WO2022130484A1 - Aluminum alloy and aluminum alloy casting material - Google Patents
Aluminum alloy and aluminum alloy casting material Download PDFInfo
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- WO2022130484A1 WO2022130484A1 PCT/JP2020/046678 JP2020046678W WO2022130484A1 WO 2022130484 A1 WO2022130484 A1 WO 2022130484A1 JP 2020046678 W JP2020046678 W JP 2020046678W WO 2022130484 A1 WO2022130484 A1 WO 2022130484A1
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- Prior art keywords
- aluminum alloy
- mass
- casting material
- present
- casting
- Prior art date
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 71
- 238000005266 casting Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 31
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 description 22
- 239000010949 copper Substances 0.000 description 19
- 230000035882 stress Effects 0.000 description 17
- 239000011777 magnesium Substances 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000011701 zinc Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 10
- 230000032683 aging Effects 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000004512 die casting Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910017758 Cu-Si Inorganic materials 0.000 description 1
- 229910017818 Cu—Mg Inorganic materials 0.000 description 1
- 229910017931 Cu—Si Inorganic materials 0.000 description 1
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 1
- 229910009369 Zn Mg Inorganic materials 0.000 description 1
- 229910007573 Zn-Mg Inorganic materials 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
Definitions
- the present invention relates to an aluminum alloy for casting and an aluminum alloy casting material composed of the aluminum alloy.
- Aluminum alloy material is used for the housings of portable electronic devices and electronic terminals because it is lightweight and has an excellent texture.
- the demand for thinness and weight reduction for these portable electronic devices is increasing year by year, and the aluminum alloy used for the housing is required to have higher strength.
- smartphones are often stored in pockets when not in use, and bending stress is often applied in such situations. That is, it is indispensable that the aluminum alloy used for the housing of a portable electronic device has high strength and ductility (toughness) in addition to excellent castability.
- Patent Document 1 Japanese Unexamined Patent Publication No. 48-32719
- the excellent castability of an Al—Cu—Si-based or Al—Si—Cu—Mg-based alloy is utilized, and conventional casting is performed.
- the weight of silicon is 7.5 to 1.2%
- copper is 4.0 to 5.5%
- magnesium is 0.2 to 1.0%.
- a high-strength aluminum alloy for casting which is composed of the balance aluminum and impurities and has excellent castability, is disclosed.
- Patent Document 2 Japanese Unexamined Patent Publication No. 60-57497
- the weight is 6 More than% 13% silicon, 3% more than 5.5% copper, 1% more than 4% zinc, 0.2% more than 1% magnesium and more than 0.03% 1
- a heat-resistant high-strength aluminum alloy containing up to% antimony and composed of the balance aluminum and impurities is disclosed.
- the high-strength aluminum alloy for casting described in Patent Document 1 and the heat-resistant high-strength aluminum alloy described in Patent Document 2 are imparted with excellent mechanical properties in addition to excellent castability.
- heat treatment such as artificial aging is indispensable.
- the heat treatment process not only increases the manufacturing cost and manufacturing time, but also affects the dimensions and shape of the aluminum alloy casting material.
- the housing of a portable electronic device is required to have high dimensional accuracy in addition to being thin, it is desirable to be able to realize high strength and excellent ductility without heat treatment.
- an object of the present invention is to provide an aluminum alloy and an aluminum alloy casting material which have excellent castability and can exhibit high mechanical properties without heat treatment. To do. More specifically, it is an object of the present invention to provide an aluminum alloy and an aluminum alloy casting material having excellent castability, high 0.2% proof stress and excellent ductility without heat treatment. ..
- the present invention Si: 7.0-9.0 mass%, Cu: 2.0-4.0% by mass, Mg: 0.8-1.2% by mass, Fe: 0.3 to 0.5% by mass, Mn: 0.3 to 0.5% by mass, Zn: 2.0 to 4.0% by mass, including The balance consists of Al and unavoidable impurities, We provide aluminum alloys, which are characterized by.
- the aluminum alloy of the present invention Sr: 0.008 to 0.04% by mass, Be: 0.001 to 0.004% by mass, Ti: 0.05 to 0.005% by mass, B: 0.01 to 0.005% by mass, It is preferable to include any one or more of them.
- the present invention Made of the aluminum alloy of the present invention 0.2% proof stress is 230MPa or more, The breaking elongation is 2.5% or more, Also provided are aluminum alloy castings, which are characterized by.
- the aluminum alloy casting material of the present invention can exhibit a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more without performing heat treatment after forming a desired shape by casting.
- the more preferable 0.2% proof stress is 240 MPa or more, and the more preferable breaking elongation is 3.0% or more.
- an aluminum alloy and an aluminum alloy casting material which have excellent castability and can exhibit high mechanical properties without heat treatment. More specifically, according to the present invention, it is possible to provide an aluminum alloy and an aluminum alloy casting material having excellent castability, high 0.2% proof stress and excellent ductility without heat treatment. ..
- the aluminum alloy of the present invention has Si: 7.0 to 9.0% by mass, Cu: 2.0 to 4.0% by mass, Mg: 0.8 to 1.2% by mass, Fe: 0.3. It is an aluminum alloy containing ⁇ 0.5% by mass, Mn: 0.3 to 0.5% by mass, Zn: 2.0 to 4.0% by mass, and the balance is Al and unavoidable impurities.
- Si 7.0 to 9.0% by mass
- Cu 2.0 to 4.0% by mass
- Mg 0.8 to 1.2% by mass
- Fe 0.3.
- It is an aluminum alloy containing ⁇ 0.5% by mass
- Mn 0.3 to 0.5% by mass
- Zn 2.0 to 4.0% by mass
- each component will be described in detail.
- Essential additive element Si 7.0 to 9.0% by mass Si has the property of improving the castability of aluminum and also has the effect of improving mechanical properties such as tensile strength. This effect becomes remarkable when Si: 7.0% by mass or more. On the contrary, when Si: 9.0% by mass or more, eutectic Si and primary Si that crystallize tend to be coarsened. When these compounds are coarsened, they tend to be the starting point when they break, which tends to lead to a decrease in elongation. A more preferable amount of Si added is 7.5 to 8.5% by mass.
- Cu 2.0-4.0% by mass
- Cu has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Cu: 2.0% by mass or more.
- it is more than 4.0% by mass the Cu-based crystallized matter tends to be coarsened and the elongation tends to decrease. Further, as the Cu content increases, the corrosion resistance also decreases. Further, when the alumite treatment is performed, the color tends to be yellowish.
- a more preferable amount of Cu added is 2.5 to 3.7% by mass, and more preferably 3.5% by mass or less.
- Mg 0.8-1.2% by mass Mg has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mg: 0.8% by mass or more. On the contrary, if it exceeds 1.2% by mass, a coarse compound is likely to be formed, and the elongation is likely to decrease.
- Si, Mg and Cu are elements that are precipitated as compounds by aging treatment and contribute to precipitation strengthening.
- the aluminum alloy of the present invention is mainly used as a non-heat treatment material, and the strengthening mechanism by these elements is basic.
