CN115522103B - Novel refining modifier for hypoeutectic aluminum-silicon alloy and preparation and application methods thereof - Google Patents

Abstract

The invention discloses a novel refining modifier for hypoeutectic aluminum-silicon alloy and a preparation and application method thereof, wherein the refining modifier is Al-Sr-Y-Sn novel refining modifier, and the components thereof comprise, by mass, 2.5-4% of Sr, 7-8.5% of Y, 0.1-2% of Sn and the balance of Al. The invention is different from the conventional production method that two metallurgical treatments of modification and refinement are needed, and the modification and refinement integrated function is realized by only adding the Al-Sr-Y-Sn intermediate alloy once; the method eliminates the deleterious effects of the mutual poisoning between Sr and B and between Ti and Si in the traditional method because B and Ti are not used; the method greatly reduces the actual addition amount of Sr, thereby effectively reducing the aspiration tendency of alloy melt; the novel modifier has low comprehensive use cost, and a rapid and convenient preparation process, and finally obtains hypoeutectic aluminum-silicon alloy with excellent microstructure and comprehensive mechanical properties.

Description

Novel refining modifier for hypoeutectic aluminum-silicon alloy and preparation and application methods thereof

Technical Field

The invention belongs to the field of smelting and processing of aluminum alloy materials, and particularly relates to a novel refining modifier for hypoeutectic aluminum-silicon alloy, and a preparation method and an application method thereof.

Background

Hypoeutectic Al-Si alloy has high specific strength, low density, small hot cracking tendency and good casting performance, and is widely applied to the industries of aviation, aerospace, automobiles, buildings and the like. However, the as-cast hypoeutectic aluminum-silicon alloy without modification has needle-shaped or plate-shaped eutectic silicon with an easily-broken matrix at the grain boundary, so that the comprehensive mechanical property of the alloy is not high, and therefore, modification treatment is required in actual production.

The most common use of hypoeutectic aluminum-silicon alloy production is Al-Sr modifier and Al-Ti-B refiner. The Al-Sr modifier can transform coarse flaky eutectic silicon into fine fibrous structures, and the mechanical properties, especially the toughness, of the modified alloy are obviously improved. Al-Sr has the advantages of good deterioration effect, long effective deterioration time and the like, but because the chemical property of Sr is very active, the Sr is very easy to burn in the adding process, and the defects of air holes and the like caused by the absorption of hydrogen in aluminum liquid are also easy to cause. Because of the mutual poisoning effect between Sr and B and between Ti and Si, the Al-Ti-B refiner is difficult to play a high-efficiency refining effect in the Sr modified hypoeutectic aluminum-silicon casting alloy.

Besides Sr, common modifying elements of hypoeutectic aluminum-silicon alloys include Sb, na, RE (rare earth element). The Na salt has obvious modification effect on hypoeutectic aluminum-silicon alloy, but has the problems of short effective time, easy splashing of molten metal, easy occurrence of insufficient modification or excessive modification and the like. The Sb element can make the eutectic Si structure highly branched and thinned in a sheet form, and the deterioration effect is not as good as that of Sr and Na. Among rare earth elements, other rare earth elements only play a refining role on eutectic Si except Eu and Sc; rare earth has a poor modification effect as Sr, and other rare earth elements only have the function of refining eutectic silicon except Eu which can modify the eutectic silicon into fiber shape. Aiming at the situation, scientific researchers continue to develop new modificators, and the mechanical properties of hypoeutectic aluminum-silicon alloy are further improved.

Patent CN111218577A discloses a preparation method and application of a composite refinement-modifier Al-Sr-Sc-Er for casting aluminum alloy, wherein after heat treatment, the microstructure of the A356.2 alloy added with the composite modifier is optimized, and the silicon phase is in a fine particle shape, so that the performance is greatly improved. Although the Al-Sr-Sc-Er has good modification effect, the preparation cost of the composite modifier is high, which is about twice the cost of the Al-Sr-Y-Sn alloy in the invention.

Patent CN113088732a discloses a rare earth metal doped composite modifier Al-Sr-RE and a preparation method thereof, wherein an aluminum material and a raw material containing Sr and RE are melted first, and then the melt is atomized into metal powder. The process has excellent alloy plasticity, but the preparation process is complex and has long period.

