WO2022264959A1 - アルミニウム合金押出材及びその製造方法 - Google Patents

アルミニウム合金押出材及びその製造方法 Download PDF

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WO2022264959A1
WO2022264959A1 PCT/JP2022/023598 JP2022023598W WO2022264959A1 WO 2022264959 A1 WO2022264959 A1 WO 2022264959A1 JP 2022023598 W JP2022023598 W JP 2022023598W WO 2022264959 A1 WO2022264959 A1 WO 2022264959A1
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mass
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extruded material
aluminum alloy
extrusion
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English (en)
French (fr)
Japanese (ja)
Inventor
匠 丸山
嘉公 大橋
娟 項
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Resonac Holdings Corp
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Showa Denko KK
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Priority to JP2023529852A priority Critical patent/JP7439994B2/ja
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working

Definitions

  • the present invention relates to an aluminum alloy extruded material and a manufacturing method thereof.
  • Aluminum alloys are lightweight and strong, and in recent years, their applications have expanded to include transportation equipment such as automobiles and railway vehicles, civil engineering and construction fields, as well as household goods such as furniture and daily miscellaneous goods, and home appliances.
  • Aluminum alloy materials are required to be further lightened by thinning and the like, and for this reason, further improvement in strength is required as materials.
  • Patent Document 1 discloses a method for producing an aluminum-magnesium-silicon-based aluminum alloy extruded material, in which, in mass%, magnesium is 0.5 to 0.9%, silicon is 0.9 to 1.3%, iron 0.3 to 0.5%, titanium 0.005 to 0.1%, copper 0.4% or less, manganese 0.30% or less, chromium 0.10% or less, zirconium is limited to 0.10% or less, and the balance is aluminum and inevitable impurities.
  • Aluminum alloy is extruded and quenched by air cooling, then 2 to 5% of working strain is introduced, and then artificially aged. A method for manufacturing aluminum alloy extrusions is described.
  • Patent Document 2 Si: 0.70 to 1.3% (% by mass, the same applies hereinafter), Mg: 0.45 to 1.2%, Cu: 0.15 to less than 0.40%, Mn: 0 .10 to 0.40%, Cr: 0.06% or less (not including 0%), Zr: 0.05 to 0.20%, Ti: 0.005 to 0.15%, Fe: regulated to 0.30% or less, V: 0.01% or less, has a chemical composition consisting of the balance Al and unavoidable impurities, has a yield strength of 350 MPa or more, and has a crystallized particle size of 5 ⁇ m or less. and an aluminum alloy extruded material in which the area ratio of the fibrous structure in the cross section parallel to the hot extrusion direction is 95% or more.
  • Patent Document 3 Si: 0.8 to 2.0 mass%, Mg: 0.7 to 1.0 mass%, Cu: 0.3 to 1.0 mass%, Fe: ⁇ 0.20 mass% , Mn: 0.2 to 0.8% by mass, Cr: 0.1 to 0.4% by mass, Mn + Cr: 0.3 to 0.9% by mass, the balance being Al and unavoidable impurities, and further Mg and There is described an aluminum alloy extruded material for cutting, which has a composition in which the amount of Si satisfies the relational expression of Mg/1.73+0.2 ⁇ Si ⁇ Mg/1.73+1.6 and the metal structure is a fiber structure. ing.
  • Patent Document 1 the process of introducing processing distortion after quenching is incorporated, and the number of processes is larger than that of normal processes, which tends to lead to high costs.
  • Patent Document 2 it has a fibrous structure in the extrusion direction, and the mechanical properties in the direction perpendicular to the extrusion direction may be inferior to those in the direction parallel to the extrusion direction.
  • Patent Document 3 the extrusion moldability is insufficient, and in order to mold at a sufficient extrusion speed, it is necessary to increase the extrusion pressure, and the distortion of the extruded product tends to increase. Therefore, the cost tends to be high in order to maintain the quality as an extruded material.
  • an object of the present invention is to provide a low-cost aluminum alloy extruded material with high tensile strength and yield strength, and a method for manufacturing the same.
  • the configuration of the present invention for solving the above problems is as follows.
  • An aluminum alloy extruded material Si: 0.90% by mass or more and 2.00% by mass or less, Mg: 0.65% by mass or more and 0.90% by mass or less, Cu: 0.25% by mass or more and 0.50% by mass or less, Fe: 0.050% by mass or more and 0.49% by mass or less, Zr: 0.10% by mass or more and 0.25% by mass or less, Ti: 0.010% by mass or more and 0.10% by mass or less, B: 0.050 to 1.0 times the mass of Ti, and the balance consists of Al and inevitable impurities, In a cross section perpendicular to the extrusion direction, the area ratio of crystal grains having an aspect ratio of 5.0 or less and a length of 50 ⁇ m or more and 1000 ⁇ m or less in the major axis direction is 90.0% or more, An aluminum alloy extruded material having a surface electrical conductivity of 51.1 IACS% or less.
  • An aluminum alloy extruded material Si: 0.90% by mass or more and 2.00% by mass or less, Mg: 0.65% by mass or more and 0.90% by mass or less, Cu: 0.25% by mass or more and 0.50% by mass or less, Fe: 0.050% by mass or more and 0.49% by mass or less, Zr: 0.10% by mass or more and 0.25% by mass or less, Ti: 0.010% by mass or more and 0.10% by mass or less, B: 0.050 to 1.0 times the mass of Ti, and the balance consists of Al and inevitable impurities, In a cross section perpendicular to the extrusion direction, the area ratio of crystal grains having an aspect ratio of 5.0 or less and a length of 50 ⁇ m or more and 1000 ⁇ m or less in the major axis direction is 90.0% or more, In a cross section perpendicular to the extrusion direction, the existence density of Mg 2 Si particles having a particle size of 0.10 ⁇ m or more and 5.0 ⁇ m or
  • the existence density of Zr-containing fine particles having a particle size of 0.010 ⁇ m or more and 1.0 ⁇ m or less is 0.30 pieces/ ⁇ m 2 or more and 3.0 pieces/ ⁇ m 2 or less. 6.
  • the average crystal grain size at a depth position of t/10 from the outer surface of the extruded material is 60 ⁇ m or more and 120 ⁇ m or less with respect to the thickness t of the plate-like portion of the extruded material.
