Sintered aluminum component

Abstract

The purpose of the present invention is to provide an aluminum sintered member having excellent tensile strength, stress corrosion cracking resistance, welding resistance, and fatigue strength. Provided is an aluminum sintered member which is a sintered molded product of a pure aluminum powder or an aluminum alloy powder other than an Al-Si-Mg alloy as a main component and an Al-Si-Mg alloy powder that contains 10-24 mass% of Si and 2-7 mass% of Mg, with the remainder comprising Al and unavoidable impurities, in the metal structure of the sintered aluminum component, the area ratio of a eutectic structure formed from the Al-Si-Mg alloy is 6%-30%, and the porosity of the sintered aluminum component is 5% or less.

Description

Technical Field

[0001] The present invention relates to an aluminum sintered component, and more particularly to an aluminum sintered component having excellent tensile strength, stress corrosion cracking resistance, weld resistance, and fatigue strength. Background Art

[0002] The shape and composition of sintered parts using metal powders have a high degree of freedom, and the loss of raw materials is reduced by near-net forming, and the processing steps are also reduced, so they are also concerned as automotive parts. Sintered parts using such metal powders are sometimes used for parts with complex shapes such as bearings and small gears in engine parts and drive system parts of automobiles, but as general sintered parts, iron-based alloy powders are mostly used as metal powders. In the case of sintered parts using aluminum powders such as pure aluminum and aluminum alloys, the oxide film generated on the surface hinders sintering, making it difficult to increase density and unsuitable for molded parts requiring high strength. On the other hand, although the development of aluminum nitride powder and aluminum oxide powder for sintering is also being carried out, there are problems with machinability and are therefore unsuitable for automotive parts.

[0003] In addition, laminated parts obtained by forming metal powder using a laminated molding method are also used as automotive parts, and this has been increasing in recent years. As a forming method based on the laminated molding method, the following method has been developed: each time the raw metal powder is stacked layer by layer, the raw material powder is selectively irradiated with a laser beam or an electron beam to perform direct sintering. Furthermore, in the binder jet method, which is a type of laminated molding method, there is a method of solidifying the metal powder by spraying a liquid binding material (binder) from a nozzle onto the metal powder. High productivity can be expected in the binder jet method, but since a sintering process is required after solidification, for the same reason as mentioned above, there are no actual applications using aluminum powder as a raw material. This technology has mostly been put into practical use with iron-based powders.

[0004] However, as automobile parts are required to be lightweight, aluminum applications are being developed continuously, and aluminum alloy powders with copper added have been proposed as aluminum alloy powders for aluminum sintered parts (for example, Japanese Patent Application Laid-Open No. 2009-7650). Summary of the Invention

[0005] However, sintered parts using the aluminum alloy powder described in Japanese Patent Application Laid-Open No. 2009-7650 are known to have insufficient strength for automotive parts, have problems with corrosion resistance, and sometimes have insufficient weldability.

[0006] Automobiles are required to be fuel-efficient, and lightweighting is one way to improve fuel efficiency. Therefore, the use of aluminum is expected to increase in the future. Furthermore, it is also expected that as process method development progresses, the number of parts using components manufactured using sintering and laminate molding methods will continue to increase. In order to ensure the quality of automobiles, these parts need to be further strengthened, and properties such as stress corrosion cracking resistance are required in sintered parts using aluminum. In particular, existing aluminum sintered parts have low strength and also have technical problems with stress corrosion cracking resistance and weldability. Therefore, the purpose of the present invention is to provide aluminum sintered parts with excellent tensile strength, stress corrosion cracking resistance, weldability, and fatigue strength.

[0007] The present inventors have conducted intensive research to achieve the above-mentioned objectives. As a result, they have discovered that by adding a predetermined Al-Si-Mg alloy powder to aluminum powder as the main component to use as the raw material powder, and controlling the area ratio of the eutectic structure of the Al-Si-Mg alloy in the aluminum sintered part and the porosity of the aluminum sintered part within predetermined ranges, the above-mentioned objectives can be achieved, thereby completing the present invention.