In the article "Investigation on the modification behavior of A356 alloy inoculated with a Sr-Y composite modifier", the use of Al-Sr and Al-Y to compound and modify a356 so that the Si phase is converted into a granular or flake form, but the mechanical properties of the alloy after compound modification are not explored (Journal of Rare Earths, vol.31, no.2, feb.2013).

In the article "influence of Sr-Y composite metamorphism on Al-7Si alloy structure and performance", by carrying out Al-Sr and Al-Y composite metamorphism on A356, the research shows that when 0.05 percent of Sr+0.15 percent of Y composite metamorphism agent is added, the alloy alpha-Al phase is highly refined into compact equiaxed crystal or elliptical crystal, and eutectic Si is changed into fine particles from coarse plate shapes and fiber shapes; the tensile strength of the alloy after compound modification reaches 296MPa after T6 heat treatment (material science and technology, 2021.Vol.29, no. 3). Compared with the refined modifier (theoretical Sr content: 90ppm, Y content: 240 ppm) in the present invention, the present invention has a problem of excessive content of modifying elements.

In summary, the current method for modification and refinement treatment of hypoeutectic aluminum-silicon alloy in industrial production is still not mature, and it is difficult to obtain fine alpha-Al and fibrous eutectic structures at the same time. Therefore, a stable, efficient and easy-to-operate treatment method is urgently needed to improve the ingot casting structure of aluminum-silicon alloy in industrial production.

Disclosure of Invention

Aiming at the defect of the existing hypoeutectic aluminum-silicon alloy modification, the invention provides a novel refining modifier suitable for hypoeutectic aluminum-silicon alloy, and the alloy simultaneously generates good and stable modification and refinement effects, so that the mechanical property is greatly improved. In addition, the novel refined modifier has the advantages of simple manufacturing process, lower production cost, short inoculation time and long effective modification time.

The invention adopts the following technical scheme to solve the technical problems:

the new type of refining modifier for hypoeutectic aluminium-silicon alloy has the components Al, sr, Y, sn, sr 2.5-4 wt%, Y7-8.5 wt%, sn 0.1-2 wt% and Al for the rest. The refining modifier has the advantages of integration of refining and modification, low air content, low cost, high efficiency, long modification effective time and the like. The refining modifier is prepared from Al-Sr, al-Y intermediate alloy and pure Al and Sn serving as raw materials. Al-Sr has a modification effect on hypoeutectic aluminum-silicon alloy; A1-Y has the functions of refining and modifying and purifying the melt; sn element can refine and round eutectic silicon particles and refine alpha-Al to a certain extent, and forms Mg with Mg element in a matrix ₂ Sn increases plasticity and in addition Sn improves the fluidity of the alloy. The novel Al-Sr-Y-Sn refining modifier prepared by the method can be used for simultaneously carrying out modification and refining treatment on hypoeutectic aluminum-silicon alloy, so that the mutual poisoning effect between Sr and B and between Ti and Si existing in the use of the Al-Sr modifier and the Al-Ti-B refiner is avoided, the microstructure optimization and the remarkable improvement of mechanical properties of the hypoeutectic aluminum-silicon alloy can be realized, and the higher industrial application use requirements are met.

The preparation method of the novel refining modifier comprises the following steps:

step 1: taking Al-Sr intermediate alloy, al-Y intermediate alloy, pure Al and pure Sn as raw materials, and weighing the raw materials according to a proportion for standby;

step 2: heating a smelting furnace to 700-850 ℃, adding pure Al, and preserving heat for 10-120min;

step 3: stabilizing the furnace temperature to 790+/-10 ℃, adding Al-Y intermediate alloy, and preserving heat for 10-60min;

step 4: when the temperature of the melt is reduced to 740+/-10 ℃, adding Al-Sr intermediate alloy, and preserving the heat for 2-30min;

step 5: adding pure Sn, and preserving heat for 5-8min;

step 6: after degassing and refining, standing for 5-30min, and removing surface scum;

step 7: pouring the molten metal prepared in the step 6 into a metal mold, and naturally cooling to room temperature to obtain the novel Al-Sr-Y-Sn refining modifier.

Further, in the steps 2 to 6, high-purity shielding gas (argon or nitrogen) is continuously introduced to prevent the alloy from being oxidized and burnt.