  • the average crystal grain size at a depth position of t / 2 from the outer surface of the extruded material is 700 ⁇ m or more and 1800 ⁇ m or less with respect to the thickness t of the plate-shaped portion of the extruded material.
  • a method for producing an aluminum alloy extruded material a heating step of heating a billet made of a homogenized aluminum alloy to 350° C. or more and 600° C. or less; an extrusion step of extruding the heated billet to obtain an extruded material; A die quenching step of cooling the extruded material obtained by the extrusion process to 150 ° C. or less at a cooling rate of 7.0 ° C./sec or more and 80 ° C./sec or less; An aging step of artificially aging the cooled extruded material at 120 ° C. or higher and 240 ° C.
  • the aluminum alloy is Si: 0.90% by mass or more and 2.00% by mass or less, Mg: 0.65% by mass or more and 0.90% by mass or less, Cu: 0.25% by mass or more and 0.50% by mass or less, Fe: 0.050% by mass or more and 0.49% by mass or less, Zr: 0.10% by mass or more and 0.25% by mass or less, Ti: 0.010% by mass or more and 0.10% by mass or less, B: 1.0 times or less of Ti on a mass basis, and the balance consisting of Al and unavoidable impurities.
  • the billet made of the aluminum alloy is subjected to a homogenization treatment at 500° C. or higher and 600° C. or lower for 3 hours or more and 24 hours or less to obtain the homogenized billet made of the aluminum alloy.
  • Z ⁇ exp(Q/RT) (1) here, Z: Z factor ⁇ : Strain rate R: Gas constant (8.314 [J/K mol]) T: absolute temperature Q: activation energy (142 [kJ/mol])
  • the aluminum alloy material having the composition described in [1], [3] and [8] above is easily deformed by heating, the extrusion pressure can be lowered, and the productivity of the aluminum alloy extruded material is improved, and the manufacturing cost can be reduced.
  • the aluminum alloy extruded material has the composition and crystal grains described in [1] above, and has a conductivity within the specified range, which greatly improves yield strength and strength.
  • the aluminum alloy extruded material has the composition described in [3] above, has crystal grains, and has an existence density of Mg 2 Si particles within the specified range, yield strength and strength are greatly improved.
  • FIG. 1 is a diagram showing an example (Example 1) of a photograph of a polarized structure of an aluminum alloy extruded material according to one embodiment of the present invention, taken by an optical microscope, in a cross section perpendicular to the direction of extrusion.
  • FIG. 2 is a diagram showing an example (Example 1) of a scanning electron microscope (SEM) photograph of a cross section perpendicular to the extrusion direction of an aluminum alloy extruded material according to one embodiment of the present invention.
  • FIG. 3 is a diagram showing a binarized image of the photograph of FIG. FIG.
  • FIG. 4 is a view showing an example (Example 1) of a photograph taken by a scanning electron microscope (SEM) of a microstructure in a cross section perpendicular to the extrusion direction of an aluminum alloy extruded material according to one embodiment of the present invention.
  • FIG. 5 is a diagram showing an example (Example 1) of an EDX line analysis diagram of an aluminum alloy extruded material according to an embodiment of the present invention.
  • FIG. 6 is a diagram showing a black-and-white reversed image after binarizing the photograph of FIG.
  • FIG. 7 is an example of a cross-sectional shape of an aluminum alloy extruded material.
  • FIG. 8 is an explanatory diagram of a three-point bending test for obtaining bending strength.
  • FIG. 8 is an explanatory diagram of a three-point bending test for obtaining bending strength.
  • FIG. 9 is a plan view showing an example of a shock absorbing member manufactured using the aluminum alloy extruded material according to this embodiment.
  • FIG. 10 is a flow diagram showing an example of a method for manufacturing an aluminum alloy extruded material according to one embodiment of the present invention.
  • FIG. 11 is a drawing showing an extrusion cross-section of a die used in each example and each comparative example.
  • FIG. 12 is a diagram showing an aluminum alloy extruded material produced in each example and each comparative example.
  • FIG. 13 is a diagram showing the amount of deformation from the design shape of the cross section of the extruded material.
  • extruded material and “aluminum alloy extruded material” mean aluminum alloy extruded material unless otherwise specified. ⁇ 1.
  • the chemical composition of the aluminum alloy extruded material according to the present embodiment is composed of Si, Mg, Cu, Fe, Zr, Ti, and B, and the balance, which will be described later, with the balance being Al and unavoidable impurities. As will be described later, the extruded material according to the present embodiment may not contain B.
  • the extruded material according to the present embodiment may have a chemical composition consisting of Si, Mg, Cu, Fe, Zr, Ti, B, and the balance (consisting of Al and unavoidable impurities), Si, Mg, Cu, Fe, A chemical composition consisting of Zr, Ti, and the remainder (made up of Al and unavoidable impurities) may also be used.
  • the aluminum alloy extruded material according to the present embodiment contains crystal grains having an aspect ratio of 5.0 or less and a length of 50 ⁇ m or more and 1000 ⁇ m or less in the long axis direction in a cross section perpendicular to the extrusion direction. Details of the crystal grains will be described later.
  • the electrical conductivity of the surface of the aluminum alloy extruded material according to this embodiment is 51.1 IACS% or less. The details of the electrical conductivity of the extruded material surface will be described later.
  • the aluminum alloy extruded material according to this embodiment contains Mg 2 Si particles having a particle size of 0.10 ⁇ m or more and 5.0 ⁇ m or less in a cross section perpendicular to the extrusion direction. Details of the Mg 2 Si particles will be described later.
  • fine particles containing Zr are present in the aluminum alloy extruded material according to the present embodiment.
  • fine particles containing Zr are sometimes referred to as Zr-containing fine particles. Details of the Zr-containing fine particles will be described later.
  • the content of Si in the extruded material is 0.90% by mass or more, preferably 1.03% by mass or more, and more preferably 1.05% by mass or more. This is because Si easily forms a compound by interacting with Mg, and the formation of Mg 2 Si precipitates contributes to the strength improvement of the extruded material.
