CN119287224A - A kind of casting aluminum alloy modifier and preparation process - Google Patents
A kind of casting aluminum alloy modifier and preparation process Download PDFInfo
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- CN119287224A CN119287224A CN202411392254.2A CN202411392254A CN119287224A CN 119287224 A CN119287224 A CN 119287224A CN 202411392254 A CN202411392254 A CN 202411392254A CN 119287224 A CN119287224 A CN 119287224A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 85
- 239000003607 modifier Substances 0.000 title claims abstract description 50
- 238000005266 casting Methods 0.000 title claims description 31
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 229910020785 La—Ce Inorganic materials 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 10
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000012795 verification Methods 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims description 76
- 229910045601 alloy Inorganic materials 0.000 claims description 73
- 229910052782 aluminium Inorganic materials 0.000 claims description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 28
- 238000007664 blowing Methods 0.000 claims description 10
- 238000004512 die casting Methods 0.000 claims description 9
- 238000011056 performance test Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910001122 Mischmetal Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
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- 230000003749 cleanliness Effects 0.000 claims description 2
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- 238000010926 purge Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 abstract description 16
- 238000012986 modification Methods 0.000 abstract description 16
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- 235000013619 trace mineral Nutrition 0.000 abstract description 3
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- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 8
- 230000005496 eutectics Effects 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 229910000676 Si alloy Inorganic materials 0.000 description 5
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- 229910000521 B alloy Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
本发明提供了一种铸造铝合金变质剂及其制备工艺，其材料组分包括Sb、Ti、B、V、La‑Ce混合稀土以及微量元素Be和Hf；其制备工艺包括熔炼、精炼、连轧、试验验证步骤。本发明提供的铸造铝合金用变质剂原料与制备工艺，避免了Na、P、Sr元素加入铝合金变质剂产生的铝合金质量问题，有效改善了铸造铝合金组织与性能的变质效果，提高铸造铝合金的室温力学性能，有助于减少生产成本、提高生产效率与产品质量、实现批量生产与高度自动化。
The present invention provides a cast aluminum alloy modifier and a preparation process thereof, wherein the material components include Sb, Ti, B, V, La-Ce mixed rare earth and trace elements Be and Hf; and the preparation process thereof includes smelting, refining, continuous rolling, and test verification steps. The raw material and preparation process of the modifier for cast aluminum alloy provided by the present invention avoid the aluminum alloy quality problems caused by adding Na, P, and Sr elements to the aluminum alloy modifier, effectively improve the modification effect of the structure and performance of the cast aluminum alloy, improve the room temperature mechanical properties of the cast aluminum alloy, and help reduce production costs, improve production efficiency and product quality, and realize mass production and high automation.
Description
Technical Field
The invention relates to the technical field of cast aluminum alloy, in particular to a cast aluminum alloy modifier and a preparation process thereof.
Background
The cast aluminum alloy has excellent casting performance, is the most used aluminum alloy material in automobiles, wherein the aluminum-silicon alloy is most widely applied and accounts for 80% -90% of the total use amount of the cast aluminum alloy. Almost all aluminum alloy castings undergo one or more melting and solidification processes during their manufacture, with the quality of the alloy melt having a significant impact on subsequent processing and final product organization and performance.
The eutectic quantity of the aluminum-silicon alloy can be increased along with the increase of the addition quantity of the silicon element, the eutectic silicon structure is in a thick lath shape or a needle shape under the condition of not deteriorating, and when the silicon element content exceeds the eutectic component, primary crystal silicon is formed, and the aluminum-silicon alloy is in a thick polygonal block shape, so that the mechanical property of the alloy is influenced, the brittleness of the alloy is increased, the plasticity and the cutting property of the alloy are reduced, and the application of the aluminum-silicon alloy is further influenced.
In order to solve the above problems, a silicon-aluminum alloy is generally subjected to a modification treatment in actual production. It is found that Na, K, re, ba, sr, P, bi and other elements have an effect of modifying eutectic silicon, and are added into aluminum alloy melt in the form of pure metal, intermediate alloy and flux, and the conventional various modificators are usually composed of simple substances, composite intermediate alloy or compound containing the elements. Wherein, the modifier of P, na and Sr elements is most common, P has obvious modification effect on primary crystal silicon, and Na and Sr have obvious modification effect on eutectic silicon. However, when the silicon aluminum alloy is subjected to modification treatment, a large amount of P is introduced to reduce the performance of the aluminum alloy, particularly the plasticity and toughness of the alloy, the Na has active chemical properties, is extremely easy to oxidize and burn in the modification treatment, has short modification time and is easy to cause corrosion and damage of a crucible, sr can cause the silicon aluminum alloy melt to be extremely easy to absorb hydrogen, and air holes are generated when the degassing is incomplete, so that the compactness of the product is influenced, and the performance of the aluminum alloy is reduced.