- the solid solution is strengthened.
- Fe 0.2 to 0.5% by mass Fe has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Fe: 0.2% by mass or more. It also has the effect of preventing seizure in mold casting such as the die casting method. If it exceeds 0.5% by mass, it becomes easy to form a coarse needle-shaped Al- (Si, Fe, Mn) -based compound that is the starting point of fracture.
- Mn 0.3 to 0.5% by mass
- Mn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mn: 0.3% by mass or more. It also has the effect of granulating Al- (Si, Fe, Mn) compounds. On the contrary, if it exceeds 0.5% by mass, the Al- (Si, Fe, Mn) -based compound tends to be coarsened.
- Zn 2.0 to 4.0% by mass
- Zn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Zn: 2.0% by mass or more. On the contrary, if it exceeds 4.0% by mass, stress corrosion cracking is likely to occur. In addition, discoloration and color unevenness are likely to occur when the anodic oxide film treatment is applied.
- Be 0.001 to 0.004% by mass Be has an effect of forming an oxide film on the surface of the molten metal when it is melted and suppressing the depletion of other elements such as Mg. It also has the effect of suppressing the blackening of the surface of the casting. This effect becomes remarkable at Be 0.001% by mass or more. Even if it is added in an amount of more than 0.004% by mass, the effect is not improved so much, so it is preferably less than 0.004% by mass.
- Ti 0.05 to 0.005% by mass Ti mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
- B 0.01 to 0.005% by mass B mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
- the method for producing the aluminum alloy of the present invention is not particularly limited as long as the effect of the present invention is not impaired, and various conventionally known production methods may be used.
- the aluminum alloy casting material of the present invention is made of the aluminum alloy of the present invention, and is characterized by having a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more.
- the more preferable 0.2% proof stress is 240 MPa or more, and the more preferable breaking elongation is 3.0% or more.
- the excellent mechanical properties are basically realized by strict optimization of the composition, regardless of the shape and size of the aluminum alloy casting material, and regardless of the part and orientation of the aluminum alloy casting material. It has a target property.
- the aluminum alloy casting material of the present invention can exhibit a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more without performing heat treatment such as aging treatment.
- the shape and size of the aluminum alloy casting material are not particularly limited as long as the effects of the present invention are not impaired, and they can be used as various conventionally known members.
- Examples of the member include an electronic terminal housing.
- the method for producing the aluminum alloy casting material of the present invention is not particularly limited as long as the effect of the present invention is not impaired, and the aluminum alloy of the present invention may be used for casting by various conventionally known methods.
- the casting material using the alloy of the present invention has excellent mechanical properties, particularly toughness, even without heat treatment, heat treatment such as aging treatment may be performed. When the aging treatment is performed, higher mechanical properties can be obtained by strengthening the precipitation of compounds such as Si, Mg, Cu and Zn.
- Example Aluminum alloys having the compositions described in Examples 1 to 5 were melted, the casting pressure was 120 MPa, the molten metal temperature was 730 ° C, and the mold temperature was 170 ° C, and die casting was performed.
- the mold shape is a plate shape of 55 mm ⁇ 110 mm ⁇ 3 mm.
- the aluminum alloy has excellent die-casting properties, and a good aluminum alloy casting material (die-casting material) was obtained.
- the unit of the numerical values shown in Table 1 is mass% concentration.
- the 14B test piece specified in JIS-Z2241 was collected from each of the obtained cast aluminum alloys and subjected to a tensile test at room temperature.
- the tensile strength, 0.2% proof stress and breaking elongation are shown in Table 2. It became the value of. Further, when the Rockwell hardness of the obtained cast aluminum alloy was measured, the values shown in Table 2 were obtained.
- the cast aluminum alloy material is still die-cast and has not been heat-treated such as aging treatment.
- ⁇ Comparison example A comparative aluminum alloy casting material (die-cast material) was obtained in the same manner as in Examples except that the melted materials were adjusted so as to have the components described as Comparative Examples 1 to 22 in Table 1. In addition, the tensile properties and Rockwell hardness were measured in the same manner as in Examples. The obtained values are shown in Table 2. If there is no description of the numerical value, it means that the measurement is not performed.
- Example 1 to which Sr is added has higher tensile strength and elongation than Example 4 to which Sr is not added (the content of Sr is extremely small).
- the aluminum alloy castings having the compositions of Comparative Examples 1 to 5 having a high content of Si, Cu and Mn show a high 0.2% proof stress, but the breaking elongation is 2.0% or less. .. Further, the aluminum alloy castings having the compositions of Comparative Examples 6 to 10 and Comparative Examples 13 to 19 having a high Fe content also do not reach 2.5% in elongation at break.
- the hardness of the aluminum alloy casting material having the compositions of Comparative Example 11 in which the amount of Mg added is small and does not contain Zn and Comparative Example 12 in which the amount of Mg added is small is a low value, and sufficient strength can be obtained. You can see that it is not.
- the aluminum alloy casting material having the composition of Comparative Example 20 having a low content of Si and Cu has a breaking elongation of 2.5% or more, but has a low proof stress of 0.2%.
- Comparative Example 21 having a low content of Si and Zn and a high content of Cu and Mn has high tensile strength and 0.2% proof stress, but has a low breaking elongation of less than 2.5%. It is a value.
- Comparative Example 22 in which the contents of Cu and Mn are high the elongation at break is as low as less than 2.5%, and the 0.2% proof stress does not reach 230 MPa.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The present invention provides an aluminum alloy that has exceptional casting properties and that can exhibit high mechanical properties without being subjected to a heat treatment, and an aluminum alloy casting material. More specifically, the present invention provides: an aluminum alloy that has exceptional casting properties, and that has a high 0.2% proof stress and exceptional ductility without being subjected to a heat treatment; and an aluminum alloy casting material. The aluminum alloy according to the present invention is characterized by containing 7.0-9.0 mass% of Si, 2.0-4.0 mass% of Cu, 0.8-1.2 mass% of Mg, 0.3-0.5 mass% of Fe, 0.3-0.5 mass% of Mn, and 2.0-4.0 mass% of Zn, the balance being Al and unavoidable impurities.
Description
本発明は鋳物用のアルミニウム合金及び当該アルミニウム合金からなるアルミニウム合金鋳物材に関する。
The present invention relates to an aluminum alloy for casting and an aluminum alloy casting material composed of the aluminum alloy.
軽量であることに加えて優れた質感を有していることから、携帯可能な電子機器や電子端末の筐体にアルミニウム合金材が使用されている。これらの携帯用電子機器に対する薄さ及び軽量化の要求は年々高くなっており、筐体に用いられるアルミニウム合金にはより高い強度が求められている。
Aluminum alloy material is used for the housings of portable electronic devices and electronic terminals because it is lightweight and has an excellent texture. The demand for thinness and weight reduction for these portable electronic devices is increasing year by year, and the aluminum alloy used for the housing is required to have higher strength.
