Aluminum alloy material and its manufacturing method

Abstract

To provide an aluminum alloy material for die-casting that can be manufactured at low price and demonstrates high strength and sufficient elongation as an aluminum alloy, and a method for manufacturing the same.SOLUTION: An aluminum alloy material for die-casting contains Si: 9.6 mass% to 12 mass%, Cu: 1.5 mass% to 3.5 mass%, Mg: more than 0.3 mass% to 1.6 mass%, Zn: 0.01 mass% to 3.5 mass%, Mn: 0.01 mass% to 0.7 mass%, Fe: 0.01 mass% to 1.3 mass%, and the balance being Al and inevitable impurities, when the total of the aluminum alloy material is 100 mass%, wherein a mass ratio of Fe to Mn (Fe / Mn) is 4.4 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an aluminum alloy material, particularly to an aluminum alloy material for die casting, and a method for producing the same. [Background technology]

[0002] In order to improve fuel efficiency and reduce power consumption by reducing the weight of automobile parts, the replacement of conventionally used iron-based materials with aluminum materials or aluminum alloy materials has been considered. Since these automobile parts require excellent corrosion resistance, high strength and workability, among the aluminum alloy materials, Al-Si-based alloys are widely used.

[0003] For example, Patent Document 1 describes an aluminum alloy for casting having excellent strength, which contains 9.0 to 12.0 mass% Si, 3.0 to 6.0 mass% Cu, 0.7 to 2.0 mass% Mg, 0.5 to 2.0 mass% Zn, 1.2 mass% or less Fe, and the balance being Al and unavoidable impurities.

[0004] Patent Document 2 describes a cast aluminum alloy that, when the whole is taken as 100 mass%, contains 9-12 mass% Si, 1-4 mass% Cu, 0.01-1 mass% Mg, 0.01-1 mass% Ni, 0.01-1 mass% Mn, 0.01-2 mass% Fe, and 0.01-2 mass% Zn, and in a cooling and solidification process in which a molten alloy made of the cast aluminum alloy is cooled and solidified, the cooling and solidification process contains 0.0001-0.5 mass% of a solute Si inhibitor that promotes crystallization of Si from the molten alloy and reduces the amount of Si that is solute in the Al-based matrix, and the remainder is Al and unavoidable impurities, and is characterized in that an aluminum alloy casting that has excellent dimensional stability even in an as-cast state can be obtained.

[0005] Patent Document 3 describes an aluminum alloy casting formed by die casting using an aluminum alloy for die casting, which contains 9.0 to 12.0 mass% Si, 0.20 to 0.80 mass% Mg, and 0.7 to 1.1 mass% Mn+Fe, has a Mn / Fe ratio of 1.5 or more, is restricted to 0.5 mass% or less Cu, is restricted to 0.05 mass% or less as unavoidable impurities Zn, Ni, and Sn, is restricted to 0.05 mass% or less as unavoidable impurities Pb and Bi are restricted to 0.005 mass% or less as unavoidable impurities, and the remainder is aluminum and unavoidable impurities, and is an electric heating part. The aluminum alloy casting has a heat dissipation fin (31) for an electric heat generating component (30), the heat dissipation fin (31) having a plurality of thin fin portions (31b) integrally formed on both the front and back sides of a flat base plate (31a), a circular mounting hole (31c) is provided in a flat portion of the base plate (31a) on which the thin fin portions (31b) are not formed, the electric heat generating component (30) is formed in a cylindrical outer shape, and the cylindrical electric heat generating component (30) is press-fitted and fixed into the circular mounting hole (31c). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 8-35030 [Patent Document 2] JP 2005-264301 A [Patent Document 3] JP 2011-132604 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional aluminum alloy materials for die casting (in this specification, etc., "aluminum alloy materials for die casting" refers to the raw material of aluminum die casting alloys (including the state of powder, molten metal, and casting (e.g., aluminum alloy ingot))) require high aluminum purity, which tends to result in high costs. Furthermore, aluminum alloys (in this specification, etc., "aluminum alloys" includes aluminum alloy materials for die casting (usually in the state of casting) and aluminum die casting alloys manufactured from aluminum alloy materials for die casting) are required to have not only high strength properties (e.g., hardness, tensile strength, yield stress), but also sufficiently good elongation properties (e.g., elongation rate), which may contradict the strength properties.

