KR101434262B1 - Aluminium alloy and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing an aluminum alloy using a calcium-based additive and a silicon-based additive which are chemically more stable and economical in place of conventional metal calcium and pure silicon as a source of calcium and silicon to be added to aluminum, .
According to one aspect of the present invention, there is provided a method of manufacturing a metal mold, comprising: melting an aluminum base material to form a molten metal; Adding a calcium-based additive and a silicon-based additive to the molten metal; Exhausting at least a part of at least one of the calcium-based additive and the silicon-based additive in the molten metal; And casting the molten metal.

Description

TECHNICAL FIELD [0001] The present invention relates to an aluminum alloy and a manufacturing method thereof,

The present invention relates to an aluminum alloy and a method of manufacturing the same.

In an aluminum (Al) alloy, silicon (Si) is one of the main alloying elements following magnesium (Mg). For example, an aluminum-silicon (Al-Si) alloy may be used as a casting material or as a 4000 series body alloy in accordance with the American Aluminum Association. Further, an aluminum-magnesium-silicon (Al-Mg-Si) alloy is used as a casting material or as a 6000 series body alloy.

Silicon in casting materials can be used to produce alloys with low fluidity and ease of melt filling or alloys with low casting cracks. Even if a large amount of silicon is added to the molten aluminum, the molten metal can be maintained in a good state with almost no increase in viscosity or tendency to oxidize the molten metal, and the grain refinement can be facilitated by the improvement process of the process silicon and the superfine silicon. In these aluminum alloys, silicon is typically added in the form of pure silicon.

On the other hand, calcium can be used as an improved treatment agent for silicon in aluminum-silicon alloys, or it can be used to prevent oxidation of the surface of molten aluminum-magnesium alloy. Addition of a small amount of calcium to the aluminum-silicon alloy can also improve CaSi ₂ intermetallic compounds, thereby reducing the influence of dissolved silicon and improving electrical conductivity. However, metal calcium is very difficult to handle in the industrial field because it reacts with water at room temperature to generate hydrogen gas, so it is very difficult to handle in the industrial field. It is oxidized more than magnesium in aluminum melt and deteriorates the quality of the melt. Therefore, even though the improvement of the aluminum property is expected due to the addition of calcium, it has not yet achieved good results.

Japanese Unexamined Patent Application Publication No. 2011-104655 (2011.06.02.)

The present invention relates to a method of manufacturing an aluminum alloy using a calcium-based additive and a silicon-based additive which are chemically more stable and economical in place of conventional metal calcium and pure silicon as a source of calcium and silicon to be added to aluminum, . The foregoing problems have been presented by way of example and the scope of the present invention is not limited by these problems.

According to one aspect of the present invention, there is provided a method of manufacturing a metal mold, comprising: melting an aluminum base material to form a molten metal; Adding a calcium-based additive and a silicon-based additive to the molten metal; Exhausting at least a part of at least one of the calcium-based additive and the silicon-based additive in the molten metal; And casting the molten metal.

And adding at least a part of the calcium-based additive and the silicon-based additive to the molten metal after the step of adding the calcium-based additive and the silicon-based additive.

The calcium-based additive may include at least one of calcium oxide (CaO), calcium cyanide (CaCN ₂ ), and calcium carbonate (CaC ₂ ), and the silicon-based additive may include silicon oxide (SiO ₂ ).

The temperature of the molten metal in the depletion step can be maintained in the range of 650 ° C to 950 ° C.

The calcium-based additive and the silicon-based additive may be added sequentially or simultaneously.

The depletion step may be performed so that substantially all of the calcium-based additive and the silicon-based additive do not remain in the melt.

In the depletion step, at least a part of the calcium-based additive and the silicon-based additive are decomposed into calcium and silicon, respectively, and the calcium and silicon may be distributed in the aluminum matrix of the aluminum alloy at least partially in the form of a compound.

