Wrought aluminum alloy and method for manufacturing the same, as well as rolled aluminum alloy and extruded aluminum alloy

Abstract

Even with a high Si content, cracking can be suppressed, and manufacturing costs can be reduced. [Solution] The wrought aluminum alloy 1 contains, with respect to the total mass of the aluminum alloy portion, Si: 4.0% to 13.0% by mass, Fe: 1.1% or less by mass (excluding 0% by mass), Mn: 1.0% or less by mass (excluding 0% by mass), Zn: 1.0% or less by mass (excluding 0% by mass), Ti: 0.02% to 0.13% by mass, and B: 0.0001% to 0.0015% by mass, and also contains at least one selected from Mg and Cu in the range of Mg: 0.2% to 0.8% by mass and Cu: 1.0% to 4.0% by mass, and the total of Al, Si, Fe, Mn, Zn, Ti, B, Mg and Cu is 98.5% or more by mass of the total mass of the wrought aluminum alloy 1. However, the wrought aluminum alloy 1 excludes forged materials.

Description

Technical Field

[0001] The present invention relates to an aluminum alloy drawn material, a method for producing the same, an aluminum alloy rolled material, and an aluminum alloy extruded material.

Background Art

[0002] In recent years, achieving carbon neutrality has become an issue for society as a whole, and various methods for solving the above problems have been studied. For example, from the perspective of resource depletion, recycling of various materials has progressed, and recycling of metals that are consumed in large quantities has been carried out for a long time. Aluminum consumes a large amount of electric power and emits CO2 during the production of new ingots. Therefore, by reducing the amount of new ingots used through recycling, the amount of CO2 emissions during the production of aluminum alloy materials can be significantly reduced. And in the field of aluminum alloy drawn materials, since the recovery amount of some aluminum alloy drawn materials from the market is poor, the reuse of aluminum alloy casting materials is also required.

[0003] <照 However, aluminum alloy casting materials have high Si and Fe contents, and in drawn materials, crystallized substances become the starting points of cracks, so cracks are likely to occur in the rolling process. Thus, it is difficult to manufacture a drawn material using a casting material with a high Si content as a recycling material.

[0004] Patent Document 1 proposes a method for producing an aluminum alloy for automotive members, in which aluminum alloy casting scraps are added with aluminum alloy drawn material scraps or ingots, melted to dilute impurities, and component adjustment is performed as necessary. Further, Patent Document 1 defines the composition of the aluminum alloy after melting, dilution, and component adjustment as necessary.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, even when using the manufacturing method described in Patent Document 1, the Si content in the alloy after component adjustment must be, for example, 4.85% by mass or less. Furthermore, if 100% of casting scrap or automobile casting scrap is used and the Si content in the alloy exceeds 5.0% by mass, for example, 9.5% by mass or more, the elongation and bendability of the resulting aluminum alloy material will be significantly reduced. In other words, with conventional methods, if the Si content in the casting scrap is high, it is necessary to reduce the Si content by dilution or component adjustment, which lowers the recycling rate.

[0007] The present invention has been made in view of the above problems, and aims to provide an aluminum alloy wrought material and a method for manufacturing the same that can be obtained by recycling die-cast alloy scrap and cast alloy scrap, which can be manufactured with a high recycling rate and can suppress the occurrence of cracks in the rolling process even with a high Si content. [Means for solving the problem]

[0008] The above objective is achieved by the aluminum alloy wrought material described below [1] according to the present invention.

[0009] [1] With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001 mass% or more and 0.0015 mass% or less, It contains, At least one selected from Mg and Cu, Mg: 0.2% by mass or more and 0.8% by mass or less, Contains Cu in the range of 1.0% by mass or more and 4.0% by mass or less. The aluminum alloy portion contains an aluminum alloy portion with a total amount of unavoidable impurities of 0.15% by mass or less. The sum of the aforementioned Al, Si, Fe, Mn, Zn, Ti, B, Mg, and Cu is 98.5% by mass or more of the total mass of the wrought aluminum alloy (however, the wrought aluminum alloy excludes forged materials).

[0010] Furthermore, preferred embodiments of the present invention relating to wrought aluminum alloys are described in the following [2] and [3].

[0011] [2] A core material consisting of the aluminum alloy part, The wrought aluminum alloy material according to [1], characterized in that it comprises a clad material having a skin material laminated on at least a portion of the surface of the core material.

[0012] [3] The leather material is Zn: 0.50 mass% or more and 6.00 mass% or less, Si: 0.05% by mass or more and 1.50% by mass or less, It contains Fe: 0.05% by mass or more and 2.00% by mass or less. Mg: 3.00% by mass or less, Mn: 1.80% by mass or less, Cu: 0.50% by mass or less, Cr: 0.30% by mass or less, Ti: 0.30% by mass or less, Zr: 0.30% by mass or less, The wrought aluminum alloy material according to [2], characterized in that V is 0.30 mass% or less, and the remainder consists of Al and unavoidable impurities, forming a sacrificial anode material.

[0013] The above objective is achieved by the method for manufacturing a wrought aluminum alloy according to the present invention [4].

[0014] [4] The manufacturing method of an aluminum alloy drawn material according to any one of [1] to [3], including a casting step of using at least one alloy scrap selected from die-cast alloy scrap and casting alloy scrap as a casting raw material A, melting the casting raw material A and a casting raw material B for addition, and casting an ingot; and a drawing step of drawing the ingot, wherein the casting raw material A contains 5.0 mass% or more and 18.0 mass% or less of Si, 1.3 mass% or less of Fe, 1.0 mass% or less of Mn, and 1.5 mass% or less of Zn, contains at least one selected from Mg and Cu in the range of 0.2 mass% or more and 1.0 mass% or less of Mg, and 1.0 mass% or more and 5.0 mass% or less of Cu, and the aluminum alloy part is composed of the ingot, and the manufacturing method of the aluminum alloy drawn material is characterized in that.

[0015] Further, a preferred embodiment of the present invention relating to the manufacturing method of the aluminum alloy drawn material relates to the following [5] to [7].

[0016] [5] The manufacturing method of the aluminum alloy drawn material according to [4], characterized in that the recycling rate representing the ratio of the mass of the casting raw material A to the total mass of the ingot is 60% or more.

[0017] [6] The aluminum alloy drawn material is a clad material including a core material composed of the aluminum alloy part and a skin material combined with at least a part of the surface of the core material, and before the drawing step, it has a skin material ingot casting step of melting a casting raw material C for the skin material and casting an ingot for the skin material, and in the drawing step, the combined material combining the ingot for the core material and the ingot for the skin material is drawn, and the manufacturing method of the aluminum alloy drawn material according to [4] or [5] is characterized in that.

[0018] [7] The wrought aluminum alloy material is a clad material comprising a core material composed of the aluminum alloy portion and a clad material combined on at least a part of the surface of the core material, A process for casting ingots for leather materials, in which raw material C for leather materials is melted and ingots for leather materials are cast, The process includes a leather material manufacturing step of producing a leather material by a method of stretching the ingot for leather material or by a method of slicing the ingot for leather material, A method for producing a wrought aluminum alloy according to [4] or [5], characterized in that, in the drawing step, a combined material consisting of the ingot for the core material and the outer material is drawn.