[0008] Therefore, an object of the present invention is to provide an aluminum alloy material for die casting that can be produced at low cost and has high strength characteristics and sufficient elongation characteristics as an aluminum alloy, and a method for producing the same. [Means for solving the problem]

[0009] In order to produce aluminum alloy materials for die casting at low cost, it is conceivable to use aluminum scrap as a raw material.

[0010] However, aluminum scrap, which is inexpensive as a raw material, contains large amounts of magnesium (Mg), zinc (Zn), and iron (Fe), which can cause a decrease in the tensile strength and elongation of aluminum alloys.

[0011] Therefore, the present inventors have investigated various means for solving the above problems, and as a result, have found that in an aluminum alloy material for die casting containing Fe, manganese (Mn), Mg and Zn, by adjusting the mass ratio of Fe to Mn (Fe / Mn), an aluminum alloy having high strength properties and sufficient elongation properties can be produced, and have completed the present invention.

[0012] That is, the gist of the present invention is as follows. (1) When the whole is 100% by mass, Si: 9.6% by mass to 12% by mass; Cu: 1.5% by mass to 3.5% by mass; Mg: more than 0.3% by mass to 1.6% by mass; Zn: 0.01% by mass to 3.5% by mass; Mn: 0.01% by mass to 0.7% by mass; Fe: 0.01% by mass to 1.3% by mass; Al and unavoidable impurities: balance and Including, The mass ratio of Fe to Mn (Fe / Mn) is 4.4 or less. Aluminum alloy material for die casting. (2) When the whole is 100% by mass, Si: 9.6% by mass to 12% by mass; Cu: 1.5% by mass to 3.5% by mass; Mg: 0.01% by mass to 1.6% by mass; Zn: more than 3.0% by mass to 3.5% by mass; Mn: 0.01% by mass to 0.7% by mass; Fe: 0.01% by mass to 1.3% by mass; Al and unavoidable impurities: balance and Including, The mass ratio of Fe to Mn (Fe / Mn) is 4.4 or less. Aluminum alloy material for die casting. (3) The aluminum alloy material for die casting according to (1) or (2), wherein the Mg content is 1.2 mass % to 1.6 mass %. (4) The aluminum alloy material for die casting according to any one of (1) to (3), wherein the Zn content is 3.3 mass % to 3.5 mass %. (5) The aluminum alloy material for die casting according to any one of (1) to (4), wherein the Mn content is 0.5 mass % to 0.7 mass %. (6) The aluminum alloy material for die casting according to any one of (1) to (5), wherein a mass ratio of Fe to Mn (Fe / Mn) is 2.6 or less. (7) The aluminum alloy material for die casting according to (6), wherein Fe and Mn form a blocky compound as a metal structure. (8)(i) preparing aluminum scrap; (ii) analyzing the composition of the aluminum scrap prepared in (i); (iii) A step of preparing a raw material of an aluminum alloy material for die casting by adjusting the aluminum scrap whose composition has been analyzed in the step (ii) so as to have a composition of the aluminum alloy material for die casting according to any one of (1) to (6); (iv) homogenizing the raw material of the die casting aluminum alloy material prepared in step (iii); 1. A method for producing an aluminum alloy material for die casting, comprising: (9) (i) A step of preparing an aluminum alloy material for die casting according to any one of (1) to (7); (ii) die casting the aluminum alloy material for die casting prepared in step (i); 1. A method for producing an aluminum die casting alloy, comprising: Effect of the Invention