特に、スマートフォンは使用されない際はポケット等にしまわれることが多く、当該状況においては曲げ応力が印加される場合が多い。即ち、携帯用電子機器の筐体に使用されるアルミニウム合金は優れた鋳造性に加えて、高い強度と延性（靭性）を有することが必要不可欠である。
In particular, smartphones are often stored in pockets when not in use, and bending stress is often applied in such situations. That is, it is indispensable that the aluminum alloy used for the housing of a portable electronic device has high strength and ductility (toughness) in addition to excellent castability.
これに対し、例えば、特許文献１（特開昭４８－３２７１９号公報）では、Ａｌ－Ｃｕ－Ｓｉ系あるいはＡｌ－Ｓｉ－Ｃｕ－Ｍｇ系合金の優れた鋳造性を生かして、且つ従来の鋳造用高力アルミニウム合金に匹敵する強度を有する合金を得ることを目的とし、重量で珪素７．５～１．２％、銅４．０～５．５％、マグネシウム０．２～１．０％、残部アルミニウム及び不純物からなる鋳造性の優れた鋳物用高力アルミニウム合金、が開示されている。
On the other hand, for example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 48-32719), the excellent castability of an Al—Cu—Si-based or Al—Si—Cu—Mg-based alloy is utilized, and conventional casting is performed. For the purpose of obtaining an alloy with strength comparable to that of high-strength aluminum alloys, the weight of silicon is 7.5 to 1.2%, copper is 4.0 to 5.5%, and magnesium is 0.2 to 1.0%. , A high-strength aluminum alloy for casting, which is composed of the balance aluminum and impurities and has excellent castability, is disclosed.
上記特許文献１に記載の鋳物用高力アルミニウム合金においては、約５００℃の溶体化処理を行った後に時効硬化させることで、アルミニウム合金鋳物に優れた機械的性質を与えることができる、とされている。
In the high-strength aluminum alloy for casting described in Patent Document 1, it is said that excellent mechanical properties can be imparted to the aluminum alloy casting by performing solution hardening treatment at about 500 ° C. and then age hardening. ing.
また、特許文献２（特開昭６０－５７４９７号公報）では、鋳造性が良好で強靭性に富み、且つ耐熱性の優れた熱処理型の高力アルミニウム合金を得ることを目的として、重量で６％を超え１３％までの珪素、３％を超え５．５％までの銅、１％を超え４％までの亜鉛、０．２％を超え１％までのマグネシウム及び０．０３％を超え１％までのアンチモンを含み、残部アルミニウム及び不純物よりなる耐熱性高力アルミニウム合金、が開示されている。
Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 60-57497), for the purpose of obtaining a heat-treated high-strength aluminum alloy having good castability, high toughness, and excellent heat resistance, the weight is 6 More than% 13% silicon, 3% more than 5.5% copper, 1% more than 4% zinc, 0.2% more than 1% magnesium and more than 0.03% 1 A heat-resistant high-strength aluminum alloy containing up to% antimony and composed of the balance aluminum and impurities is disclosed.
上記特許文献２に記載の耐熱性高力アルミニウム合金においては、Ａｌ－Ｓｉ－Ｃｕ－Ｚｎ－Ｍｇ系合金において銅が３％を超えて含まれる場合に、合金中にアンチモンを添加すると時効処理に際して合金の時効硬化性が促進され靭性をそれほど低下することなしに合金強度が著しく向上すると共に合金の耐熱衝撃性が著しく改善される、とされている。
In the heat-resistant high-strength aluminum alloy described in Patent Document 2, when copper is contained in excess of 3% in the Al—Si—Cu—Zn—Mg-based alloy, adding antimon to the alloy causes aging treatment. It is said that the aging curability of the alloy is promoted, the strength of the alloy is remarkably improved without significantly reducing the toughness, and the thermal shock resistance of the alloy is remarkably improved.
上記特許文献１に記載の鋳物用高力アルミニウム合金及び上記特許文献２に記載の耐熱性高力アルミニウム合金においては、優れた鋳造性に加えて優れた機械的性質が付与されているとしているが、当該機械的性質を実現するためには人工時効等の熱処理が必須となっている。
It is said that the high-strength aluminum alloy for casting described in Patent Document 1 and the heat-resistant high-strength aluminum alloy described in Patent Document 2 are imparted with excellent mechanical properties in addition to excellent castability. In order to realize the mechanical properties, heat treatment such as artificial aging is indispensable.
しかしながら、熱処理工程は製造コストや製造時間を増加させるだけでなく、アルミニウム合金鋳物材の寸法及び形状にも影響する。特に、携帯用電子機器の筐体は薄いことに加えて高い寸法精度が求められるため、熱処理を施すことなく高い強度及び優れた延性を実現できることが望ましい。
However, the heat treatment process not only increases the manufacturing cost and manufacturing time, but also affects the dimensions and shape of the aluminum alloy casting material. In particular, since the housing of a portable electronic device is required to have high dimensional accuracy in addition to being thin, it is desirable to be able to realize high strength and excellent ductility without heat treatment.
以上のような従来技術における問題点に鑑み、本発明の目的は、優れた鋳造性を有すると共に、熱処理を施すことなく高い機械的性質を発現することができるアルミニウム合金及びアルミニウム合金鋳物材を提供することにある。より具体的には、本発明は、優れた鋳造性を有すると共に、熱処理を施すことなく高い０．２％耐力と優れた延性を有するアルミニウム合金及びアルミニウム合金鋳物材を提供することを目的としている。
In view of the above problems in the prior art, an object of the present invention is to provide an aluminum alloy and an aluminum alloy casting material which have excellent castability and can exhibit high mechanical properties without heat treatment. To do. More specifically, it is an object of the present invention to provide an aluminum alloy and an aluminum alloy casting material having excellent castability, high 0.2% proof stress and excellent ductility without heat treatment. ..
本発明者らは、上記目的を達成すべく、アルミニウム合金の組成範囲について鋭意研究を重ねた結果、Ｓｉ、Ｃｕ、Ｍｇ、Ｆｅ、Ｍｎ及びＺｎの添加量を全て厳密に制御すること等が極めて有効であることを見出し、本発明に到達した。
As a result of diligent research on the composition range of the aluminum alloy in order to achieve the above object, the present inventors have made it extremely possible to strictly control the addition amounts of Si, Cu, Mg, Fe, Mn and Zn. We have found it to be effective and have reached the present invention.
即ち、本発明は、
Ｓｉ：７．０～９．０質量％、
Ｃｕ：２．０～４．０質量％、
Ｍｇ：０．８～１．２質量％、
Ｆｅ：０．３～０．５質量％、
Ｍｎ：０．３～０．５質量％、
Ｚｎ：２．０～４．０質量％、を含み、
残部がＡｌ及び不可避不純物よりなること、
を特徴とするアルミニウム合金、を提供する。 That is, the present invention
Si: 7.0-9.0 mass%,
Cu: 2.0-4.0% by mass,
Mg: 0.8-1.2% by mass,
Fe: 0.3 to 0.5% by mass,
Mn: 0.3 to 0.5% by mass,
Zn: 2.0 to 4.0% by mass, including
The balance consists of Al and unavoidable impurities,
We provide aluminum alloys, which are characterized by.