[0008] That is, the present invention is an aluminum sintered part, which is a sintered molded product of pure aluminum powder as a main component or aluminum alloy powder other than Al-Si-Mg alloy and Al-Si-Mg alloy powder, wherein the Al-Si-Mg alloy powder contains Si: 10% to 24% by mass and Mg: 2% to 7% by mass, and the remainder is composed of Al and unavoidable impurities. In the metal structure of the aluminum sintered part, the area ratio of the eutectic structure formed by the Al-Si-Mg alloy is 6% to 30%, and the porosity of the aluminum sintered part is less than 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is an optical microscope photograph of a sample of the aluminum sintered component produced in Example 1. DETAILED DESCRIPTION

[0010] Hereinafter, an aluminum sintered component according to one embodiment of the present invention will be described.

[0011] [Aluminum sintered parts]

[0012] One embodiment of the present invention is an aluminum sintered component comprising a sintered molded product composed primarily of pure aluminum powder or aluminum alloy powder other than an Al-Si-Mg alloy and Al-Si-Mg alloy powder. The Al-Si-Mg alloy powder comprises 10% to 24% by mass of Si and 2% to 7% by mass of Mg, with the remainder consisting of Al and inevitable impurities (inevitable impurities). The metallurgy of the aluminum sintered component comprises a eutectic structure formed by the Al-Si-Mg alloy at an area ratio of 6% to 30%, and a porosity of 5% or less. This invention enables the production of an aluminum sintered component exhibiting excellent tensile strength, stress corrosion cracking resistance, weld resistance, and fatigue strength.

[0013] Specifically, the aluminum sintered component of this embodiment is formed by mixing pure aluminum powder or aluminum alloy powder other than an Al-Si-Mg alloy as the main component with Al-Si-Mg alloy powder and sintering. The Al-Si-Mg alloy powder contains 10% to 24% Si and 2% to 7% Mg by mass, with the remainder consisting of Al and unavoidable impurities. The metallurgy of the aluminum sintered component comprises a eutectic structure formed by the Al-Si-Mg alloy at an area ratio of 6% to 30%, and a porosity of 5% or less.

[0014] (Raw material powder)

[0015] The aluminum sintered component of this embodiment is produced using raw material powder containing pure aluminum powder or aluminum alloy powder other than Al—Si—Mg alloy as a main component, and Al—Si—Mg alloy powder.

[0016] (Pure aluminum powder)

[0017] Pure aluminum powder is aluminum powder containing at least 99% by mass of aluminum. There are no specific limitations on the method for producing pure aluminum powder. Pure aluminum can be obtained from materials in the 1000 series, such as JIS A1100 and A1200. A combination of two or more pure aluminum powders may also be used.

[0018] (Aluminum alloy powders other than Al-Si-Mg alloys)

[0019] Aluminum alloy powders other than Al-Si-Mg alloys are not particularly limited as long as they are alloys other than the Al-Si-Mg alloys described below, but preferably have an Al content exceeding 50% by mass. Furthermore, while not particularly limited, preferably the Si and Mg contents are each less than 2% by mass, with the Mg content being greater than the Si content. The Al content in the aluminum alloy powder is more preferably 80% by mass or greater, further preferably 90% by mass or greater, even more preferably 93% by mass or greater, and even more preferably 95% by mass or greater.

[0020] In addition, the content of copper in the aluminum alloy powder, which may inhibit stress corrosion cracking resistance and weld resistance, is preferably less than 1% by mass, and more preferably 0.5% by mass or less.

[0021] There are no specific restrictions on how the aluminum alloy powder can be obtained. For example, aluminum 6000 series alloys such as JIS A6061, A6063, and A6101 can be used. These alloys are aluminum alloys with added magnesium and silicon, and offer excellent strength and corrosion resistance. Using these alloys further enhances the strength of sintered aluminum parts. Furthermore, a combination of two or more aluminum alloy powders may be used.

[0022] Here, the term "main component" refers to a component that comprises more than 50% by mass relative to the raw material powder. The content of pure aluminum powder or aluminum alloy powder other than an Al-Si-Mg alloy (also referred to as aluminum powder) in the raw material powder for the aluminum sintered component of this embodiment is not particularly limited as long as it exceeds 50% by mass, but is preferably between 70% and 94% by mass. This makes it easy to control the area ratio of the eutectic structure formed by the Al-Si-Mg alloy in the metallurgy of the aluminum sintered component within a specified range. As a result, the effects of the present invention can be more effectively achieved. When two or more aluminum powders are used in combination, their combined amount is preferably within the above-mentioned range.