Therefore, in order to produce high-quality aluminum alloy castings with high performance, it is necessary to develop an alterant which has excellent modification and refinement effects, long modification effectiveness, safety, environmental protection and mass production.
Disclosure of Invention
The invention aims to provide a cast aluminum alloy modifier which is simple in process, low in cost, excellent in performance and stable, and a preparation process thereof.
The aim of the invention can be achieved by the following technical scheme:
In a first aspect, the invention provides a cast aluminum alloy modifier, which comprises, by weight, 5-20% of Sb,5-10% of Ti,1-2% of B,2-5% of V,1-3% of La-Ce misch metal, trace amounts of Be and Hf, and the balance of Al.
Preferably, the cast aluminum alloy modifier material comprises, by weight, 10% Sb,5% Ti,1% B,3% V,1% La-Ce misch metal, 0.02% Be,0.05% Hf, and the balance Al.
In a second aspect, the invention also provides a preparation process of the cast aluminum alloy modifier, which comprises the following steps:
S1, weighing industrial pure aluminum and intermediate alloy raw materials according to the material components of the cast aluminum alloy modifier and the weight percentages of the components, and carrying out aluminum alloy batching;
S2, checking materials and tools, ensuring cleanliness and drying, putting a pure aluminum ingot into a crucible, electrifying and heating until the pure aluminum ingot is completely melted, heating, adding intermediate alloy raw materials in batches, keeping for 25min, and continuously stirring during the period to accelerate the melting and diffusion of alloy elements;
S3, adjusting the temperature of the aluminum liquid to 720-730 ℃, adding an Al-5Be intermediate alloy and an Al-2Hf intermediate alloy, pressing the intermediate alloy into the lower surface of the aluminum liquid to melt, and after all ingredients are melted, keeping the temperature of the aluminum liquid at 730 ℃ and stirring to remove slag;
s4, refining the melt twice;
s5, detecting the components of the aluminum liquid, adjusting the components to be qualified, preserving heat, and standing;
s6, casting the prepared alloy melt into a hexagon or trapezoid wire blank, performing continuous rolling on a plurality of groups of racks by using a rolling machine, rolling into a round wire rod with the diameter of 9-10 mm, and winding the round wire rod into a coil;
and S7, performing test verification on the prepared cast aluminum alloy modifier.
Preferably, the master alloy raw materials in the step S1 are Al-10Sb master alloy, al-10Ti master alloy, al-5B master alloy, al-5V master alloy, al-10Sb master alloy, la-Ce mixed rare earth master alloy, al-5Be master alloy and Al-2Hf master alloy.
Preferably, the specific step of S2 is that the temperature of the aluminum liquid is raised to 730 ℃, the surface scum is scraped off, the temperature is raised to 750-760 ℃, and Al-10Sb intermediate alloy, al-10Ti intermediate alloy, al-5B intermediate alloy, al-5V intermediate alloy, al-10Sb intermediate alloy and La-Ce mixed rare earth intermediate alloy are added in batches.
Preferably, the specific step S4 is as follows:
The first refining, namely keeping the temperature of the aluminum liquid at 720-730 ℃, adopting graphite rotary blowing to purify the aluminum liquid for 8 minutes, standing for 2-3 minutes after finishing the refining, and thoroughly skimming slag;
And (3) refining for the second time, namely keeping the temperature of the aluminum liquid at 710-720 ℃, purifying the aluminum liquid by adopting graphite rotary blowing and blowing, wherein the refining time is 6 minutes, and standing for 2-3 minutes after finishing, so as to thoroughly skim slag.
Further, in the step S4, the gas is high-purity argon gas in the step of blowing and purifying.
Preferably, the heat preservation temperature in the step S5 is 700-710 ℃, and the standing time is 20min.
Preferably, the casting temperature in the step S6 is 690-710 ℃, the rolling inlet temperature is 480-530 ℃ and the rolling finishing temperature is 250-280 ℃.
Preferably, the test verification in the step S7 comprises the steps of adding the cast aluminum alloy modifier material accounting for 1-15% of the total mass of the corresponding aluminum alloy into an AlSi10Mn aluminum melt, producing a die-casting product, sampling from a casting body after 24H, and carrying out tissue analysis and performance test.