[0019] The above objectives are achieved by the aluminum alloy rolled material described below [8] according to the present invention.

[0020] [8] With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001 mass% or more and 0.0015 mass% or less, It contains, At least one selected from Mg and Cu, Mg: 0.2% by mass or more and 0.8% by mass or less, Contains Cu in the range of 1.0% by mass or more and 4.0% by mass or less. The aluminum alloy portion contains an aluminum alloy portion with a total amount of unavoidable impurities of 0.15% by mass or less. A rolled aluminum alloy material characterized in that the sum of Al, Si, Fe, Mn, Zn, Ti, B, Mg, and Cu is 98.5% by mass or more of the total mass of the wrought aluminum alloy material.

[0021] The above objectives are achieved by the aluminum alloy extruded material described below [9] according to the present invention.

[0022] [9] With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001 mass% or more and 0.0015 mass% or less, It contains, At least one selected from Mg and Cu, Mg: 0.2% by mass or more and 0.8% by mass or less, Contains Cu in the range of 1.0% by mass or more and 4.0% by mass or less. The aluminum alloy portion contains an aluminum alloy portion with a total amount of unavoidable impurities of 0.15% by mass or less. An aluminum alloy extruded material characterized in that the sum of Al, Si, Fe, Mn, Zn, Ti, B, Mg, and Cu is 98.5% by mass or more of the total mass of the wrought aluminum alloy material. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a wrought aluminum alloy, a method for manufacturing the same, a rolled aluminum alloy, and an extruded aluminum alloy, which can suppress the occurrence of cracks even with a high Si content and reduce manufacturing costs. [Brief explanation of the drawing]

[0024] [Figure 1] Figure 1 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to the first embodiment of the present invention. [Figure 2]Figure 2 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to a second embodiment of the present invention. [Figure 3] Figure 3 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to a third embodiment of the present invention. [Figure 4] Figure 4 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to the fourth embodiment of the present invention. [Figure 5] Figure 5 is a schematic cross-sectional view showing another example of the shape of an aluminum alloy wrought material manufactured by the manufacturing method according to an embodiment of the present invention. [Figure 6] Figure 6 is a schematic diagram illustrating the method for evaluating cracking in the obtained wrought aluminum alloy material. [Modes for carrying out the invention]

[0025] The inventors of this invention have diligently investigated the causes of cracking during the rolling of ingots using die-cast alloy scraps and cast alloy scraps as raw materials. The behavior of cracking is greatly influenced by the material structure; the larger the crystal grains, the greater the surface roughness during processing deformation, leading to the formation of constrictions, stress concentration, and increased susceptibility to fracture. Furthermore, the higher the amount of Si and Fe compounds (crystallized products), the more dimples (voids) formed on the compounds during processing deformation, making fracture more likely. In particular, since cast materials have a high Si content, Si greatly influences the occurrence of cracks. Therefore, the inventors of this invention have found a specific component and its optimal content that has the effect of refining the crystal grain size and refining and dispersing the compounds. Specifically, by simply adding the appropriate component to die-cast alloy scraps and cast alloy scraps with high Si content to control the composition to a predetermined level, it is possible to efficiently and inexpensively manufacture wrought aluminum alloys with suppressed cracking.

[0026] The following describes an embodiment of the present invention concerning a wrought aluminum alloy and a method for producing the same. In this specification, "wrought aluminum alloy" may be simply referred to as "wrought material."

[0027] [Wrought aluminum alloy] The wrought aluminum alloy material according to this embodiment has an aluminum alloy portion having the alloy composition shown below. The chemical components contained in the aluminum alloy portion included in the wrought aluminum alloy material and the reasons for limiting their content will be explained in detail below.

[0028] <Aluminum alloy part> (Si: 4.0 mass% or more and 13.0 mass% or less) Si is an element that promotes crack formation during drawing because it readily forms Si compounds and Si grains. Si is an element commonly found in die-cast alloy scrap and cast alloy scrap. For example, the Si content in ADC12 material specified in JIS H 5302:2006 for aluminum alloy die casting is 9.6 to 12.0 mass%, and the Si content in ADC14 material is 16.0 to 18.0 mass%. In this embodiment, the grain size can be refined and the compounds dispersed by the elements described later, so that even with a high Si content, crack formation during drawing can be suppressed while maintaining a high recycling rate.

[0029] If the Si content in the aluminum alloy is less than 4.0% by mass, it becomes necessary to reduce the amount of high-Si-content die-cast alloy scrap and cast alloy scrap used, making it impossible to improve the recycling rate. Furthermore, a low Si content in the aluminum alloy makes cracking less likely, eliminating the need to add elements that refine Si particles, as described later. Therefore, the Si content in the aluminum alloy should be 4.0% by mass or more, preferably more than 5.0% by mass, and more preferably 6.0% by mass or more, relative to the total mass of the aluminum alloy. On the other hand, if the Si content in the aluminum alloy exceeds 13.0% by mass, cracking is more likely to occur during drawing. Therefore, the Si content in the aluminum alloy should be 13.0% by mass or less, preferably 12.0% by mass or less, and more preferably 11.0% by mass or less, relative to the total mass of the aluminum alloy.

[0030] (Fe: 1.1% by mass or less (excluding 0% by mass)) Fe is an element that readily forms compounds and promotes crack formation during drawing. Fe is a common element found in die-cast alloy scrap and cast alloy scrap. For example, the Fe content in ADC12 material specified in JIS H 5302:2006 for aluminum alloy die castings is 1.3 mass% or less, and the Fe content in AC4C material specified in JIS H 5202:2010 for aluminum alloy castings is 0.5 mass% or less. Regardless of these upper limits, if the Fe content in the aluminum alloy exceeds 1.1 mass%, cracking is more likely to occur during drawing. Therefore, the Fe content in the aluminum alloy should be 1.1 mass% or less relative to the total mass of the aluminum alloy, preferably 1.0 mass% or less, more preferably 0.8 mass% or less, and even more preferably 0.6 mass% or less. However, this excludes the case where the Fe content in the aluminum alloy is 0 mass%.

[0031] (Mn: 1.0% by mass or less (excluding 0% by mass)) Mn is a component commonly found in die-cast alloy scrap and cast alloy scrap. For example, the upper limit for Mn content in AC4C material specified in JIS H 5202:2010 for aluminum alloy castings is 0.6 mass%, but the aluminum alloy portion in this embodiment may contain more Mn than that. However, if the Mn content in the aluminum alloy portion exceeds 1.0 mass%, cracking is more likely to occur during drawing. Therefore, the Mn content in the aluminum alloy portion should be 1.0 mass% or less, preferably 0.8 mass% or less, and more preferably 0.6 mass% or less, relative to the total mass of the aluminum alloy portion. However, this excludes the case where the Mn content in the aluminum alloy portion is 0 mass%.

[0032] (Zn: 1.0% by mass or less (excluding 0% by mass)) Zn is a component commonly found in die-cast alloy scrap and cast alloy scrap. For example, the Zn content in ADC12 material specified in JIS H 5302:2006 for aluminum alloy die casting is 1.0 mass% or less. If the Zn content in the aluminum alloy exceeds 1.0 mass%, the pitting potential becomes negative, and the corrosion rate increases. Therefore, the Zn content in the aluminum alloy should be 1.0 mass% or less, preferably 0.8 mass% or less, and more preferably 0.6 mass% or less, relative to the total mass of the aluminum alloy. However, this excludes the case where the Zn content in the aluminum alloy is 0 mass%.