[0023] (Al-Si-Mg alloy powder)

[0024] The Al—Si—Mg alloy powder contains 10% to 24% by mass of Si and 2% to 7% by mass of Mg, with the remainder being Al and inevitable impurities.

[0025] A technical problem with sintering aluminum powder is that the presence of a strong oxide film on the surface of the aluminum powder prevents densification during the sintering process, resulting in insufficient strength for the sintered component. In the aluminum sintered component of this embodiment, liquid-phase sintering is promoted by mixing Al-Si-Mg alloy powder with pure aluminum powder or aluminum alloy powder other than Al-Si-Mg alloy as the main component, thereby providing a high-density aluminum sintered component. Furthermore, since the addition of Cu as a strengthening element increases the susceptibility to weld cracking and stress corrosion cracking (promoting crack formation), Mg is selected as a strengthening element. Furthermore, increasing the amount of Mg added increases the susceptibility to weld cracking and stress corrosion cracking, thus establishing an upper limit for the Mg content.

[0026] (Silicon (Si): 10% to 24% by mass)

[0027] When the silicon content is less than 10% by mass, sufficient liquid phase sintering cannot be performed, densification cannot be achieved, and thus sufficient strength cannot be achieved. In addition, when the silicon content exceeds 24% by mass, the proportion of eutectic structure formed after sintering becomes too large, resulting in a decrease in strength.

[0028] (Magnesium (Mg): 2% to 7% by mass)

[0029] Like silicon, magnesium promotes liquid-phase sintering and reduces the oxide film on the aluminum surface, accelerating aluminum sintering. When the magnesium content is less than 2% by mass, the oxide film's reduction effect is minimal, preventing sufficient liquid-phase sintering. Consequently, densification is not achieved, and sufficient strength cannot be achieved. On the other hand, when the magnesium content exceeds 7% by mass, the risk of stress corrosion cracking increases.

[0030] (Aluminum (Al) and inevitable impurities: remainder)

[0031] The remainder of the Al-Si-Mg alloy powder, other than Si and Mg, consists of Al and inevitable impurities. Inevitable impurities refer to substances that are present in the raw materials or inevitably mixed in during the manufacturing process. Inevitable impurities are originally unnecessary, but they are in trace amounts and do not affect the properties of the Al-Si-Mg alloy powder or the aluminum sintered parts using them, so they are allowed impurities. The content of inevitable impurities is preferably less than 0.1% by mass, more preferably less than 0.01% by mass, relative to the Al-Si-Mg alloy powder.

[0032] It should be noted that the content of copper in the Al-Si-Mg alloy powder, which may hinder stress corrosion cracking resistance or weld resistance, is preferably less than 1 mass%, more preferably 0.5 mass% or less, further preferably 0.1 mass% or less, and most preferably 0 mass% (no copper).

[0033] The melting point of the Al-Si-Mg alloy powder is preferably lower than the melting point of the pure aluminum powder or aluminum alloy powder other than the Al-Si-Mg alloy as the main component. This can promote liquid phase sintering and more effectively obtain high-density aluminum sintered parts. The melting point of the Al-Si-Mg alloy powder is preferably about 30 to 70°C lower than the melting point of the main component. If the difference with the melting point of the main component is within the above range, the porosity is low and a dense aluminum sintered part can be obtained more effectively. The melting point of the Al-Si-Mg alloy powder can be, for example, about 590 to 630°C. The melting point of the Al-Si-Mg alloy powder can be controlled by adjusting the composition of the Al-Si-Mg alloy. For example, if the content of Si or Mg is increased, the melting point tends to increase. The melting point of the Al-Si-Mg alloy powder can be estimated from the phase diagram.

[0034] The content of the Al-Si-Mg alloy powder in the raw material powder of the aluminum sintered component of this embodiment is not particularly limited as long as it is less than 50% by mass, but is preferably 6% to 30% by mass. This makes it easy to control the area ratio of the eutectic structure formed by the Al-Si-Mg alloy in the metal structure of the aluminum sintered component within a specified range. As a result, the effects of the present invention can be more effectively achieved. When two or more Al-Si-Mg alloy powders are used in combination, their total amount is preferably within the above range.

[0035] The total content of the aluminum powder (pure aluminum powder or aluminum alloy powder other than an Al-Si-Mg alloy) and the Al-Si-Mg alloy powder in the raw material powder of the aluminum sintered component of this embodiment is not particularly limited, but is preferably 90% by mass or greater, more preferably 95% by mass or greater, and even more preferably 98% by mass or greater, relative to the total amount of the raw material powder. This allows for more pronounced effects of the present invention.

