CN113088737A - Compound alterant for deeply modifying eutectic silicon and preparation method thereof - Google Patents
Compound alterant for deeply modifying eutectic silicon and preparation method thereof Download PDFInfo
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- CN113088737A CN113088737A CN202110400144.6A CN202110400144A CN113088737A CN 113088737 A CN113088737 A CN 113088737A CN 202110400144 A CN202110400144 A CN 202110400144A CN 113088737 A CN113088737 A CN 113088737A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention discloses a composite modifier for deeply modifying eutectic silicon and a preparation method thereof, relating to the field of aluminum-silicon casting alloy; the alterant comprises, by mass, 5.0-8.0% of Sr, 8.5-15% of RE, less than or equal to 0.30% of impurity elements, and the balance of Al; wherein RE is one or two of La and Ce; and the method comprises a smelting step and a hot extrusion step which are carried out in sequence. The method prepares the composite modifier with low cost and high efficiency, and the modifier can change the growth mode or stacking sequence of the silicon phase by taking Sr as a main modifier to promote the transformation of the silicon phase to particles or fibers, can change the growth direction of the eutectic silicon phase by taking RE as an auxiliary modifier, can inhibit the diffusion and migration of elements such as Sr, Si and the like, and improve the nucleation rate and modification efficiency of the eutectic silicon; meanwhile, the movement of dislocation can be blocked by forming fine rare earth phases, and the alloy strength is improved.
Description
Technical Field
The invention relates to the technical field of cast aluminum alloy, in particular to a composite modifier for deep modification of eutectic silicon and a preparation method thereof.
Background
The cast Al-Si alloy has the advantages of good fluidity, low shrinkage rate and thermal expansion coefficient, good corrosion resistance and recoverability and the like, is suitable for preparing large-size, complex-structure and thin-wall castings, and is widely applied to the fields of automobiles, communication and the like. With the rapid development of new energy automobiles and 5G communication base stations, light weight has become one of the key problems of important attention and commonality in the industry. The Al-Si alloy as the basic raw material also faces the challenge of upgrading the performance.
Common structures of Al-Si cast alloys include alpha-Al phase, eutectic silicon, and small amounts of intermetallic compounds. The Si phase is taken as a hardening phase, and stress concentration is easily generated at the tip and the corner, so that the performance, particularly the plasticity of the alloy is reduced. Coarse alpha-Al dendrites and intermetallic compounds have a certain influence on the strength and plasticity of the alloy, but the influence is less than that of the Si phase. Modification and refinement are effective methods for improving the structure and performance of Al-Si alloy, and in recent years, the strength and toughness of the alloy are improved mainly at home and abroad by synergistically refining the structure. CN201610517976.5 discloses an Al-Si-La-B quaternary master alloy and a preparation method thereof, lanthanum boride in the Al-Si-La-B master alloy can be uniformly divided by eutectic silicon without obvious agglomeration. Can not refine primary aluminum crystal grains efficiently and can not generate toxic effect with the modified element strontium, thereby improving the comprehensive mechanical property and the casting property of the cast aluminum alloy. CN201910018762.7 discloses a composite modifier, which comprises Al-Ti-B intermediate alloy, Al-Sr intermediate alloy and Al-RE intermediate alloy, the addition ratio is 0.01-0.04%, 0.01-0.05% and 0.01-0.1% respectively. The composite modification can achieve the purpose of simultaneously refining alpha-Al crystal grains and modifying eutectic silicon, and can improve the toughness of the cast aluminum alloy.
The lanthanum boride, Al-Ti-B and Al-RE in the two patents mainly have the function of refining alpha-Al, but have no obvious function of further improving the form of eutectic silicon, and limit the improvement of the plasticity of Al-Si alloy cast aluminum alloy.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a composite alterant capable of deeply altering eutectic silicon of eutectic silicon and a preparation method thereof.