Ｓｉ：７．０～９．０質量％、
Ｃｕ：２．０～４．０質量％、
Ｍｇ：０．８～１．２質量％、
Ｆｅ：０．３～０．５質量％、
Ｍｎ：０．３～０．５質量％、
Ｚｎ：２．０～４．０質量％、を含み、
残部がＡｌ及び不可避不純物よりなること、
を特徴とするアルミニウム合金、を提供する。 That is, the present invention
Si: 7.0-9.0 mass%,
Cu: 2.0-4.0% by mass,
Mg: 0.8-1.2% by mass,
Fe: 0.3 to 0.5% by mass,
Mn: 0.3 to 0.5% by mass,
Zn: 2.0 to 4.0% by mass, including
The balance consists of Al and unavoidable impurities,
We provide aluminum alloys, which are characterized by.
本発明のアルミニウム合金は、
Ｓｒ：０．００８～０．０４質量％、
Ｂｅ：０．００１～０．００４質量％、
Ｔｉ：０．０５～０．００５質量％、
Ｂ：０．０１～０．００５質量％、
のうちのいずれか一種以上を含むこと、が好ましい。 The aluminum alloy of the present invention
Sr: 0.008 to 0.04% by mass,
Be: 0.001 to 0.004% by mass,
Ti: 0.05 to 0.005% by mass,
B: 0.01 to 0.005% by mass,
It is preferable to include any one or more of them.
Ｓｒ：０．００８～０．０４質量％、
Ｂｅ：０．００１～０．００４質量％、
Ｔｉ：０．０５～０．００５質量％、
Ｂ：０．０１～０．００５質量％、
のうちのいずれか一種以上を含むこと、が好ましい。 The aluminum alloy of the present invention
Sr: 0.008 to 0.04% by mass,
Be: 0.001 to 0.004% by mass,
Ti: 0.05 to 0.005% by mass,
B: 0.01 to 0.005% by mass,
It is preferable to include any one or more of them.
また、本発明は、
本発明のアルミニウム合金からなり、
０．２％耐力が２３０ＭＰａ以上であり、
破断伸びが２．５％以上であること、
を特徴とするアルミニウム合金鋳物材、も提供する。 Further, the present invention
Made of the aluminum alloy of the present invention
0.2% proof stress is 230MPa or more,
The breaking elongation is 2.5% or more,
Also provided are aluminum alloy castings, which are characterized by.
本発明のアルミニウム合金からなり、
０．２％耐力が２３０ＭＰａ以上であり、
破断伸びが２．５％以上であること、
を特徴とするアルミニウム合金鋳物材、も提供する。 Further, the present invention
Made of the aluminum alloy of the present invention
0.2% proof stress is 230MPa or more,
The breaking elongation is 2.5% or more,
Also provided are aluminum alloy castings, which are characterized by.
本発明のアルミニウム合金鋳物材は、鋳造によって所望の形状とした後、熱処理を施すことなく２３０ＭＰａ以上の０．２％耐力と２．５％以上の破断伸びを発現することができる。より好ましい０．２％耐力は２４０ＭＰａ以上であり、より好ましい破断伸びは３．０％以上である。
The aluminum alloy casting material of the present invention can exhibit a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more without performing heat treatment after forming a desired shape by casting. The more preferable 0.2% proof stress is 240 MPa or more, and the more preferable breaking elongation is 3.0% or more.
本発明によれば、優れた鋳造性を有すると共に、熱処理を施すことなく高い機械的性質を発現することができるアルミニウム合金及びアルミニウム合金鋳物材を提供することができる。より具体的には、本発明によれば、優れた鋳造性を有すると共に、熱処理を施すことなく高い０．２％耐力と優れた延性を有するアルミニウム合金及びアルミニウム合金鋳物材を提供することができる。
According to the present invention, it is possible to provide an aluminum alloy and an aluminum alloy casting material which have excellent castability and can exhibit high mechanical properties without heat treatment. More specifically, according to the present invention, it is possible to provide an aluminum alloy and an aluminum alloy casting material having excellent castability, high 0.2% proof stress and excellent ductility without heat treatment. ..
以下、本発明のアルミニウム合金及びアルミニウム合金鋳物材の代表的な実施形態について詳細に説明するが、本発明はこれらのみに限定されるものではない。
Hereinafter, typical embodiments of the aluminum alloy and the aluminum alloy casting material of the present invention will be described in detail, but the present invention is not limited to these.
１．アルミニウム合金
本発明のアルミニウム合金は、Ｓｉ：７．０～９．０質量％、Ｃｕ：２．０～４．０質量％、Ｍｇ：０．８～１．２質量％、Ｆｅ：０．３～０．５質量％、Ｍｎ：０．３～０．５質量％、Ｚｎ：２．０～４．０質量％、を含み、残部がＡｌ及び不可避不純物よりなるアルミニウム合金である。以下、各成分について詳細に説明する。 1. 1. Aluminum alloy The aluminum alloy of the present invention has Si: 7.0 to 9.0% by mass, Cu: 2.0 to 4.0% by mass, Mg: 0.8 to 1.2% by mass, Fe: 0.3. It is an aluminum alloy containing ~ 0.5% by mass, Mn: 0.3 to 0.5% by mass, Zn: 2.0 to 4.0% by mass, and the balance is Al and unavoidable impurities. Hereinafter, each component will be described in detail.
本発明のアルミニウム合金は、Ｓｉ：７．０～９．０質量％、Ｃｕ：２．０～４．０質量％、Ｍｇ：０．８～１．２質量％、Ｆｅ：０．３～０．５質量％、Ｍｎ：０．３～０．５質量％、Ｚｎ：２．０～４．０質量％、を含み、残部がＡｌ及び不可避不純物よりなるアルミニウム合金である。以下、各成分について詳細に説明する。 1. 1. Aluminum alloy The aluminum alloy of the present invention has Si: 7.0 to 9.0% by mass, Cu: 2.0 to 4.0% by mass, Mg: 0.8 to 1.2% by mass, Fe: 0.3. It is an aluminum alloy containing ~ 0.5% by mass, Mn: 0.3 to 0.5% by mass, Zn: 2.0 to 4.0% by mass, and the balance is Al and unavoidable impurities. Hereinafter, each component will be described in detail.
（１）必須の添加元素
Ｓｉ：７．０～９．０質量％
Ｓｉはアルミニウムの鋳造性を向上させる特性を有するとともに引張強度等の機械的性質を向上させる作用がある。この作用はＳｉ：７．０質量％以上で顕著となる。逆にＳｉ：９．０質量％以上となると晶出する共晶Ｓｉや初晶Ｓｉが粗大化しやすくなる。それら化合物が粗大化すると破断する際の起点となりやすいため、伸びの低下につながりやすい。より好ましいＳｉの添加量は７．５～８．５質量％である。 (1) Essential additive element Si: 7.0 to 9.0% by mass
Si has the property of improving the castability of aluminum and also has the effect of improving mechanical properties such as tensile strength. This effect becomes remarkable when Si: 7.0% by mass or more. On the contrary, when Si: 9.0% by mass or more, eutectic Si and primary Si that crystallize tend to be coarsened. When these compounds are coarsened, they tend to be the starting point when they break, which tends to lead to a decrease in elongation. A more preferable amount of Si added is 7.5 to 8.5% by mass.