After the depletion step, the deoxidation step may further include removing the components other than the calcium-based additive, the silicon-based additive, or calcium that have not been consumed in the depletion step.

The depletion step may include stirring the upper portion of the melt, wherein the stirring may be performed at an upper portion within 20% of the total depth of the melt from the surface of the melt. Further, at least one of the calcium-based additive and the silicon-based additive may be decomposed on the surface portion of the molten metal by the stirring step.

The added amount of the calcium-based additive and the silicon-based additive may be limited to a range in which they are all exhausted in the molten metal and do not remain in the aluminum alloy.

Wherein the base material comprises an aluminum-magnesium alloy, and the calcium-based additive and the silicon-based additive are decomposed to generate calcium and silicon by the exhausting step, and at least a part of the calcium or silicon is contained in the molten aluminum and magnesium And at least one selected from the group consisting of an aluminum-calcium compound, a magnesium-calcium compound, a magnesium-aluminum-calcium compound and a magnesium-silicon compound is formed by reacting with at least one of them, or the calcium and silicon react with each other to form a calcium- can do.

At this time, the aluminum-calcium compound is Al ₄ Ca or Al ₂ Ca, Mg-Ca compound is Mg ₂ Ca, Al-Mg-Ca compounds (Mg, Al) ₂ Ca, the magnesium-silicon compound is Mg ₂ Si, the The calcium-silicon compound may include at least one of CaSi, CaSi ₂ , and Ca ₂ Si.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: melting an aluminum base material to form a molten metal; Adding calcium oxide and a silicon additive in the molten metal; Exhausting substantially all of the calcium oxide and silicon additive in the molten metal while controlling the molten metal to a temperature in the range of 650 ° C to 950 ° C; And a step of casting the molten metal so that the compound containing at least a part of at least one of calcium and silicon decomposed from the calcium oxide and the silicon additive is distributed in the aluminum matrix and the calcium oxide and the silicon additive are not substantially remained A process for producing an aluminum alloy, comprising the steps of:

According to another aspect of the present invention, there is provided an aluminum base; And a compound containing at least one of calcium and silicon existing in the second phase in the aluminum matrix; Wherein the compound is decomposed from calcium-based additives and silicon-based additives added in the molten metal during alloy casting, and calcium and silicon supplied are bonded to each other or combined with other elements.

The aluminum alloy may further include at least one of calcium dissolved in the aluminum matrix and silicon dissolved.

The aluminum matrix may be one in which magnesium is dissolved, and the compound may be at least one selected from an aluminum-calcium compound, a magnesium-calcium compound, a magnesium-aluminum-calcium compound, a magnesium-silicon compound and a calcium-silicon compound.

At this time, the aluminum-calcium compound is Al ₄ Ca or Al ₂ Ca, Mg-Ca compound is Mg ₂ Ca, Al-Mg-Ca compounds (Mg, Al) ₂ Ca, the magnesium-silicon compound is Mg ₂ Si, the The calcium-silicon compound may include at least one of CaSi, CaSi ₂ , and Ca ₂ Si.

In some cases, the aluminum base may further contain at least one of a non-decomposed calcium-based additive and a silicon-based additive.

According to the embodiment of the present invention as described above, a calcium-based additive and a silicon-based additive which are more economical and chemically stable instead of metal calcium and pure silicon are used as a source of calcium and silicon to be added to aluminum, An aluminum alloy to which calcium and silicon are added can be produced. The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a flowchart showing a method of manufacturing an aluminum alloy according to an embodiment of the present invention.
FIGS. 2A to 2F are analysis results of an aluminum alloy produced according to an experimental example of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

In embodiments of the present invention, aluminum may refer to pure aluminum. However, even if not specifically mentioned, such pure aluminum may further contain impurities (hereinafter, inevitable impurities) that are not intentionally added but inevitably contained during the manufacturing process.

In embodiments of the present invention, the aluminum alloy may refer to an alloy containing one or more additional elements in aluminum, which is the main element. However, such an aluminum alloy may further contain inevitable impurities other than the main element and the additive elements even if not specifically mentioned.