The invention is realized by the following steps:
in a first aspect, the invention provides a preparation method of a composite modifier for deeply modifying eutectic silicon, wherein the composite modifier for deeply modifying eutectic silicon comprises, by mass, 5.0-8.0% of Sr, 8.5-15% of RE, less than or equal to 0.30% of impurity elements, and the balance of Al; wherein RE is one or two of La and Ce;
the preparation method of the composite alterant for the deep alteration of the eutectic silicon comprises a smelting step and a hot extrusion step which are sequentially carried out; wherein the smelting step comprises smelting pure aluminum and raw materials containing Sr and RE to obtain long-strip Al4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Casting of the phases; the hot extrusion step comprises the step of carrying out hot extrusion plastic deformation on the cast ingot to obtain the composite modified wire/rod material.
In an optional embodiment, the smelting step specifically comprises the steps of putting pure aluminum into a melting furnace, heating to 750-800 ℃, adding a covering agent accounting for 0.02% of the mass of the melt after the pure aluminum is completely melted, and pressing raw materials containing Sr and RE into the melt.
In an alternative embodiment, the method for preparing the composite alterant for deeply modifying eutectic silicon further comprises the following steps:
continuously heating to 850-900 ℃ before the hot extrusion step, and sampling to test components after the raw materials are completely melted;
introducing argon into the melt, and introducing the argon for a preset time; and standing, slagging off and casting to a semi-continuous casting machine to prepare a cylindrical cast ingot.
In an alternative embodiment, the argon is high purity argon having a purity of 99.99%; the preset time is 5-15 min.
In an alternative embodiment, the hot extrusion step comprises in particular: and (3) placing the cast ingot into a heat treatment furnace, preserving heat, placing the cast ingot into a preheated extrusion barrel, and performing extrusion forming to obtain the composite modified wire/rod material.
In an optional embodiment, the temperature of the heat treatment furnace is 450-520 ℃, and the heat preservation time is 1-5 h.
In an alternative embodiment, the diameter of the composite modified line/rod is 9-15 mm.
In an optional embodiment, in the composite alterant for deeply modifying eutectic silicon, the mass fraction ratio of RE to Sr is 1.7-2.5.
In an alternative embodiment, RE is added as a metallic rare earth or Al-RE master alloy of 99.0% purity or greater; sr is added in the form of metal Sr or Al-Sr with the purity of more than 99.0%.
In a second aspect, the present invention provides a composite modifier for deeply modifying eutectic silicon, which is prepared by the method for preparing a composite modifier for deeply modifying eutectic silicon according to any one of the above embodiments.
Embodiments of the invention have at least the following advantages or benefits:
the embodiment of the invention provides a preparation method of a composite modifier for deeply modifying eutectic silicon, which comprises the following components, by mass, 5.0-8.0% of Sr, 8.5-15% of RE, less than or equal to 0.30% of impurity elements, and the balance of Al; wherein RE is one or two of La and Ce; the preparation method of the composite alterant for the deep alteration of the eutectic silicon comprises a smelting step and a hot extrusion step which are sequentially carried out; wherein the smelting step comprises smelting pure aluminum and raw materials containing Sr and RE to obtain long-strip Al4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Casting of the phases; the hot extrusion step comprises the step of plastically deforming the cast ingot to obtain the composite modified wire/rod material. The method can prepare the Al-Sr-RE composite modifier with low cost and high efficiency by combining a smelting method and hot extrusion, and the growth mode or stacking sequence of a silicon phase can be changed by taking Sr as a main modifier to promote siliconThe phase changes to particles or fibers, the growth direction of the eutectic silicon phase can be changed together by using RE as an auxiliary modifier, the diffusion and the migration of elements such as Sr, Si and the like can be inhibited, the nucleation rate of the eutectic silicon is improved, and Al and Si can form Al along with the increase of the concentration of RE8Si4RE phases are uniformly distributed in the eutectic area to block dislocation motion and atom migration, so that eutectic silicon can be deeply modified, modification inoculation time is shortened, and modification efficiency is improved; in addition, the formed fine rare earth phase can also block the movement of dislocation, and the alloy strength is improved.