Ｓｉ：７．０～９．０質量％
Ｓｉはアルミニウムの鋳造性を向上させる特性を有するとともに引張強度等の機械的性質を向上させる作用がある。この作用はＳｉ：７．０質量％以上で顕著となる。逆にＳｉ：９．０質量％以上となると晶出する共晶Ｓｉや初晶Ｓｉが粗大化しやすくなる。それら化合物が粗大化すると破断する際の起点となりやすいため、伸びの低下につながりやすい。より好ましいＳｉの添加量は７．５～８．５質量％である。 (1) Essential additive element Si: 7.0 to 9.0% by mass
Si has the property of improving the castability of aluminum and also has the effect of improving mechanical properties such as tensile strength. This effect becomes remarkable when Si: 7.0% by mass or more. On the contrary, when Si: 9.0% by mass or more, eutectic Si and primary Si that crystallize tend to be coarsened. When these compounds are coarsened, they tend to be the starting point when they break, which tends to lead to a decrease in elongation. A more preferable amount of Si added is 7.5 to 8.5% by mass.
Ｃｕ：２．０～４．０質量％
Ｃｕは、引張強度等の機械的性質を向上させる作用を有する。この作用はＣｕ：２．０質量％以上で顕著となる。逆に、４．０質量％より多くするとＣｕ系晶出物が粗大化しやすくなり、伸びが低下しやすくなる。またＣｕの含有量が大きくなると耐食性も低下する。更に、アルマイト処理した際に、色彩が黄色味を帯びやすくなる。より好ましいＣｕの添加量は２．５～３．７質量％であり、更に好ましくは３．５質量％以下である。 Cu: 2.0-4.0% by mass
Cu has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Cu: 2.0% by mass or more. On the contrary, when it is more than 4.0% by mass, the Cu-based crystallized matter tends to be coarsened and the elongation tends to decrease. Further, as the Cu content increases, the corrosion resistance also decreases. Further, when the alumite treatment is performed, the color tends to be yellowish. A more preferable amount of Cu added is 2.5 to 3.7% by mass, and more preferably 3.5% by mass or less.
Ｃｕは、引張強度等の機械的性質を向上させる作用を有する。この作用はＣｕ：２．０質量％以上で顕著となる。逆に、４．０質量％より多くするとＣｕ系晶出物が粗大化しやすくなり、伸びが低下しやすくなる。またＣｕの含有量が大きくなると耐食性も低下する。更に、アルマイト処理した際に、色彩が黄色味を帯びやすくなる。より好ましいＣｕの添加量は２．５～３．７質量％であり、更に好ましくは３．５質量％以下である。 Cu: 2.0-4.0% by mass
Cu has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Cu: 2.0% by mass or more. On the contrary, when it is more than 4.0% by mass, the Cu-based crystallized matter tends to be coarsened and the elongation tends to decrease. Further, as the Cu content increases, the corrosion resistance also decreases. Further, when the alumite treatment is performed, the color tends to be yellowish. A more preferable amount of Cu added is 2.5 to 3.7% by mass, and more preferably 3.5% by mass or less.
Ｍｇ：０．８～１．２質量％
Ｍｇは、引張強度等の機械的性質を向上させる作用を有する。この作用はＭｇ：０．８質量％以上で顕著となる。逆に１．２質量％を超えると粗大な化合物が形成されやすくなり、伸びが低下しやすくなる。 Mg: 0.8-1.2% by mass
Mg has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mg: 0.8% by mass or more. On the contrary, if it exceeds 1.2% by mass, a coarse compound is likely to be formed, and the elongation is likely to decrease.
Ｍｇは、引張強度等の機械的性質を向上させる作用を有する。この作用はＭｇ：０．８質量％以上で顕著となる。逆に１．２質量％を超えると粗大な化合物が形成されやすくなり、伸びが低下しやすくなる。 Mg: 0.8-1.2% by mass
Mg has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mg: 0.8% by mass or more. On the contrary, if it exceeds 1.2% by mass, a coarse compound is likely to be formed, and the elongation is likely to decrease.
Ｓｉ、Ｍｇ及びＣｕは、時効処理によって化合物として析出し、析出強化に寄与する元素であるが、本発明のアルミニウム合金は非熱処理材として用いられることを主としており、これらの元素による強化機構は基本的に固溶強化となる。
Si, Mg and Cu are elements that are precipitated as compounds by aging treatment and contribute to precipitation strengthening. However, the aluminum alloy of the present invention is mainly used as a non-heat treatment material, and the strengthening mechanism by these elements is basic. The solid solution is strengthened.
Ｆｅ：０．２～０．５質量％
Ｆｅは、引張強度等の機械的性質を向上させる作用を有する。この作用はＦｅ：０．２質量％以上で顕著となる。また、ダイカスト法等の金型鋳造において、焼き付きを防止する効果もある。０．５質量％を超えると破断の起点となる粗大な針状のＡｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物を形成しやすくなる。 Fe: 0.2 to 0.5% by mass
Fe has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Fe: 0.2% by mass or more. It also has the effect of preventing seizure in mold casting such as the die casting method. If it exceeds 0.5% by mass, it becomes easy to form a coarse needle-shaped Al- (Si, Fe, Mn) -based compound that is the starting point of fracture.
Ｆｅは、引張強度等の機械的性質を向上させる作用を有する。この作用はＦｅ：０．２質量％以上で顕著となる。また、ダイカスト法等の金型鋳造において、焼き付きを防止する効果もある。０．５質量％を超えると破断の起点となる粗大な針状のＡｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物を形成しやすくなる。 Fe: 0.2 to 0.5% by mass
Fe has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Fe: 0.2% by mass or more. It also has the effect of preventing seizure in mold casting such as the die casting method. If it exceeds 0.5% by mass, it becomes easy to form a coarse needle-shaped Al- (Si, Fe, Mn) -based compound that is the starting point of fracture.
Ｍｎ：０．３～０．５質量％
Ｍｎは、引張強度等の機械的性質を向上させる作用を有する。この作用は、Ｍｎ：０．３質量％以上で顕著となる。また、Ａｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物を粒状にする作用も有する。逆に０．５質量％を超えるとＡｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物が粗大化しやすい。 Mn: 0.3 to 0.5% by mass
Mn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mn: 0.3% by mass or more. It also has the effect of granulating Al- (Si, Fe, Mn) compounds. On the contrary, if it exceeds 0.5% by mass, the Al- (Si, Fe, Mn) -based compound tends to be coarsened.
