WO2015182748A1 - アルミニウム合金部材の製造方法及びそれを用いたアルミニウム合金部材 - Google Patents
アルミニウム合金部材の製造方法及びそれを用いたアルミニウム合金部材 Download PDFInfo
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- 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
- C22F1/053—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 zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- the present invention relates to a method for producing an aluminum alloy member and an aluminum alloy member, and more particularly to a method for producing an aluminum alloy member capable of obtaining an aluminum alloy member having excellent shape accuracy and an aluminum alloy member using the same.
- structural members for automobiles and aircraft use Al—Cu-based JIS 2000 aluminum alloys and Al—Cu—Mg—Zn-based JIS 7000 aluminum alloys that can increase strength and strength.
- Patent Document 1 In these aluminum alloys, in order to improve forming processability such as bending, hot forming in which rigidity is lowered while forming, or aluminum alloy is softened by heat treatment (solution treatment) and formed. After the forming process, the strength is increased again by heat treatment (aging treatment) to produce an aluminum alloy member for a structural member.
- the present invention has been made in view of such circumstances, and a method for producing an aluminum alloy member capable of producing an aluminum alloy member having high strength and high yield strength and excellent shape accuracy, and the same are used.
- An object is to provide an aluminum alloy member.
- the production method of the aluminum alloy member of the present invention includes 1.6 mass% or more and 2.6 mass% or less of magnesium (Mg), 6.0 mass% or more and 7.0 mass% or less of zinc (Zn), 0.5 mass% or less. Titanium with a total mass of copper (Cu) or silver (Ag) of 0.5% by mass or less and 0.01% by mass or more and 0.05% by mass or less of copper (Cu) or silver (Ag).
- the aluminum alloy contains a predetermined amount of magnesium, zinc, copper, or silver, the formability of the aluminum alloy is improved and it is possible to form without performing a solution treatment. It becomes. And since titanium has the effect of refining the crystal grains of the molten metal, the strength can be improved.
- This aluminum alloy can maintain high strength and high yield strength even if it is cooled at a cooling rate of 30 ° C./sec or less during cooling after forming, so that the generation of thermal strain and residual stress accompanying cooling can be prevented. It is possible to prevent a reduction in shape accuracy during molding. Therefore, it is possible to realize a method for producing an aluminum alloy member that can produce an aluminum alloy member having high strength and high yield strength and excellent shape accuracy.
- the aluminum alloy is 0.15% by mass or more in total of one or more of manganese (Mn), chromium (Cr) and zirconium (Zr). It is preferable to further contain 0.6% by mass or less. With this configuration, there is an effect of suppressing the coarsening of the crystal grains of the aluminum alloy and improving the strength, resistance to stress corrosion cracking, and fatigue life.
- an aging treatment step of aging treatment by holding the aluminum alloy member at 100 ° C. or more and 200 ° C. or less.
- the aluminum alloy member is aged for 2 hours or more in the aging treatment step. This method improves the strength of the aluminum alloy due to aging.
- the aluminum alloy is air-cooled in the cooling step.
- the aluminum alloy can be cooled easily and inexpensively.
- the aluminum alloy member of the present invention is obtained by the above-described method for producing an aluminum alloy member.
- this aluminum alloy member since it is manufactured using an aluminum alloy containing a predetermined amount of magnesium, zinc, copper or silver, and titanium, the formability of the aluminum alloy is improved, and the solution treatment is not performed. It becomes possible to mold. And this aluminum alloy can maintain high strength and high yield strength even if it is cooled at a cooling rate of 30 ° C./sec or less during cooling after forming, so that generation of thermal strain and residual stress accompanying cooling is prevented. Therefore, it is possible to prevent a decrease in shape accuracy during molding. Therefore, it is possible to realize an aluminum alloy member having high strength and high yield strength and excellent shape accuracy.
- an aluminum alloy member manufacturing method capable of manufacturing an aluminum alloy member having high strength and high yield strength and excellent shape accuracy, and an aluminum alloy member using the same.
- FIG. 1 is a flowchart of a method for manufacturing an aluminum alloy member according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the relationship between the cooling temperature and the cooling time of the aluminum alloy according to the embodiment of the present invention and a general aluminum alloy.