[0013] The present invention provides an aluminum alloy material for die casting that can be produced at low cost and has high strength characteristics and sufficient elongation characteristics as an aluminum alloy, and a method for producing the same. [Brief description of the drawings]

[0014] [Figure 1] 1 is a graph showing the relationship between the Fe / Mn ratio (mass ratio) and the elongation of an aluminum alloy material for die casting. [Diagram 2] 1 is a SEM photograph showing the structure of the die-casting aluminum alloy materials of Examples 9 and 3. [Diagram 3] 1 is a graph showing the relationship between aging time T (LogT) and the hardness of the die-casting aluminum alloy materials of Comparative Example 3 and Example 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Preferred embodiments of the present invention will now be described in detail. In this specification, the features of the present invention will be described with reference to the drawings as appropriate. In the drawings, the dimensions and shapes of each part are exaggerated for clarity, and the actual dimensions and shapes are not accurately depicted. Therefore, the technical scope of the present invention is not limited to the dimensions and shapes of each part shown in these drawings. The aluminum alloy material for die casting and the manufacturing method thereof of the present invention are not limited to the following embodiments, and can be embodied in various forms with modifications and improvements that can be made by those skilled in the art within the scope of the gist of the present invention.

[0016] The present invention is characterized in that, when the whole is taken as 100 mass%, the composition contains 9.6 mass% to 12 mass% Si, 1.5 mass% to 3.5 mass% Cu, more than 0.3 mass% to 1.6 mass% Mg, 0.01 mass% to 3.5 mass% Zn, 0.01 mass% to 0.7 mass% Mn, 0.01 mass% to 1.3 mass% Fe, and the balance being Al and unavoidable impurities, or contains 9.6 mass% to 12 mass% Si. The present invention relates to an aluminum alloy material for die casting comprising: 1.5% by mass of Cu, 1.5% by mass to 3.5% by mass of Mg, 0.01% by mass to 1.6% by mass of Mg, more than 3.0% by mass to 3.5% by mass of Zn, 0.01% by mass to 0.7% by mass of Mn, 0.01% by mass to 1.3% by mass of Fe, and the balance being Al and unavoidable impurities, wherein a mass ratio of Fe to Mn (Fe / Mn) is equal to or less than a certain value.

[0017] The aluminum alloy material for die casting in the present invention is an aluminum alloy material containing silicon (Si), that is, an Al-Si based alloy.

[0018] In the present invention, the Si content in the aluminum alloy material for die casting is 9.6 mass % to 12 mass %, preferably 10.3 mass % to 12.0 mass %, based on the total mass of the aluminum alloy material.

[0019] The Si content can be measured by emission spectrometry.

[0020] In the present invention, when the content of Si in the aluminum alloy material for die casting is within the above range, a metal structure (intermetallic compound) such as Mg2Si is formed with Mg, and the aluminum alloy material has excellent mechanical properties, and the liquidus temperature range can be widened to increase the fluidity, and further the rigidity and wear resistance can be improved.

[0021] In the present invention, the content of copper (Cu) in the aluminum alloy material for die casting is 1.5 mass % to 3.5 mass %, preferably 1.8 mass % to 2.5 mass %, based on the total mass of the aluminum alloy material.

[0022] The Cu content can be measured by emission spectroscopy.

[0023] In the present invention, when the content of Cu in the aluminum alloy material for die casting is within the above range, a metal structure is formed between Cu and Al, and the tensile strength of the aluminum alloy can be improved.

[0024] In the present invention, the Mg content in the aluminum alloy material for die casting is more than 0.3 mass% to 1.6 mass%, preferably more than 0.55 mass% to 1.6 mass%, more preferably 1.2 mass% to 1.6 mass%, based on the total mass of the aluminum alloy material. In the present invention, the Mg content in the aluminum alloy material for die casting may be 0.01 mass% to 0.3 mass%, when the Zn content is more than 3.0 mass% to 3.5 mass%, based on the total mass of the aluminum alloy material.