Ｍｎは、引張強度等の機械的性質を向上させる作用を有する。この作用は、Ｍｎ：０．３質量％以上で顕著となる。また、Ａｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物を粒状にする作用も有する。逆に０．５質量％を超えるとＡｌ－（Ｓｉ，Ｆｅ，Ｍｎ）系化合物が粗大化しやすい。 Mn: 0.3 to 0.5% by mass
Mn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Mn: 0.3% by mass or more. It also has the effect of granulating Al- (Si, Fe, Mn) compounds. On the contrary, if it exceeds 0.5% by mass, the Al- (Si, Fe, Mn) -based compound tends to be coarsened.
Ｚｎ：２．０～４．０質量％
Ｚｎは、引張強度等の機械的性質を向上させる作用を有する。この作用は、Ｚｎ：２．０質量％以上で顕著となる。逆に４．０質量％を超えると応力腐食割れが起こりやすくなる。また、陽極酸化皮膜処理を施した際に、変色や色むらが起こりやすくなる。 Zn: 2.0 to 4.0% by mass
Zn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Zn: 2.0% by mass or more. On the contrary, if it exceeds 4.0% by mass, stress corrosion cracking is likely to occur. In addition, discoloration and color unevenness are likely to occur when the anodic oxide film treatment is applied.
Ｚｎは、引張強度等の機械的性質を向上させる作用を有する。この作用は、Ｚｎ：２．０質量％以上で顕著となる。逆に４．０質量％を超えると応力腐食割れが起こりやすくなる。また、陽極酸化皮膜処理を施した際に、変色や色むらが起こりやすくなる。 Zn: 2.0 to 4.0% by mass
Zn has an action of improving mechanical properties such as tensile strength. This effect becomes remarkable when Zn: 2.0% by mass or more. On the contrary, if it exceeds 4.0% by mass, stress corrosion cracking is likely to occur. In addition, discoloration and color unevenness are likely to occur when the anodic oxide film treatment is applied.
（２）任意の添加元素
Ｓｒ：０．００８～０．０４質量％
Ｓｒは、共晶Ｓｉを微細化、粒状化させる作用を有し、この効果は、Ｓｒ：０．００８質量％以上で顕著となる。０．０４質量％を超えて添加しても、効果の向上があまり認められないため、０．０４質量％未満にすることが好ましい。 (2) Arbitrary additive element Sr: 0.008 to 0.04% by mass
Sr has an action of refining and granulating eutectic Si, and this effect becomes remarkable when Sr: 0.008% by mass or more. Even if it is added in an amount of more than 0.04% by mass, the effect is not improved so much, so it is preferably less than 0.04% by mass.
Ｓｒ：０．００８～０．０４質量％
Ｓｒは、共晶Ｓｉを微細化、粒状化させる作用を有し、この効果は、Ｓｒ：０．００８質量％以上で顕著となる。０．０４質量％を超えて添加しても、効果の向上があまり認められないため、０．０４質量％未満にすることが好ましい。 (2) Arbitrary additive element Sr: 0.008 to 0.04% by mass
Sr has an action of refining and granulating eutectic Si, and this effect becomes remarkable when Sr: 0.008% by mass or more. Even if it is added in an amount of more than 0.04% by mass, the effect is not improved so much, so it is preferably less than 0.04% by mass.
Ｂｅ：０．００１～０．００４質量％
Ｂｅは、溶解した際に溶湯表面に酸化被膜を形成し、Ｍｇ等の他の元素の減耗を抑制する効果がある。また、鋳物の表面が黒色化することを抑制する効果もある。この効果は、Ｂｅ０．００１質量％以上で顕著となる。０．００４質量％を超えて添加されても、効果の向上があまり認められないため、０．００４質量％未満にすることが好ましい。 Be: 0.001 to 0.004% by mass
Be has an effect of forming an oxide film on the surface of the molten metal when it is melted and suppressing the depletion of other elements such as Mg. It also has the effect of suppressing the blackening of the surface of the casting. This effect becomes remarkable at Be 0.001% by mass or more. Even if it is added in an amount of more than 0.004% by mass, the effect is not improved so much, so it is preferably less than 0.004% by mass.
Ｂｅは、溶解した際に溶湯表面に酸化被膜を形成し、Ｍｇ等の他の元素の減耗を抑制する効果がある。また、鋳物の表面が黒色化することを抑制する効果もある。この効果は、Ｂｅ０．００１質量％以上で顕著となる。０．００４質量％を超えて添加されても、効果の向上があまり認められないため、０．００４質量％未満にすることが好ましい。 Be: 0.001 to 0.004% by mass
Be has an effect of forming an oxide film on the surface of the molten metal when it is melted and suppressing the depletion of other elements such as Mg. It also has the effect of suppressing the blackening of the surface of the casting. This effect becomes remarkable at Be 0.001% by mass or more. Even if it is added in an amount of more than 0.004% by mass, the effect is not improved so much, so it is preferably less than 0.004% by mass.
Ｔｉ：０．０５～０．００５質量％
Ｔｉは組織を微細化することで、主に靭性に寄与する。下限値未満ではその効果が小さく、上限値を超えて含有させても、すでに十分に微細化されており効果がない上、過剰に加えると粗大晶出物を形成することで延性に悪影響を及ぼすようになるため、上記範囲で制限する必要がある。 Ti: 0.05 to 0.005% by mass
Ti mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
Ｔｉは組織を微細化することで、主に靭性に寄与する。下限値未満ではその効果が小さく、上限値を超えて含有させても、すでに十分に微細化されており効果がない上、過剰に加えると粗大晶出物を形成することで延性に悪影響を及ぼすようになるため、上記範囲で制限する必要がある。 Ti: 0.05 to 0.005% by mass
Ti mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
Ｂ：０．０１～０．００５質量％
Ｂは組織を微細化することで、主に靭性に寄与する。下限値未満ではその効果が小さく、上限値を超えて含有させても、すでに十分に微細化されており効果がない上、過剰に加えると粗大晶出物を形成することで延性に悪影響を及ぼすようになるため、上記範囲で制限する必要がある。 B: 0.01 to 0.005% by mass
B mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
Ｂは組織を微細化することで、主に靭性に寄与する。下限値未満ではその効果が小さく、上限値を超えて含有させても、すでに十分に微細化されており効果がない上、過剰に加えると粗大晶出物を形成することで延性に悪影響を及ぼすようになるため、上記範囲で制限する必要がある。 B: 0.01 to 0.005% by mass
B mainly contributes to toughness by refining the structure. If it is less than the lower limit, the effect is small, and even if it is contained above the upper limit, it is already sufficiently finely divided and has no effect, and if it is added excessively, it adversely affects ductility by forming coarse crystals. Therefore, it is necessary to limit within the above range.
なお、本発明の効果を損なわない限りにおいて、本発明のアルミニウム合金の製造方法は特に限定されず、従来公知の種々の製造方法を用いればよい。
The method for producing the aluminum alloy of the present invention is not particularly limited as long as the effect of the present invention is not impaired, and various conventionally known production methods may be used.