The embodiment of the invention also provides a composite inoculant for deep deterioration of eutectic silicon, which is prepared by the method, so that the composite inoculant also has the advantages of short inoculation time and high deterioration efficiency.
Detailed Description
In order to make the objects, 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. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
The embodiment of the invention provides a preparation method of a composite modifier for deeply modifying eutectic silicon, which comprises the following components, by mass, 5.0-8.0% of Sr, 8.5-15% of RE, less than or equal to 0.30% of impurity elements, and the balance of Al; wherein RE is one or two of La and Ce.
In detail, RE is one or two of La and Ce, and is added in the form of metal rare earth with the purity of more than 99.0 percent or Al-RE intermediate alloy; sr is added in the form of metal Sr or Al-Sr with the purity of more than 99.0 percent; al is added in the form of pure aluminum with a purity of more than 99.7 percent. The composite modifier for deeply modifying the eutectic silicon mainly contains two effective elements such as Sr and RE, and the RE selects La and Ce with large reserves and low price, so that the cost is low. The Sr and the RE exist in the form of Al-Sr-RE compounds which are fine and evenly distributed, almost no inoculation time is needed, the burning loss and the oxidation of the Sr are obviously reduced, the efficiency of the alterant is improved, and the timeliness of the alterant is prolonged.
Meanwhile, as an optional scheme, in the embodiment of the invention, in the composite modifier for deeply modifying eutectic silicon, the mass fraction ratio of RE to Sr is 1.7-2.5. The addition amount of RE is controlled by controlling the mass ratio of RE to Sr, so that the addition amount of RE is not more than 0.1% when the RE is used for modifying and casting the aluminum alloy, and the cost can be effectively saved. Meanwhile, the Sr is still the main alterant of eutectic silicon in the Al-Si alloy through the limitation of mass ratio and addition amount, the modification mechanism is that the Sr is gathered at the solid-liquid interface of the Si phase and selectively adsorbed at the twin crystal groove where the Si phase originally grows, the growth mode or stacking sequence of the Si phase is changed, and the conversion of the Si phase to particles or fibers is promoted.
In addition, RE is used as an auxiliary modifier of Sr, on one hand, because the RE content is low and is far away from Al-Ce or Al-La eutectic point components, an Al-RE phase cannot be formed, but is adsorbed at the twin crystal grooves of eutectic silicon together with Sr, and the growth direction of the eutectic silicon phase is changed together; on the other hand, the enrichment is carried out at the front edge of the silicon phase, so that the diffusion and the migration of elements such as Sr and Si are inhibited, the supercooling of the formed components is realized, and the nucleation rate of the eutectic silicon is improved; finally, Al is formed with Al and Si along with the increase of RE concentration8Si4RE phases are uniformly distributed in the eutectic area to block dislocation motion and atom migration, so that eutectic silicon can be deeply modified during modification of cast aluminum alloy, modification inoculation time is shortened, and modification efficiency is improved.
The preparation method of the composite alterant for the deep alteration of the eutectic silicon provided by the embodiment of the invention specifically comprises the steps of smelting and hot extrusion which are sequentially carried out; wherein the smelting step comprises smelting pure aluminum and raw materials containing Sr and RE to obtain long-strip Al4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Casting of the phases; the hot extrusion step comprises the step of plastically deforming the cast ingot to obtain the composite modified wire/rod material.