1 is a flowchart showing a method of manufacturing an aluminum alloy according to an embodiment of the present invention.

Referring to FIG. 1, a molten metal may be formed by dissolving an aluminum base material (S10). The base material may comprise, for example, pure aluminum or an aluminum alloy. The aluminum alloy refers to an alloy to which at least one additional element is added to aluminum, which is a main element, and may refer to a case where an additive element other than calcium is usually added. However, the scope of this embodiment does not exclude the case where calcium is added to the aluminum alloy of the base material as an additive element.

For example, the aluminum alloy of the base material may be wrought aluminum or 100 series, 200 series, 2000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series and 8000 series Series, 300 series, 400 series, 500 series, 700 series casting aluminum.

In the melt formation step S10, the base material can be dissolved in a suitable reaction, e.g., a crucible.

Heating of the crucible may be performed by any suitable heating means. For example, a resistance heating method, an induction heating method, a laser heating method, a plasma heating method, a hot air heating method, and the like can be used alone or in combination for heating the crucible.

Subsequently, a calcium-based additive and a silicon-based additive may be added to the molten metal (S11). At this time, the calcium-based additive may include at least one of calcium oxide (CaO), calcium cyanide (CaCN ₂ ), and calcium carbonate (CaC ₂ ) as a compound containing calcium. In addition, silicone-based additives may include a silicon oxide (SiO _2). These calcium-based additives and silicon-based additives are used as a supply source for supplying calcium and silicon into the molten metal, respectively.

The calcium-based additive and the silicon-based additive may be added in powder form having a wide surface area for improving the reactivity. However, this embodiment is not limited thereto, and may be added in the form of a pellet or a lump in which powder is agglomerated to prevent scattering of powder.

The size of the powdery calcium-based additive and the silicon-based additive needs to be appropriately controlled. For example, when the size of the powder is less than 0.1 탆, it may be too fine, scattered by hot air or aggregated with each other to form an aggregate, so that it can not easily mix with the liquid molten metal. On the other hand, when the powder size exceeds 500 탆, the time for reacting with the molten metal may become excessively long. However, the powder size may vary depending on the temperature control method of the melt, and this embodiment is not limited to this example.

The content of the calcium-based additive and the silicon-based additive can be appropriately selected depending on the use of the aluminum alloy to be produced. For example, the content of the calcium-based additive and the silicon-based additive may be limited so that substantially all of the content of the calcium-based additive and the silicon-based additive is exhausted in the molten metal. For example, the calcium-based additive and the silicon-based additive may be added in the range of 0.0001 wt% to 30 wt%, respectively, more strictly 0.01 wt% to 15 wt%.

The addition of the calcium-based additive and the silicon-based additive may be added in a multistage manner at a predetermined time after the required amount is added at a time or divided by an appropriate amount. When the calcium-based additive and the silicon-based additive to be added are fine powder, they can be introduced in multiple stages at different time intervals, thereby promoting the reaction of the calcium-based additive and the silicon-based additive while lowering the possibility of coagulation of the powder.

Further, the order of addition of the calcium-based additive and the silicon-based additive may be different from each other. For example, the calcium-based additive may be added first, and after a certain period of time, the silicon-based additive may be added or vice versa. As another example, the calcium-based additive and the silicon-based additive can be simultaneously added. At this time, it is also possible to add the calcium-based additive and the silicon-based additive in the form of a mixture in a predetermined ratio.

Meanwhile, in another embodiment, the base material, the calcium-based additive, and the silicon-based additive may be dissolved together to form a molten metal. In this case, the base material, the calcium-based additive, and the silicon-based additive may be previously mounted in the crucible. However, in this case, it may be difficult to control the reaction of the calcium-based additive and the silicon-based additive.