The invention also provides an application method of the novel refining modifier, which is used for realizing the integration of modification and refinement in the casting process of hypoeutectic aluminum-silicon alloy, and comprises the following steps:

step 1: weighing hypoeutectic aluminum-silicon alloy, and weighing Al-Sr-Y-Sn novel refinement modifier accounting for 0.3 weight percent of the mass of the hypoeutectic aluminum-silicon alloy;

step 2: heating a smelting furnace to the smelting temperature of the hypoeutectic aluminum-silicon alloy, adding the hypoeutectic aluminum-silicon alloy, preserving heat for 10-120min,

step 3: removing surface scum after degassing and refining;

step 4: adding Al-Sr-Y-Sn new type refining modifier, and preserving heat for 5-30min;

step 5: after degassing and refining, standing for 10-120min, and removing surface scum;

step 6: keeping the temperature of the melt within the range of 650-850 ℃, and casting the melt into a part or a casting blank to obtain the as-cast hypoeutectic aluminum-silicon alloy treated by the novel refining modifier;

step 7: t6 heat treatment is carried out on the cast hypoeutectic aluminum-silicon alloy to obtain the T6 hypoeutectic aluminum-silicon alloy with excellent structure and mechanical property.

Compared with the prior art, the invention has the beneficial effects that:

1. the novel refining modifier can refine primary alpha-Al while modifying hypoeutectic aluminum-silicon alloy; through the preparation of the novel refined modifier, the distribution of modified elements is more uniform, the effect of the modified elements is fully exerted, the structure morphology of hypoeutectic aluminum-silicon alloy can be obviously optimized, and the mechanical property is improved.

2. The novel refining modifier for Al-Sr-Y-Sn in the invention eliminates the mutual poisoning effect between Sr and B and between Ti and Si existing in the use of the traditional Al-Sr modifier and the traditional Al-Ti-B refiner, and realizes the microstructure optimization and the remarkable improvement of mechanical properties of hypoeutectic aluminum-silicon alloy.

3. The novel Al-Sr-Y-Sn refining modifier can achieve the required modification effect (change eutectic silicon into fiber shape) with lower Sr content; compared with the refining and modifying mode (0.3 wt.% of Al-10Sr+0.25wt.% of Al-5 Ti-B) used in the traditional industry, the price of the novel refining and modifying agent is reduced by about 50 percent.

4. The rare earth Y in the novel Al-Sr-Y-Sn refining modifier is easy to react with H in the aluminum liquid to generate stable rare earth hydride, thereby playing roles in fixing hydrogen and degassing, being matched with lower Sr content and effectively reducing the hydrogen content of the melt.

5. The novel Al-Sr-Y-Sn refining modifier provided by the invention takes Al-Sr and A1-Y intermediate alloy and pure Al and Sn as raw materials, has a simple preparation process, is convenient to operate, and is beneficial to large-area popularization and use in industry.

6. The novel Al-Sr-Y-Sn refining modifier has the advantages of short inoculation time and long deterioration aging time.

Drawings

FIG. 1 shows the as-cast metallographic structure of the A356 alloys obtained in the examples and comparative examples, wherein: (a) and (b) correspond to the low-power and high-power amplification of the alloy microstructure obtained in example 1, respectively, (c) and (d) correspond to the low-power and high-power amplification of the alloy microstructure obtained in example 2, respectively, (e) and (f) correspond to the low-power and high-power amplification of the alloy microstructure obtained in example 1, respectively, and (g) and (h) correspond to the low-power and high-power amplification of the alloy microstructure obtained in example 2, respectively.

FIG. 2 shows the T6 structure of the A356 alloy obtained in each of the examples and comparative examples, wherein: (a) corresponding example 1; (b) Corresponding to example 2, (c) corresponding to comparative example 1, and (d) corresponding to comparative example 2.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

Example 1

The embodiment provides a novel Al-Sr-Y refining modifier (the content of Sn is 0), which comprises the following components in percentage by mass: sr 3%, Y8% and the balance Al.