[0036] Furthermore, since automotive parts have technical problems such as stress corrosion cracking and welding, it is preferable that components containing elements that inhibit corrosion resistance and weldability, such as copper, are not added to the raw material powder of the aluminum sintered part of this embodiment.

[0037] In a preferred embodiment of the present invention, the raw material powder is primarily composed of pure aluminum powder, and the Al-Si-Mg alloy powder contains 10% to 24% Si and 3% to 7% Mg by mass, with the remainder consisting of Al and unavoidable impurities. This configuration further significantly enhances the effects of the present invention.

[0038] In another preferred embodiment of the present invention, the raw material powder is primarily composed of aluminum alloy powder, an Al-Si-Mg alloy powder containing 10% to 24% Si and 2% to 7% Mg by mass, with the remainder consisting of Al and unavoidable impurities. This composition further enhances the effects of the present invention. In particular, tensile strength and fatigue strength can be further improved. In this case, if the aluminum alloy powder is an aluminum 6000 alloy powder, the resulting aluminum sintered part is even denser, further enhancing the effects of the present invention.

[0039] (Elemental composition of aluminum sintered parts)

[0040] The elemental composition of the aluminum sintered component of this embodiment may be the same as the elemental composition of the mixed powder before sintering.

[0041] (Area ratio of eutectic structure formed by Al-Si-Mg alloy powder)

[0042] In the aluminum sintered component of this embodiment, the area ratio of the eutectic structure formed by the Al-Si-Mg alloy powder is 6% to 30%. When the area ratio of the eutectic structure is less than 6%, sufficient liquid phase sintering cannot be carried out, densification cannot be achieved, and therefore sufficient strength cannot be obtained. In addition, when the area ratio of the eutectic structure exceeds 30%, the eutectic structure tends to become brittle and sufficient strength cannot be obtained. The area ratio of the eutectic structure is preferably 6% to 24%. The area ratio of the eutectic structure can be controlled by the content of the Al-Si-Mg alloy powder. The area ratio of the eutectic structure can be obtained by the method described in the examples described below.

[0043] (Porosity of aluminum sintered parts)

[0044] The porosity of the aluminum sintered component of this embodiment is 5% or less. When the porosity exceeds 5%, densification cannot be achieved, and therefore sufficient tensile strength cannot be obtained. In addition, pores easily become the starting point of fatigue fracture, and therefore sufficient fatigue strength cannot be obtained. The porosity of the aluminum sintered component is preferably 4% or less. It should be noted that the lower limit of the porosity is not particularly limited, for example, it is 0.5% or more, preferably 1% or more. If it is within the above range, the effect of the present invention can be more significantly obtained. The porosity of the aluminum sintered component can be obtained by the method described in the embodiments described later. The porosity of the aluminum sintered component can be controlled, for example, by adjusting the type of aluminum powder as a raw material, the composition and content of the Al-Si-Mg alloy powder, the pressure, temperature, time during sintering, etc.

[0045] (Filling rate of aluminum sintered parts)

[0046] As described in the Examples below, the filling rate of an aluminum sintered component is the proportion of the portion excluding pores. Therefore, from the same perspective as above, the filling rate of the aluminum sintered component of this embodiment is 95% or greater, for example, 96% or greater. The upper limit of the filling rate is not particularly limited, but is, for example, 99.5% or less, for example, 99% or less.

[0047] (Method for manufacturing aluminum sintered parts)

[0048] The method for producing the aluminum sintered component of this embodiment is not particularly limited. For example, a method comprising a mixing step of mixing pure aluminum powder or aluminum alloy powder other than an Al-Si-Mg alloy as the main component with an Al-Si-Mg alloy powder to obtain a mixed powder, and a sintering step of sintering the mixed powder can be preferably used. This method can easily produce the aluminum sintered component of this embodiment.

[0049] (Mixing process)

[0050] In the mixing step, pure aluminum powder or aluminum alloy powder other than the Al—Si—Mg alloy as a main component is mixed with the Al—Si—Mg alloy powder to obtain a mixed powder.

[0051] As a mixing method, a known method can be appropriately adopted, for example, mixing using a mortar, dry ball mill, dynamic mill, bead mill, jet mill, hammer mill, disk mill, or pin mill. Of these, mixing using a dry ball mill is preferred.