Subsequently, at least a part of the calcium-based additive and the silicon-based additive can be exhausted in the molten metal (S12). For example, a part of the calcium-based additive and the silicon-based additive may be decomposed in the molten metal to substantially exhaust the calcium-based additive and the silicon-based additive. Further, by activating this decomposition reaction, substantially all of the calcium-based additive and the silicon-based additive can be decomposed and exhausted. For example, the decomposition reaction of the calcium-based additive and the silicon-based additive can be promoted by maintaining the molten metal for a predetermined time or stirring the molten metal in the state where the calcium-based additive and the silicon-based additive are added. The depletion step (S12) may be referred to as a decomposition step in that the depletion of the calcium-based additive and the silicon-based additive substantially involves the decomposition of the calcium-based additive and the silicon-based additive.

In the depletion step, the temperature of the melt can be controlled in the temperature range of 650 ° C to 950 ° C. At a temperature lower than 650 ° C., the decomposition amount of the calcium-based additive added as a source of calcium and the silicon-based additive added as a supply source of silicon may be excessively small, and if the temperature is higher than 950 ° C., an economic loss due to an unnecessary increase in temperature may become a problem . At this time, as the temperature of the molten metal is increased, decomposition of the added calcium-based additive and silicon additive can be more actively performed.

If the addition of the additive is multistage, the addition step (S11) and the exhaustion step (S12) may be repeated. The depletion step can be further divided into more details about the reaction taking place in the depletion stage. The calcium-based additive can be decomposed into elements other than calcium and calcium, and the silicon-based additive decomposes into elements other than silicon and silicon . In order to activate the discharge of elements other than calcium and elements other than silicon, the surface of the molten metal may be exposed to the atmosphere, and these elements may escape to the outside through the surface of the molten metal. As another example, the elements other than calcium and oxygen may be removed after floating on the molten metal as a dross or a sludge.

For example, calcium oxide, one of the calcium-based additives, can be decomposed into calcium and oxygen in the melt. Calcium may remain in the melt or react with other elements, and oxygen may be substantially removed from the melt. For example, most of the oxygen may be released into the atmosphere in gaseous form, mostly through the surface of the melt exposed to the atmosphere, or may be removed after being suspended in the upper part of the melt by being contained in a dross or sludge. This can be similarly applied when the silicon oxide, which is a silicon additive, is decomposed into oxygen and silicon.

The calcium decomposed from the calcium-based additive can react with other elements to form a calcium-based compound. For example, react with aluminum to form an aluminum-calcium compound, such as Al ₄ Ca or Al ₂ Ca.

When the parent material is an aluminum alloy, an aluminum element other than aluminum and calcium may react with each other to form a calcium-based compound. For example, when the base material is an aluminum-magnesium alloy, the decomposed calcium may react with magnesium, which is an alloy element in the molten metal, to form a magnesium-calcium compound. For example, the magnesium-calcium compound may comprise a Mg ₂ Ca phase. In addition, calcium may react with aluminum and magnesium to form an aluminum-magnesium-calcium compound such as (Mg, Al) ₂ Ca.

The silicon decomposed from the silicon additive may remain in the molten metal or may react with other alloying elements to form a silicon-based compound. For example, silicon decomposed in a considerable number of alloys may remain in the aluminum matrix as primary or process silicon. Or when the aluminum base material is an aluminum-magnesium alloy, the decomposed silicon reacts with magnesium in the molten metal to form a magnesium-silicon compound as a silicon-based compound. For example, the magnesium-silicon compound may comprise a Mg ₂ Si phase.

As another example, the calcium decomposed from the calcium-based additive and the silicon decomposed from the silicon-based additive react with each other to form a calcium-silicon compound. For example, the calcium-silicon compound can be CaSi, CaSi ₂ And Ca ₂ Si, and the like.

Stirring of the molten metal can be accomplished in various ways. For example, stirring may be provided through a mechanical stirring device in the melt or through an electromagnetic field application device around the crucible. The electromagnetic field application device can perform agitation through convection of the melt by applying an electromagnetic field in the melt.

