Eutectic die-casting aluminum alloy material, preparation method and application thereof

Abstract

This invention discloses a eutectic die-cast aluminum alloy material, its preparation method, and its application. The chemical composition of this aluminum alloy material is: Si 10.5%–13.0%, Fe 0.75%–0.9%, Sr 0.005%–0.02%, RE 0.01%–0.05%, B 0.002%–0.02%, with the balance being Al and other unavoidable impurity elements totaling no more than 0.3%, and each individual impurity element not exceeding 0.05%. The preparation method involves: melting raw materials of Al, Si, and Fe, sampling and testing the composition, and adjusting their content; adding a refining agent for refining, then adding raw materials containing B to borate V, Ti, and Cr; converting the upper melt to a converter, adding a refining agent for secondary refining, and then performing Al-Sr-RE composite modification treatment; finally, casting the ingot. Through composition design, removal of transition elements, and deep composite modification of the second phase, the thermal conductivity of the casting is improved.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, and more specifically, to a eutectic die-cast aluminum alloy material, its preparation method, and its application. Background Technology

[0002] Aluminum alloys are characterized by their low density, light weight, good machinability, and excellent thermal and electrical conductivity, making them widely used in various sectors of the national economy and the second most consumed metallic material globally. Among them, Al-Si cast aluminum alloys have the best castability, enabling the fabrication of large, thin-walled, and complex castings. They are commonly used for heat dissipation components in large equipment, such as automobiles, communication base stations, and electronic products.

[0003] The commonly used alloy grade ADC12 aluminum alloy has good casting properties and strength, but its thermal conductivity is less than 100 W / m·K. In recent years, low-Mg Al-Si-Fe alloys have been developed in China. Combined with eutectic silicon modification technology, the thermal conductivity of the alloy has been significantly improved. CN 109554589 B discloses a high thermal conductivity rare earth aluminum alloy, its preparation method and its application. The alloy contains: Si 8.0-10.0%, Fe 0.6-1.2%, Sr 0.005-0.05% and Er 0.01-0.15%, with the balance being Al and unavoidable impurity elements. By composite addition of Al-Sr and Al-Er as modifiers and strict control of the content of impurity elements such as Mn, Cr, Ti, and V, heat dissipation components with tensile strength ≥270 MPa, yield strength ≥120 MPa, and thermal conductivity ≥160 W / (m·K) were obtained. CN 110951979A discloses a high-strength, high-thermal-conductivity die-cast aluminum alloy material and its preparation method. The alloy comprises: Si 9–13%; Fe 0.4–0.9%; Cu 0.1–0.5%; Mg 0.1–0.5%; Sr 0.01–0.05%; Zn ≤0.01%; Pb ≤0.1%; Cd ≤0.01%; nanomaterials 0.1–3%; and total impurities not exceeding 0.2%. By utilizing the strengthening effects of Mg and Cu, and the refining effects of Sr and nano-titanium-carbon-boron alloys, the strength and thermal conductivity of the alloy are improved, achieving a thermal conductivity of over 174 W / (m·K). CN 115558825 B discloses a high thermal conductivity, high strength and toughness die-cast aluminum alloy containing: Si 11%; Fe 0.8%; Zn 0.75%; Mg 0.3%; Sr 0.03%; B 0.02%; Cu≤0.1%; and other impurities ≤0.1%. After melting, casting and secondary artificial aging treatment, the thermal conductivity of the alloy can reach over 185 W / (m·K).

[0004] The Si content of the aforementioned patents is close to the Al-Si eutectic point, and all exhibit good casting properties. However, CN109554589 B has thermal conductivity similar to that of A356 alloy (Al-7Si-0.35Mg), and contains rare and precious elements such as Er, resulting in lower thermal conductivity and higher cost. CN 110951979A contains a certain amount of Mg and Cu, which are easily dissolved in the matrix, hindering the improvement of the alloy's thermal conductivity. Furthermore, it requires the addition of nanomaterials as refining agents, leading to higher costs. CN 115558825 B alloy has excellent thermal conductivity, but the content of its main components is strictly limited, and it contains a high amount of Mg and undergoes two heat treatments, making it technically challenging and complex to manufacture.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a eutectic die-cast aluminum alloy material, its preparation method, and its application, so as to improve the above-mentioned technical problems.