  • the amount of Mg added which will be described later, by adding an amount exceeding the amount added to generate Mg 2 Si, the characteristics such as the strength of the extruded material after artificial aging treatment (aging process described later) This is because the
  • the content of Si in the extruded material may be 1.30% by mass or more, or may be 1.50% by mass or more.
  • the content of Si in the extruded material is 2.00% by mass or less, preferably 1.78% by mass or less.
  • the reason for this is to suppress the grain boundary precipitation of single Si and to further increase the toughness of the extruded material. Moreover, it is for reducing an extrusion pressure and improving productivity and a yield.
  • the content of Si in the extruded material may be 1.50% by mass or less, or may be 1.25% by mass or less. [1-1-2. Mg]
  • the content of Mg in the extruded material is 0.65% by mass or more, preferably 0.70% by mass or more, more preferably 0.72% by mass or more, and 0.74% by mass or more. It is even more preferable to have This is because Mg easily forms a compound by interacting with Si, and when Mg 2 Si precipitates are formed, it contributes to the strength improvement of the extruded material.
  • the content of Mg in the extruded material is 0.90% by mass or less, preferably 0.88% by mass or less, and more preferably 0.83% by mass or less.
  • the reason for this is that by setting the amount of precipitates in an appropriate range, the quenching sensitivity is improved and the pressure rise during extrusion is suppressed. Moreover, it is for making the generated Mg 2 Si precipitates easy to form a solid solution at a low temperature, thereby further improving the accuracy of the shape of the product (extruded material).
  • the content of Cu in the extruded material is 0.25% by mass or more, preferably 0.28% by mass or more, more preferably 0.32% by mass or more, and 0.36% by mass or more.
  • the content of Cu in the extruded material is 0.50% by mass or less, preferably 0.45% by mass or less, and more preferably 0.42% by mass or less. The reason for this is that it improves extrusion processability and enables extrusion molding at a low extrusion pressure. Also, this is because the corrosion resistance of the extruded material is improved.
  • [1-1-4. Fe] The content of Fe in the extruded material is 0.050% by mass or more, preferably 0.080% by mass or more, more preferably 0.10% by mass or more, and 0.13% by mass or more. It is even more preferable to have This is because Fe combines with Al and Si to crystallize during casting and has the effect of suppressing coarsening of crystal grains.
  • the content of Fe in the extruded material is 0.49% by mass or less, preferably 0.45% by mass or less, more preferably 0.35% by mass or less, and 0.30% by mass or less. It is more preferably 0.27% by mass or less, and particularly preferably 0.24% by mass or less.
  • the reason for this is to suppress the crystallization of needle-like Al--Fe--Si compounds and further improve the extrusion moldability and the toughness of the extruded product.
  • Zr Zr precipitates as Zr-containing fine particles (details will be described later) during the homogenization process, and becomes the nuclei of crystal grains (details will be described later) generated during extrusion.
  • the content of Zr in the extruded material is 0.10% by mass or more, preferably 0.11% by mass or more, and more preferably 0.13% by mass or more.
  • the reason for this is to increase the number of Zr-containing fine particles, that is, the number of recrystallization nuclei, and to suppress coarsening of crystal grains, which will be described later.
  • the content of Zr in the extruded material is 0.25% by mass or less, preferably 0.20% by mass or less, and more preferably 0.17% by mass or less.
  • the reason for this is that the fluidity of the molten alloy is improved during casting, making it easier to form the material for extrusion by casting, and as a result, the productivity of the extruded material is improved.
  • [1-1-6. Ti] Ti has a function of refining crystal grains during casting, and additionally has an effect of suppressing ingot cracking during casting.
  • the content of Ti in the extruded material is 0.010% by mass or more, preferably 0.020% by mass or more, and more preferably 0.025% by mass or more.
  • the content of Ti in the extruded material is 0.10% by mass or less, preferably 0.085% by mass or less, and more preferably 0.060% by mass or less.
  • the reason for this is that the fluidity of the molten alloy is improved during casting, making it easier to form the material for extrusion by casting, and as a result, the productivity of the extruded material is improved.
  • [1-1-7. B] B like Ti, is also effective in refining grains, and it is thought that adding TiB2 particles will form and disperse. Furthermore, it is thought that the TiB 2 particles act as solidification nuclei of crystals and bring about refinement of crystal grains, which will be described later. B may or may not be included.
  • not including B means not including B other than unavoidable impurities, and B as an unavoidable impurity may be included.
  • the content of B in the extruded material is preferably 0.050 times or more, more preferably 0.10 times or more, and 0.15 times or more that of Ti on a mass basis. is more preferred. The reason for this is to suppress coarsening of crystal grains, which will be described later.
  • the content of B in the extruded material is 1.0 times or less, preferably 0.50 times or less, more preferably 0.25 times or less that of Ti on a mass basis.
  • the reason for this is to suppress bonding of surplus B to Mg, thereby suppressing consumption of Mg to be bonded to Si. [1-1-8.
  • Other elements As inevitable impurities in the extruded material, for example, it is preferable to reduce the content of Mn and Cr as much as possible. The reason for this is that the quenching sensitivity is reduced, the influence of variation in cooling rate on the strength is reduced, and the quality of the extruded material can be stabilized.
  • FIG. 1 is a diagram showing an example (Example 1 to be described later) of a photograph of a polarized structure of an aluminum alloy extruded material according to one embodiment of the present invention taken by an optical microscope in a cross section perpendicular to the extrusion direction.
  • the extruded material has an aspect ratio of 5.0 or less and a length of 50 ⁇ m or more and 1000 ⁇ m in the cross section perpendicular to the extrusion direction (hereinafter referred to as a cross section in this section).
  • the area ratio occupied by the following crystal grains is 90.0% or more, preferably 95.0% or more, more preferably 98.0% or more, particularly 99.0% or more preferable.
  • the reason for this is to suppress cleavage fracture between crystal grains and improve the strength of the extruded material against shear stress.
  • the above area ratio is a value obtained by measuring a range of 1.95 mm ⁇ 2.60 mm in two fields of view in a cross section perpendicular to the extrusion direction, that is, the area ratio of crystal grains to two fields of view.