That is, by the above-mentioned preparation method, on one hand, the manufacturing cost can be reduced, and the manufacturing efficiency can be improved to obtain the performanceAn excellent Al-Sr-RE composite modifier. On the other hand, Sr and RE elements with different modification functions are fused together by a metallurgy method to form long-strip Al4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3And (4) phase(s). In the subsequent extrusion process, the long Al strip4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3The phases are bent, broken and crushed in the process of violent plastic deformation, and the composite modified wire/rod material consisting of the Sr-rich phase and the RE-rich phase with uniform size and fine particles is obtained, so that the modification effect of Sr and RE can be fully utilized, two different compounds are formed by a metallurgical method, the burning loss and oxidation of elements during separate addition are reduced, the two compounds are refined by the large plastic deformation of hot extrusion, the modification inoculation time is reduced, and the modification efficiency is obviously improved; in addition, the movement of dislocation can be blocked by the formed fine rare earth phase, thereby obviously improving the alloy strength.
That is, in the embodiment of the invention, the components and the dosage of the composite alterant are combined with the preparation method to form a complete technical scheme, and the combination of the components and the dosage can obviously improve the alteration efficiency, thereby achieving the purpose of deeply altering eutectic silicon. The flow of the production method will be described in detail below.
In detail, in the embodiment of the invention, the smelting step specifically comprises the steps of putting pure aluminum into a melting furnace, heating to 750-800 ℃, adding a covering agent accounting for 0.02% of the mass of the melt after the pure aluminum is completely melted, and pressing raw materials containing Sr and RE into the melt. The covering agent is used for protecting the melt, air and the melt can be isolated by using the covering agent, the melt and raw materials containing Sr and RE can be effectively melted, the sintering yield of the rare earth elements is improved, and the preparation efficiency and the effect of the composite alterant are ensured. Meanwhile, raw materials containing Sr and RE are pressed into the melt through a Ti bell jar to ensure that the long-strip Al-containing material can be formed4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Casting of the phases. In other embodiments, the raw materials containing Sr and RE may be added by other addition methods, so as to ensure that the melt and the raw materials can be effectively melted.
As an optional scheme, in the embodiment of the invention, the preparation method of the composite alterant for the deep alteration of the eutectic silicon further comprises the steps of continuously heating to 850-900 ℃ before the hot extrusion step, and sampling and testing components after the raw materials are completely melted so as to detect and verify the components of the melt; then, introducing high-purity argon into the melt for 5-15 min; and (4) standing, slagging off and casting to a semi-continuous casting machine to prepare and obtain a corresponding cylindrical cast ingot.
The argon is high-purity argon with the purity of 99.99%, the melt is kept stand for 15-30 min, slag is removed, the melt is cast to a semi-continuous casting machine, a corresponding cylindrical cast ingot is prepared, and the cast ingot to be subjected to heat treatment can be obtained by cooling the cast ingot and turning a skin.
In detail, the hot extrusion step specifically comprises: and (3) putting the cylindrical cast ingot into a heat treatment furnace, preserving heat, putting the cast ingot into a preheated extrusion barrel, and performing extrusion forming to obtain the composite modified wire/rod material. Wherein the temperature of the heat treatment furnace is 450-520 ℃, and the heat preservation time is 1-5 h. The diameter of the composite modified wire/rod is 9-15 mm. At the temperature and the holding time, the long-strip Al in the cast ingot is formed in the extrusion forming process4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3The phase is bent, broken and crushed in the process of violent plastic deformation, and the composite modified line/rod material consisting of the Sr-rich phase and the RE-rich phase with uniform size and fine particles is obtained, so that the composite modified line/rod material can be used as a composite modifier for deeply modifying eutectic silicon.
The above process flow is described in detail below by specific examples.
Example 1
The embodiment provides a composite alterant for deeply modifying eutectic silicon, which comprises 5.0% of Sr, 9.0% of Ce and 86.0% of Al in percentage by mass, and inevitable impurity elements;
the composite alterant is prepared by the following method:
s1: putting industrial pure aluminum into a melting furnace, heating to 750 ℃, adding a covering agent with the mass of 0.02 percent of the melt after the industrial pure aluminum is completely melted, and then pressing Al-10Sr and Al-20Ce into the melt by using a Ti bell jar;
s2: heating to 850 ℃, and sampling to test components after the raw materials are completely melted; then introducing high-purity argon with the purity of 99.99 percent into the melt for 10 min;
s3: standing the melt for 30min, slagging off, and casting to a semi-continuous casting machine to prepare a cylindrical cast ingot with the diameter of 110 mm;
s4: and (3) turning a skin after the ingot casting is cooled, then putting the ingot casting into a heat treatment furnace at 450 ℃, preserving heat for 1h, putting the ingot casting into a preheated extrusion cylinder, and carrying out extrusion forming to obtain a wire rod with the diameter of 9-15 mm.