- aluminum alloys having excellent specific strength such as JIS7000 series aluminum alloys are widely used.
- W treatment or solution treatment for softening the aluminum alloy by heat treatment at a predetermined temperature before (or after) the shaping process is necessary.
- it is necessary to quench the aluminum alloy after the solution treatment for example, 30 ° C./second or more).
- the present inventors can not only obtain sufficient formability and shape accuracy by hot forming an aluminum alloy using an aluminum alloy having a predetermined composition, but also cool the aluminum alloy after forming.
- the present inventors have found that the strength of the aluminum alloy can be prevented from being lowered, and have completed the present invention.
- FIG. 1 is a flowchart of a method for producing an aluminum alloy member according to an embodiment of the present invention.
- the manufacturing method of the aluminum alloy member according to the present embodiment includes 1.6 mass% or more and 2.6 mass% or less of magnesium (Mg), 6.0 mass% or more and 7.0 mass% or less.
- the following zinc (Zn), 0.5 mass% or less of copper (Cu) or silver (Ag), and the total amount of copper (Cu) and silver (Ag) is 0.5 mass% or less, 0.01 mass %
- To 0.05% by mass of titanium (Ti) and the balance of aluminum (Al) alloy consisting of aluminum (Al) and inevitable impurities are heated to 400 ° C. to 500 ° C.
- step ST1 forming step ST2 for forming an aluminum alloy extruded from the mold into a desired shape, and forming the formed aluminum alloy at 2 ° C./second to 30 ° C./second, preferably 2 ° C./second to 10 Cooling at °C / second or less Cooling step ST3 for obtaining an aluminum alloy member by cooling at a temperature, aging treatment step ST4 for aging treatment by holding the cooled aluminum alloy member at 100 ° C. or more and 200 ° C. or less, surface treatment on the aged aluminum alloy member, and And post-process ST5 which performs painting.
- the example shown in FIG. 1 demonstrates the example which implements extrusion process ST1 before shaping
- the extrusion step ST1 is not necessarily performed.
- the aging treatment process ST4 and the post-process ST5 are performed after the cooling process ST3 will be described.
- the aging treatment process ST4 and the post-process ST5 may be performed as necessary.
- the aluminum alloy used for the manufacturing method of the aluminum alloy member concerning this Embodiment is demonstrated in detail.
- Al alloy As an aluminum alloy, a 7000 series aluminum alloy having an Al—Zn—Mg series composition and an Al—Zn—Mg—Cu series composition including JIS standard and AA standard (hereinafter, also simply referred to as “7000 series aluminum alloy”) is used. Use. By using this 7000 series aluminum alloy, for example, by applying artificial aging treatment at 120 ° C. to 160 ° C. for 6 hours to 16 hours at T5-T7, the strength is 0.2% proof stress. A high-strength aluminum alloy member having a pressure of 400 MPa or more can be obtained.
- Examples of the aluminum alloy include 1.6% by mass to 2.6% by mass of magnesium (Mg), 6.0% by mass to 7.0% by mass of zinc (Zn), 0.5% by mass or less of copper ( Cu) or silver (Ag), and the total amount of copper (Cu) and silver (Ag) is 0.5 mass% or less, 0.01 mass% or more and 0.05 mass% or less of titanium (Ti) and the balance A composition composed of aluminum (Al) and inevitable impurities is used.
- the strength of the aluminum alloy member can be set to 400 MPa or more with a 0.2% proof stress.
- an aluminum alloy contains 0.15 mass% or more and 0.6 mass% or less in total of 1 type, or 2 or more types among zirconium (Zr), chromium (Cr), or manganese (Mn). .
- Titanium (Ti) has an effect of forming Al 3 Ti at the time of casting the aluminum alloy and making the crystal grains finer, so 0.01% by mass or more is preferable with respect to the total mass of the aluminum alloy. Moreover, if it is 0.05 mass% or less, the tolerance with respect to a stress corrosion cracking will improve.
- the titanium content is preferably 0.01% by mass or more and 0.05% by mass or less.