[0007] This invention is implemented as follows:

[0008] In a first aspect, the present invention provides a eutectic die-cast aluminum alloy material, the chemical composition of which, by mass percentage, is: Si 10.5%–13.0%, Fe 0.75%–0.9%, Sr 0.005%–0.02%, RE 0.01%–0.05%, B 0.002%–0.02%, with the balance being Al and other unavoidable impurity elements, the total amount of other impurity elements not exceeding 0.3%, and the amount of any single element not exceeding 0.05%.

[0009] Secondly, the present invention also provides a method for preparing the above-mentioned eutectic die-cast aluminum alloy material, comprising: melting raw materials corresponding to the three elements Al, Si, and Fe to obtain an aluminum melt; sampling and testing the composition of the aluminum melt, and adjusting the content of Si and Fe according to the measured composition of Si and Fe; adding a refining agent to the aluminum melt after adjusting the content for a first refining, and then adding a raw material containing B for static heat preservation treatment, wherein the mass ratio of B in the raw material containing B to the total mass of V, Ti, and Cr in the aluminum melt is 0.25 to 1:1, reducing the individual content of V, Ti, and Cr to below 0.002%; after the upper melt after static heat preservation treatment is converted to a furnace, a refining agent is added for a second refining, and then a raw material containing Sr and RE is added for modification treatment; and the modified melt is cast into an ingot.

[0010] Thirdly, the present invention also provides the application of the above-mentioned eutectic die-cast aluminum alloy material in the manufacture of heat dissipation components for automobiles, communication base stations or electronic products.

[0011] This invention offers the following advantages: by optimizing the composition, it improves the alloy's casting performance, mechanical properties, and mold adhesion. Simultaneously, by strictly controlling the added boron content during preparation, it achieves the dual benefits of removing impurity elements V, Ti, and Cr through boriding treatment and the formation of MB2 compounds through gravity settling and converter separation. Furthermore, it ensures that residual boron does not adversely affect the modification of Sr, thereby improving the thermal conductivity of the aluminum alloy material and its castings. This aluminum alloy material is suitable for producing large, thin-walled, and complex thermally conductive components. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0013] The following is a detailed description of a eutectic die-cast aluminum alloy material, its preparation method, and its application provided by the present invention.

[0014] Some embodiments of the present invention provide a eutectic die-cast aluminum alloy material, the chemical composition of which, by mass percentage, is: Si 10.5%–13.0%, Fe 0.75%–0.9%, Sr 0.005%–0.02%, RE 0.01%–0.05%, B 0.002%–0.02%, with the balance being Al and other unavoidable impurity elements, the total amount of other impurity elements not exceeding 0.3%, and the amount of any single element not exceeding 0.05%.

[0015] By optimizing the composition, the casting performance, mechanical properties, and sticking properties of the alloy are improved. Si and Fe are the main alloying elements. Si is primarily used to improve the alloy's fluidity and casting performance, which is beneficial for manufacturing large die-casting machines with thin walls and complex structures. Simultaneously, silicon acts as a second phase, hindering dislocation movement and increasing the alloy's strength. Fe is mainly used to improve the alloy's sticking properties. Furthermore, Fe has extremely low solid-state solubility in Al, having little impact on the alloy's thermal conductivity. In addition, the content of other elements is strictly limited, including Mg, Mn, Ti, Cr, and V, which have a significant impact on thermal conductivity. Sr and RE are used as modifying elements, utilizing their high reactivity to adsorb onto the surface of nucleation particles and growth steps, lowering the nucleation temperature of eutectic silicon and iron-rich phases, increasing their nucleation efficiency, and promoting the transformation of the second phase into fine, short-plate-like and granular structures. According to the Orovan dislocation bypass mechanism, the refinement of the second phase can significantly improve the alloy's strength, while also improving its plasticity and thermal conductivity. In addition, strict control over the content of Sr and RE not only prevents the reaction between Sr and B, but also lowers the formation temperature of rare earth phases and Al-Si-Sr phases.

[0016] Specifically, RE includes at least one of La and Ce, and when RE is a combination of La and Ce, the ratio of the two is not limited.

[0017] In some embodiments, the thermal conductivity of the eutectic die-cast aluminum alloy material is greater than 180 W / (m·K).