  • particles that are at the edge of the image and are only partially reflected are not included in either the area of each field of view or the area of the crystal grain (that is, the area of each field of view used for calculating the area ratio is 1 smaller than .95 mm x 2.60 mm).
  • the ratio of the area occupied by the crystal grains is a value expressed as a percentage of the total area of the crystal grains satisfying the above conditions for the two fields of view with respect to the total area of the two fields of view.
  • the outside air temperature is measured, corrected to a numerical display based on 20°C, and then calibrated based on 100.7IACS% and 7.605IACS%.
  • electrical conductivity is measured by contacting a probe to the surface of the extruded material in a direction perpendicular to the direction of extrusion. The measurement is performed at 5 points, and the average value of the electrical conductivity at 3 points excluding the maximum and minimum values is taken as the electrical conductivity of the surface of the aluminum alloy extruded material.
  • the electrical conductivity of the extruded material surface is 51.1 IACS% or less, preferably 51.0 IACS% or less, more preferably 50.9 IACS% or less.
  • the reason for this is that the electrical conductivity of the extruded material surface correlates with the solid solution state of Mg and/or Si solute atoms, and the lower the electrical conductivity of the extruded material surface, the more Mg and/or Si are in solid solution. This is because it is thought that
  • the electrical conductivity of the surface of the extruded material is preferably 40.0 IACS% or higher, more preferably 47.0 IACS% or higher, even more preferably 48.0 IACS% or higher, but is not particularly limited.
  • FIG. 2 is a diagram showing an example (Example 1) of a scanning electron microscope (SEM) photograph of a cross section perpendicular to the extrusion direction of an aluminum alloy extruded material according to one embodiment of the present invention.
  • the Mg 2 Si particles are particles confirmed based on quantitative analysis of the amount of each element in EDX mapping of the same field of view.
  • the Mg 2 Si particles have a Mg content of 30 mass% or more and 80 mass% or less, a Si content of 10 mass% or more and 40 mass% or less, and the balance being Al (which may contain unavoidable impurities.
  • the total content of Mg and Si is 100 mass% (there may be no remainder)), and the value of the ratio Mg/Si based on the mass of Mg and Si is 1.5 or more and 2.5 or less.
  • the black dots in the photograph of FIG. 2 are Mg 2 Si particles.
  • FIG. 3 is a diagram obtained by binarizing the photograph of FIG.
  • the particle size of the Mg 2 Si particles is 0.10 ⁇ m or more and 5.0 ⁇ m or less (particles with sizes outside this range are not Mg 2 Si particles in the present invention).
  • the particle size of the Mg 2 Si particles is determined based on the binarized image of the SEM image.
  • the particle size of the Mg 2 Si particles is the diameter calculated from the area of the binarized black portion of the image assuming that it is a circle.
  • the existence density of Mg 2 Si particles in the cross section perpendicular to the extrusion direction of the extruded material is 1.5 ⁇ 10 3 pieces/mm 2 or more, preferably 2.0 ⁇ 10 3 pieces/mm 2 or more. , 2.4 ⁇ 10 3 pieces/mm 2 or more. This is because solid solution of the Mg element is suppressed and extrudability is improved.
  • the existence density of Mg 2 Si particles in the cross section perpendicular to the extrusion direction of the extruded material is 5.4 ⁇ 10 3 pieces/mm 2 or less, preferably 5.2 ⁇ 10 3 pieces/mm 2 or less. , 4.7 ⁇ 10 3 pieces/mm 2 or less. This is because the yield strength of the extruded material is improved.
  • Example 4 is a view showing an example (Example 1) of a scanning electron microscope (SEM) photograph of the microstructure in a cross section perpendicular to the extrusion direction of an aluminum alloy extruded material according to one embodiment of the present invention.
  • White portions in the photograph of FIG. 4 are Zr-containing fine particles.
  • the particle diameter of the Zr-containing fine particles is 0.010 ⁇ m or more and 1.0 ⁇ m or less (particles having a size outside this range are not Zr-containing fine particles in the present invention), and whether the particle size is within this range is determined by: The determination is made based on a binarized image, which will be described later.
  • the aluminum alloy extruded material according to this embodiment preferably contains Zr-containing fine particles. The reason for this is that crystal grains are more easily formed by using Zr-containing fine particles as nuclei.
  • the Zr-containing fine particles are preferably Al 3 Zr a Si 1-a (0 ⁇ a ⁇ 1).
  • FIG. 5 is a diagram showing an example (Example 1) of an EDX line analysis diagram of an aluminum alloy extruded material according to an embodiment of the present invention.
  • the unit cps on the vertical axis of the EDX line analysis chart is counts per second.
  • the EDX line analysis view at the bottom of FIG. 5 is taken along the straight line in the top SEM picture of FIG.
  • the Zr-containing microparticles are particles that satisfy the above size conditions and have a Zr peak in the EDX line analysis at a location corresponding to the particle in the SEM photograph (white portion in FIG. 4).
  • the Zr-containing fine particles may contain Si.
  • the peak intensity of Zr is the highest or next to the peak intensity of Si, and that the peak intensity of Zr is the highest among the elements other than Al. more preferred.
  • FIG. 6 is a diagram showing a black-and-white inverted image after binarizing the photograph in FIG.
  • the particle size of the Zr-containing fine particles is determined based on the binarized SEM image.
  • black and white are reversed, so the particle size of the Zr-containing fine particles is the diameter calculated from the area of the black portion assuming that it is a circle. If the binarized image is not black-and-white reversed, the particle size of the Zr-containing fine particles is calculated by regarding the white portion as a circle.
  • the existence density of the Zr-containing fine particles in the cross section perpendicular to the extrusion direction of the extruded material is preferably 0.30/ ⁇ m 2 or more, more preferably 0.40/ ⁇ m 2 or more, and 0.40/ ⁇ m 2 or more. More preferably, it is 50/ ⁇ m 2 or more. The reason for this is to suppress coarsening of the crystal grains.
  • the existence density of the Zr-containing fine particles in the cross section perpendicular to the extrusion direction of the extruded material is preferably 3.0 particles/ ⁇ m 2 or less, more preferably 2.0 particles/ ⁇ m 2 or less. It is more preferably 0/ ⁇ m 2 or less. The reason for this is to more reliably generate the crystal grains.