Example 2
The embodiment provides a composite alterant for deeply modifying eutectic silicon, which comprises 8.0% of Sr, 15% of La and 77.0% of Al in percentage by mass, and inevitable impurity elements;
the composite alterant is prepared by the following method:
s1: putting industrial pure aluminum into a melting furnace, heating to 800 ℃, adding a covering agent with the mass of 0.02% of the melt after the aluminum is completely melted, and then pressing metal Sr and metal La into the melt by using a Ti bell jar;
s2: heating to 900 deg.C, and sampling to test components after the raw materials are completely melted; then introducing high-purity argon with the purity of 99.99 percent into the melt for 10 min;
s3: standing the melt for 15min, slagging off, casting to a semi-continuous casting machine, and preparing a cylindrical cast ingot with the diameter of 210 mm;
s4: and (3) turning a skin after the cast ingot is cooled, then putting the cast ingot into a heat treatment furnace at 520 ℃, preserving heat for 3 hours, putting the cast ingot into a preheated extrusion cylinder, and performing extrusion forming to obtain a rod material with the diameter of 15 mm.
Example 3
The embodiment provides a composite alterant for deeply modifying eutectic silicon, which comprises 6.5% of Sr, 6.0% of Ce, 6.0% of La and 86.0% of Al in percentage by mass, and inevitable impurity elements;
the composite alterant is prepared by the following method:
s1, putting the industrial pure aluminum into a melting furnace, heating to 750 ℃, adding a covering agent accounting for 0.02 percent of the mass of the melt after the industrial pure aluminum is completely melted, and then pressing the Sr, the Al-20Ce and the Al-15La into the melt by using a Ti bell jar;
s2, heating to 880 ℃, and sampling to test components after the raw materials are completely melted; then introducing high-purity argon with the purity of 99.99 percent into the melt for 15 min;
s3: standing the melt for 20min, slagging off, casting to a semi-continuous casting machine, and preparing a cylindrical cast ingot with the diameter of 330 mm;
s4: and (3) turning a skin after the ingot casting is cooled, then putting the ingot casting into a heat treatment furnace at 500 ℃, preserving heat for 5 hours, putting the ingot casting into a preheated extrusion cylinder, and performing extrusion forming to obtain a rod material with the diameter of 12 mm.
Example 4
The embodiment provides a composite alterant for deeply modifying eutectic silicon, which comprises 6.0% of Sr, 8% of Ce, 2% of La and 84.0% of Al in percentage by mass, and inevitable impurity elements;
the composite alterant is prepared by the following method:
s1: putting industrial pure aluminum into a melting furnace, heating to 770 ℃, adding a covering agent accounting for 0.02 percent of the mass of a melt after the industrial pure aluminum is completely melted, and then pressing Al-10Sr, metal Ce and Al-20La into the melt by using a Ti bell jar;
s2: heating to 875 ℃, and sampling to test components after the raw materials are completely melted; then introducing high-purity argon with the purity of 99.99 percent into the melt for 15 min;
s3: standing the melt for 25min, slagging off, casting to a semi-continuous casting machine, and preparing a cylindrical cast ingot with the diameter of 110 mm;
s4: and (3) turning a skin after the cast ingot is cooled, then putting the cast ingot into a 490-DEG C heat treatment furnace, preserving heat for 2 hours, putting the cast ingot into a preheated extrusion cylinder, and performing extrusion forming to obtain a rod material with the diameter of 13 mm.