[0018] Some embodiments of the present invention also provide a method for preparing the above-mentioned eutectic die-cast aluminum alloy material, comprising:

[0019] S1. Adding materials and smelting.

[0020] Specifically, raw materials containing the corresponding elements Al, Si, and Fe are smelted to obtain molten aluminum. This involves adding the prepared raw materials containing Al, Si, and Fe to a smelting furnace, sprinkling a covering agent on the surface of the charge, and then heating and melting them.

[0021] For reference, the raw material corresponding to Al is industrial pure aluminum; the raw material corresponding to Si is quick-dissolving silicon or Al-Si master alloy; and the raw material corresponding to Fe is iron or Al-Fe master alloy.

[0022] S2. Adjust the alloy composition.

[0023] Specifically, the aluminum melt is sampled and its composition is tested. Based on the measured composition of Si and Fe, the content of Si and Fe is adjusted to obtain the aluminum melt with adjusted content.

[0024] S3, refining and boronizing treatment.

[0025] Specifically, a refining agent is added to the molten aluminum for the first refining, followed by the addition of a raw material containing B and a static heat treatment. The ratio of the mass of B in the raw material to the total mass of V, Ti, and Cr in the molten aluminum is 0.25 to 1:1. For example, the mass of B is 0.25 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, or 1 times the total mass of V, Ti, and Cr in the molten aluminum.

[0026] Industrial pure aluminum contains certain impurity elements, including transition elements such as Ti, V, and Cr. The mass fraction of V can be as high as 0.03–0.05% or more, which is detrimental to the thermal conductivity of aluminum alloys. However, V, Ti, and Cr can be removed through boronizing treatment. Specifically, boron reacts with V, Ti, and Cr to form TiB₂, VB₂, and CrB. Static holding at a certain temperature allows B to react fully with V, Ti, and Cr, and then settles under gravity. In some embodiments, the static holding temperature is 660℃–760℃, and the holding time is 30–60 minutes.

[0027] In some implementations, the raw materials containing B include, but are not limited to, Al-B master alloys.

[0028] It should be noted that the quality of B needs to be strictly controlled. If the B content is too low, from the perspective of reaction kinetics, B will not be able to react with Ti, V and Cr (the contents of Ti, V and Cr are originally very small). If the B content is too high, the residual amount of B will be too high, which will have a toxic effect on Sr deterioration.

[0029] Furthermore, in some embodiments, the temperature of the first refining is 720–750°C, and the refining time is 5–30 minutes. The addition ratio of the refining agent is 0.15 wt.%–0.2 wt.%. The refining agent is a commercially available aluminum alloy refining agent.

[0030] S4, secondary refining and deterioration treatment.

[0031] Specifically, after the upper melt is heated and kept still, it is then converted to a furnace, and a refining agent is added for a second refining process. Then, raw materials containing Sr and RE are added for a modification process.

[0032] By transferring the melt, the upper melt and the bottom melt are separated, thus avoiding the problem of increased boron content caused by melt stirring.

[0033] In some embodiments, the proportion of refining agent added in the second refining is 0.15 wt.% to 0.2 wt.%, the second refining time is 5 to 30 minutes, and the temperature of the second refining is 720 to 750°C.

[0034] In some embodiments, the raw material containing Sr and RE is an Al-Sr-RE master alloy. The composite modifier mainly contains two effective elements, Sr and RE. Utilizing their high reactivity, they adsorb onto the nucleation sites and growth step surfaces, lowering the nucleation temperature of eutectic silicon and iron-rich phases, increasing their nucleation efficiency, and promoting the transformation of the second phase into fine, short-plate-like and granular structures. According to the Orovan dislocation bypass mechanism, the refinement of the second phase can significantly improve the alloy's strength, while also improving its plasticity and thermal conductivity. To ensure the composite modification effect of Sr and RE, on the one hand, it is added in the form of Al-Sr-RE, ensuring the mutual doping characteristics of Sr and rare earth elements, improving the stability of Sr, and reducing its hydrogen absorption tendency; on the other hand, the content of Sr and RE is strictly controlled, not only avoiding the reaction between Sr and B, but also lowering the formation temperature of the rare earth phase and the Al-Si-Sr-containing phase.

[0035] S5, Ingot casting.