[0052] The mixing conditions are not particularly limited, but the rotation speed is preferably 400 to 700 rpm. The mixing time is preferably 30 to 60 minutes.

[0053] (Sintering process)

[0054] In the sintering process, the mixed powder obtained in the mixing process is sintered. As a result, the mixed powder is solidified to obtain an aluminum sintered part. The sintering is preferably carried out under vacuum, for example, by vacuum hot pressing. The conditions for the sintering are not particularly limited. For example, the pressure during sintering is preferably 20 MPa to 40 MPa. In addition, the temperature is preferably 500°C to 580°C. In addition, the time is preferably 20 minutes to 80 minutes. In this way, an aluminum sintered part having a predetermined area ratio of eutectic structure and a predetermined porosity can be effectively obtained.

[0055] The aluminum sintered parts of this embodiment are lightweight, high in strength, and excellent in stress corrosion cracking resistance and weld resistance. Therefore, they are not particularly limited and can be suitably used in engine parts and drivetrain parts of automobiles.

[0056] It should be noted that the following embodiments are also included in the scope of the present invention: the aluminum sintered component according to claim 1 having the features of claim 2; the aluminum sintered component according to claim 1 having the features of claim 3; the aluminum sintered component according to claim 1 or 3 having the features of claim 4; and the method for manufacturing the aluminum sintered component according to any one of claims 1 to 4 having the features of claim 5.

[0057] Example

[0058] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[0059] (Example 1 to Example 8, Comparative Example 1 to Comparative Example 8)

[0060] Pure aluminum powder or aluminum alloy powder listed in Table 1 below was mixed with Al-Si-Mg alloy powder having the composition listed in Table 1 below using a dry ball mill (mixing conditions: rotation speed 550 rpm, time 45 minutes). The mixed powder was solidified through a sintering process to produce a sintered aluminum part. Sintering was performed using a vacuum hot press at a sintering pressure of 30 MPa, a sintering temperature of 540°C, and a sintering time of 50 minutes.

[0061] It should be noted that in Table 1 below, the composition of the Al-Si-Mg alloy powder includes Si and Mg in the amounts described in the table, with the remainder being Al and inevitable impurities. In addition, the melting point of the Al-Si-Mg alloy powder is a value estimated from the phase diagram. It should be noted that in Comparative Example 7, an Al-Cu alloy powder containing 5% by mass of Cu and the remainder being Al and inevitable impurities was used instead of the Al-Si-Mg alloy powder. In addition, in Comparative Example 8, an Al-Mg alloy powder containing 5% by mass of Mg and the remainder being Al and inevitable impurities was used instead of the Al-Si-Mg alloy powder.

[0062] (Measurement of the Area Ratio, Porosity, and Filling Ratio of Eutectic Structure Formed in Al-Si-Mg Alloys)

[0063] Samples cut from the aluminum sintered parts produced in each of the Examples and Comparative Examples were measured using the following methods to determine the area ratio of the eutectic structure formed by the Al-Si-Mg alloy (eutectic structure area ratio), the area ratio of the pores in the aluminum sintered parts (porosity), and the filling rate of the aluminum sintered parts.

[0064] First, the sample is cut into small sizes to prepare a specimen for measurement. The cross section of the specimen is mirror-polished, etched with nital, and an image is taken with an optical microscope. Next, the brightness threshold of the image is set in a manner that enables the eutectic structure to be identified, and binarization is performed to measure the area of ​​the eutectic structure. Then, the area of ​​the eutectic structure contained in this range is calculated as a percentage relative to the total area of ​​the range from the surface along the depth direction to 100 μm. Then, the porosity is also calculated using the same method to calculate the area ratio as a percentage. It should be noted that the filling rate of the aluminum sintered part is calculated as a percentage by taking the area ratio of the part other than the pores in the above-mentioned porosity measurement. The results are shown in Table 1 below.

[0065] Figure 1 This is an optical microscope photograph of a sample of the aluminum sintered component produced in Example 1. Figure 1 As shown, the metal structure of the aluminum sintered component of this example was confirmed to include a eutectic structure (white-appearing portion) and pores (black-appearing portion) formed of an Al-Si-Mg alloy in the α-Al phase.