[0033] (Ti: 0.02 mass% or more and 0.13 mass% or less) Ti promotes the formation of primary Al crystals, thereby finely dispersing the crystal grains before homogenization. Furthermore, even after homogenization, Ti has the effect of refining the crystal grains due to the influence of the crystal grains before homogenization. In addition, since Ti also has the effect of preventing the localization of eutectic structures, it simultaneously has a compound dispersion effect after homogenization. If the Ti content in the aluminum alloy is less than 0.02% by mass, the effect of refining the crystal grains before and after homogenization treatment will be insufficient, making it prone to cracking. Therefore, the Ti content in the aluminum alloy should be 0.02% by mass or more, preferably 0.03% by mass or more, and more preferably 0.05% by mass or more, relative to the total mass of the aluminum alloy. On the other hand, if the Ti content in the aluminum alloy exceeds 0.13 mass%, Ti compounds form coarsely, making it prone to cracking during drawing. Therefore, the Ti content in the aluminum alloy should be 0.13 mass% or less, preferably 0.12 mass% or less, and more preferably 0.11 mass% or less, relative to the total mass of the aluminum alloy.

[0034] (B: 0.0001 mass% or more 0.0015 mass%) B is a component that may be found in general die-cast alloy scrap and cast alloy scrap. In this embodiment, the wrought material obtained by recycling die-cast alloy scrap and cast alloy scrap is assumed, and B is also contained in the aluminum alloy part. If the B content in the aluminum alloy portion is less than 0.0001% by mass, it is necessary to reduce the B content in die-cast alloy scrap or cast alloy scrap, or to reduce the amount of alloy scrap used for recycling. Therefore, the B content in the aluminum alloy portion should be 0.0001% by mass or more, preferably 0.00013% by mass or more, and more preferably 0.00015% by mass or more, relative to the total mass of the aluminum alloy portion. On the other hand, if the B content in the aluminum alloy exceeds 0.0015 mass%, the grain refinement effect due to the inclusion of Ti cannot be sufficiently obtained, making it more prone to cracking during drawing. Therefore, the B content in the aluminum alloy should be 0.0015 mass% or less, preferably 0.0007 mass% or less, and more preferably 0.0003 mass% or less, relative to the total mass of the aluminum alloy.

[0035] In this embodiment, in addition to the above-mentioned Si, Fe, Mn, Zn, Ti, and B, at least one element selected from Mg and Cu is included within a predetermined range. The reasons for limiting the content of Mg and Cu are explained below.

[0036] (Mg: 0.2 mass% or more and 0.8 mass% or less) Since Mg and Cu are elements that affect the strength and moldability of the wrought material, the wrought material according to this embodiment contains at least one element selected from Mg and Cu within the range shown below. If the Mg content in the aluminum alloy is less than 0.2% by mass, the strength of the wrought material may decrease. Therefore, when Mg is included in the aluminum alloy, the Mg content in the aluminum alloy should be 0.2% by mass or more, preferably 0.25% by mass or more, and more preferably 0.3% by mass or more, relative to the total mass of the aluminum alloy. On the other hand, if the Mg content in the aluminum alloy exceeds 0.8% by mass, the elongation may decrease and cracking may occur. Therefore, the Mg content in the aluminum alloy should be 0.8% by mass or less, preferably 0.7% by mass or less, and more preferably 0.6% by mass or less, relative to the total mass of the aluminum alloy.

[0037] (Cu: 1.0 mass% or more and 4.0 mass% or less) As described above, Mg and Cu are elements that affect the strength and moldability of the wrought material; therefore, the wrought material according to this embodiment contains at least one element selected from Mg and Cu within the range shown below. If the Cu content in the aluminum alloy is less than 1.0 mass%, the strength of the wrought material may decrease. Therefore, when Cu is included in the aluminum alloy, the Cu content in the aluminum alloy should be 1.0 mass or more, preferably 1.2 mass or more, and more preferably 1.3 mass or more, relative to the total mass of the aluminum alloy. On the other hand, if the Cu content in the aluminum alloy exceeds 4.0 mass%, the elongation may decrease and cracking may occur. Therefore, the Cu content in the aluminum alloy should be 4.0 mass% or less, preferably 3.8 mass% or less, and more preferably 3.5 mass% or less, relative to the total mass of the aluminum alloy.

[0038] As mentioned above, Mg and Cu are elements that affect the strength and formability of the wrought material, and in this embodiment they can be considered equivalent elements. Therefore, it is not necessarily required to include both Mg and Cu in the aluminum alloy part, and the desired effect can be achieved even if only one of Mg and Cu is included within the predetermined content ranges described above. Of course, both Mg and Cu may be included within the predetermined content ranges described above.

[0039] (Other elements) In the wrought aluminum alloy material according to this embodiment, the total amount of Al, Si, Fe, Mn, Zn, Ti, B, Mg, and Cu is preferably 98.5% by mass or more, more preferably 99% by mass or more, and even more preferably 99.5% by mass or more, based on the total mass of the wrought aluminum alloy material. Other elements besides those mentioned above include Cr, Zr, Ni, Sn, Sr, Sb, and Ca. These elements may be present in die-cast alloy scraps and cast alloy scraps, and therefore may also be present in aluminum alloy parts obtained using these alloy scraps. In this embodiment, the content of Cr, Zr, Ni, Sn, Pb, Sr, Sb, and Ca in the aluminum alloy part is not particularly limited, but for example, the Cr content is preferably 0.1% by mass or less, the Zr content is preferably 0.1% by mass or less, the Ni content is preferably 0.2% by mass or less, the Sn content is preferably 0.1% by mass or less, the Sr content is preferably 0.18% by mass or less, the Sb content is preferably 0.5% by mass or less, and the Ca content is preferably 0.1% by mass or less.

[0040] (Remainder: Al and inevitable impurities) In this embodiment, the remainder of the wrought aluminum alloy is Al and unavoidable impurities. Examples of unavoidable impurities include Na, P, and V. Preferably, the Na content in the aluminum alloy is 0.002% by mass or less relative to the total mass of the aluminum alloy. Preferably, the Al content in the aluminum alloy is 80% by mass or more relative to the total mass of the aluminum alloy, and the total amount of unavoidable impurities in the aluminum alloy is 0.15% by mass or less relative to the total mass of the aluminum alloy.

[0041] The wrought aluminum alloy material according to this embodiment may be composed of an aluminum alloy portion in part, or the entire wrought aluminum alloy material may be composed of an aluminum alloy portion. An example in which a portion of the wrought aluminum alloy material is composed of an aluminum alloy portion will be described.

[0042] The wrought aluminum alloy according to this embodiment may consist of a clad material having a core material and a cladding material laminated on at least a portion of the surface of the core material. Examples of the cladding material include sacrificial anode material. The components contained in the sacrificial anode material, which is an example of the core material and cladding material included in the wrought aluminum alloy, and the reasons for limiting their content will be explained below.