The preparation method of the novel refinement modifier comprises the following steps: firstly, cutting an Al-10Sr alloy ingot, an Al-20Y alloy ingot and pure Al (the purity is 99.99%), polishing, cleaning, drying and weighing for later use. Then, smelting is performed in a smelting furnace: placing a pure aluminum ingot into a crucible, and placing the crucible into a resistance furnace at 735+/-10 ℃; after pure Al is completely melted, preserving heat for 10-15min to homogenize the temperature of the melt, and then removing scum on the surface of the melt. Heating the furnace to 790+/-10 ℃, adding the weighed Al-Y intermediate alloy when the temperature of the melt is stable within a set temperature range, continuously stirring for 15 seconds, preserving heat for 20-30 minutes, and removing scum on the surface of the melt; when the temperature of the melt is reduced to 740+/-10 ℃, adding the weighed Al-Sr intermediate alloy, continuously stirring for 15 seconds, preserving the heat for 15-25 minutes, removing scum on the surface of the melt, standing for 3-5 minutes, and removing the surface scum. And finally, pouring the molten metal into a metal mold, and naturally cooling to room temperature to obtain the novel modifier. And (3) in the period from the placement of the pure aluminum ingot in the well-type resistance furnace to the completion of casting, introducing high-purity nitrogen as a protective gas in the whole process.

Taking A356 alloy as an example, the application method of the novel refining modifier in the embodiment comprises the following steps:

1000g of A356 alloy cast ingot is added into a graphite crucible with the preheating temperature of 300 ℃, then the temperature of a smelting furnace is raised to 735 ℃, and after the alloy is completely melted in the smelting furnace, the temperature is kept for 10 minutes, so that the temperature of a melt is uniform, and surface scum is removed. And then introducing high-purity nitrogen into the alloy liquid for refining for 8min, wherein the position of an air inlet pipe is about 1/4 of the bottom of the crucible. Then removing surface scum, wrapping the novel refined modifier (Sn content is 0) prepared in the embodiment accounting for 0.3wt.% of the mass of the A356 alloy cast ingot with pure aluminum foil, and putting the aluminum foil into an alloy liquid; after 5min of heat preservation, the mixture is mechanically stirred for 15s and then is further heat-preserved for 10min. Then high-purity nitrogen is introduced to refine for 8min again; removing surface scum, standing for 10min, and removing surface scum. And slowly casting the alloy liquid into a cast steel mould preheated to 200 ℃, and air-cooling to obtain the modified as-cast A356 alloy. The nitrogen flow rate in the nitrogen refining operation was 100mL/min.

The as-cast A356 alloy was solution treated at 535℃for 300 minutes with water at 20℃as the quenching medium. After the solution treatment is completed, the alloy is put into another heat treatment furnace for aging treatment, the quenching transfer time is 10s, the aging treatment temperature is 185 ℃, the heat preservation is carried out for 360min, and the alloy is taken out and then cooled to room temperature by air, so that the T6 state A356 alloy is obtained.

Cutting from castings to a size of 10X 6mm ³ The test piece is ground and polished, the test piece is corroded by adopting 0.5vol.% HF reagent for 10-12s, and then the surface of the test piece is cleaned by alcohol and dried for metallographic structure observation. Cutting a tensile sample on the cast ingot, polishing, and obtaining the sheet tensile sample after the surface of the sheet tensile sample is smooth and flat. The tensile property test is carried out by using AG-100KNXplus universal electronic testing machine (reference standard is GB/T228.1-2010), and the displacement control mode is adopted, so that the tensile speed is 1.2mm/min.

In this example, the metallographic structure of the sample in the as-cast state and the T6 state is shown in FIG. 1 (a), FIG. 1 (b) and FIG. 2 (a).

Example 2

The embodiment provides a novel Al-Sr-Y-0.5Sn refining modifier, which comprises the following components in percentage by mass: sr 3%, Y8%, sn 0.5% and the balance Al.