For example, the stirring may be started with the addition of the additive or after a certain time after the addition of the additive. As another example, stirring may start from the melt formation step. The stirring time may vary depending on the condition of the molten metal and the amount or form of the additive. For example, agitation may proceed until the additive is virtually invisible on the surface of the melt. However, even if the additive is not visible on the surface of the molten metal, the molten metal may remain in the molten metal, so stirring can be further advanced with the allowance of the maintenance time.

On the other hand, since the decomposition of the calcium-based additive and the silicon-based additive occurs at the surface of the molten metal in contact with the atmosphere, stirring the upper portion of the molten metal may be effective. For example, agitation can proceed from the surface of the melt to the upper part of the total height of the melt up to 20%, and particularly when it is desired to further activate the surface reaction, it can proceed from the surface of the melt up to 10% have.

The step of removing the dross floating on the surface of the molten metal after the step of exhausting the added calcium-based additive and the silicon-based additive may be further performed. At this time, the dross may contain components other than unreacted calcium-based additive, unreacted silicone additive, or calcium that have not been consumed in the depletion step.

Then, a molten metal is cast (S13) to produce an aluminum alloy. In the casting step S13, the temperature of the mold may have a temperature range of room temperature (e.g., 25 占 폚) to 400 占 폚. Further, the alloy can be separated from the mold after the mold is cooled to room temperature, but if the solidification of the alloy is completed even before the room temperature, the alloy can be separated from the mold.

For example, the mold may be any one selected from a mold, a ceramic mold, a graphite mold, and equivalents thereof. In addition, the casting method includes die casting, die casting, gravity casting, continuous casting, low pressure casting, squeeze casting, lost wax casting, thixo casting and the like.

Gravity casting refers to a method of injecting molten alloy into a mold by gravity and low pressure casting may refer to a method of injecting molten metal into a casting mold by applying pressure to the molten alloy melt surface using gas . Thixocasting is a semi-molten casting technique that combines the advantages of conventional casting and forging. The scope of this embodiment is not limited to the type of casting and the casting method described above.

When the calcium-based additive and the silicon-based additive are substantially exhausted in the molten metal, the calcium-based additive and the silicon-based additive are substantially not present in the cast aluminum alloy. Instead, as described above, at least a part of the calcium decomposed from the calcium-based additive may remain in the aluminum matrix or may be distributed as a compound in the aluminum matrix by reacting with other alloying elements. Further, at least a part of the silicon decomposed from the silicon additive may be dissolved in aluminum to remain as a primary or process silicon, or may be distributed as a compound by reacting with other elements. These compounds can be distributed in the second phase in an aluminum matrix, which has already been described in detail above, and a detailed description thereof will be omitted here.

In some cases, at least some of the decomposed calcium and silicon may be employed in an aluminum base. Or at least one of the calcium-based additive and the silicon-based additive added in some cases may not be completely exhausted in the molten metal, and in this case, at least one of the calcium-based additive and the silicon- .

When the aluminum base material includes an aluminum-magnesium alloy as described above, such a compound may include a magnesium-silicon compound such as Mg ₂ Si. According to this, Mg ₂ Si phase can be formed by the reaction without heat treatment by supplying the silicon-based additive in a molten state without supplying Si separately during the casting of the aluminum-magnesium-silicon (6000 series) alloy. It is surprising that a Mg ₂ Si phase can be formed in a 6000 series alloy without heat treatment, considering that the formation of Mg ₂ Si phase in a 6000-based alloy is usually formed by post-casting heat treatment. This Mg ₂ Si phase can induce the second phase strengthening effect and contribute to the improvement of the strength.

In addition, calcium and silicon components can be added to the aluminum alloy by adding a calcium-based additive and a silicon-based additive in place of metallic calcium and pure silicon to the aluminum-based base material. This method is very economical in that calcium-based additives and silicon-based additives rather than calcium and silicon are commercially available and inexpensively available.