[0043] <Heartwood> The core material consists of the aluminum alloy portion described above. Therefore, the reason for limiting the amount of each component contained in the core material is as described in the aluminum alloy portion above.

[0044] <Sacrificial anode material> (Zn: 0.50 mass% or more and 6.00 mass% or less) Zn in sacrificial anode material is an element that lowers the potential of the base material and enhances the sacrificial corrosion protection effect on the core material, thereby preventing pitting and crevice corrosion. If the Zn content in the sacrificial anode material is 0.50% by mass or more, a sufficient sacrificial corrosion protection effect can be obtained. Therefore, the Zn content in the sacrificial anode material is preferably 0.50% by mass or more, more preferably 0.60% by mass or more, and even more preferably 0.70% by mass or more, relative to the total mass of the sacrificial anode material. Furthermore, if the Zn content in the sacrificial anode material is 6.00% by mass or less, it is possible to prevent the self-corrosiveness of the sacrificial anode material from increasing excessively, thereby suppressing a decrease in the corrosion resistance of the wrought aluminum alloy. Therefore, the Zn content in the sacrificial anode material is preferably 6.00% by mass or less, more preferably 5.70% by mass or less, and even more preferably 5.50% by mass or less, relative to the total mass of the sacrificial anode material.

[0045] (Si: 0.05 mass% or more and 1.50 mass% or less) Si in the sacrificial anode material is an element that has the effect of improving the strength of the sacrificial anode material. If the Si content in the sacrificial anode material is 0.05% by mass or more, an effect of improving strength can be obtained. Therefore, the Si content in the sacrificial anode material is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and even more preferably 0.15% by mass or more, relative to the total mass of the sacrificial anode material. Furthermore, if the Si content in the sacrificial anode material is 1.50% by mass or less, the formation of Si-based compounds and Si particles can be suppressed, preventing a decrease in corrosion resistance. Therefore, the Si content in the sacrificial anode material is preferably 1.50% by mass or less, more preferably 1.45% by mass or less, and even more preferably 1.40% by mass or less, relative to the total mass of the sacrificial anode material.

[0046] (Fe: 0.05 mass% or more and 2.00 mass% or less) Fe in sacrificial anode material forms Al-Fe-Mn-Si compounds with Si and Mn, and is an element that improves strength through dispersion strengthening. If the Fe content in the sacrificial anode material is 0.05% by mass or more, an effect of improving strength can be obtained. Therefore, the Fe content in the sacrificial anode material is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and even more preferably 0.12% by mass or more, relative to the total mass of the sacrificial anode material. Furthermore, if the Fe content in the sacrificial anode material is 2.00% by mass or less, the formation of large intermetallic compounds during casting can be prevented, and a decrease in plasticity can be suppressed. Therefore, the Fe content in the sacrificial anode material is preferably 2.00% by mass or less, more preferably 1.80% by mass or less, and even more preferably 1.60% by mass or less, relative to the total mass of the sacrificial anode material.

[0047] (Mg: 3.00% by mass or less) The Mg in the sacrificial anode material is an element that improves the strength of the sacrificial anode material itself by precipitating Mg2Si. However, in this embodiment, the Mg content in the sacrificial anode material may be 0% by mass. Furthermore, if the Mg content in the sacrificial anode material is 3.00% by mass or less, it can be easily pressed together during hot cladding rolling. Therefore, the Mg content in the sacrificial anode material is preferably 3.00% by mass or less, more preferably 2.80% by mass or less, and even more preferably 2.60% by mass or less, relative to the total mass of the sacrificial anode material.

[0048] (Mn: 1.80% by mass or less) Mn in the sacrificial anode material is an element that improves strength by solid-solubilizing in the base material or by forming an Al-Mn-Si intermetallic compound with Si. However, in this embodiment, the Mn content in the sacrificial anode material may be 0% by mass. Furthermore, if the Mn content in the sacrificial anode material is 1.80% by mass or less, it is possible to prevent the formation of large intermetallic compounds during casting and suppress the decrease in plasticity. Therefore, the Mn content in the sacrificial anode material is preferably 1.80% by mass or less, more preferably 1.60% by mass or less, and even more preferably 1.40% by mass or less, relative to the total mass of the sacrificial anode material.

[0049] (Cu: 0.50% by mass or less) When the Cu content in the sacrificial anode material is 0.50% by mass or less, the pitting potential of the sacrificial anode material does not become nobler, and the effect of sacrificial corrosion protection can be fully obtained. Therefore, the Cu content in the sacrificial anode material is preferably 0.50% by mass or less, more preferably 0.40% by mass or less, and even more preferably 0.30% by mass or less, relative to the total mass of the sacrificial anode material.

[0050] (Cr: 0.30 mass% or less) Cr in the sacrificial anode material is an element that has the effect of improving strength through solid solution strengthening, but in this embodiment, the Cr content in the sacrificial anode material may be 0% by mass. Furthermore, if the Cr content in the sacrificial anode material is 0.30% by mass or less, it is possible to prevent the formation of large intermetallic compounds during casting and suppress the decrease in plasticity. Therefore, the Cr content in the sacrificial anode material is preferably 0.30% by mass or less, more preferably 0.20% by mass or less, and even more preferably 0.10% by mass or less, relative to the total mass of the sacrificial anode material.

[0051] (Ti: 0.30% by mass or less) Ti in the sacrificial anode material is an element that has the effect of improving strength through solid solution strengthening, but in this embodiment, the Ti content in the sacrificial anode material may be 0% by mass. Furthermore, if the Ti content in the sacrificial anode material is 0.30 mass% or less, the formation of large intermetallic compounds during casting can be prevented, and a decrease in plasticity can be suppressed. Therefore, the Ti content in the sacrificial anode material is preferably 0.30 mass% or less, more preferably 0.20 mass% or less, and even more preferably 0.10 mass% or less, relative to the total mass of the sacrificial anode material.

[0052] (Zr: 0.30% by mass or less) Zr in the sacrificial anode material is an element that has the effect of improving strength through solid solution strengthening, but in this embodiment, the Zr content in the sacrificial anode material may be 0% by mass. Furthermore, if the Zr content in the sacrificial anode material is 0.30% by mass or less, the formation of large intermetallic compounds during casting can be prevented, and a decrease in plasticity can be suppressed. Therefore, the Zr content in the sacrificial anode material is preferably 0.30% by mass or less, more preferably 0.20% by mass or less, and even more preferably 0.10% by mass or less, relative to the total mass of the sacrificial anode material.

[0053] (V: 0.30% by mass or less) V in the sacrificial anode material is an element that has the effect of improving strength through solid solution strengthening, but in this embodiment, the V content in the sacrificial anode material may be 0% by mass. Furthermore, if the V content in the sacrificial anode material is 0.30% by mass or less, it is possible to prevent the formation of large intermetallic compounds during casting and suppress the decrease in plasticity. Therefore, the V content in the sacrificial anode material is preferably 0.30% by mass or less, more preferably 0.20% by mass or less, and even more preferably 0.10% by mass or less, relative to the total mass of the sacrificial anode material.