- Magnesium (Mg) is an element that improves the strength of the aluminum alloy member.
- the content of magnesium (Mg) is 1.6% by mass or more with respect to the total mass of the aluminum alloy from the viewpoint of improving the strength of the aluminum alloy member, and also reduces the extrusion pressure during the extrusion process.
- the magnesium (Mg) content is 2.6% by mass or less, and preferably 1.9% by mass or less.
- the content of magnesium (Mg) is in the range of 1.6% by mass or more and 2.6% by mass or less, and 1.6% by mass or more and 1.9% by mass with respect to the total mass of the aluminum alloy. The range of mass% or less is preferable.
- Zinc (Zn) is an element that improves the strength of the aluminum alloy member.
- content of zinc (Zn) it is 6.0 mass% or more with respect to the total mass of an aluminum alloy from a viewpoint of improving the intensity
- the content of zinc (Zn) is in the range of 6.0 mass% to 7.0 mass% with respect to the total mass of the aluminum alloy, and 6.4 mass% to 7.0 mass%. The range of mass% or less is preferable.
- Copper (Cu) is an element that improves the strength of aluminum alloy members and the resistance to stress corrosion cracking (SCC).
- the content of copper (Cu) is 0% by mass or more and 0% by mass or more based on the total mass of the aluminum alloy from the viewpoint of improving the strength of aluminum alloy members and the resistance to stress corrosion cracking (SCC) and from the viewpoint of extrusion moldability. .5% by mass or less.
- the same effect is acquired even if it changes some or all of copper (Cu) to silver (Ag).
- Zirconium (Zr) forms Al 3 Zr, prevents strength improvement and recovery recrystallization of aluminum alloy, and suppresses coarsening of crystal grains, and has an effect of improving resistance to stress corrosion cracking, and fiber.
- the content is preferably 0.15% by mass or more based on the total mass of the aluminum alloy. Moreover, if it is 0.6 mass% or less, quenching sensitivity will become sharp and intensity
- the content of zirconium (Zr) is preferably 0.15% by mass or more and 0.6% by mass or less with respect to the total mass of the aluminum alloy.
- zirconium (Zr) is replaced with chromium (Cr) or manganese (Mn)
- Cr chromium
- Mn manganese
- Inevitable impurities include iron (Fe), silicon (Si), and the like that are inevitably mixed from ingots and scraps of aluminum alloys.
- the content of inevitable impurities is such that the content of iron (Fe) is 0.25% by mass or less from the viewpoint of maintaining various properties of the aluminum alloy member such as formability, corrosion resistance and weldability, and silicon.
- the content of (Si) is preferably 0.05% by mass or less.
- the aluminum alloy adjusted to the above-described composition range is melted, and then cast by a melt casting method such as a semi-continuous casting method (DC casting method) to form an ingot.
- a melt casting method such as a semi-continuous casting method (DC casting method)
- the ingot of the cast aluminum alloy is heated to a predetermined temperature range (for example, 400 ° C. or more and 500 ° C. or less) to perform a homogenization heat treatment (soaking treatment).
- the heating time is, for example, 2 hours or more.
- the homogenized aluminum alloy ingot is hot-extruded from a pressure-resistant mold in a predetermined temperature range (for example, 400 ° C. or more and 500 ° C. or less).
- the extruded aluminum alloy is formed in a temperature range of 400 ° C. or higher and 500 ° C. or lower. Further, the forming process may be performed simultaneously with the hot extrusion from the mold in the extrusion process, or may be performed in a state where the aluminum alloy after the extrusion process is maintained in a temperature range of 400 ° C. or more and 500 ° C. or less. Good.
- the forming process is not particularly limited as long as the aluminum alloy can be formed into a desired aluminum alloy member shape.
- Examples of the forming process include, for example, the entire longitudinal or partial bending of an extruded shape of an aluminum alloy, partial crushing of an extruded profile, punching into an extruded profile, and trim processing of an extruded profile. And plastic working accompanied by generation of residual stress. Only 1 type may be implemented for these shaping
- the aluminum alloy formed into a desired shape is cooled at a cooling rate of 2 ° C./second to 30 ° C./second, preferably 2 ° C./second to 10 ° C./second.