 In addition, since a chemically stable calcium compound is used as a supply source for adding calcium to aluminum, calcium can be added economically and easily to aluminum as compared with the case of using metal calcium having high reactivity with oxygen.

In addition, the above-mentioned compounds, for example, calcium compounds, silicon compounds and calcium-silicon compounds are high-hardness and high-hardness intermetallic compounds in aluminum having a melting point, so that when such calcium compounds are distributed on an aluminum base, It can contribute to improvement of mechanical properties.

Hereinafter, experimental examples are provided to facilitate understanding of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

Experimental Example  One

 The aluminum base material used was an aluminum-magnesium alloy (Al-10Mg) to which 10 weight% of magnesium was added. 4500 g of the aluminum-magnesium alloy (Al-10Mg) was dissolved, and the temperature of the molten metal was maintained at 750 占 폚. 180 g of a mixture obtained by mixing 90 g of calcium oxide as a calcium-based additive and 90 g of a silicon-based additive was added to the molten metal prepared above. After the addition of the mixture, the mixture was stirred for about 1 hour, and after stirring was completed, the mixture was cast to prepare an aluminum-magnesium alloy.

Experimental Example  2

Experimental Example 2 was carried out under the same conditions except that the temperature of the molten metal was kept at 900 占 폚 and that the added calcium oxide and silicon additive were 150 g each and the weight of the mixture was 300 g.

The composition of the aluminum-magnesium alloy of Experimental Examples 1 and 2 was analyzed by ICP (inductively coupled plasma) analysis. Table 1 below shows the results according to the experimental examples.

Experimental Example 1 Experimental Example 2 Melt temperature 750 ℃ 900 ℃ Calcium component 0.022% (220 ppm) 0.21% Calcium reaction yield About 1% About 5% Silicon component 0.07% (700 ppm) 0.25% Silicon reaction yield About 3.5% About 7%

In the case of Experimental Example 1, there was no visual reaction, but about 0.022% (220 ppm) of calcium (Ca) and 0.07% (700 ppm) of silicon (Si) were detected as a result of component analysis. In the case of Experimental Example 2, a visual reaction was observed, and about 0.21% of calcium and 0.25% of silicon were detected by the component analysis. From this, it can be seen that when the temperature of the molten metal is 750 ° C, the calcium oxide decomposes into calcium and oxygen, the silicon additive decomposes into silicon and oxygen, and the decomposition yield of calcium and silicon is higher as the temperature of the melt increases to 900 ° C Able to know.

FIGS. 2A to 2F are photographs showing results of analysis of an aluminum alloy according to Experimental Example 2 of the present invention. FIG. 2A shows the microstructure of the alloy observed using back scattering electrons, and FIGS. 2B to 2F show the distribution of aluminum, magnesium, silicon, calcium, and oxygen as a result of EDS mapping. .

From FIGS. 2d to 2f, it can be seen that although silicon and calcium were detected, no oxygen was detected, and it was found that the added calcium oxide and silicon additive were substantially completely decomposed in the melt and remained in the aluminum base have. On the other hand, it is considered that at least a part of calcium and silicon react with each other to form a calcium-silicon compound in the sense that the position where the calcium is detected matches with the position where the silicon is detected.

The foregoing description of specific embodiments of the invention has been presented for purposes of illustration and description. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Do.

Claims (20)