The preparation method of the novel refinement modifier comprises the following steps: firstly, cutting an Al-10Sr alloy ingot, an Al-20Y alloy ingot, pure Al (purity is 99.99%) and pure Sn (purity is 99.99%), polishing, cleaning, drying and weighing for later use. Then, smelting is performed in a smelting furnace: placing a pure aluminum ingot into a crucible, and placing the crucible into a resistance furnace at 735+/-10 ℃; after pure Al is completely melted, preserving heat for 10-15min to homogenize the temperature of the melt, and then removing scum on the surface of the melt. Heating the furnace to 790+/-10 ℃, adding the weighed Al-Y intermediate alloy when the temperature of the melt is stable within a set temperature range, continuously stirring for 15 seconds, preserving heat for 20-30 minutes, and removing scum on the surface of the melt; when the temperature of the melt is reduced to 740+/-10 ℃, adding the weighed Al-Sr intermediate alloy, continuously stirring for 15 seconds, preserving the heat for 15-25 minutes, and removing scum on the surface of the melt. Adding pure Sn into the molten metal, and preserving the temperature for 5-8min. Then high-purity nitrogen is introduced to refine for 8-10min, surface scum is removed, and the mixture is kept stand for 3-5min, and then the surface scum is removed. And finally, pouring the molten metal into a metal mold, and naturally cooling to room temperature to obtain the novel modifier. And (3) in the period from the placement of the pure aluminum ingot in the well-type resistance furnace to the completion of casting, introducing high-purity nitrogen as a protective gas in the whole process.

The application method, sample preparation and test steps of the novel refinement modifier of this example are the same as those of example 1.

In this example, the metallographic structure of the sample in the as-cast state and the T6 state is shown in FIG. 1 (c), FIG. 1 (d) and FIG. 2 (b).

Comparative example 1

The difference between this comparative example and example 1 is that: the novel refinement and modification agent in the application method of example 1 was replaced with 3g of Al-10Sr (0.03 wt.% Sr) master alloy and 15g of Al-20Y (0.3 wt.% Y) master alloy.

The as-cast and T6 metallographic structures of the samples in this comparative example are shown in FIG. 1 (e), FIG. 1 (f) and FIG. 2 (c).

Comparative example 2

The difference between this comparative example and example 1 is that: no modifier is added.

The as-cast and T6 metallographic structures of the samples in this comparative example are shown in FIG. 1 (g), FIG. 1 (h) and FIG. 2 (d).

Table 1: as-cast A356 alloy secondary diameter Space Dimension (SDAS) measurements in the examples and comparative examples above

Table 1 shows visually the SDAS sizes of the as-cast alloys of examples 1-2 and comparative examples 1-2, where the SDAS of the as-cast A356 alloy treated with the novel refining modifier was smaller than the alloy of comparative example, where the SDAS of the alloy of example 2 using the Al-Sr-Y-Sn refining modifier was minimal, 18.3 μm only, and was reduced by 18.3% and 49.9% respectively, as compared to the alloy of comparative examples 1-2.

Table 2: mechanical Properties of the alloys of the above examples and comparative examples before and after heat treatment

As can be seen from Table 2, the A356 alloy modified by the novel refining modifier of Al-3Sr-8Y-xSn (x=0 or 0.5) in the examples has improved tensile strength, yield strength and elongation to a different extent than the alloy in the comparative examples, whether in the as-cast state or the T6 state. In particular, the alloy of example 2 has the best mechanical properties in as-cast and T6 states, exceeding the values specified in the execution standard ASTM (tensile strength not less than 295MPa, elongation not less than 3%). Compared with the alloy T6 state subjected to Al-Sr and Al-Y composite modification in comparative example 1, the tensile strength, the yield strength and the elongation of the alloy T6 state in example 2 are respectively improved by 11.0%, 23.6% and 60%. Compared with the alloy T6 state without modification in the comparative example 2, the tensile strength, the yield strength and the elongation of the alloy T6 state in the example 2 are respectively improved by 29.6%, 42.7% and 197.1%, and the improvement range is particularly obvious.

FIGS. 1 (a), (c), (e) and (g) correspond to the morphology and distribution of primary alpha-Al in the metallographic structures of examples 1-2 and comparative examples 1-2, respectively. As can be seen, the as-cast A356 alloy modified by the Al-Sr-Y-Sn refinement modifier has the smallest secondary dendrite spacing size compared with the as-cast A356 alloy modified by the Al-Sr-Y modifier, the Al-Sr, the Al-Y composite modification and the non-modification, and the primary alpha-Al size is refined and distributed more uniformly.