[0025] The Mg content can be measured by emission spectroscopy.

[0026] In the present invention, by setting the Mg content in the aluminum alloy material for die casting within the above range, a metal structure, for example a Q phase, is formed between Al, Si, and / or Cu, and the tensile strength and material strength of the aluminum alloy can be improved.

[0027] In the present invention, the Zn content in the aluminum alloy material for die casting is 0.01 mass% to 3.5 mass%, preferably 3.3 mass% to 3.5 mass%, relative to the total mass of the aluminum alloy material. In the present invention, the Zn content in the aluminum alloy material for die casting is more than 3.0 mass% to 3.5 mass%, relative to the total mass of the aluminum alloy material, when the Mg content is 0.01 mass% to 0.3 mass%,.

[0028] The Zn content can be measured by emission spectrometry.

[0029] In the present invention, by making the Zn content in the aluminum alloy material for die casting fall within the above range, it is possible to improve the selection of raw materials and reduce the cost without negatively affecting the strength and corrosion resistance of the aluminum alloy.

[0030] In the present invention, the Mn content in the aluminum alloy material for die casting depends on the Fe content as described in detail below, but is 0.01 mass% to 0.7 mass%, preferably 0.5 mass% to 0.7 mass%, relative to the total mass of the aluminum alloy material.

[0031] The Mn content can be measured by emission spectroscopy.

[0032] In the present invention, when the Mn content in the aluminum alloy material for die casting is within the above range, a metal structure, for example, a blocky metal structure, is formed between the Mn and Al, Si, Mg and / or Fe, and deterioration in the toughness of the aluminum alloy can be suppressed.

[0033] In the present invention, the Fe content in the aluminum alloy material for die casting depends on the Mn content as described in detail below, but is 0.01 mass% to 1.3 mass%, preferably 0.6 mass% to 1.0 mass%, relative to the total mass of the aluminum alloy material.

[0034] The Fe content can be measured by emission spectrometry.

[0035] In the present invention, when the content of Fe in the aluminum alloy material for die casting is within the above range, a metal structure, for example, AlSiMgFeMn is formed with Mn, which improves the high-temperature strength of the aluminum alloy and suppresses seizure between the aluminum die casting alloy and a die during die casting.

[0036] In the present invention, the mass ratio of Fe to Mn (Fe / Mn) in the aluminum alloy material for die casting is 4.4 or less, preferably 2.6 or less, and more preferably 0.85 to 2.6.

[0037] In the present invention, by making the mass ratio of Fe to Mn in the aluminum alloy material for die casting fall within the above-mentioned range, compounds formed by Mn and Fe as a metal structure in the aluminum alloy are in the form of aggregate compounds, particularly in the form of aggregate compounds containing Mn when observed with a scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDS), and while the strength properties (e.g., hardness, tensile strength, yield stress) are increased, the elongation properties (e.g., elongation percentage) can be sufficiently ensured.

[0038] In addition to the above elements, the aluminum alloy material for die casting in the present invention may contain elements such as nickel (Ni), usually 0.5 mass% or less, tin (Sn), usually 0.3 mass% or less, chromium (Cr), usually 0.3 mass% or less, titanium (Ti), usually 0.1 mass% or less, and calcium (Ca), usually 0.1 mass% or less, relative to the total mass of the aluminum alloy material.

[0039] Furthermore, when the aluminum alloy material for die casting according to the present invention contains Sr and Na elements other than the above elements, the Si in the aluminum alloy can be made fine, and the strength and wear resistance of the aluminum alloy can be improved.

[0040] Table 1 shows the composition of the aluminum alloy material for die casting according to the present invention in comparison with conventional aluminum alloy materials for die casting.