２．アルミニウム合金鋳物材
本発明のアルミニウム合金鋳物材は、本発明のアルミニウム合金からなり、０．２％耐力が２３０ＭＰａ以上、破断伸びが２．５％以上であること、を特徴としている。より好ましい０．２％耐力は２４０ＭＰａ以上であり、より好ましい破断伸びは３．０％以上である。 2. 2. Aluminum Alloy Casting Material The aluminum alloy casting material of the present invention is made of the aluminum alloy of the present invention, and is characterized by having a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more. The more preferable 0.2% proof stress is 240 MPa or more, and the more preferable breaking elongation is 3.0% or more.
本発明のアルミニウム合金鋳物材は、本発明のアルミニウム合金からなり、０．２％耐力が２３０ＭＰａ以上、破断伸びが２．５％以上であること、を特徴としている。より好ましい０．２％耐力は２４０ＭＰａ以上であり、より好ましい破断伸びは３．０％以上である。 2. 2. Aluminum Alloy Casting Material The aluminum alloy casting material of the present invention is made of the aluminum alloy of the present invention, and is characterized by having a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more. The more preferable 0.2% proof stress is 240 MPa or more, and the more preferable breaking elongation is 3.0% or more.
優れた機械的性質は基本的に組成を厳密に最適化したことによって実現されており、アルミニウム合金鋳物材の形状及びサイズに依らず、またアルミニウム合金鋳物材の部位及び方位に依らず、当該機械的性質を有している。
The excellent mechanical properties are basically realized by strict optimization of the composition, regardless of the shape and size of the aluminum alloy casting material, and regardless of the part and orientation of the aluminum alloy casting material. It has a target property.
また、本発明のアルミニウム合金鋳物材においては、時効処理等の熱処理を施すことなく、２３０ＭＰａ以上の０．２％耐力と２．５％以上の破断伸びを発現することができる。
Further, the aluminum alloy casting material of the present invention can exhibit a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more without performing heat treatment such as aging treatment.
なお、本発明の効果を損なわない限りにおいて、アルミニウム合金鋳物材の形状及びサイズは特に限定されず、従来公知の種々の部材として使用することができる。当該部材としては、例えば、電子端末筐体を挙げることができる。
The shape and size of the aluminum alloy casting material are not particularly limited as long as the effects of the present invention are not impaired, and they can be used as various conventionally known members. Examples of the member include an electronic terminal housing.
また、本発明の効果を損なわない限りにおいて、本発明のアルミニウム合金鋳物材の製造方法は特に限定されず、本発明のアルミニウム合金を用いて従来公知の種々の方法で鋳造を行えばよい。更に、本発明の合金を用いた鋳物材は、非熱処理でも優れた機械的特性、特に靭性を有するが、時効処理等の熱処理を行っても良い。時効処理を行うとＳｉ，Ｍｇ，Ｃｕ，Ｚｎ等の化合物の析出強化により、より高い機械的特性を得ることができる。
Further, the method for producing the aluminum alloy casting material of the present invention is not particularly limited as long as the effect of the present invention is not impaired, and the aluminum alloy of the present invention may be used for casting by various conventionally known methods. Further, although the casting material using the alloy of the present invention has excellent mechanical properties, particularly toughness, even without heat treatment, heat treatment such as aging treatment may be performed. When the aging treatment is performed, higher mechanical properties can be obtained by strengthening the precipitation of compounds such as Si, Mg, Cu and Zn.
以上、本発明の代表的な実施形態について説明したが、本発明はこれらのみに限定されるものではなく、種々の設計変更が可能であり、それら設計変更は全て本発明の技術的範囲に含まれる。
Although the typical embodiments of the present invention have been described above, the present invention is not limited to these, and various design changes are possible, and all of these design changes are included in the technical scope of the present invention. Is done.
≪実施例≫
表１において、実施例１～実施例５として記載されている組成を有するアルミニウム合金を溶製し、鋳造圧力を１２０ＭＰａ、溶湯温度を７３０℃、金型温度を１７０℃ とし、ダイカストを行った。金型形状は５５ｍｍ×１１０ｍｍ×３ｍｍの板状である。アルミニウム合金は優れたダイカスト性を有しており、良好なアルミニウム合金鋳物材（ダイカスト材）が得られた。なお、表１に記載の数値の単位は質量％濃度である。 << Example >>
In Table 1, aluminum alloys having the compositions described in Examples 1 to 5 were melted, the casting pressure was 120 MPa, the molten metal temperature was 730 ° C, and the mold temperature was 170 ° C, and die casting was performed. The mold shape is a plate shape of 55 mm × 110 mm × 3 mm. The aluminum alloy has excellent die-casting properties, and a good aluminum alloy casting material (die-casting material) was obtained. The unit of the numerical values shown in Table 1 is mass% concentration.
表１において、実施例１～実施例５として記載されている組成を有するアルミニウム合金を溶製し、鋳造圧力を１２０ＭＰａ、溶湯温度を７３０℃、金型温度を１７０℃ とし、ダイカストを行った。金型形状は５５ｍｍ×１１０ｍｍ×３ｍｍの板状である。アルミニウム合金は優れたダイカスト性を有しており、良好なアルミニウム合金鋳物材（ダイカスト材）が得られた。なお、表１に記載の数値の単位は質量％濃度である。 << Example >>
In Table 1, aluminum alloys having the compositions described in Examples 1 to 5 were melted, the casting pressure was 120 MPa, the molten metal temperature was 730 ° C, and the mold temperature was 170 ° C, and die casting was performed. The mold shape is a plate shape of 55 mm × 110 mm × 3 mm. The aluminum alloy has excellent die-casting properties, and a good aluminum alloy casting material (die-casting material) was obtained. The unit of the numerical values shown in Table 1 is mass% concentration.
得られた各実施アルミニウム合金鋳物材よりＪＩＳ－Ｚ２２４１に定められる１４Ｂ号試験片を採取し、室温にて引張試験を行ったところ、引張強度、０．２％耐力及び破断伸びは表２に記載の値となった。また、得られた実施アルミニウム合金鋳物材のロックウェル硬さを測定したところ、表２に記載の値となった。ここで、実施アルミニウム合金鋳物材はダイカストのままであり、時効処理等の熱処理は施していない。
The 14B test piece specified in JIS-Z2241 was collected from each of the obtained cast aluminum alloys and subjected to a tensile test at room temperature. The tensile strength, 0.2% proof stress and breaking elongation are shown in Table 2. It became the value of. Further, when the Rockwell hardness of the obtained cast aluminum alloy was measured, the values shown in Table 2 were obtained. Here, the cast aluminum alloy material is still die-cast and has not been heat-treated such as aging treatment.