[0054] (Remainder: Al and inevitable impurities) The remainder of the sacrificial anode material contained in the wrought aluminum alloy is Al and unavoidable impurities. Examples of unavoidable impurities include Ca, Be, Sb, rare earth elements, and Li. Specifically, Ca may be present in amounts of 0.05% by mass or less, Be in amounts of 0.01% by mass or less, and other elements in amounts of less than 0.01% by mass. Furthermore, it is preferable that the total amount of unavoidable impurities in the sacrificial anode material is 0.05% by mass or less relative to the total mass of the sacrificial anode material.

[0055] <Forms of wrought aluminum alloy> In this embodiment, the form of the wrought aluminum alloy is not particularly limited. As described above, it may be a plate-shaped wrought aluminum alloy consisting only of an aluminum alloy portion, or it may be a form in which a plate-shaped core and a plate-shaped cladding material are laminated together. When laminated, the cladding material may be laminated only on a part of the surface of the core, or the cladding material may be laminated on the entire surface of one or both surfaces. It may also be a clad material obtained by extrusion, for example, the cladding material may be laminated on at least one of the inner and outer surfaces of a hollow extruded material, or on the outer surface of a solid extruded material. In this embodiment, "wrought material" includes both "rolled material" and "extruded material," but does not include "forged material." Therefore, the present invention applies to wrought aluminum alloys, rolled aluminum alloys, and extruded aluminum alloys, excluding forged material.

[0056] [Manufacturing method for wrought aluminum alloy] The method for manufacturing the wrought aluminum alloy according to this embodiment comprises a melting and casting step and a drawing step. These steps will be described in detail below.

[0057] [Melting and casting process] The melting and casting process involves melting casting raw material A and additive casting raw material B to cast an ingot. Casting raw material A is at least one alloy scrap selected from die-cast alloy scraps and cast alloy scraps, and casting raw material B is an additive raw material used to adjust the composition of the ingot. Examples of casting raw material A include ADC12 material and ADC14 material specified in JIS H 5302:2006 for aluminum alloy die castings, AC4C material specified in JIS H 5202:2010 for aluminum alloy castings, and materials equivalent to the composition of AlSi17Cu4Mg specified in ISO 3522. However, in this embodiment, the composition of casting raw material A is not limited to the above, and any raw material can be used as long as it is at least one alloy scrap selected from die-cast alloy scraps and cast alloy scraps and falls within the range of compositions described later.

[0058] Here, the content of the constituent components and the reasons for its limitation are explained below regarding the casting raw material A used in the melting and casting process described above. In this specification, "at least one alloy scrap selected from die-cast alloy scrap and casting alloy scrap" may be simply referred to as "alloy scrap."

[0059] <Casting raw material A> (Si: 5.0 mass% or more and 18.0 mass% or less) Si is an element that promotes crack formation during drawing because it has a large grain size and readily forms Si compounds. Si is an element commonly found in alloy scrap. For example, the Si content in the ADC12 material is 9.6 to 12.0 mass%, and the Si content in the ADC14 material is 16.0 to 18.0 mass%. In this embodiment, the grain size can be refined and the compounds can be refined and dispersed by the elements described later. Therefore, even if the Si content in the casting raw material A is high, it is possible to suppress crack formation during drawing while maintaining a high recycling rate.

[0060] In this embodiment, the objective is to obtain a method for manufacturing a wrought aluminum alloy that can suppress the occurrence of cracks even when using a casting raw material A with a high Si content, without using any special equipment. In other words, this embodiment assumes the use of a casting raw material with a high Si content. When the Si content in the casting raw material A is less than 5.0 mass%, cracks are less likely to occur during wrought, and it is not necessary to strictly control the composition of the ingot. Therefore, the Si content in the casting raw material A is preferably 5.0 mass or more, more preferably 5.5 mass or more, and more preferably 6.0 mass or more, relative to the total mass of the casting raw material A.

[0061] On the other hand, if the Si content in casting raw material A exceeds 18.0% by mass, depending on the recycling rate, it may become difficult to refine the grain size, and cracking may occur during drawing. Furthermore, the upper limit for Si content in die-cast materials and castings specified in the above JIS and ISO standards is 18.0% by mass. Therefore, the Si content in casting raw material A should be 18.0% by mass or less, preferably 15.0% by mass or less, and more preferably 13.0% by mass or less, relative to the total mass of casting raw material A.

[0062] (Fe: 1.3% by mass or less) Fe is an element that readily forms compounds and promotes crack formation during wrought. Furthermore, since Fe is an element commonly found in alloy scrap, there is no particular limit to the Fe content in casting raw material A. On the other hand, for example, the Fe content in the above ADC12 material is 1.3 mass% or less. If the Fe content in casting raw material A is 1.3 mass% or less, an aluminum alloy wrought material with the desired Fe content can be obtained regardless of the recycling rate. Therefore, the Fe content in casting raw material A should be 1.3 mass% or less, preferably 1.1 mass% or less, and more preferably 1.0 mass% or less, relative to the total mass of casting raw material A.

[0063] (Mn: 1.0% by mass or less) Since Mn is a component commonly found in alloy scrap, there is no particular limit to the lower limit of the Mn content in casting raw material A. On the other hand, for example, the upper limit of the Mn content in the above AC4C material is 0.6 mass%. However, even if the Mn content in casting raw material A exceeds the upper limit specified in JIS, etc., cracking can be suppressed as long as the Mn content in the wrought aluminum alloy is within the desired range. If the Mn content in casting raw material A exceeds 1.0 mass%, cracking is more likely to occur during the subsequent drawing process. Therefore, the Mn content in casting raw material A should be 1.0 mass% or less, preferably 0.8 mass% or less, and more preferably 0.6 mass% or less, relative to the total mass of casting raw material A.

[0064] (Zn: 1.5% by mass or less) Since Zn is a component commonly found in alloy scrap, there is no particular limit to the lower limit of the Mn content in the casting raw material A. On the other hand, for example, the upper limit of the Zn content in the above ADC12 material is 1.0 mass%. However, even if the Zn content in the casting raw material A exceeds the upper limit specified in JIS, etc., cracking can be suppressed as long as the Zn content in the wrought aluminum alloy is within the desired range. If the Zn content in the casting raw material A exceeds 1.5 mass%, cracking is more likely to occur during the subsequent drawing process. Therefore, the Zn content in the casting raw material A should be 1.5 mass% or less, preferably 0.8 mass% or less, and more preferably 0.6 mass% or less, relative to the total mass of the casting raw material A.

[0065] In this embodiment, the casting raw material A contains, in addition to the above-mentioned Si, Fe, Mn, and Zn, at least one element selected from Mg and Cu within a predetermined range. The reasons for limiting the content of Mg and Cu are explained below.

[0066] (Mg: 0.2 mass% or more and 1.0 mass% or less) At least one of Mg and Cu is a component that is likely to be contained in general alloy scrap. For example, the Mg content in the above ADC14 material is 0.45% by mass or more and 0.65% by mass or less. If the Mg content in casting raw material A is less than 0.2% by mass, the strength of the wrought material obtained after drawing may decrease. Therefore, when Mg is included in casting raw material A, the Mg content in casting raw material A should be 0.2% by mass or more, preferably 0.25% by mass or more, and more preferably 0.35% by mass or more, relative to the total mass of casting raw material A. On the other hand, if the Mg content in casting raw material A exceeds 1.0% by mass, the elongation may decrease during the subsequent drawing process, which can lead to cracking. Therefore, the Mg content in casting raw material A should be 1.0% by mass or less, preferably 0.9% by mass or less, and more preferably 0.8% by mass or less, relative to the total mass of casting raw material A.