[0066] (Tensile strength)

[0067] Samples cut out from the aluminum sintered parts produced in each example and comparative example were subjected to a tensile test in accordance with JIS Z 2241: 2011 to determine the tensile strength. The results are shown in Table 1. A sample having a tensile strength of 90 MPa or more can be preferably used.

[0068] (Stress corrosion cracking (SCC) resistance)

[0069] Stress corrosion cracking tests were conducted on samples cut from the aluminum sintered parts produced in each of the Examples and Comparative Examples. The stress corrosion cracking test evaluated the corrosion environment under stress loading conditions in accordance with JIS H 8711:2000. The results are shown in Table 1 below. Tests in which no corrosion cracking occurred within the specified time (1000 hours) were rated as "OK," while those in which corrosion cracking occurred were rated as "NG."

[0070] (Welding resistance)

[0071] Samples cut from the aluminum sintered parts produced in each example and comparative example were welded together using MIG welding to produce welded parts. Test pieces cut from these welded parts were subjected to tensile testing. The tensile testing was conducted in accordance with JIS H8711:2000. The results are shown in Table 1 below. A welded part was rated "OK" if its tensile strength was 90% or higher relative to the tensile strength of the base material (the aluminum sintered part before welding); a welded part was rated "NG" if its tensile strength was less than 90%.

[0072] (Fatigue strength)

[0073] Samples cut from the aluminum sintered parts produced in each of the Examples and Comparative Examples were subjected to rotating bending fatigue testing in accordance with JIS Z 2273:1978. The results are shown in Table 1 below. The rotating bending fatigue strength is expressed as a relative value, with the rotating bending fatigue strength of the aluminum sintered part in Example 1 set to 1.0. A rotating bending fatigue strength of 0.8 or greater is preferably usable.

[0074] In Table 1, regarding the comprehensive evaluation, the case where the tensile strength, stress corrosion cracking resistance, weld resistance, and fatigue strength were all suitable or OK was evaluated as OK, and the other cases were evaluated as NG.

[0075] [Table 1]

[0076] As shown in Table 1, the aluminum sintered parts of Examples 1 to 8 using a predetermined Al-Si-Mg alloy powder and having a eutectic structure area ratio and porosity within a predetermined range have excellent tensile strength, stress corrosion cracking resistance, weld resistance, and fatigue strength.

[0077] On the other hand, it can be seen that in Comparative Examples 1 to 8, in which any one of the composition of the Al-Si-Mg alloy powder, the area ratio of the eutectic structure, or the porosity deviates from the specified range, sintered parts excellent in tensile strength, stress corrosion cracking resistance, weld resistance, and fatigue strength cannot be obtained.

[0078] As mentioned above, although the present invention has been described by using several embodiments and examples, the present invention is not limited thereto, and various modifications are possible within the scope of the gist of the present invention.

[0079] For example, the configurations described in the above-mentioned embodiments and examples are not limited to each embodiment and example. For example, the composition of each embodiment and the detailed conditions during manufacturing can be changed, or the configurations of each embodiment and example can be set to combinations other than the above-mentioned embodiments and examples.

Claims

1. An aluminum sintered component, which is a sintered product of pure aluminum powder or aluminum alloy powder other than Al-Si-Mg alloy and Al-Si-Mg alloy powder as a main component, characterized in that: The Al-Si-Mg alloy powder contains Si: 10 mass% to 24 mass% and Mg: 2 mass% to 7 mass%, and the remainder is composed of Al and inevitable impurities. In the metal structure of the aluminum sintered component, the area ratio of the eutectic structure formed by the Al-Si-Mg alloy is 6% to 30%. The porosity of the aluminum sintered component is 5% or less.

2. The aluminum sintered component according to claim 1, characterized in that The main component is the pure aluminum powder, and the Al-Si-Mg alloy powder contains 10% to 24% by mass of Si and 3% to 7% by mass of Mg, with the remainder being Al and unavoidable impurities.

3. The aluminum sintered component according to claim 1, characterized in that The main component is the aluminum alloy powder.

4. The aluminum sintered component according to claim 3, characterized in that The aluminum alloy powder is aluminum 6000 series alloy powder.

5. A method for producing an aluminum sintered component according to any one of claims 1 to 4, characterized in that: include: a mixing step of mixing pure aluminum powder or aluminum alloy powder other than Al-Si-Mg alloy as the main component with the Al-Si-Mg alloy powder to obtain a mixed powder; The sintering and forming step is to sinter and form the mixed powder.

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