Compared with the prior art, the invention has the following beneficial effects:
(1) The modifier raw material and the preparation process for casting aluminum alloy can effectively improve the modification effect of the structure and the performance of the casting aluminum alloy, ensure that the modification treatment of hypoeutectic casting aluminum-silicon alloy achieves the best effect, and simultaneously improve the problems of alpha-Al morphology and size, coarse eutectic silicon and Fe phase morphology and size in aluminum alloy melt, thereby improving the room temperature mechanical property of the casting aluminum alloy.
(2) The modifier for casting aluminum alloy provided by the invention adopts a continuous casting and rolling process method, so that the material and labor cost in production can be greatly reduced, batch production and high automation can be realized, and the modifier for casting aluminum alloy with high quality can be produced.
(3) The modifier for casting aluminum alloy prepared by the invention can be directly added into a casting aluminum alloy melt on line from launder aluminum liquid to cast a remelted ingot for use, and can also be directly put into a side furnace or a centralized smelting furnace of the casting aluminum alloy melt to be treated, thereby further improving the effect of modification treatment and production efficiency.
(4) The modifier for casting aluminum alloy prepared by the invention contains no Na and P elements in raw materials, can obviously improve the strength and plasticity of the casting aluminum alloy while refining grains, avoids the reduction of casting plasticity caused by Na and P modification, contains no Sr element, reduces the quality problem of melt gettering and hydrogen evolution caused by Sr of the aluminum alloy, and simultaneously avoids the poisoning effect caused by mixing Sr and B.
(5) The modifier for casting aluminum alloy prepared by the invention has the advantages that Sb element is added in the components of raw materials, the long-term deterioration can be inherited, the deterioration effect is not weakened due to remelting, the Hf element is added and combined with Al to generate Al 3 Hf particles, the heterogeneous nucleation is facilitated, the grain refinement effect is promoted, the toughness of the alloy is improved, la-Ce misch metal is added, the melt quality of the aluminum alloy is purified, the dendrite structure is refined, the generation of coarse lamellar and long needle-shaped beta-AlFeMnSi phases in the aluminum alloy is inhibited, and the strength and the plasticity of the cast aluminum alloy are enhanced.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic drawing of a continuous casting and rolling production of the present invention;
FIG. 2 is an OM, SEM organization chart of example 3 of the present invention;
FIG. 3 is an OM, SEM organization picture of comparative example 1;
FIG. 4 is an OM, SEM organization picture of comparative example 2;
fig. 5 is an OM, SEM tissue picture of comparative example 3.
Detailed Description
The following examples of the present invention are described in detail, and are given by way of illustration of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The cast aluminum alloy modifier comprises the following material components in percentage by weight of 5% of Sb,5% of Ti,1% of B,2% of V,1% of La-Ce mixed rare earth, 0.01% of Be and 0.01% of Hf, and the balance of Al. The preparation process comprises the following steps:
s1, weighing raw materials of industrial pure aluminum, al-10Sb intermediate alloy, al-10Ti intermediate alloy, al-5B intermediate alloy, al-5V intermediate alloy, al-10Sb intermediate alloy, la-Ce mixed rare earth intermediate alloy, al-5Be intermediate alloy and Al-2Hf intermediate alloy according to the material components of the cast aluminum alloy modifier and the weight percentages of the components, and carrying out aluminum alloy batching;
S2, putting a pure aluminum ingot into a crucible, electrifying and heating to be totally melted, heating to 730 ℃, removing surface scum, heating to 750-760 ℃, adding Al-10Sb intermediate alloy, al-10Ti intermediate alloy, al-5B intermediate alloy, al-5V intermediate alloy, al-10Sb intermediate alloy and La-Ce mixed rare earth intermediate alloy in batches, and keeping for 25min, wherein stirring is continuously performed during the period, so that melting and diffusion of alloy elements are accelerated;
S3, adjusting the temperature of the aluminum liquid to 720-730 ℃, adding an Al-5Be intermediate alloy and an Al-2Hf intermediate alloy, pressing the intermediate alloy into the lower surface of the aluminum liquid to melt, and after all ingredients are melted, keeping the temperature of the aluminum liquid at 730 ℃ and stirring to remove slag;
s4, refining the melt twice:
and (3) primary refining, namely keeping the temperature of the aluminum liquid at 720-730 ℃, adopting graphite rotary blowing to purify the aluminum liquid, adopting high-purity argon as refining gas, and standing for 2-3 minutes after refining is finished to thoroughly remove slag.