- the temperature after cooling in the cooling step is, for example, 250 ° C. or lower.
- the aluminum alloy is cooled at a cooling rate of 2 ° C./second to 30 ° C./second, preferably 2 ° C./second to 10 ° C./second. Even when it is cooled, a high-strength aluminum alloy member can be produced.
- FIG. 2 is a diagram showing the relationship between the cooling temperature and the cooling time of the aluminum alloy according to the present embodiment and a general aluminum alloy.
- the cooling time is shown on the horizontal axis
- the temperature of the aluminum alloy is shown on the vertical axis.
- the range showing the relationship between the cooling temperature and the cooling time capable of increasing the strength of the aluminum alloy according to the present embodiment is shown in the region outside (on the left side) of the solid curve L1, and the height of a general aluminum alloy is increased.
- a range showing the relationship between the cooling temperature and the cooling time that can be strengthened is shown in a region outside (left side) of a dashed curve L2.
- the cooling curves L5 and L6 when the aluminum alloy is cooled from 500 ° C. and 550 ° C. at a cooling rate of 2 ° C./second are shown by alternate long and short dash lines, and the aluminum alloy is cooled at a cooling rate of 500 ° C. and 550 ° C. to 30 ° C./second.
- Cooling curves L3 and L4 when cooled by are shown by two-dot chain lines.
- the aluminum alloy according to the present embodiment when the aluminum alloy is cooled at a cooling rate of 30 ° C./second, the aluminum alloy is cooled from any temperature of 500 ° C. and 550 ° C. Even if it exists, the cooling curves L3 and L4 exist in the area
- the cooling curve L 6 when the aluminum alloy is cooled at a cooling rate of 2 ° C./second, when the aluminum alloy is cooled from 550 ° C., the cooling curve L 6 is inside the solid curve L 1.
- the cooling curve L5 does not enter the inside (right side) of the solid curve L1 but passes on the solid curve L1. To do.
- the aluminum alloy according to the present embodiment it is not necessary to rapidly cool the aluminum alloy under the condition of 30 ° C./second, which is the cooling rate at which the residual stress inside the aluminum alloy remains, Even when it is cooled at 2 ° C./second, which is a cooling rate at which the residual stress inside the aluminum alloy is eliminated, a high-strength aluminum alloy can be obtained.
- a high-strength aluminum alloy can be obtained, but also it is possible to prevent a decrease in the shape accuracy of the aluminum alloy member based on the residual stress inside the aluminum alloy generated in the forming process. I understand that.
- the aluminum alloy when the aluminum alloy is cooled similarly from 500 ° C. and 550 ° C. using the same aluminum alloy, the aluminum alloy is cooled at a cooling rate of 2 ° C./sec and 30 ° C./sec.
- the cooling curve L3-L6 passes through the inner side (right side) of the dashed curve L2. Therefore, when producing a high-strength aluminum alloy member using a general aluminum alloy, it is necessary to quench the aluminum alloy at a cooling rate of 30 ° C./second or more, and to eliminate the residual stress of the aluminum alloy. I can't.
- the residual stress inside the aluminum alloy may be eliminated, while obtaining a high-strength aluminum alloy Can not.
- the manufacturing method of the aluminum alloy member according to the present embodiment since an aluminum alloy having a predetermined composition is used, the residual stress is removed by cooling at a cooling rate of 2 ° C./second after hot forming. Even in this case, it becomes possible to produce a high-strength aluminum alloy. Therefore, the manufacturing method of an aluminum alloy member and an aluminum alloy member which can manufacture a high intensity
- the cooling rate of the aluminum alloy in the cooling step is 2 ° C./second or more and 30 ° C./second or less, preferably 2 ° C./second or more and 10 ° C./second or less. If the cooling rate is 2 ° C./second or more, a decrease in the strength of the aluminum alloy can be prevented as shown in FIG. 2, and if the cooling rate is 10 ° C./second or less, thermal strain inside the aluminum alloy and Since the residual stress can be sufficiently removed, the shape accuracy of the aluminum alloy member is improved.