Examples of the experiments
The composite modified wires/rods prepared in examples 1 to 4 were tested for long Al4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Equivalence of phasesParticle size, test results are given in the following table:
TABLE 1 equivalent particle size
According to the data in table 1, the composite alterant for deeply modifying eutectic silicon provided by the embodiment of the invention can be bent, broken and crushed in the process of severe plastic deformation by matching with the preparation method, so that the composite modified wire/rod material consisting of the Sr-rich phase and the RE-rich phase with uniform size and fine particles is obtained, that is, the embodiment of the invention can fully utilize the modification effect of Sr and RE to form two different compounds by a metallurgical method, thereby reducing the burning loss and oxidation of elements when being added independently, and simultaneously, the two compounds are refined by utilizing the large plastic deformation of hot extrusion, thereby reducing the inoculation time of modification and obviously improving the modification efficiency.
In summary, embodiments of the present invention provide a composite modifier for deeply modifying eutectic silicon, which can deeply modify eutectic silicon, and a preparation method thereof, which can effectively reduce the incubation time for modification and significantly improve the modification efficiency.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a composite alterant for deeply modifying eutectic silicon is characterized by comprising the following steps:
the composite modifier for deeply modifying the eutectic silicon comprises, by mass, 5.0-8.0% of Sr5, 8.5-15% of RE, less than or equal to 0.30% of impurity elements, and the balance of Al; wherein RE is one or two of La and Ce;
the preparation method of the composite alterant for the deep alteration of the eutectic silicon comprises a smelting step and a hot extrusion step which are sequentially carried out;wherein the smelting step comprises smelting pure aluminum and raw materials containing Sr and RE to obtain Al containing long strips4(Sr, RE) phase and Kanji-shaped Al11(RE,Sr)3Casting of the phases; and the hot extrusion step comprises the step of carrying out hot extrusion plastic deformation on the cast ingot to obtain the composite modified wire/rod material.
2. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 1, wherein:
the smelting step specifically comprises the steps of putting pure aluminum into a melting furnace, heating to 750-800 ℃, adding a covering agent accounting for 0.02% of the mass of the melt after the pure aluminum is completely molten, and pressing the Sr and RE-containing raw materials into the melt.
3. The method for preparing a composite alterant with deeply altered eutectic silicon according to claim 1, wherein the method for preparing the composite alterant with deeply altered eutectic silicon further comprises:
continuously heating to 850-900 ℃ before the hot extrusion step, and sampling to test components after the raw materials are completely melted;
introducing argon into the melt, and introducing the argon for a preset time; and standing, slagging off and casting to a semi-continuous casting machine to prepare the cylindrical cast ingot.
4. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 3, wherein:
the argon gas is high-purity argon gas with the purity of 99.99 percent; the preset time is 5-15 min.
5. The method for preparing a composite inoculant for the deep deterioration of eutectic silicon according to claim 3, wherein the hot extrusion step specifically comprises:
and (3) placing the cast ingot into a heat treatment furnace, preserving heat, placing the cast ingot into a preheated extrusion barrel, and performing extrusion forming to obtain the composite modified wire/rod material.
6. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 5, wherein:
the temperature of the heat treatment furnace is 450-520 ℃, and the heat preservation time is 1-5 h.
7. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 5, wherein:
the diameter of the composite modified wire/rod is 9-15 mm.
8. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 5, wherein:
in the composite alterant for the deep alteration of the eutectic silicon, the mass fraction ratio of RE to Sr is 1.7-2.5.
9. The method for preparing a composite inoculant for deep eutectic silicon deterioration, according to claim 5, wherein:
the RE is added in the mode of metal rare earth with the purity of more than 99.0 percent or Al-RE intermediate alloy; the Sr is added in the form of metal Sr or Al-Sr with the purity of more than 99.0 percent.
10. A composite modifier for deep eutectic silicon modification, which is prepared by the method for preparing a composite modifier for deep eutectic silicon modification according to any one of claims 1 to 9.
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