And (3) refining for the second time, namely keeping the temperature of the aluminum liquid at 710-720 ℃, adopting graphite rotary blowing and blowing to purify the aluminum liquid, adopting high-purity argon as refining gas, and standing for 2-3 minutes after refining is finished to thoroughly remove slag.
S5, detecting the components of the aluminum liquid, adjusting the components to be qualified, setting the aluminum liquid at 700-710 ℃, preserving the temperature, and standing for 20min;
s6, casting the prepared alloy melt into hexagonal or trapezoidal wire blanks at 690-710 ℃, continuously rolling in a rolling machine on a plurality of groups of racks, wherein the rolling temperature is 480-530 ℃, the final rolling temperature is 250-280 ℃, rolling into round wire rods with diameter of 9-10 mm, and winding;
And S7, performing test verification on the prepared cast aluminum alloy modifier, namely adding cast aluminum alloy modifier materials accounting for 5% of the total mass of the corresponding aluminum alloy into an AlSi10Mn aluminum melt, performing die casting product production, sampling from a casting body after 24H, and performing tissue analysis and performance test.
Example 2
The cast aluminum alloy modifier comprises, by weight, 10% of Sb,10% of Ti,2% of B,5% of V,3% of La-Ce mixed rare earth, 0.02% of Be and 0.05% of Hf as trace elements, and the balance of Al. The preparation process was the same as in example 1.
Example 3
The cast aluminum alloy modifier comprises, by weight, 10% of Sb,5% of Ti,1% of B,3% of V,1% of La-Ce mixed rare earth, 0.01% of Be and 0.02% of Hf as trace elements, and the balance of Al. The preparation process was the same as in example 1.
Example 4
The material composition and preparation process S1-S6 steps of the cast aluminum alloy modifier are the same as those of the embodiment 3, except that the cast aluminum alloy modifier material accounting for 1% of the total mass of the corresponding aluminum alloy is added into an AlSi10Mn aluminum melt in S7 for die casting product production, and sampling is carried out from a casting body after 24H for tissue analysis and performance test.
Example 5
The material composition and preparation process S1-S6 steps of the cast aluminum alloy modifier are the same as those of the embodiment 3, except that the cast aluminum alloy modifier material accounting for 10% of the total mass of the corresponding aluminum alloy is added into an AlSi10Mn aluminum melt in S7 for die casting product production, and sampling is carried out from a casting body after 24H for tissue analysis and performance test.
Example 6
The material composition and preparation process S1-S6 steps of the cast aluminum alloy modifier are the same as those of the embodiment 3, except that in S7, cast aluminum alloy modifier material accounting for 15% of the total mass of the corresponding aluminum alloy is added into an AlSi10Mn aluminum melt for die casting product production, and after 24H, samples are taken from a casting body for tissue analysis and performance test.
Comparative example 1
And (3) adding an Ai-5Ti-B alloy material accounting for 5% of the total mass of the corresponding aluminum alloy into the AlSi10Mn aluminum melt, producing a die casting product, sampling from a casting body after 24H, and carrying out tissue analysis and performance test.
Comparative example 2
And (3) adding an Ai-10Sr alloy material accounting for 5 percent of the total mass of the corresponding aluminum alloy into the AlSi10Mn aluminum melt, producing a die-casting product, sampling from a casting body after 24H, and carrying out tissue analysis and performance test.
Comparative example 3
And directly producing die casting products without adding modifier or refiner into AlSi10Mn aluminum melt, sampling from the casting body after 24H, and carrying out tissue analysis and performance test.
The AlSi10Mn die-cast aluminum alloys prepared in examples 1 to 6 and comparative examples 1 to 3 were subjected to a modification treatment, and the mechanical properties were measured as shown in table 1.
TABLE 1
As can be seen from the mechanical property detection results in Table 1, compared with the comparative example in which no modifier is added and Ai-5Ti-B and Ai-10Sr are added, the cast aluminum alloy modifier material is added into the AlSi10Mn die-cast aluminum alloy, so that the as-cast mechanical property of the alloy can be remarkably improved, the improvement effect is better, and the performance improvement of the alloy is more remarkable along with the improvement of the element content. Example 6 has a tensile strength of up to 290Mpa, a yield strength of up to 145Mpa and an elongation of up to 10.5%.
The AlSi10Mn die-cast aluminum alloys prepared in examples 1 to 6 and comparative examples 1 to 3 were subjected to a modification treatment, and the results of the texture analysis are shown in table 2.