[0067] (Cu: 1.0 mass% or more and 5.0 mass% or less) At least one of Cu and Mg is a component that is likely to be contained in common alloy scrap. For example, the Cu content in the above ADC14 material is 4.0% by mass or more and 5.0% by mass or less. If the Cu content in casting raw material A is less than 1.0% by mass, the strength of the wrought material obtained after drawing may decrease. Therefore, when Cu is included in casting raw material A, the Cu content in casting raw material A should be 1.0% by mass or more, preferably 1.2% by mass or more, and more preferably 1.3% by mass or more, relative to the total mass of casting raw material A. On the other hand, if the Cu content in casting raw material A exceeds 5.0% by mass, the elongation may decrease during the subsequent drawing process, which can lead to cracking. Therefore, the Cu content in casting raw material A should be 5.0% by mass or less, preferably 4.5% by mass or less, and more preferably 4.0% by mass or less, relative to the total mass of casting raw material A.

[0068] As described above, the casting raw material A consists of at least one type of aluminum alloy scrap selected from die-cast alloy scrap and cast alloy scrap, and the remainder of the elements in the casting raw material A is Al and impurities, etc. The Al content in the casting raw material A is preferably 75% by mass or more, and more preferably 80% by mass or more, based on the total mass of the casting raw material A. In addition to Al, Si, Fe, Mn, Zn, Mg, and Cu, various components commonly found in alloy scrap may be included in the resulting ingot (aluminum alloy portion), as long as the components and their content are within the range specified in this embodiment.

[0069] [Stretching process] The method for manufacturing a wrought aluminum alloy according to this embodiment includes a drawing step in which the obtained ingot is drawn after the melting and casting step described above. In this embodiment, since the content of each component contained in the aluminum alloy portion formed by the ingot is appropriately controlled, it is possible to manufacture a wrought aluminum alloy with suppressed cracking. The reasons for the numerical limitations on each component contained in the aluminum alloy portion and their content are as described above.

[0070] [Homogenization process] The method for manufacturing the wrought aluminum alloy according to this embodiment may include a homogenization step between the melting and casting step and the wrought step, in which the ingot is homogenized to obtain a homogenized material.

[0071] (Recycling rate: 60% or more) The recycling rate R is the percentage of the mass of the casting raw material A relative to the total mass of the ingot. In conventional methods for manufacturing wrought aluminum alloys, using alloy scrap with a high Si content makes cracking more likely, requiring equipment to separate components that negatively affect the wrought material, or processing to reduce the content of these negatively affecting components by lowering the recycling rate. In this embodiment, even when alloy scrap with a high Si content is used as the casting raw material A, the grain size is refined by controlling the Ti and B content, thereby suppressing the occurrence of cracking. Therefore, special equipment is not required, the amount of metal used for dilution can be reduced, the manufacturing cost of wrought aluminum alloys can be reduced, and CO2 emissions during manufacturing can be significantly reduced.

[0072] If the recycling rate is 60% or higher, a sufficient amount of alloy scrap can be used to obtain wrought material, thereby achieving a substantial reduction in manufacturing costs and CO2 emissions. Therefore, a recycling rate of 60% or higher is preferable, 75% or higher is more preferable, and 90% or higher is even more preferable.

[0073] <Casting raw material B> Furthermore, a brief explanation of casting raw material B will be provided. Casting raw material B is a raw material added to adjust the content of each element in the manufactured aluminum alloy to the desired level. Therefore, the elements contained in casting raw material B and their content are not particularly limited. In other words, in this embodiment, the recycling rate should be determined and the composition of casting raw material B should be determined so that the content of each component contained in the aluminum alloy falls within a predetermined range. For example, if the composition of the alloy scrap used in the manufacture of the wrought aluminum alloy is close to the composition of casting raw material A as defined in this embodiment, the recycling rate can be brought close to 100%. Note that since Si and Fe are elements that promote cracking, it is preferable that casting raw material B does not contain Si, and it is also preferable that it does not contain Fe.

[0074] As described above, the form of the wrought aluminum alloy manufactured by this embodiment is not particularly limited. The manufacturing method for the case in which the wrought aluminum alloy is a clad material comprising a core material composed of the above-mentioned aluminum alloy part and a cladding material combined on at least a part of the surface of the core material will be described below with reference to the first to fourth embodiments.

[0075] [First Embodiment] Figure 1 is a flowchart illustrating a method for manufacturing a wrought aluminum alloy according to the first embodiment of the present invention. The method for manufacturing a wrought aluminum alloy according to the first embodiment will be described with reference to Figure 1.

[0076] [Manufacturing of ingots for core materials] <Melting and Casting Process> (S11: Melting process of casting raw materials for core material) First, in the melting process S11 for the core casting material, casting material A and casting material B for additives are melted. Casting material A and casting material B are as described above.

[0077] (Casting process S12 for the core material ingot) Next, the core ingot is cast. Specifically, the molten metal obtained by melting casting raw material A and casting raw material B is poured into a mold and cooled to obtain the core ingot. In this embodiment, the core ingot is the ingot for obtaining the above-mentioned <aluminum alloy part>, and its composition is as described above.

[0078] <Homogenization process> (Homogeneity treatment process for ingots for core material S13) Subsequently, the core material ingot is subjected to a homogenization treatment to obtain the core material ingot after the homogenization treatment (homogeneized core material).

[0079] [Manufacturing of ingots for leather materials] <Casting process for ingots used for leather materials> (S21: Melting process for casting raw materials for leather) In addition to the above-mentioned process for manufacturing the core ingot, an ingot for the outer layer is manufactured. First, in the melting process S21 for the outer layer casting raw material, the outer layer casting raw material C is melted. The composition of the outer layer casting raw material C is not particularly limited, but if a sacrificial anode material is to be manufactured as the outer layer, for example, the material for the sacrificial anode material can be used as the outer layer casting raw material C.

[0080] (Casting process for ingots for leather materials S22) Next, the ingot for the leather material is cast. Specifically, the molten metal, obtained by melting the raw material C for the leather material, is poured into a mold and cooled to obtain the ingot for the leather material.

[0081] <Homogenization process> (Homogeneity treatment process for ingots for leather material S23) Subsequently, the ingot for the outer layer is subjected to a homogenization treatment to obtain the ingot for the outer layer after the homogenization treatment (homogenized material for the outer layer).

[0082] [Stretching process] (Combination process S31) In the combination process S31, the core material ingot after homogenization treatment and the outer material ingot after homogenization treatment are combined to produce a combined material. As for the method of combination, for example, the outer material ingot may be placed on part or all of one main surface of the core material ingot, or the outer material ingot may be placed on part or all of both main surfaces.

[0083] (Combined material stretching process S32) Subsequently, the combined material is drawn. This makes it possible to produce a wrought aluminum alloy material consisting of a core material and a clad material that includes a skin material combined with at least a portion of the surface of the core material.