Melting the aluminum base material to form a molten metal;
Adding a calcium-based additive and a silicon-based additive to the molten metal; And
And casting the molten metal. The method according to claim 1,
Further comprising the step of exhausting at least one of the calcium-based additive and the silicon-based additive in the molten metal after the step of adding the calcium-based additive and the silicon-based additive. The method according to claim 1,
Wherein the calcium-based additive comprises at least one of calcium oxide (CaO), calcium cyanide (CaCN ₂ ) and calcium carbonate (CaC ₂ ), and the silicon-based additive comprises silicon oxide (SiO ₂ ) Way. 3. The method of claim 2,
Wherein the temperature of the molten metal in the depletion step is maintained in the range of 650 ° C to 950 ° C. The method according to claim 1,
Wherein the calcium-based additive and the silicon-based additive are added sequentially or simultaneously with each other, 3. The method of claim 2,
Wherein the exhausting step is carried out so that all of the calcium-based additive and the silicon-based additive do not remain in the molten metal. 3. The method of claim 2,
In the depletion step, the calcium-based additive and the silicon-based additive are decomposed into calcium and silicon, respectively,
Wherein the calcium and silicon are distributed in an aluminum base of the aluminum alloy in the form of a compound. 3. The method of claim 2,
Further comprising the step of removing the components other than calcium-based additive, silicon-based additive or calcium which have not been consumed in the depletion step after the depletion step. 3. The method of claim 2,
Wherein the depletion step comprises stirring an upper portion of the molten metal. 10. The method of claim 9,
Wherein the stirring is performed in an upper portion of the surface of the molten metal within 20% of the total depth of the molten metal. 11. The method of claim 10,
Wherein at least one of the calcium-based additive and the silicon-based additive is decomposed on the surface portion of the molten metal by the stirring step. 3. The method of claim 2,
Wherein the addition amount of the calcium-based additive and the silicon-based additive is limited to a range in which all of the calcium-based additive and the silicon-based additive are not consumed in the molten metal and remain in the aluminum alloy. 3. The method of claim 2,
Wherein the base material comprises an aluminum-magnesium alloy,
The calcium-based additive and the silicon-based additive are decomposed by the exhausting step to produce calcium and silicon,
Wherein the calcium and silicon react with at least one of aluminum and magnesium in the melt to form at least one selected from the group consisting of an aluminum-calcium compound, a magnesium-calcium compound, a magnesium-aluminum-calcium compound, and a magnesium- And silicon react with each other to form a calcium-silicon compound. 14. The method of claim 13,
The aluminum-calcium compound is Al ₄ Ca or Al ₂ Ca, Mg-Ca compound is Mg ₂ Ca, Al-Mg-Ca compounds (Mg, Al) ₂ Ca, the magnesium-silicon compound is Mg ₂ Si, the calcium - The method for producing an aluminum alloy, wherein the silicon compound comprises at least one of CaSi, CaSi ₂ , and Ca ₂ Si. Melting the aluminum base material to form a molten metal;
Adding calcium oxide and a silicon additive to the molten metal;
Exhausting all of the calcium oxide and silicon additive in the molten metal while controlling the temperature of the molten metal in the range of 650 ° C to 950 ° C; And
A step of casting the molten metal so that the compound containing at least one of calcium and silicon decomposed from the calcium oxide and the silicon additive is distributed in the aluminum matrix and the calcium oxide and the silicon additive do not remain, ≪ / RTI > Aluminum base; And
And a compound containing at least one of calcium and silicon existing in the second phase in the aluminum matrix,
The compound is formed from calcium and silicon which are decomposed from the calcium-based additive and the silicon-based additive added in the molten metal during the alloy casting and bonded to each other or combined with other elements,
Wherein the aluminum base further contains at least one of a non-decomposed calcium-based additive and a silicon-based additive. 17. The aluminum alloy of claim 16, further comprising at least one of calcium and solid solution of silicon dissolved in the aluminum matrix. 17. The method of claim 16,
The aluminum base is made of magnesium-
Wherein the compound is at least one selected from an aluminum-calcium compound, a magnesium-calcium compound and a magnesium-aluminum-calcium compound, a magnesium-silicon compound and a calcium-silicon compound. 19. The method of claim 18,
The aluminum-calcium compound is Al ₄ Ca or Al ₂ Ca, Mg-Ca compound is Mg ₂ Ca, Al-Mg-Ca compounds (Mg, Al) ₂ Ca, the magnesium-silicon compound is Mg ₂ Si, the calcium - the aluminum compound comprises at least one of CaSi, CaSi ₂ , and Ca ₂ Si. delete

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