  • the existence density of the Zr-containing fine particles is calculated by dividing the total number N Z of the Zr fine particles in the four fields of view by the area of the four fields of view. That is, the existence density of the Zr-containing fine particles is N Z /(4 ⁇ 109.989) [pieces/ ⁇ m 2 ].
  • [1-6. Mechanical performance of aluminum alloy extruded material] The compressive deformation initiation stress at 500° C.
  • the compressive deformation initiation stress at 500° C. is a value measured by the method of Examples described later.
  • the tensile strength of the aluminum extruded material according to this embodiment is preferably 300 MPa or higher, more preferably 320 MPa or higher, and even more preferably 330 MPa or higher.
  • the tensile strength is a value measured by the method of Examples described later (a value obtained using a No. 5 test piece (dimensions described later) according to JISZ2241).
  • the 0.2% yield strength of the aluminum extruded material according to the present embodiment is preferably 285 MPa or more, more preferably 290 MPa or more, and even more preferably 300 MPa or more.
  • the 0.2% yield strength is a value measured by the method of Examples described later (a value obtained using a No. 5 test piece (the dimensions of which will be described later) according to JISZ2241).
  • the metal structure of the aluminum alloy extruded material according to the present embodiment is dense in the vicinity of the outer surface, and has a gradient structure in which the crystal size is relatively coarse in the central portion in the thickness direction compared to the vicinity of the outer surface.
  • the aluminum alloy extruded material according to the present embodiment has an average crystal grain at a depth position of t / 10 from the outer surface of the extruded material with respect to the thickness t of the plate-shaped portion of the extruded material in a cross section perpendicular to the extrusion direction.
  • the diameter is preferably 60 ⁇ m or more and 120 ⁇ m or less, more preferably 80 ⁇ m or more and 110 ⁇ m or less.
  • the aluminum alloy extruded material according to the present embodiment has an average of t / 2 depth positions from the outer surface of the extruded material with respect to the thickness t of the plate-like portion of the extruded material in the cross section perpendicular to the extrusion direction
  • the crystal grain size is preferably 700 ⁇ m or more and 1800 ⁇ m or less, more preferably 800 ⁇ m or more and 1600 ⁇ m or less.
  • Fig. 7 is an example of a cross-sectional shape of an aluminum alloy extruded material.
  • the depth position of t / 10 from the outer surface of the extruded material with respect to the thickness t of the plate-like portion of the extruded material is near the outer surface be.
  • the depth position of t/2 from the outer surface of the extruded material with respect to the thickness t of the plate-like portion of the extruded material is the central portion in the thickness direction.
  • the above average crystal grain size is the equivalent diameter from the area of each crystal grain for each crystal grain present on the line at the depth position of t / 10 or the depth position of t / 2 in the cross section perpendicular to the extrusion direction is calculated and averaged.
  • the cracks pass straight through the grain boundaries and the crack progresses at a high speed.
  • the crack progresses while being refracted or passes through the crystal grains, so the crack growth rate is slow.
  • the aluminum alloy extruded material according to the present embodiment since it has a tilted structure in which the crystal grains inside are larger than those in the outermost periphery, after the crack occurs in the outermost periphery, the crack progresses slowly inside. Also in the above, excellent bending properties can be obtained as a result. [1-8.
  • bending properties include bending strength in a three-point bending test of a plate-like portion of an extruded material, and cracking resistance that evaluates the limit of bending without cracks or cracks.
  • the aluminum alloy extruded material according to the present embodiment preferably has a bending strength of 320 MPa or more and 390 MPa or less, more preferably 330 MPa or more and 380 MPa, in a three-point bending test of the plate-like portion of the extruded material.
  • Fig. 8 is an explanatory diagram of a three-point bending test for obtaining bending strength.
  • a test piece 10 for the bending test is obtained by cutting out a plate-like portion of an extruded material. As shown in the figure, a test piece 10 is supported by two fulcrums 11, 11, and is pushed downward by a punch 12 from above at an intermediate position between the two fulcrums.
  • the maximum load W is calculated from the load-stroke curve obtained in this test, and the bending strength (bending stress) ⁇ is calculated by the following formula (2) from the section modulus Z, the bending moment M, and the distance L between the fulcrums. .
  • the Charpy impact value of the aluminum alloy extruded material according to the present embodiment is preferably 6 J/cm 2 or more and 50 J/cm 2 or less, more preferably 8 J/cm 2 or more and 45 J/cm 2 or less.
  • the Charpy impact value is less than 6 J/cm 2 , premature breakage occurs when a load or impact is applied, and the effect as a shock absorbing member is not exhibited. Further, when the Charpy impact value is higher than 50 J/cm 2 , the aluminum alloy composition according to the present embodiment has low tensile strength and yield strength, and does not exhibit its effect as a shock absorbing member.
  • the aluminum alloy extruded material has a Charpy impact value of 6 J/cm 2 or more and 50 J/cm 2 or less, excellent impact resistance can be obtained, and it is suitable as a material for impact absorbing members.
  • the impact absorbing member of the present embodiment includes beam materials such as front pillars, center pillars, and rear pillars, frame materials such as side members and bumper stays, bumper reinforcements, crash boxes, and battery cases. , a front underrun protector, a rear underrun protector, etc., but not limited thereto, and can also be applied to a shock absorbing structure of a railroad vehicle or the like.
  • FIG. 9 is a plan view showing an example of a shock absorbing member manufactured using the aluminum alloy extruded material according to this embodiment.
  • the shock absorbing member 2 includes a collision wall plate 3, a rear plate 4 arranged substantially parallel to the collision wall plate 3, and the collision wall plate 3 and the rear plate 4 arranged in a predetermined A plurality of connecting plates 5, 5 connected at intervals are provided.
  • FIG. 10 is a flow chart showing an example of a method for manufacturing an aluminum alloy extruded material according to one embodiment of the present invention. An example of a method for manufacturing an aluminum alloy extruded material according to one embodiment of the present invention will be described below, but the method for manufacturing an extruded material according to the present invention is not limited to this.