TABLE 2
As can be seen from the results of the structure analysis of table 2 in combination with fig. 2 to 5, compared with the comparative examples in which no modifier was added and Ai-5Ti-B and Ai-10Sr were added, the α -Al size in the matrix structure of the examples was more uniform and finer, the eutectic Si was in the form of particles, the Fe phase was in the form of spheres, and the refining effect was more remarkable with the increase of the addition amount.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by a person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. A cast aluminum alloy modifier is characterized by comprising, by weight, 5-20% of Sb,5-10% of Ti,1-2% of B,2-5% of V,1-3% of La-Ce mixed rare earth, 0.01-0.02% of Be, 0.01-0.05% of Hf and the balance of Al.
2. The cast aluminum alloy modifier according to claim 1, wherein the cast aluminum alloy modifier material comprises, by weight, 10% Sb,5% Ti,1% B,3% V,1% La-Ce misch metal, 0.02% Be,0.05% Hf, and the balance Al.
3. The process for preparing a modifier for cast aluminum alloy according to claim 1, wherein the steps of:
S1, weighing industrial pure aluminum and intermediate alloy raw materials according to the material components of the cast aluminum alloy modifier and the weight percentages of the components, and carrying out aluminum alloy batching;
S2, checking materials and tools, ensuring cleanliness and drying, putting a pure aluminum ingot into a crucible, electrifying and heating until the pure aluminum ingot is completely melted, heating, adding intermediate alloy raw materials in batches, keeping for 25min, and continuously stirring during the period to accelerate the melting and diffusion of alloy elements;
S3, adjusting the temperature of the aluminum liquid to 720-730 ℃, adding an Al-5Be intermediate alloy and an Al-2Hf intermediate alloy, pressing the intermediate alloy into the lower surface of the aluminum liquid to melt, and after all ingredients are melted, keeping the temperature of the aluminum liquid at 730 ℃ and stirring to remove slag;
s4, refining the melt twice;
s5, detecting the components of the aluminum liquid, adjusting the components to be qualified, preserving heat, and standing;
s6, casting the prepared alloy melt into a hexagon or trapezoid wire blank, performing continuous rolling on a plurality of groups of racks by using a rolling machine, rolling into a round wire rod with the diameter of 9-10 mm, and winding the round wire rod into a coil;
and S7, performing test verification on the prepared cast aluminum alloy modifier.
4. The process for preparing a modifier for a cast aluminum alloy according to claim 3, wherein the master alloy raw material in the step S1 is Al-10Sb master alloy, al-10Ti master alloy, al-5B master alloy, al-5V master alloy, al-10Sb master alloy, la-Ce misch metal master alloy, al-5Be master alloy or Al-2Hf master alloy.
5. The process for preparing the modifier for the cast aluminum alloy according to claim 3, wherein the specific step of S2 is that the temperature of aluminum liquid is raised to 730 ℃, surface scum is scraped off, the temperature is raised to 750-760 ℃, and Al-10Sb intermediate alloy, al-10Ti intermediate alloy, al-5B intermediate alloy, al-5V intermediate alloy, al-10Sb intermediate alloy and La-Ce mixed rare earth intermediate alloy are added in batches.
6. The process for preparing a modifier for cast aluminum alloy according to claim 3, wherein the step S4 comprises the following specific steps:
The first refining, namely keeping the temperature of the aluminum liquid at 720-730 ℃, adopting graphite rotary blowing to purify the aluminum liquid for 8 minutes, standing for 2-3 minutes after finishing the refining, and thoroughly skimming slag;
And (3) refining for the second time, namely keeping the temperature of the aluminum liquid at 710-720 ℃, purifying the aluminum liquid by adopting graphite rotary blowing and blowing, wherein the refining time is 6 minutes, and standing for 2-3 minutes after finishing, so as to thoroughly skim slag.
7. The process for producing a modifier for cast aluminum alloy according to claim 6, wherein the step of purging with gas is performed with high purity argon.
8. A process for producing a modifier for cast aluminum alloy according to claim 3, wherein the heat-retaining temperature in S5 is 700 to 710 ℃ and the standing time is 20 minutes.
9. The process for producing a modifier for a cast aluminum alloy according to claim 3, wherein the casting temperature in S6 is 690-710 ℃, the rolling temperature is 480-530 ℃ and the finishing temperature is 250-280 ℃.
10. The process for preparing the modifier for the cast aluminum alloy according to claim 3, wherein the step of test verification in S7 is characterized in that the modifier material for the cast aluminum alloy according to the invention accounting for 1-15% of the total mass of the corresponding aluminum alloy is added into an AlSi10Mn aluminum melt for die casting product production, and sampling is carried out from a casting body after 24H for tissue analysis and performance test.
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