[0036] Specifically, the modified melt is cast into ingots. After the modified melt is allowed to stand for 25 to 40 minutes, the slag is removed, and then a layer of covering agent is sprinkled on the surface of the aluminum melt. The aluminum melt is then introduced into a flow channel, passes through a degassing box and a filter in sequence, and is then introduced into a holding furnace for direct supply to die-casting equipment or a casting machine for gravity casting into ingots.

[0037] It should be noted that the covering agents in steps S1 and S5 are commonly used covering agents in the preparation of aluminum alloys.

[0038] Furthermore, some embodiments of the present invention also provide the application of the above-mentioned eutectic die-cast aluminum alloy material in the manufacture of heat dissipation components for automobiles, communication base stations, or electronic products.

[0039] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0040] Example 1

[0041] This embodiment provides a eutectic die-cast aluminum alloy material, the main alloy composition of which is: Si 11.0%, Fe 0.80%, Sr 0.02%, B 0.006%, Ce 0.03%.

[0042] The specific preparation process of this eutectic die-cast aluminum alloy material is as follows:

[0043] Step 1: Charging and Smelting. Add the prepared industrial pure aluminum, quick-dissolving silicon, and Fe agent to the smelting furnace, and sprinkle a covering agent on the surface of the furnace charge.

[0044] Step 2: Alloy composition adjustment. After the raw materials have completely melted, stir the melt, take samples to test the composition, paying special attention to alloying elements such as Si and Fe, and transition elements such as Ti, Cr, and V; adjust the content of Fe and Si to the designed composition range based on the measured composition of Fe and Si.

[0045] Step 3: Refining and boronizing treatment. Using an inert gas carrier, 0.15 wt.% of a refining agent is introduced and refined at 730℃ for 15 min. Then, according to the content of V, Ti and Cr, 0.5 wt.% of Al-3B master alloy is added, with the mass ratio of B to (V+Ti+Cr) being 0.5, and the mixture is left to stand at this temperature for 30 min.

[0046] Step 4: Second refining and modification treatment. The melt is transferred to a holding furnace and then refined a second time, using the same process as the first refining. An Al-Sr-Ce master alloy is then added, and the melt is stirred to accelerate the melting of the composite modifier.

[0047] Step 5: Casting. After the melt has stood for 30 minutes, the slag is removed, and then a layer of covering agent is sprinkled on the surface of the aluminum melt. The aluminum melt is then introduced into a flow channel, and after passing through a degassing box and a ceramic filter plate / box, it is introduced into a holding furnace and directly supplied to the die-casting equipment or casting machine for gravity casting into ingots.

[0048] Example 2

[0049] This embodiment provides a eutectic die-cast aluminum alloy material, the main alloy composition of which is: Si 10.5.0%, Fe 0.75%, Sr 0.005%, La 0.05%, B 0.012%.

[0050] The specific preparation process of this eutectic die-cast aluminum alloy material is as follows:

[0051] Step 1: Charging and Smelting. The prepared industrial pure aluminum, Al-Si master alloy, and Al-Fe master alloy are added to the smelting furnace, and a covering agent is sprinkled on the surface of the furnace charge.

[0052] Step 2: Alloy composition adjustment. After the raw materials have completely melted, stir the melt, take samples to test the composition, paying special attention to alloying elements such as Si and Fe, and transition elements such as Ti, Cr, and V; adjust the content of Fe and Si to the designed composition based on the measured composition.

[0053] Step 3: Refining and boronizing treatment. Using an inert gas carrier, 0.2 wt.% of refining agent is introduced and refined at 750℃ for 30 min. Then, according to the content of V, Ti, and Cr, 0.2% of Al-10B master alloy is added, with the mass ratio of B to (Ti+V+Cr) being 0.35, and the mixture is allowed to stand for 50 min.

[0054] Step 4: Second refining and modification treatment. The melt is transferred to a holding furnace and then refined a second time, using the same process as the first refining. An Al-Sr-La master alloy is then added, and the melt is stirred to accelerate the melting of the composite modifier.

[0055] Step 5: Casting. After the melt has stood for 25 minutes, the slag is removed, and then a layer of covering agent is sprinkled on the surface of the aluminum melt. The aluminum melt is then introduced into a flow channel, and after passing through a degassing box and a ceramic filter plate / box, it is introduced into a holding furnace and directly supplied to the die-casting equipment or casting machine for gravity casting into ingots.