[0084] [Second Embodiment] Figure 2 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to a second embodiment of the present invention. The method for manufacturing a wrought aluminum alloy according to the second embodiment will be described with reference to Figure 2.

[0085] [Manufacturing of ingots for core materials] The melting process S11 for the core casting material, the casting process S12 for the core casting ingot, and the homogenization process S13 for the core casting ingot are the same as in the first embodiment described above, and therefore will not be explained in the second embodiment.

[0086] [Stretching process] (Core material manufacturing process S14) The ingot for the core material after the homogenization process S13 described above is rolled out to produce the core material.

[0087] [Manufacturing of ingots for leather materials] The melting process S21 for the raw material for the leather, the casting process S22 for the ingot for the leather, and the homogenization process S23 for the ingot for the leather are the same as in the first embodiment described above, so their explanation will be omitted in the second embodiment.

[0088] (Leather material manufacturing process S24) The leather material is produced by slicing or stretching the ingot for the leather material after the homogenization process S23 described above. In the second embodiment, the melting process S21 of the raw material for the leather material, the casting process S22 of the ingot for the leather material, the homogenization process S23 of the ingot for the leather material, and the leather material production process S24 may be carried out before or after the production of the ingot for the core material, and pre-produced ingots for the leather material or leather material may be used. Furthermore, in the leather material production process, either slicing or stretching the ingot for the leather material, or both, can be used as a method for producing leather material of a desired thickness.

[0089] (Combination process S41) In the combination process S41, the core material produced in the core material production process S14 and the leather material produced in the leather material production process S24 are combined to produce a combined material. The method of combination is the same as in the first embodiment described above.

[0090] (Expansion process of composite material S42) Subsequently, the combined material produced in the above combination process is drawn. This makes it possible to produce a wrought aluminum alloy material consisting of a core material and a clad material that includes a shell material combined on at least a portion of the surface of the core material.

[0091] [Third Embodiment] Figure 3 is a flowchart illustrating a method for manufacturing a wrought aluminum alloy according to the third embodiment of the present invention. The method for manufacturing a wrought aluminum alloy according to the third embodiment will be described with reference to Figure 3.

[0092] [Manufacturing of ingots for core materials] The melting process S11 for the core casting material, the casting process S12 for the core casting ingot, and the homogenization process S13 for the core casting ingot are the same as in the first embodiment described above, and therefore will not be explained in the third embodiment.

[0093] [Manufacturing of ingots for leather materials] The melting process S21 for the raw material for the leather, the casting process S22 for the ingot for the leather, the homogenization process S23 for the ingot for the leather, and the leather material manufacturing process S24 are the same as in the second embodiment described above, so their explanation is omitted in the third embodiment.

[0094] [Stretching process] (Assembly process S51) In the combination process S51, the core material ingot after the homogenization treatment and the outer material produced in the outer material production process S24 are combined to produce a combined material. The method of combination is the same as in the first embodiment described above.

[0095] (Expansion process of composite material S52) Subsequently, the combined material produced in the above combination step S51 is drawn. This makes it possible to produce a wrought aluminum alloy material consisting of a core material and a clad material including a skin material combined on at least a portion of the surface of the core material.

[0096] [Fourth Embodiment] Figure 4 is a flowchart showing a method for manufacturing a wrought aluminum alloy according to the fourth embodiment of the present invention. The method for manufacturing a wrought aluminum alloy according to the fourth embodiment will be described with reference to Figure 4.

[0097] [Manufacturing of ingots for core materials] The process of melting the casting raw material for the core material S11, casting the ingot for the core material S12, homogenizing the ingot for the core material S13, and preparing the core material S14 are the same as in the second embodiment described above, so their explanation is omitted in the fourth embodiment.

[0098] [Manufacturing of ingots for leather materials] The melting process S21 for the raw material for the leather, the casting process S22 for the ingot for the leather, and the homogenization process S23 for the ingot for the leather are the same as in the first embodiment described above, so their explanation is omitted in the fourth embodiment.

[0099] [Stretching process] (Combination process S61) In the combination process S61, the core material produced in the core material production process S14 and the ingot for the outer material after the homogenization process S23 are combined to produce a combined material. The method of combination is the same as in the first embodiment described above.

[0100] (Expansion process of composite material S62) Subsequently, the combined material produced in the above combination step S61 is drawn. This makes it possible to produce a wrought aluminum alloy material consisting of a core material and a clad material including a shell material combined on at least a portion of the surface of the core material.

[0101] In this invention, the conditions for casting and homogenizing the core material ingot and the outer material ingot are not particularly limited, and general conditions can be applied. Furthermore, as a method of drawing, for example, rolling can be used, and the conditions for this can be set as appropriate.

[0102] Figure 5 is a schematic cross-sectional view showing another example of the shape of an aluminum alloy wrought material manufactured by the manufacturing method according to an embodiment of the present invention. The aluminum alloy wrought material 5 shown in Figure 5 is a clad material obtained by extrusion, and is, for example, a clad material in which an inner surface material 7 is laminated on the inner surface of a hollow core material 6, and an outer surface material 8 is laminated on the outer surface. Note that the surface material may be laminated on at least one of the inner and outer surfaces, or the surface material may be laminated on the outer surface of a solid extruded material.

[0103] The above-mentioned outer material can be a functional alloy material having a specific function, in addition to the sacrificial anode material. The function and composition of the functional alloy material are not limited. The reason for limiting the numerical values ​​of the components and their content contained in the sacrificial anode material is as described above. [Examples]

[0104] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples, and can be implemented with modifications within the scope that is consistent with the spirit of the present invention, and all such modifications are included within the technical scope of the present invention.

[0105] <Manufacturing of wrought aluminum alloys> Assuming that alloy scrap (casting raw material A) having the chemical composition shown in Table 1 below and additive casting raw materials B having various chemical compositions shown in Table 2 below were used, the aluminum alloy raw material was melted at a temperature of 730°C. Subsequently, by casting this at a temperature of 700°C, an ingot with a thickness of 50 mm, a width of 145 mm, and a length of 250 mm was produced.

[0106] Next, the obtained ingot was subjected to a homogenization treatment at a temperature of 510°C for 4 hours to obtain a homogenized material. Subsequently, the homogenized material was subjected to hot rolling. In the hot rolling process, the homogenized material, with its height of 45 mm, width of 145 mm, and length of 100 mm after removing the non-uniform layer, was hot-rolled until it had a thickness of 2.5 mm and a length of approximately 1.8 m. The starting temperature for hot rolling was 480°C. That is, the homogenized material after the homogenization treatment was removed from the furnace, slowly cooled to 480°C, and then hot rolling was started to obtain a rolled material (aluminum alloy wrought material) of the above size consisting of the aluminum alloy portion. The content of each component in the obtained aluminum alloy wrought material is shown in Table 1 below.

[0107] <Evaluation of wrought aluminum alloy materials> (Evaluation of cracks) Figure 6 is a schematic diagram showing a method for evaluating cracks in the obtained wrought aluminum alloy. As shown in Figure 6, the wrought aluminum alloy 1 is rolled along its longitudinal direction. Furthermore, n cracks 2 are generated inward from the side surface 1a parallel to the rolling direction. In this embodiment, the length of each crack 2 in the direction perpendicular to the rolling direction is defined as the crack length x1 to x n The average value of the crack length Xa was calculated using the following formula 1, with the value set to (mm).

