film on the particle surface.

10. The method for preparing the easily die-cast, highly fluid, and highly elongated aluminum alloy material according to claim 4, characterized in that: In step five, the injection speed during die casting is 3-5 m / s, and the injection pressure is 60-80 MPa; the mold is preheated before die casting, and a release agent is sprayed onto the surface of the mold cavity.

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