- the cooling rate of the aluminum alloy is preferably 3 ° C./second or more, more preferably 4 ° C./second or more, more preferably 9 ° C./second or less, and 8 ° C./second from the viewpoint of further improving the above-described effects.
- the following is more preferable.
- the cooling step it is preferable to air-cool the aluminum alloy.
- the air cooling conditions are not particularly limited as long as the cooling rate is 2 ° C./second or more and 30 ° C./second or less, preferably 2 ° C./second or more and 10 ° C./second or less.
- air-cooling conditions for example, it may be left in a normal temperature environment ( ⁇ 10 ° C. or higher and 50 ° C. or lower), or may be cooled by blowing air to an aluminum alloy left in a normal temperature environment.
- the aluminum alloy member is held by heat treatment (for example, 100 ° C. or more and 200 ° C. or less) and subjected to aging treatment. Thereby, since the change of the rigidity of the aluminum alloy due to natural aging is reduced and stabilized, the shape accuracy of the aluminum alloy member is improved.
- the temperature of the aging treatment is preferably 100 ° C. or higher, more preferably 125 ° C. or higher, preferably 200 ° C. or lower, and more preferably 175 ° C. or lower from the viewpoint of the strength of the aluminum alloy member.
- the time for aging treatment is preferably 2 hours or more. Thereby, since precipitation of the aluminum alloy by aging treatment occurs, the strength of the aluminum alloy member is improved.
- the time for aging treatment is more preferably 6 hours or more, preferably 48 hours or less, and more preferably 24 hours or less.
- surface treatment and coating are performed from the viewpoint of improving the corrosion resistance, wear resistance, decorativeness, antireflection properties, electrical conductivity, film thickness uniformity, workability, and the like of the cooled aluminum alloy member.
- the surface treatment include alumite treatment, chromate treatment, non-chromate treatment, electrolytic plating treatment, electroless plating treatment, chemical polishing, and electrolytic polishing.
- the aluminum alloy contains a predetermined amount of magnesium, zinc, copper, or silver, a high-strength material is not subjected to a solution treatment.
- An aluminum alloy can be formed. And this aluminum alloy does not recrystallize on the surface and increase the grain size of the internal work structure even when cooled at a cooling rate of 30 ° C./second or less, preferably 10 ° C./second or less during cooling after forming. It is possible to prevent the occurrence of heat distortion and residual stress due to cooling because the high strength can be maintained. As a result, an aluminum alloy having a 0.2% proof stress of 430 MPa or more and a tensile strength of 500 MPa or more can be produced with high shape accuracy.
- Example 1 1.68 wt% magnesium (Mg), 6.70 wt% zinc (Zn), 0.26 wt% copper (Cu), 0.02 wt% titanium (Ti), 0.25 wt%
- An aluminum (Al) alloy containing manganese (Mn) and 0.19% by mass of zirconium (Zr) was extruded and molded by heat treatment at 500 ° C. Thereafter, the formed aluminum alloy was cooled to 100 ° C. at a cooling rate of 2.45 ° C./second to produce an aluminum alloy member.
- Example 2 Commercially available 7000 series aluminum alloy (magnesium (Mg) content: 2.5 mass%, zinc (Zn) content: 5.5 mass%, copper (Cu) content: 1.6 mass%) An aluminum alloy member was produced and evaluated in the same manner as in Example 1 except that it was used and the aluminum alloy was cooled from 466 ° C. to 100 ° C. or less at 35 ° C./second. As a result, the 0.2% yield strength was 466 MPa, and the tensile strength was 532 MPa. This result is considered to be because the thermal stability of the aluminum alloy was lowered because an aluminum alloy having a composition different from that of Example 1 was used. The results are shown in Table 1 below.
- Example 3 Commercially available 7000 series aluminum alloy (magnesium (Mg) content: 2.5 mass%, zinc (Zn) content: 5.5 mass%, copper (Cu) content: 1.6 mass%) An aluminum alloy member was produced and evaluated in the same manner as in Example 1 except that it was used and the aluminum alloy was cooled from 400 ° C to 100 ° C at 2.43 ° C / second. As a result, the 0.2% proof stress was 230 MPa, and the tensile strength was 352 MPa. This result is considered to be because the thermal stability of the aluminum alloy was lowered because an aluminum alloy having a composition different from that of Example 1 was used. The results are shown in Table 1 below.