  • the method for producing an aluminum alloy extruded material includes a melting process, a casting process, a homogenization process, a heating process, an extrusion process, a die quenching process, and an aging process. including. All of these steps are not necessarily required. For example, if the material after casting is available, the melting step and the casting step are not required, and if the material after homogenization is available, homogenization Each step up to the step is unnecessary. [2-1. Melting process] In the melting step, a molten aluminum alloy is prepared.
  • the chemical composition of the molten metal is preferably the same as the chemical composition of the aluminum alloy extruded material to be obtained, and the elements contained in the aluminum alloy extruded material are as described above.
  • a billet material for extrusion
  • the casting method is not particularly limited, but includes, for example, a vertical float continuous casting method, a vertical hot top continuous casting method, a horizontal continuous casting method and the like.
  • Homogenization process In the homogenization step, a homogenization treatment is performed to homogenize the metal structure of the billet obtained in the casting step, and to sufficiently dissolve the atoms contained in the aluminum alloy.
  • the homogenization process results in a strong extruded material.
  • the chemical composition of the aluminum alloy (billet) used in the homogenization step is preferably the same as the chemical composition of the aluminum alloy extruded material to be obtained, and the elements contained in the aluminum alloy extruded material are as described above. be.
  • the temperature of the homogenization treatment is preferably 500°C or higher, more preferably 530°C or higher, and even more preferably 550°C or higher.
  • the reason for this is to sufficiently homogenize the metal structure of the billet and to sufficiently dissolve the atoms contained in the aluminum alloy.
  • the homogenization temperature is preferably 600° C. or lower, more preferably 570° C. or lower. This is because by suppressing the melting of the intermetallic compound in this way, coarsening of the particles of the intermetallic compound is suppressed, and the mechanical properties of the extruded material are improved.
  • the homogenization time is preferably 3 hours or longer, more preferably 8 hours or longer, and even more preferably 12 hours or longer. The reason for this is to sufficiently homogenize the metal structure of the billet and to sufficiently dissolve the atoms contained in the aluminum alloy.
  • the homogenization time is preferably 24 hours or less, more preferably 20 hours or less, and even more preferably 18 hours or less. The reason for this is to suppress coarsening of the particles of the intermetallic compound and improve the mechanical properties of the extruded material.
  • the temperature of the billet after cooling is preferably 150° C. or lower, more preferably 100° C. or lower.
  • the billet may be cooled to 50°C or less and stored. Cooling methods include, but are not particularly limited to, water cooling, mist cooling, air cooling, fan cooling, and air cooling.
  • the cooling rate is preferably 100° C./h or higher, more preferably 150° C./h or higher.
  • the heating temperature is 350°C or higher, preferably 400°C or higher, and more preferably 450°C or higher. The reason for this is to reduce the deformation resistance of the billet and reduce the extrusion pressure.
  • the heating temperature preferably does not exceed the solidus temperature of the aluminum alloy forming the billet.
  • the reason for this is to suppress melting of intermetallic compounds in the aluminum alloy.
  • the specific heating temperature is 600 ° C. or less, preferably 550 ° C. or less, and 530 ° C. It is more preferably 510° C. or less, more preferably 510° C. or less. [2-5. Extrusion process] In the extrusion step, the billet heated in the heating step is extruded to obtain an extruded material.
  • the billet heated in the heating step is loaded into a container and pressed against an extrusion die (hereinafter referred to as a die) having a predetermined opening shape, thereby extruding a desired cross-sectional shape. wood is obtained.
  • the extruded material according to this embodiment preferably has a hollow shape.
  • the extrusion speed is preferably 5.0 m/min or higher, more preferably 6.5 m/min or higher. The reason for this is that strain is applied to the material, making it easier to form the metal structure having the crystal grains. Moreover, it is because the productivity of the extruded material is improved.
  • the Z factor calculated by the following formula (1) it is preferable to control the Z factor calculated by the following formula (1) to be 1.0 ⁇ 10 7 or more and 1.0 ⁇ 10 11 or less.
  • Z ⁇ exp(Q/RT) (1) here, Z: Z factor ⁇ : Strain rate R: Gas constant (8.314 [J/K mol]) T: absolute temperature Q: activation energy (142 [kJ/mol])
  • Z factor is less than the lower limit of 1.0 ⁇ 10 7 , a non-recrystallized structure or a coarsely recrystallized structure may be obtained, and a finely recrystallized structure may not be obtained. If the Z factor exceeds the upper limit of 1.0 ⁇ 10 11 , the extrusion resistance may increase, making extrusion difficult.
  • Z factor is a type of parameter consisting of strain rate [s -1 ] and temperature [K] introduced when metal is hot worked, and gas constant R and activation energy Q are treated as constant values. , the Z factor is determined with the temperature T and the strain rate ⁇ during hot working as variables.
  • the Z factor can be controlled within the above range.
  • the cooling method is not particularly limited, but includes water cooling, mist cooling, fan air cooling, air cooling, and the like.
  • the die quenching step forms a supersaturated solid solution.
  • the cooling rate is 7.0° C./sec or higher, preferably 10° C./sec or higher, more preferably 12° C./sec or higher. The reason for this is that it suppresses the precipitation of solid-solution components and facilitates the maintenance of a supersaturated solid solution. Moreover, it is because the productivity of the extruded material is improved.
  • the cooling rate is 80°C/sec or less, preferably 40°C/sec or less, and more preferably 20°C/sec or less. The reason for this is to suppress deformation of the extruded material due to thermal contraction during cooling.
  • the target temperature of the die quenching step is 150° C. or lower, preferably 100° C. or lower, and more preferably 50° C. or lower.
  • the extruded material may be stored at room temperature, for example, 30° C. or lower until the aging step described later. [2-7. Aging process] In the aging step, the extruded material cooled in the die quenching step is artificially aged. The aging process causes Mg 2 Si-based precipitates to grow in the extruded material, improving the strength of the extruded material.
  • the aging treatment temperature is 120° C. or higher, preferably 140° C. or higher, and more preferably 160° C. or higher. The reason for this is that Mg 2 Si-based precipitates are easily precipitated in the extruded material.
  • the aging treatment temperature is 240° C. or lower, preferably 220° C. or lower, and more preferably 200° C. or lower. The reason for this is to suppress excessive growth of Mg 2 Si-based precipitates in the extruded material and improve the strength of the extruded material.