[0041] [Table 1]

[0042] By the aluminum alloy material for die casting of the present invention having the above composition, even if the aluminum alloy material for die casting or the aluminum alloy of the present invention has a large content of Mg and / or Zn, the tensile strength after natural aging (25°C, 1800 hours or more) is usually 289 MPa or more, preferably 295 MPa to 322 MPa, the yield stress is usually 140 MPa or more, preferably 158 MPa to 222 MPa, the elongation is usually 1.0% or more, preferably 1.5% or more, more preferably 1.5% to 2.5%, and the elongation after natural aging (25°C, 1800 hours) is usually 1.0% or more. Each strength characteristic and elongation characteristic can be measured, for example, by the tensile test method for metallic materials of JIS Z2241.

[0043] In addition to the above-mentioned properties, the aluminum alloy material or aluminum alloy for die casting according to the present invention has good fatigue strength, corrosion resistance, crack propagation resistance, and permanent growth inhibition properties.

[0044] The aluminum alloy material for die casting in the present invention refers to the raw material of an aluminum die casting alloy. The aluminum alloy material for die casting in the present invention may be in a state such as a powder, in a molten metal state, or in a casting state, such as an aluminum alloy ingot state. In the present invention, the aluminum alloy includes the aluminum alloy material for die casting (usually in a casting state) and the aluminum die casting alloy produced from the aluminum alloy material for die casting, and since no change in composition occurs when producing the aluminum die casting alloy from the aluminum alloy material for die casting, the aluminum alloy material for die casting and the aluminum die casting alloy have the same composition.

[0045] In this specification, the term "casting" refers to a molded product produced by pouring a molten metal (including alloy) melted at high temperature into a hollow part (cavity) of a mold made of sand, metal, etc., and cooling and solidifying it. Therefore, the term "casting" includes molded products produced by low pressure casting, gravity casting, die casting, etc. On the other hand, the term "die cast alloy" refers to a molded product produced by pressurizing and injecting a molten alloy melted at high temperature into a hollow part of a mold made of metal, etc., at a pressure of, for example, usually 50 MPa to 120 MPa, preferably 50 MPa to 100 MPa, and cooling and solidifying it at a high speed, for example, at a cooling rate of usually 5°C / sec to 3000°C / sec, preferably 100°C / sec to 1000°C / sec, that is, a molded product produced by die casting.

[0046] The aluminum alloy material for die casting in the present invention can be molded by die casting to provide a lightweight material that can replace iron-based materials, and can be used, for example, in the fields of automobiles and motorcycles, for body structural members, chassis members, wheels, space frames, steering wheels (core metal), seat frames, suspension members, engine blocks, transmission cases, pulleys, oil pans, shift levers, instrument panels, door impact panels, intake surge tanks, pedal brackets, front shroud panels, and the like.

[0047] The aluminum alloy material for die casting in the present invention can be produced by techniques known in the art, except that the composition of the raw materials of the aluminum alloy material for die casting is adjusted to the composition of the aluminum alloy material for die casting in the present invention.

[0048] Since the aluminum alloy material for die casting in the present invention has a high content of Mg and / or Zn, aluminum scrap can be used as the raw material of the aluminum alloy material for die casting. Therefore, the aluminum alloy material for die casting in the present invention can be produced by a method including, for example, (i) a step of preparing aluminum scrap, (ii) a step of analyzing the composition of the aluminum scrap prepared in step (i), (iii) a step of preparing a raw material of the aluminum alloy material for die casting by adjusting the aluminum scrap whose composition has been analyzed in step (ii) to have the composition of the aluminum alloy material for die casting, and (iv) a step of homogenizing the raw material of the aluminum alloy material for die casting prepared in step (iii).

[0049] Steps (i) to (iv) are described below.

[0050] (i) preparing aluminum scrap; In step (i), aluminum scrap is prepared.