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Abstract
Description
アルミニウム合金としては、JIS規格及びAA規格を含むAl-Zn-Mg系組成及びAl-Zn-Mg-Cu系組成を有する7000系アルミニウム合金(以下、単に、「7000系アルミニウム合金」ともいう)を用いる。この7000系アルミニウム合金を用いることにより、例えば、T5-T7における120℃以上160℃以下での6時間以上16時間以下の条件での人工時効処理を施すことにより、強度が0.2%耐力で400MPa以上となる高強度のアルミニウム合金部材を得ることができる。
押出工程では、上述した組成の範囲内に調整したアルミニウム合金を溶解させた後、半連続鋳造法(DC鋳造法)などの溶解鋳造法により鋳造して鋳塊(ビレット)とする。次に、鋳造されたアルミニウム合金の鋳塊を所定の温度範囲(例えば、400℃以上500℃以下)に加熱して均質化熱処理(均熱処理)する。これにより、アルミニウム合金の鋳塊中の結晶粒内の偏析などが消失してアルミニウム合金部材の強度が向上する。加熱時間は、例えば、2時間以上である。次に、均質化したアルミニウム合金の鋳塊を所定の温度範囲(例えば、400℃以上500℃以下)で耐圧性の型枠から熱間押出する。
成形工程では、押出したアルミニウム合金を400℃以上500℃以下の温度範囲で成形加工する。また、成形加工は、押出工程での型枠からの熱間押出と同時に実施してもよく、押出工程後のアルミニウム合金を400℃以上500℃以下の温度範囲に維持した状態で実施してもよい。
冷却工程では、所望の形状に成形されたアルミニウム合金を2℃/秒以上30℃/秒以下、好ましくは2℃/秒以上10℃/秒以下の冷却速度で冷却する。冷却工程での冷却後の温度は、例えば、250℃以下である。このような冷却速度で冷却することにより、成形工程での成形加工によってアルミニウム合金内部に生じた残留応力を除去することが可能となるので、アルミニウム合金部材の形状精度が向上する。さらに、本実施の形態においては、上述した組成のアルミニウム合金を用いることにより、アルミニウム合金を2℃/秒以上30℃/秒以下、好ましくは2℃/秒以上10℃/秒以下の冷却速度で冷却した場合であっても、高強度のアルミニウム合金部材を製造することが可能となる。
時効処理工程では、アルミニウム合金部材を加熱処理(例えば、100℃以上200℃以下)で保持して時効処理する。これにより、自然時効によるアルミニウム合金の剛性の変化が低減して安定するので、アルミニウム合金部材の形状精度が向上する。時効処理の温度としては、アルミニウム合金部材の強度の観点から、100℃以上が好ましく、125℃以上がより好ましく、200℃以下が好ましく、175℃以下がより好ましい。
後工程では、冷却したアルミニウム合金部材の耐食性、耐摩耗性、装飾性、光反射防止性、導通性、膜厚均一性、及び作業性などを向上する観点から、表面処理及び塗装を施す。表面処理としては、例えば、アルマイト処理、クロメート処理、ノンクロメート処理、電解メッキ処理、無電解メッキ処理、化学研磨及び電解研磨などが挙げられる。
1.68質量%のマグネシウム(Mg)、6.70質量%の亜鉛(Zn)、0.26質量%の銅(Cu)、0.02質量%のチタニウム(Ti)、0.25質量%のマンガン(Mn)、0.19質量%のジルコニウム(Zr)を含有するアルミニウム(Al)合金を押出し、500℃で加熱処理により成形した。その後、成形したアルミニウム合金を2.45℃/秒の冷却速度で100℃まで冷却してアルミニウム合金部材を製造した。その後、製造したアルミニウム合金部材の任意の位置から採取した米国材料試験規格ASTM E557の平板引張試験片を用い、ASTM E557に規定する金属材料試験方法に準じ、引張強さ、及び耐力を測定した。その結果、0.2%耐力は、492MPaであり、引張強度が531MPaであった。なお、これらの測定値は、各例とも3つの採取試験片の測定値の平均値とした。結果を下記表1に示す。