[0108]

number

[0109] In this embodiment, wrought materials with an average crack length Xa of 23.0 mm or less were judged to have a high crack suppression effect and were deemed good. On the other hand, wrought materials with an average crack length Xa exceeding 23.0 mm were judged to have a low crack suppression effect and were deemed poor. The calculated average crack length Xa is also shown in Table 1 below.

[0110] In Table 1, in the column for the content of each component, "-" indicates that the element is not present or its content is below the detection limit. Furthermore, the remainder of each component in the wrought aluminum alloy shown in Table 1 consists of Al and unavoidable impurities.

[0111] [Table 1]

[0112] [Table 2]

[0113] [Table 3]

[0114] <Evaluation results of wrought aluminum alloy materials> As shown in Table 1 above, in Invention Examples No. 1 and 2, the content of components contained in the casting raw material A and the components contained in the obtained wrought aluminum alloy (aluminum alloy part) are within the range defined in the present invention, so the grain size can be refined and crack occurrence can be suppressed.

[0115] On the other hand, in Comparative Examples No. 1 to 10, either or both of Ti and B were outside the range defined in the present invention, and therefore the crack suppression effect could not be obtained.

[0116] As these results demonstrate, wrought aluminum alloys in which the content of each component is controlled within the range defined in this invention can suppress cracking even with high Si content. Therefore, die-cast alloy scraps and cast alloy scraps can be used as raw materials with a high recycling rate. Furthermore, since there is no need to use special dilution equipment during recycling and the amount of base metal used can be reduced, CO2 emissions can be reduced.

[0117] 1,5 Aluminum alloy wrought material 2. Cracks 6 Heartwood 7. Inner leather material 8 External skin material S11,S21 Melting process S12, S22 Casting Process S13, S23 Homogenization process S14 Heartwood expansion process S24 Leather stretching process S31, S41 Combination Process

Claims

1. With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001% by mass or more and 0.0015% by mass or less, It contains, Mg: 0.2% by mass or more and 0.8% by mass or less, Cu: Contains in the range of 1.3% by mass or more and 4.0% by mass or less. Cr: 0.1% by mass or less, Zr: 0.1% by mass or less, Ni: 0.2% by mass or less, Sn: 0.1% by mass or less, Sr: 0.18% by mass or less, Sb: 0.5% by mass or less, Ca: 0.1% by mass or less, The remainder is an aluminum alloy wrought material characterized by having Al and an aluminum alloy portion which is an unavoidable impurity (however, the said aluminum alloy wrought material excludes forged materials).

2. The core material consists of the aforementioned aluminum alloy part, The wrought aluminum alloy material according to claim 1, characterized in that it comprises a clad material having a skin material laminated on at least a portion of the surface of the core material.

3. The aforementioned leather material is Zn: 0.50% by mass or more and 6.00% by mass or less, Si: 0.05% by mass or more and 1.50% by mass or less, Fe: Contains 0.05% by mass or more and 2.00% by mass or less, Mg: 3.00% by mass or less, Mn: 1.80% by mass or less, Cu: 0.50% by mass or less, Cr: 0.30% by mass or less, Ti: 0.30% by mass or less, Zr: 0.30% by mass or less, The wrought aluminum alloy material according to claim 2, characterized in that V is 0.30 mass% or less, and the remainder is Al and unavoidable impurities, forming a sacrificial anode material.

4. A method for manufacturing a wrought aluminum alloy according to any one of claims 1 to 3, A casting process in which at least one alloy scrap selected from die-cast alloy scraps and cast alloy scraps is used as the casting raw material A, and the casting raw material A and an additive casting raw material B are melted to cast an ingot, The process includes a stretching step for stretching the ingot, The aforementioned casting raw material A is It contains Si: 5.0% by mass or more and 18.0% by mass or less, Fe: 1.3% by mass or less, Mn: 1.0% by mass or less, Zn: 1.5% by mass or less, At least one selected from Mg and Cu, Mg: 0.2% by mass or more and 1.0% by mass or less, Cu: Contains in the range of 1.0% by mass or more and 5.0% by mass or less. A method for manufacturing a wrought aluminum alloy, characterized in that the aluminum alloy portion is composed of the ingot.

5. A method for manufacturing an aluminum alloy wrought product according to claim 4, characterized in that the recycling rate, which represents the ratio of the mass of the casting raw material A to the total mass of the ingot, is 60% or more.

6. The aluminum alloy wrought material is a clad material comprising a core material composed of the aluminum alloy portion and a cladding material combined on at least a part of the surface of the core material, Prior to the aforementioned stretching process, there is a process of casting an ingot for leather material in which the raw material C for leather material is melted and an ingot for leather material is cast. A method for manufacturing a wrought aluminum alloy according to claim 4, characterized in that, in the drawing step, a combined material consisting of the ingot for the core material and the ingot for the outer material is drawn.

7. The aluminum alloy wrought material is a clad material comprising a core material composed of the aluminum alloy portion and a cladding material combined on at least a part of the surface of the core material, A process for casting ingots for leather materials, in which raw material C for leather materials is melted and ingots for leather materials are cast, The process includes a leather material manufacturing step of producing a leather material by a method of stretching the ingot for leather material or by a method of slicing the ingot for leather material, A method for manufacturing a wrought aluminum alloy according to claim 4, characterized in that in the drawing step, a combined material consisting of the ingot for the core material and the outer material is drawn.

8. With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001% by mass or more and 0.0015% by mass or less, It contains, Mg: 0.2% by mass or more and 0.8% by mass or less, Cu: Contains in the range of 1.3% by mass or more and 4.0% by mass or less. Cr: 0.1% by mass or less, Zr: 0.1% by mass or less, Ni: 0.2% by mass or less, Sn: 0.1% by mass or less, Sr: 0.18% by mass or less, Sb: 0.5% by mass or less, Ca: 0.1% by mass or less, The remainder is an aluminum alloy rolled material characterized by having Al and an aluminum alloy portion which is an unavoidable impurity.

9. With respect to the total mass of the aluminum alloy part, Si: 4.0% by mass or more and 13.0% by mass or less, Fe: 1.1% by mass or less (excluding 0% by mass), Mn: 1.0% by mass or less (excluding 0% by mass), Zn: 1.0% by mass or less (excluding 0% by mass), Ti: 0.02% by mass or more and 0.13% by mass or less, and B: 0.0001% by mass or more and 0.0015% by mass or less, It contains, Mg: 0.2% by mass or more and 0.8% by mass or less, Cu: Contains in the range of 1.3% by mass or more and 4.0% by mass or less. Cr: 0.1% by mass or less, Zr: 0.1% by mass or less, Ni: 0.2% by mass or less, Sn: 0.1% by mass or less, Sr: 0.18% by mass or less, Sb: 0.5% by mass or less, Ca: 0.1% by mass or less, The remainder is an aluminum alloy extruded material characterized by having Al and an aluminum alloy portion which is an unavoidable impurity.

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