[0051] In step (i), examples of the aluminum scrap include ADC12 recycled scrap (Al-Si alloy) (including, for example, aluminum die-cast parts design products, defective products, chips, and collected products from the market), 5000 series scrap (Al-Mg alloy), 6000 series scrap (Al-Mg-Si alloy), 7000 series scrap (Al-Zn-Mg alloy) (including, for example, panel materials for automobiles and home appliances, wrought aluminum materials for radiators, and aircraft parts materials). Not only one type of aluminum scrap but also two or more types may be prepared.

[0052] In step (i), by preparing aluminum scrap, the cost of the aluminum alloy material for die casting can be reduced.

[0053] (ii) Analyzing the composition of the aluminum scrap In step (ii), the composition of the aluminum scrap prepared in step (i) is analyzed.

[0054] The composition of the aluminum scrap, in particular the contents of Si, Cu, Mg, Zn, Mn, and Fe, can be analyzed by, but is not limited to, optical emission spectroscopy, X-ray fluorescence analysis (XRF), or the like.

[0055] In step (ii), by analyzing the composition of the aluminum scrap, a raw material for die casting aluminum alloy material having the same composition as the die casting aluminum alloy material to be produced can be prepared in step (iii).

[0056] (iii) preparing a raw material of an aluminum alloy material for die casting In the step (iii), the aluminum scrap whose composition has been analyzed in the step (ii) is adjusted to have the composition of the aluminum alloy material for die casting, thereby preparing a raw material for the aluminum alloy material for die casting.

[0057] In step (iii), the raw material of the die-casting aluminum alloy material can be prepared, for example, by adding additives to aluminum scrap. The additives can be additives known in the art for adjusting the content of elements in the die-casting aluminum alloy material, such as one or more metals or alloys selected from the group consisting of Si, Cu, Mg, Zn, Mn, and Fe.

[0058] The raw material of the aluminum alloy material for die casting can be prepared, for example, by adjusting the mixing ratio of two or more types of aluminum scrap based on the analysis results of the composition of the aluminum scrap in step (ii).

[0059] (iv) homogenizing the raw material of the aluminum alloy material for die casting; In step (iv), the raw material of the aluminum alloy material for die casting prepared in step (iii) is homogenized.

[0060] In step (iv), the raw materials of the die-casting aluminum alloy material can be homogenized by, for example, simply mixing the raw materials of the die-casting aluminum alloy material. This method can be adopted when the raw materials of the die-casting aluminum alloy material are in a form that is easy to mix, such as a powder or granule.

[0061] Alternatively, in step (iv), an example of a method for homogenizing the raw material of the aluminum alloy material for die casting is a method of melting the raw material of the aluminum alloy material for die casting to prepare a molten aluminum alloy.

[0062] The prepared molten aluminum alloy can then be cast by an appropriate method selected from a conventional melting and casting method such as continuous casting, continuous casting and rolling, semi-continuous casting (DC casting) and hot top casting, or a die casting method. EXAMPLES

[0063] Several examples of the present invention will be described below, but it is not intended that the present invention be limited to those shown in these examples.

[0064] 1. Sample Preparation and Elongation Measurement The aluminum alloy materials for die casting of Comparative Examples 1 to 3 and Examples 1 to 9 were produced by melting the raw materials of the aluminum alloy materials for die casting containing the chemical components shown in Table 2, and the elongation (E) of each aluminum alloy was measured based on the tensile test method for metallic materials of JIS Z2241.

[0065] [Table 2]

[0066] FIG. 1 shows the relationship between the Fe / Mn ratio (mass ratio) and the elongation of aluminum alloy materials for die casting, based on Table 2.

[0067] From FIG. 1, it can be seen that the elongation rate increases as the Fe / Mn ratio (mass ratio) decreases.

[0068] 2. Structure measurement of aluminum alloy materials for die casting The structures of the die-casting aluminum alloy materials of Examples 9 and 3 were measured by SEM. FIG.

[0069] As shown in FIG. 2, in Example 9, the presence of an acicular metal structure formed of Fe, Si, and Al was observed, whereas in Example 3, the bulk of the metal structure was a blocky metal structure formed of Al, Si, Mg, Fe, and Mn.