  • the aging treatment time is 2 hours or longer, preferably 4 hours or longer, and more preferably 5 hours or longer.
  • the reason for this is to sufficiently precipitate Mg 2 Si-based precipitates.
  • the aging treatment time is 48 hours or less, preferably 16 hours or less, and more preferably 8 hours or less. The reason for this is to suppress excessive growth of Mg 2 Si-based precipitates in the extruded material and improve the strength of the extruded material. Moreover, it is because the productivity of the extruded material is improved.
  • the resulting billet was homogenized for 14 hours.
  • Table 1 shows the temperature in each example and each comparative example in this homogenization process.
  • the billet was then cooled to 30°C at 180°C/h.
  • the cooled billet was then heated to 500°C.
  • FIG. 11 is a diagram showing the extrusion cross section (extrusion hole) of the die used in each example and each comparative example.
  • the extruded material 1 shown in FIGS. 12 and 13 is formed by the die D1.
  • the extruded material 1 is a hollow extruded material in which an outer peripheral wall 11 having a rectangular cross section is integrally formed with a partition wall 12 that divides the interior (hollow portion) into two.
  • the die D1 shown in FIG. 11 has an extrusion hole D10 having an outer peripheral wall forming hole D11 for forming the outer peripheral wall 11 of the extruded material 1 and an intermediate partition wall forming hole D12 for forming the intermediate partition wall 12.
  • the die D1 has a lateral dimension L1 of 50 mm and a longitudinal dimension L2 of 50 mm for the outer peripheral wall forming hole D11.
  • the width T1 of the outer peripheral wall forming hole D11 and the partition wall 12 is 2.5 mm
  • the inner radius of curvature Ri of the outer peripheral wall forming hole D11 is 2.5 mm
  • the outer radius of curvature Ro is 5 mm.
  • the temperature of the extruded material immediately after coming out of the die during extrusion was measured using a contact thermometer. Further, by simulation calculation of the extrusion process, in a cross section perpendicular to the extrusion direction, with respect to the thickness t of the plate-like portion of the extruded material, the depth position of t / 2 and the depth of t / 10 from the outer surface of the extruded material The strain rate at the flat position was calculated. Then, from the measured temperature and the calculated strain rate, the Z factor at the depth position of t/2 and the depth position of t/10 was calculated by the above formula (1).
  • Table 1 shows the Z factor at the depth position of t/2 and the depth position of t/10 in each example and each comparative example in this extrusion process.
  • a die quenching step was performed immediately after the extrusion step, and the temperature of the extruded material was set to 30°C.
  • Table 1 shows the cooling rate in the die quenching process of each example and each comparative example.
  • the extruded material was subjected to artificial aging treatment (aging process) at 180° C. for 6 hours to obtain an aluminum alloy extruded material.
  • the extruded material is an aluminum alloy extruded material obtained after the aging process.
  • the aluminum alloy extruded material after the aging treatment becomes the aluminum alloy extruded material according to the present invention. ⁇ 2.
  • a test piece of ⁇ 8 mm ⁇ 12 mm was cut from the center of the billet that had been homogenized and cooled.
  • the longitudinal direction of the ⁇ 8 mm ⁇ 12 mm is the longitudinal direction (extrusion direction) of the billet.
  • the cut test piece was heated to 500 ° C. at 50 ° C./sec, held at 500 ° C. for 10 min, and strain rate 0.10 / sec at 500 ° C. (increase in compression rate per second), compression rate ( ⁇ The dimension decreased by compression (0 mm before the start of the test) ⁇ /the dimension before compression (12 mm)) was compressed to 0.75 to obtain a stress-strain (compression ratio) diagram. Compression was performed in a vacuum atmosphere.
  • Thermec Master Z manufactured by Fuji Denpa Koki Co., Ltd. was used as a testing machine.
  • the compressive deformation starting stress was defined as the local maximum value of stress between 0 and 0.30 in compressibility.
  • the maximum value is the value at which the load at that compression rate is maximum within a range of ⁇ 0.050 from that compression rate value.
  • Table 1 shows the compressive deformation starting stress measured for the aluminum alloys according to each example and each comparative example.
  • Table 1 shows the evaluation results of the extrudability of the aluminum alloys according to each example and each comparative example. ⁇ 3.
  • Various measurements of aluminum alloy extruded material> 12 and 13 are diagrams showing aluminum alloy extruded materials produced in each example and each comparative example as described.
  • the directions indicated by L, LT, and ST are the directions indicated by arrows "L,”"LT,” and "ST” in FIGS. [3-1.
  • the area ratio occupied by crystal grains with an aspect ratio of 5.0 or less and a length of 50 ⁇ m or more and 1000 ⁇ m or less in the major axis direction was calculated. Particles at the edges of the image and partially outside the image are not included in either the area of each field of view or the area of the grain.
  • the ratio of the area occupied by the crystal grains is a value expressed as a percentage of the total area of the crystal grains satisfying the above conditions for the two fields of view with respect to the total area of the two fields of view.
  • Table 2 shows the area ratios occupied by crystal grains measured for the extruded materials according to each example and each comparative example.
  • [3-2. Measurement of the electrical conductivity of the extruded material surface A sample was obtained by storing the extruded material after the aging process at room temperature for 24 hours. Using a portable eddy current conductivity measuring instrument SIGMATEST 2.069 manufactured by Nihon Förster Co., Ltd., the ambient temperature was measured and corrected to a numerical value based on 20°C. After that, calibration was performed using 100.7 IACS% and 7.605 IACS% as standards.
  • a probe was brought into contact with the extruded material (sample) surface in the direction perpendicular to the extrusion direction, and the electrical conductivity of the extruded material (sample) surface was measured based on the above calibration. This measurement was performed at 5 points on the outer surface of the extruded material, and the average value of 3 points excluding the maximum and minimum values was calculated. [3-3. Existence Density of Mg 2 Si Particles] For each extruded material, a test piece with a thickness of L: 10 mm, ST: 10 mm, LT: 2 mm was cut from the part (side wall) having a thickness in the direction of LT (L-ST surface was cut by 0.5 mm, thickness 2 mm).