1.68質量%のマグネシウム(Mg)、6.70質量%の亜鉛(Zn)、0.26質量%の銅(Cu)、0.02質量%のチタニウム(Ti)、0.25質量%のマンガン(Mn)、0.19質量%のジルコニウム(Zr)を含有するアルミニウム(Al)合金を押出し、500℃で加熱処理により成形した。その後、成形したアルミニウム合金を0.36℃/秒の冷却速度で200℃まで冷却してアルミニウム合金部材を製造した。その後、製造したアルミニウム合金部材の任意の位置から採取した米国材料試験規格ASTM E557の平板引張試験片を用い、ASTM E557に規定する金属材料試験方法に準じ、引張強さ、及び耐力を測定した。その結果、0.2%耐力は、393MPaであり、引張強度が467MPaであった。なお、これらの測定値は、各例とも3つの採取試験片の測定値の平均値とした。結果を下記表1に示す。
市販の7000系アルミニウム合金(マグネシウム(Mg)の含有量:2.5質量%、亜鉛(Zn)の含有量:5.5質量%、銅(Cu)の含有量:1.6質量%)を用いたこと、及びアルミニウム合金を466℃から100℃以下に35℃/秒で冷却したこと以外は、実施例1と同様にしてアルミニウム合金部材を製造して評価した。その結果、0.2%耐力は、466MPaであり、引張強度は、532MPaであった。この結果は、実施例1と組成が異なるアルミニウム合金を用いたために、アルミニウム合金の熱安定性が低下したためと考えられる。結果を下記表1に示す。
市販の7000系アルミニウム合金(マグネシウム(Mg)の含有量:2.5質量%、亜鉛(Zn)の含有量:5.5質量%、銅(Cu)の含有量:1.6質量%)を用いたこと、及びアルミニウム合金を400℃から100℃まで2.43℃/秒で冷却したこと以外は、実施例1と同様にしてアルミニウム合金部材を製造して評価した。その結果、0.2%耐力は、230MPaであり、引張強度は、352MPaであった。この結果は、実施例1と組成が異なるアルミニウム合金を用いたために、アルミニウム合金の熱安定性が低下したためと考えられる。結果を下記表1に示す。
Claims (6)
- 1.6質量%以上2.6質量%以下のマグネシウム(Mg)、6.0質量%以上7.0質量%以下の亜鉛(Zn)、0.5質量%以下の銅(Cu)又は銀(Ag)であって銅(Cu)と銀(Ag)との総量が0.5質量%以下、0.01質量%以上0.05質量%以下のチタニウム(Ti)及び残部がアルミニウム(Al)と不可避的不純物とからなるアルミニウム(Al)合金を400℃以上500℃以下の条件に加熱して成形加工する成形工程と、
成形加工した前記アルミニウム合金を2℃/秒以上30℃/秒以下の冷却速度で冷却してアルミニウム合金部材を得る冷却工程とを含むことを特徴とする、アルミニウム合金部材の製造方法。 - 前記アルミニウム合金は、マンガン(Mn)、クロム(Cr)及びジルコニウム(Zr)のうち1種又は2種以上の合計で0.15質量%以上0.6質量%以下を含有する、請求項1に記載のアルミニウム合金部材の製造方法。
- さらに、前記アルミニウム合金部材を100℃以上200℃以下の条件で保持して時効処理する時効処理工程を含む、請求項1又は請求項2に記載のアルミニウム合金部材の製造方法。
- 前記時効処理工程において、前記アルミニウム合金部材を2時間以上時効処理する、請求項1から請求項3のいずれか1項に記載のアルミニウム合金部材の製造方法。
- 前記冷却工程において、前記アルミニウム合金を空冷する、請求項1から請求項4のいずれか1項に記載のアルミニウム合金部材の製造方法。
- 請求項1から請求項5のいずれか1項に記載のアルミニウム合金部材の製造方法によって得られたことを特徴とする、アルミニウム合金部材。
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