[0070] It was found that sufficient elongation, especially elongation of 1.5% or more, can be ensured by forming agglomerated compounds of Al, Si, Mg, Fe and Mn as a metal structure in the aluminum alloy material for die casting.

[0071] 3.Mechanical property measurement of aluminum alloy materials for die casting The change in hardness due to natural aging (at about 25°C) was measured for the die-casting aluminum alloy materials of Comparative Example 3 and Example 4. Table 3 and Figure 3 show the relationship between the aging time T (LogT) and the hardness of the die-casting aluminum alloy materials of Comparative Example 3 and Example 4.

[0072] [Table 3]

[0073] 3, it was found that the die-casting aluminum alloy material of Example 4 had a higher hardness than the die-casting aluminum alloy material of Comparative Example 3. Moreover, the hardness did not change due to natural aging, and the die-casting aluminum alloy material of Example 4 had a higher hardness than the die-casting aluminum alloy material of Comparative Example 3 even after 1800 hours had passed.

[0074] Next, after natural aging for 1800 hours or more, the tensile strength, yield stress, and elongation of the die-casting aluminum alloy materials of Example 4 and Comparative Example 3 were measured based on the tensile test method for metallic materials of JIS Z2241. The results are shown in Table 4.

[0075] [Table 4]

[0076] From Table 4, it was found that the die casting aluminum alloy material of Example 4 had higher tensile strength and yield stress than the die casting aluminum alloy material of Comparative Example 3. In addition, the die casting aluminum alloy material of Example 4 had a lower elongation than the die casting aluminum alloy material of Comparative Example 3, but still had an elongation of 1.0% or more.

[0077] From the above, it has been found that the aluminum alloy material for die casting of the present invention has an elongation of 1.0% or more by a combination of natural aging and artificial aging, while having higher mechanical properties, such as tensile strength and yield stress, than conventional aluminum alloy materials for die casting.

Claims

1. When the total is 100% by mass, Si: 9.6% by mass to 12% by mass, Cu: 1.5% by mass to 3.5% by mass, Mg: 0.01% by mass to 1.6% by mass, Zn: more than 3.0% by mass to 3.5% by mass, Mn: 0.01% by mass to 0.7% by mass, Fe: 0.01% by mass to 1.3% by mass, and Al and inevitable impurities: balance It consists of: The mass ratio of Fe to Mn (Fe / Mn) is 4.4 or less; Aluminum alloy material for die casting.

2. The die casting aluminum alloy material according to claim 1, wherein the Mg content is 1.2% by mass to 1.6% by mass.

3. The die casting aluminum alloy material according to claim 1 or 2, wherein the Zn content is 3.3% by mass to 3.5% by mass.

4. The die casting aluminum alloy material according to any one of claims 1 to 3, wherein the Mn content is 0.5% by mass to 0.7% by mass.

5. The die casting aluminum alloy material according to any one of claims 1 to 4, wherein a mass ratio of Fe to Mn (Fe / Mn) is 2.6 or less.

6. 6. The aluminum alloy material for die casting according to claim 5, wherein Fe and Mn form a blocky compound as a metal structure.

7. (i) providing aluminum scrap; (ii) analyzing the composition of the aluminum scrap prepared in (i); (iii) A step of preparing a raw material of an aluminum alloy material for die casting by adjusting the aluminum scrap whose composition has been analyzed in the step (ii) so as to have a composition of the aluminum alloy material for die casting according to any one of claims 1 to 5; (iv) homogenizing the raw material of the die casting aluminum alloy material prepared in step (iii); 1. A method for producing an aluminum alloy material for die casting, comprising:

8. (i) preparing an aluminum alloy material for die casting according to any one of claims 1 to 6; (ii) die casting the aluminum alloy material for die casting prepared in step (i); 1. A method for producing an aluminum die casting alloy, comprising:

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