  • the cut-out test piece was cut perpendicular to the direction of L (extrusion direction), and a cross section for observation was formed with a cross-section polisher manufactured by JEOL Ltd.
  • a cross-section polisher manufactured by JEOL Ltd.
  • JSM-7000F field emission scanning electron microscope
  • the number NM of Mg 2 Si particles having a particle size of 0.10 ⁇ m or more and 5.0 ⁇ m or less was counted for 4 fields of view.
  • the existence density of Mg 2 Si particles was calculated by dividing the counted number NM of Mg 2 Si particles by the area of 4 fields of view.
  • the definition of Mg 2 Si particles to be counted is as described above.
  • Table 2 shows the existence density of Mg 2 Si particles measured for the extruded materials according to each example and each comparative example.
  • a test piece with a thickness of L: 10 mm, ST: 10 mm, LT: 2 mm was cut from the part (side wall) having a thickness in the direction of LT (L-ST surface was cut by 0.5 mm, thickness 2 mm).
  • the cut-out test piece was cut perpendicular to the direction of L (extrusion direction), and a cross section for observation was formed with a cross-section polisher manufactured by JEOL Ltd.
  • Table 2 shows the existence density of the Zr-containing fine particles measured for the extruded materials according to each example and each comparative example.
  • the aluminum alloy extruded material obtained in each example and each comparative example was measured by the method specified in JISZ2241. The measurement was performed by cutting out the No. 5 test piece. Specifically, it was cut along the extrusion direction (L direction) with a gauge length of 50 mm, a parallel portion length of 60 mm, a width of 25 mm, a thickness of 2 mm, and a shoulder R of 30 mm.
  • Tensile strength was calculated by performing a tensile test (according to JISZ2241) at normal temperature (24°C) of the tensile test piece at a crosshead speed of 2 mm/min, and the 0.2% yield strength was measured by the offset method. .
  • Table 2 shows the tensile strength and 0.2% yield strength measured for the extruded materials according to each example and each comparative example.
  • Table 2 shows the measured deformation amount ⁇ for the extruded materials according to each example and each comparative example. [3-7.
  • Crystal grain size of aluminum alloy extruded material The extruded material after aging treatment was cut along a plane perpendicular to the direction of extrusion. In the cut cross section of the extruded material, the crystal grain size is measured at a depth position of t / 10 and a depth position of t / 2 from the outer surface of the extruded material with respect to the thickness t of the plate-shaped part, and the average The grain size was calculated. Table 2 shows the calculated average crystal grain size at the depth position of t/10 and the depth position of t/2 and the ratio thereof for the extruded materials according to each example and each comparative example. [3-8.
  • Charpy impact value of aluminum alloy extruded material A square bar with a length of 55 mm, a width of 10 mm, and a thickness of 2.5 mm is cut out from the extruded material after aging treatment, and a 45-degree V-shaped groove (V notch) with a depth of 2 mm is provided in the center of the square bar to form a test piece. did. Both ends of this test piece were held, and the Charpy impact value was measured from the absorbed energy at the time of breaking by applying an impact with a hammer from the side opposite to the side where the V-shaped groove was provided.
  • V notch 45-degree V-shaped groove
  • Table 2 shows the Charpy impact values measured for the extruded materials according to each example and each comparative example. ⁇ 4. Evaluation> All of the aluminum alloys according to the examples are excellent in extrudability. Therefore, the productivity of the aluminum alloy extruded material according to each example can be improved, and as a result, the manufacturing cost of the extruded material can be reduced. In addition, the aluminum alloy extruded material according to each example has high tensile strength and yield strength.
  • the extruded material according to Comparative Example 1 has a high surface electrical conductivity and a high density of Mg 2 Si particles in a cross section perpendicular to the extrusion direction. This extruded material had low tensile strength and yield strength.
  • the aluminum alloys of Comparative Examples 2 and 3 have the same composition, do not contain Zr, but contain Mn and Cr.
  • the aluminum alloys according to Comparative Examples 2 and 3 have a high compressive deformation starting stress at 500° C., leading to a decrease in productivity.
  • this composition when the extrusion speed was increased as in Comparative Example 3, cracks occurred in the extruded material (poor extrudability).
  • the extrusion speed is lowered as in Comparative Example 2, an extruded material can be obtained, but the productivity is low and the manufacturing cost increases.
  • the aluminum alloy according to Comparative Example 4 contains a small amount of Zr and contains Mn and Cr.
  • the aluminum alloy according to Comparative Example 4 has a high compressive deformation starting stress at 500° C., leading to a decrease in productivity.
  • the extruded material according to Comparative Example 4 has a high electrical conductivity on the surface of the extruded material, and a high density of Mg 2 Si particles in the cross section perpendicular to the extrusion direction. This extruded material had low tensile strength and yield strength.
  • the aluminum alloy according to Comparative Example 5 has lower contents of Mn and Cr than the aluminum alloy of Comparative Example 4.
  • the extruded material according to Comparative Example 5 has a high electrical conductivity on the surface, and a high density of Mg 2 Si particles in the cross section perpendicular to the extrusion direction. This extruded material had low tensile strength and yield strength.
  • the extruded material according to Comparative Example 6 which has a low Si content, had low tensile strength and yield strength.
  • the extruded material according to Comparative Example 7 which has a low Cu content, had low tensile strength and yield strength.
  • the aluminum alloy according to Comparative Example 8 has a high Cu content.
  • the aluminum alloy according to Comparative Example 8 had a high compressive deformation starting stress at 500° C., and cracks occurred in the extruded material (poor extrudability).
  • the extruded material according to Comparative Example 9 which has a low Mg content, had low tensile strength and yield strength.
  • the aluminum alloy according to Comparative Example 10 has a high Mg content.
  • the aluminum alloy according to Comparative Example 10 had a high compressive deformation initiation stress at 500° C., and cracks occurred in the extruded material (poor extrudability).
  • the aluminum alloy extruded material according to the present invention is low in cost and has high tensile strength and yield strength. Further, according to the method for producing an aluminum alloy extruded material according to the present invention, it is possible to obtain an aluminum alloy extruded material having high tensile strength and yield strength at low cost.
  • the aluminum alloy extruded material of this invention can be used as a high-strength structural material.

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