FIGS. 1 (b), (d), (f) and (h) correspond to the morphology of eutectic silicon in the metallographic structures of examples 1-2 and comparative examples 1-2, respectively. It can be seen that the as-cast A356 alloy of comparative example 2, which was not modified, exhibited long needles in eutectic silicon morphology and severely fractured the matrix, resulting in reduced mechanical properties of the alloy. As-cast A356 alloy treated with Al-Sr-Y-Sn refinement modifier in examples 1-2, the eutectic silicon morphology was almost completely transformed into fibrous form. As-cast A356 alloy subjected to Al-Sr and Al-Y composite deterioration in comparative example 1, eutectic silicon is not completely converted into a fibrous form, and some eutectic silicon with larger size exists, so that the deterioration effect is inferior to that of the alloy in examples 1-2.

FIGS. 2 (a) - (d) correspond to the morphology of the eutectic silicon after heat treatment of the alloys of examples 1-2 and comparative examples 1-2, respectively, and the eutectic silicon has a higher roundness and a smaller average area than the modified and non-modified T6A 356 alloy of Al-Sr-Y modifier, and the modified T6A 356 alloy of Al-Sr-Y-Sn via the novel refined modifier.

In summary, the embodiment of the invention provides a novel refining modifier for hypoeutectic aluminum-silicon alloy, and a preparation method and application thereof, and the refining modifier has the advantages of low cost, high efficiency, simple operation, short inoculation time, suitability for industrial production and the like. Compared with the traditional Al-Sr and Al-Y composite modification, the novel refining modifier has the advantages of modification and refinement integration, low air content, low cost, high efficiency, long modification effective time and the like. The A356 alloy prepared by the novel refining modifier has excellent comprehensive mechanical properties, and the mechanical properties are further improved after T6 treatment.

Claims (5)

1. A novel refining modifier for hypoeutectic aluminum-silicon alloy, which is characterized in that: the refining modifier is a novel Al-Sr-Y-Sn refining modifier, and the components of the refining modifier comprise, by mass, 2.5-4% of Sr, 7-8.5% of Y, 0.1-2% of Sn and the balance of Al.

2. A method for preparing the novel refinement modifier according to claim 1, which is characterized by comprising the following steps:

step 1: taking Al-Sr intermediate alloy, al-Y intermediate alloy, pure Al and pure Sn as raw materials, and weighing the raw materials according to a proportion for standby;

step 2: heating a smelting furnace to 700-850 ℃, adding pure Al, and preserving heat for 10-120min;

step 3: stabilizing the furnace temperature to 790+/-10 ℃, adding Al-Y intermediate alloy, and preserving heat for 10-60min;

step 4: when the temperature of the melt is reduced to 740+/-10 ℃, adding Al-Sr intermediate alloy, and preserving the heat for 2-30min;

step 5: adding pure Sn, and preserving heat for 5-8min;

step 6: after degassing and refining, standing for 5-30min, and removing surface scum;

step 7: pouring the molten metal prepared in the step 6 into a metal mold, and naturally cooling to room temperature to obtain the novel Al-Sr-Y-Sn refining modifier.

3. The method of manufacturing as claimed in claim 2, wherein: and in the steps 2 to 6, high-purity protective gas is continuously introduced to prevent alloy oxidation and burning.

4. An application method of the novel refinement modifier according to claim 1, which is characterized in that: the method is used for realizing integration of modification and refinement in the casting process of hypoeutectic aluminum-silicon alloy.

5. The application method according to claim 4, comprising the steps of:

step 1: weighing hypoeutectic aluminum-silicon alloy, and weighing Al-Sr-Y-Sn novel refinement modifier accounting for 0.3 weight percent of the mass of the hypoeutectic aluminum-silicon alloy;

step 2: heating a smelting furnace to the smelting temperature of the hypoeutectic aluminum-silicon alloy, adding the hypoeutectic aluminum-silicon alloy, preserving heat for 10-120min,

step 3: removing surface scum after degassing and refining;

step 4: adding Al-Sr-Y-Sn new type refining modifier, and preserving heat for 5-30min;

step 5: after degassing and refining, standing for 10-120min, and removing surface scum;

step 6: keeping the temperature of the melt within the range of 650-850 ℃, and casting the melt into a part or a casting blank to obtain the as-cast hypoeutectic aluminum-silicon alloy treated by the novel refining modifier;

step 7: t6 heat treatment is carried out on the cast hypoeutectic aluminum-silicon alloy to obtain the T6 hypoeutectic aluminum-silicon alloy with excellent structure and mechanical property.

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