[0056] Example 3

[0057] This embodiment provides a eutectic die-cast aluminum alloy material with the following main alloy composition: Si 10.5%, Fe 0.75%, Sr 0.005%, Ce 0.04%, La 0.01%, and B 0.018%.

[0058] The specific preparation process of this eutectic die-cast aluminum alloy material is as follows:

[0059] Step 1: Charging and Smelting. The prepared industrial pure aluminum, quick-melting silicon, and Al-Fe master alloy are added to the smelting furnace, and a covering agent is sprinkled on the surface of the furnace charge.

[0060] Step 2: Alloy composition adjustment. After the raw materials have completely melted, stir the melt, take samples to test the composition, paying special attention to alloying elements such as Si and Fe, and transition elements such as Ti, Cr, and V; adjust the content of Fe and Si to the designed composition based on the measured composition.

[0061] Step 3: Refining and boronizing treatment. Using an inert gas carrier, 0.16 wt.% of refining agent is introduced and refined at 730℃ for 5 min. Then, according to the content of V, Ti, and Cr, 0.5% of Al-5B master alloy is added, with the mass ratio of B to (Ti+V+Cr) being 0.25, and the mixture is allowed to stand for 60 min.

[0062] Step 4: Second refining and modification treatment. The melt is transferred to a holding furnace and then refined a second time, using the same process as the first refining. An Al-Sr-Ce-La master alloy is then added, and the melt is stirred to accelerate the melting of the composite modifier.

[0063] Step 5: Casting. After the melt has stood for 40 minutes, the slag is removed, and then a layer of covering agent is sprinkled on the surface of the aluminum melt. The aluminum melt is then introduced into a flow channel, and after passing through a degassing box and a ceramic filter plate / box, it is introduced into a holding furnace and directly supplied to the die-casting equipment or casting machine for gravity casting into ingots.

[0064] Example 4

[0065] This embodiment provides a eutectic die-cast aluminum alloy material, the main alloy composition of which is: Si 12.3%, Fe 0.9%, Sr 0.01%, Ce 0.01%, La 0.25%, and B 0.01%.

[0066] The specific preparation process of this eutectic die-cast aluminum alloy material is as follows:

[0067] Step 1: Charging and Smelting. Add the prepared industrial pure aluminum, Al-Si master alloy, and Fe agent to the smelting furnace, and sprinkle a covering agent on the surface of the furnace charge.

[0068] Step 2: Alloy composition adjustment. After the raw materials have completely melted, stir the melt, take samples to test the composition, paying special attention to alloying elements such as Si and Fe, and transition elements such as Ti, Cr, and V; adjust the content of Fe and Si to the designed composition based on the measured composition.

[0069] Step 3: Refining and boronizing treatment. Using an inert gas carrier, 0.18 wt.% of refining agent is introduced and refined at 740℃ for 10 min. Then, according to the content of V, Ti, and Cr, 0.2% of Al-8B master alloy is added, with the mass ratio of B to (Ti+V+Cr) being 1, and the mixture is allowed to stand for 30 min.

[0070] Step 4: Second refining and modification treatment. The melt is transferred to a holding furnace and then refined a second time, using the same process as the first refining. Al-Sr-RE master alloy is then added, and the melt is stirred to accelerate the melting of the composite modifier.

[0071] Step 5: Casting. After the melt has stood for 35 minutes, the slag is removed, and then a layer of covering agent is sprinkled on the surface of the aluminum melt. The aluminum melt is then introduced into a flow channel, and after passing through a degassing box and a ceramic filter plate / box, it is introduced into a holding furnace and directly supplied to the die-casting equipment or casting machine for gravity casting into ingots.

[0072] Comparative Example 1

[0073] Compared to Example 1, in Comparative Example 1, an equal amount of Al-Sr was used to replace Al-Sr-RE.

[0074] Comparative Example 2

[0075] Compared to Example 2, Comparative Example 2 did not involve the addition of Al-B for boration treatment.

[0076] Comparative Example 3

[0077] Compared with Example 3, the boronizing treatment in Comparative Example 3 was not subjected to low-temperature heat preservation.