≪比較例≫
表１に比較例１～比較例２２として記載の成分となるように溶解材を調整したこと以外は実施例と同様にして、比較アルミニウム合金鋳物材（ダイカスト材）を得た。また、実施例と同様にして、引張特性及びロックウェル硬さを測定した。得られた値を表２に示す。なお、数値の記載がない場合は測定を行っていないことを意味している。 ≪Comparison example≫
A comparative aluminum alloy casting material (die-cast material) was obtained in the same manner as in Examples except that the melted materials were adjusted so as to have the components described as Comparative Examples 1 to 22 in Table 1. In addition, the tensile properties and Rockwell hardness were measured in the same manner as in Examples. The obtained values are shown in Table 2. If there is no description of the numerical value, it means that the measurement is not performed.
表１に比較例１～比較例２２として記載の成分となるように溶解材を調整したこと以外は実施例と同様にして、比較アルミニウム合金鋳物材（ダイカスト材）を得た。また、実施例と同様にして、引張特性及びロックウェル硬さを測定した。得られた値を表２に示す。なお、数値の記載がない場合は測定を行っていないことを意味している。 ≪Comparison example≫
A comparative aluminum alloy casting material (die-cast material) was obtained in the same manner as in Examples except that the melted materials were adjusted so as to have the components described as Comparative Examples 1 to 22 in Table 1. In addition, the tensile properties and Rockwell hardness were measured in the same manner as in Examples. The obtained values are shown in Table 2. If there is no description of the numerical value, it means that the measurement is not performed.
実施例及び比較例で得られた各アルミニウム合金鋳物材の引張特性を比較すると、実施例で得られたアルミニウム合金鋳物材のみが２３０ＭＰａ以上の０．２％耐力と２．５％以上の破断伸びを共に有していることが分かる。また、実施例において、Ｓｒを添加した実施例１の方が、Ｓｒを添加していない（Ｓｒの含有量が極めて少ない）実施例４より、引張強度と伸びが高いことが分かる。
Comparing the tensile properties of each aluminum alloy casting material obtained in Examples and Comparative Examples, only the aluminum alloy casting material obtained in Examples has a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more. It can be seen that they both have. Further, in Examples, it can be seen that Example 1 to which Sr is added has higher tensile strength and elongation than Example 4 to which Sr is not added (the content of Sr is extremely small).
Ｓｉ、Ｃｕ及びＭｎの含有量が多い比較例１～比較例５の組成を有するアルミニウム合金鋳物材は高い０．２％耐力を示しているが、破断伸びが２．０％以下となっている。また、Ｆｅの含有量が多い比較例６～比較例１０、比較例１３～１９の組成を有するアルミニウム合金鋳物材も破断伸びが２．５％に達していない。
The aluminum alloy castings having the compositions of Comparative Examples 1 to 5 having a high content of Si, Cu and Mn show a high 0.2% proof stress, but the breaking elongation is 2.0% or less. .. Further, the aluminum alloy castings having the compositions of Comparative Examples 6 to 10 and Comparative Examples 13 to 19 having a high Fe content also do not reach 2.5% in elongation at break.
また、Ｍｇの添加量が少なくＺｎを含んでいない比較例１１及びＭｇの添加量が少ない比較例１２の組成を有するアルミニウム合金鋳物材の硬度は低い値となっており、十分な強度が得られていないことが分かる。
Further, the hardness of the aluminum alloy casting material having the compositions of Comparative Example 11 in which the amount of Mg added is small and does not contain Zn and Comparative Example 12 in which the amount of Mg added is small is a low value, and sufficient strength can be obtained. You can see that it is not.
更に、Ｓｉ及びＣｕの含有量が少ない比較例２０の組成を有するアルミニウム合金鋳物材は２．５％以上の破断伸びを有しているが、０．２％耐力が低い値となっている。また、ＳｉとＺｎの含有量が少なく、ＣｕとＭｎの含有量が多い比較例２１は、高い引張強度と０．２％耐力を有しているが、破断伸びが２．５％未満と低い値となっている。また、ＣｕとＭｎの含有量が多い比較例２２は、破断伸びが２．５％未満と低い値となっていることに加え、０．２％耐力も２３０ＭＰａに達していない。
Further, the aluminum alloy casting material having the composition of Comparative Example 20 having a low content of Si and Cu has a breaking elongation of 2.5% or more, but has a low proof stress of 0.2%. Further, Comparative Example 21 having a low content of Si and Zn and a high content of Cu and Mn has high tensile strength and 0.2% proof stress, but has a low breaking elongation of less than 2.5%. It is a value. Further, in Comparative Example 22 in which the contents of Cu and Mn are high, the elongation at break is as low as less than 2.5%, and the 0.2% proof stress does not reach 230 MPa.
以上の結果より、アルミニウム合金鋳物材に熱処理を施すことなく２３０ＭＰａ以上の０．２％耐力と２．５％以上の破断伸びを発現させるためには、Ｓｉ、Ｃｕ、Ｍｇ、Ｆｅ、Ｍｎ及びＺｎの添加量を厳密に制御することが必要であることが分かる。
From the above results, in order to develop a 0.2% proof stress of 230 MPa or more and a breaking elongation of 2.5% or more without heat treatment of the aluminum alloy casting material, Si, Cu, Mg, Fe, Mn and Zn It can be seen that it is necessary to strictly control the amount of zinc added.
Claims (3)
- Ｓｉ：７．０～９．０質量％、
Ｃｕ：２．０～４．０質量％、
Ｍｇ：０．８～１．２質量％、
Ｆｅ：０．３～０．５質量％、
Ｍｎ：０．３～０．５質量％、
Ｚｎ：２．０～４．０質量％、を含み、
残部がＡｌ及び不可避不純物よりなること、
を特徴とするアルミニウム合金。 Si: 7.0-9.0 mass%,
Cu: 2.0-4.0% by mass,
Mg: 0.8-1.2% by mass,
Fe: 0.3 to 0.5% by mass,
Mn: 0.3 to 0.5% by mass,
Zn: 2.0 to 4.0% by mass, including
The balance consists of Al and unavoidable impurities,
Aluminum alloy featuring. - Ｓｒ：０．００８～０．０４質量％、
Ｂｅ：０．００１～０．００４質量％、
Ｔｉ：０．０５～０．００５質量％、
Ｂ：０．０１～０．００５質量％、
のうちのいずれか一種以上を含むこと、
を特徴とする請求項１に記載のアルミニウム合金。 Sr: 0.008 to 0.04% by mass,
Be: 0.001 to 0.004% by mass,
Ti: 0.05 to 0.005% by mass,
B: 0.01 to 0.005% by mass,
Including any one or more of
The aluminum alloy according to claim 1. - 請求項１又は請求項２に記載のアルミニウム合金からなり、
０．２％耐力が２３０ＭＰａ以上であり、
破断伸びが２．５％以上であること、
を特徴とするアルミニウム合金鋳物材。 It is made of the aluminum alloy according to claim 1 or 2.
0.2% proof stress is 230MPa or more,
The breaking elongation is 2.5% or more,
Aluminum alloy casting material characterized by.
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| JP2020509232A (en) * | 2017-02-17 | 2020-03-26 | ジエーエムカンパニー リミテッドＧａｍ Ｃｏ．，Ｌｔｄ． | High-strength aluminum alloy and high-strength aluminum alloy casting |
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