[0078] Comparative Example 4

[0079] Compared to Example 4, no liquid transfer treatment was performed in Comparative Example 4.

[0080] Comparative Example 5

[0081] Compared to Example 1, in Comparative Example 1, Al-Sr-Ce was replaced with equal amounts of Al-Sr and Al-Ce.

[0082] Comparative Example 6

[0083] Compared with Example 2, Comparative Example 2 was borated by adding 0.06% B.

[0084] Samples were taken from the ingots of the examples and comparative examples, and the measured thermal conductivity is shown in Table 1.

[0085] Table 1 Thermal conductivity of ingots

[0086]

[0087]

[0088] As can be seen from the data in Table 1, composite modification, boronizing treatment, boronizing insulation, and liquid transfer treatment all significantly improve the thermal conductivity of the ingot. Combined with the optimized design of the alloy composition, eutectic high thermal conductivity aluminum alloy materials can be prepared, which is beneficial for the preparation of large, thin-walled, and complex heat dissipation components.

[0089] In summary, the embodiments of this invention are based on eutectic Al-Si alloys, and improve the thermal conductivity of castings through composition design, removal of transition elements, and deep modification of the second phase. This alloy is suitable for producing large, thin-walled, and complex thermally conductive components.

[0090] 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 eutectic die casting aluminum alloy material, characterized by, The chemical composition, by mass percentage, is as follows: Si 10.5%~13.0%, Fe 0.75%~0.9%, Sr 0.005%~0.02%, RE 0.01%~0.05%, B 0.002%~0.02%, with the balance being Al and other unavoidable impurity elements, the total amount of which does not exceed 0.3%, and the amount of each individual element does not exceed 0.05%; RE includes at least one of La and Ce, and Sr and RE are added in the form of Al-Sr-RE; Its preparation method includes the following steps: Smelting raw materials containing the three elements Al, Si, and Fe yields molten aluminum. The aluminum melt was sampled and its composition was tested. Based on the measured composition of Si and Fe, the content of Si and Fe was adjusted. A refining agent is added to the aluminum melt after the content is adjusted for the first refining, and then a raw material containing B is added for static heat preservation treatment. The ratio of the mass of B in the raw material containing B to the total mass of V, Ti and Cr in the aluminum melt is 0.25~1:

1. After the upper melt is heated and kept still, it is then refining agent is added for a second refining process, followed by the addition of raw materials containing Sr and RE for a modification process. Casting the modified melt into ingots; The temperature for the static heat preservation treatment is 660℃~760℃, and the time for the static heat preservation treatment is 30~60min; The thermal conductivity of the prepared eutectic die-cast aluminum alloy material is greater than 180 W / (m·K).

2. The eutectic die casting aluminum alloy material according to claim 1, characterized by, The corresponding Al raw material is industrial pure aluminum; And / or, the raw material corresponding to Si is fast-dissolving silicon or Al-Si master alloy; And / or, the raw material corresponding to Fe is an iron agent or an Al-Fe master alloy; And / or, the B-containing raw material is an Al-B master alloy.

3. The eutectic die casting aluminum alloy material according to claim 1, characterized by, The raw materials for smelting Al, Si, and Fe include: adding prepared industrial pure aluminum, quick-dissolving silicon or Al-Si master alloy, iron or Al-Fe master alloy into the smelting furnace, sprinkling a covering agent on the surface of the furnace charge, and heating to melt.

4. The eutectic die casting aluminum alloy material of claim 1, wherein, The proportion of refining agent added in the first and second refining processes is 0.15wt.%~0.2wt.%, and the refining time for both processes is 5-30 minutes.

5. The eutectic die-cast aluminum alloy material according to claim 1, characterized in that, Casting the modified melt into ingots includes: letting the modified melt stand for 25 to 40 minutes, then removing the slag, and then sprinkling a layer of covering agent on the surface of the aluminum melt; introducing the aluminum melt into a flow channel, passing through a degassing box and a filter in sequence, and then introducing it into a holding furnace for direct supply to die casting equipment or a casting machine for gravity casting into ingots.

6. The application of the eutectic die-cast aluminum alloy material as described in any one of claims 1 to 5 in the manufacture of heat dissipation components for automobiles, communication base stations, or electronic products.

Images