JP4665413B2 - Cast aluminum alloy with high rigidity and low coefficient of linear expansion - Google Patents

Cast aluminum alloy with high rigidity and low coefficient of linear expansion Download PDF

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JP4665413B2
JP4665413B2 JP2004084256A JP2004084256A JP4665413B2 JP 4665413 B2 JP4665413 B2 JP 4665413B2 JP 2004084256 A JP2004084256 A JP 2004084256A JP 2004084256 A JP2004084256 A JP 2004084256A JP 4665413 B2 JP4665413 B2 JP 4665413B2
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mass
linear expansion
aluminum alloy
expansion coefficient
rigidity
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JP2005272868A5 (en
JP2005272868A (en
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和宏 織田
正彦 塩田
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Nippon Light Metal Co Ltd
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Priority to MYPI20051266A priority patent/MY139116A/en
Priority to US10/593,338 priority patent/US20070193663A1/en
Priority to EP05726972.2A priority patent/EP1728882B1/en
Priority to KR1020067021516A priority patent/KR20060130753A/en
Priority to PCT/JP2005/005225 priority patent/WO2005090624A2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0605—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two belts, e.g. Hazelett-process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • 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
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Body Structure For Vehicles (AREA)
  • Continuous Casting (AREA)

Description

本発明は、鋳造用アルミニウム合金に関し、特に自動車等各種車両のラダー型フレーム、ペリメータ型フレームやケース類のように、特に高剛性と低線膨張率を必要とされる部材の鋳造に好適に用いることができる鋳造用アルミニウム合金に関するものである。   The present invention relates to an aluminum alloy for casting, and particularly suitably used for casting a member requiring high rigidity and a low linear expansion coefficient, such as a ladder type frame, a perimeter type frame, and cases of various vehicles such as automobiles. The present invention relates to an aluminum alloy for casting.

従来、自動車のフレームのように特に高い剛性が必要とされる部材には鋳鉄が使用されてきたが、近年は、省エネルギーの観点から自動車の軽量化の要求が高まり、この要求に答えうる材料としてアルミニウム合金が注目されている。   Conventionally, cast iron has been used for members that require particularly high rigidity, such as automobile frames, but in recent years, there has been an increasing demand for weight reduction of automobiles from the viewpoint of energy saving. Aluminum alloys are attracting attention.

高い剛性を有するアルミニウム合金としては、アルミニウム合金中に、強化材としてAl2O3やSiC等を複合させたアルミニウム合金複合材が知られているが、これらの複合材は、製造工程が複雑でコスト高になる問題がある。また、Al2O3やSiC等を含んでいるためにリサイクル時に制約が多い等の問題もある。 As aluminum alloys having high rigidity, aluminum alloy composite materials in which Al 2 O 3 or SiC is compounded as a reinforcing material in an aluminum alloy are known, but these composite materials have complicated manufacturing processes. There is a problem of high costs. In addition, since Al 2 O 3 and SiC are included, there are problems such as many restrictions during recycling.

特開平１−１８０９３８号公報は、耐摩耗性を向上させたアルミニウム合金を開示したものであるが、ここに開示されたアルミニウム合金は、自動車のフレーム等に使用されている鋳鉄品と置換しようとした場合には、剛性が小さく、線膨張係数が大きすぎる問題が有る。また、特開平３−１９９３３６号公報も同様に耐摩耗性を向上させたアルミニウム合金を開示したものであるが、ここに開示されたアルミニウム合金もまた自動車のフレーム等に使用されている鋳鉄品と置換しようとした場合には、剛性が小さく、線膨張係数が大きすぎ、さらに金型への焼きつきが起こり易いという問題もある。
特開平１−１８０９３８号公報 特開平３−１９９３３６号公報 Japanese Laid-Open Patent Publication No. 1-180938 discloses an aluminum alloy with improved wear resistance, but the aluminum alloy disclosed herein is intended to replace cast iron products used in automobile frames and the like. In such a case, there is a problem that the rigidity is small and the linear expansion coefficient is too large. Japanese Laid-Open Patent Publication No. 3-199336 also discloses an aluminum alloy with improved wear resistance. The aluminum alloy disclosed herein is also a cast iron product used in automobile frames and the like. When the replacement is attempted, there is a problem that the rigidity is small, the linear expansion coefficient is too large, and seizure to the mold is likely to occur.
Japanese Patent Laid-Open No. 1-180938 Japanese Patent Laid-Open No. 3-199336

従来のアルミニウム合金が有する上記のような問題を解決するため、本発明は、Si：１３〜２５質量％、Cu：２〜８質量％、Fe：０．５〜３質量％、Mn：０．３〜３．５質量％、P：０．００１〜０．０２質量％を含み、残部がAlと不可避的不純物からなり、FeとMnの合計量が３．０質量％以上であることを特徴とする剛性に優れ、低線膨張率を有する鋳造用アルミニウム合金を提案する。 In order to solve the above-mentioned problems of conventional aluminum alloys, the present invention is based on Si: 13 to 25% by mass, Cu: 2 to 8% by mass, Fe: 0.5 to 3% by mass, Mn: 0.00. 3 to 3.5 % by mass, P: 0.001 to 0.02% by mass, the balance is made of Al and inevitable impurities, and the total amount of Fe and Mn is 3.0% by mass or more. An aluminum alloy for casting having excellent rigidity and low linear expansion coefficient is proposed.

さらに、Fe、MnおよびNiの合計量が３．０質量％以上となるようにNi：０．５〜６質量％を加えても良い。   Furthermore, you may add Ni: 0.5-6 mass% so that the total amount of Fe, Mn, and Ni may be 3.0 mass% or more.

さらに、上記Niに代えて、あるいはNiに加えて、Cr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％、Ti：０．０１〜１．０質量％、B:０．０００１〜１．０質量％、Zr：０．１〜１．０質量％、V：０．１〜１．０質量％、Mo：０．０１〜１．０質量％の何れか１種以上を含んでも良い。   Further, instead of Ni or in addition to Ni, Cr: 0.1 to 1.0 mass%, Mg: 0.05 to 1.5 mass%, Ti: 0.01 to 1.0 mass%, B: Any of 0.0001 to 1.0 mass%, Zr: 0.1 to 1.0 mass%, V: 0.1 to 1.0 mass%, Mo: 0.01 to 1.0 mass% One or more kinds may be included.

本発明の合金は、冷却速度３０°Ｃ／秒以上で鋳造することが好ましく、高い冷却速度で鋳造するためにはダイカスト法で鋳造することが好ましい。   The alloy of the present invention is preferably cast at a cooling rate of 30 ° C./second or more, and is preferably cast by a die casting method in order to cast at a high cooling rate.

本発明の発明者は、アルミニウム合金について鋭意研究を行った結果、晶出物の面積率とアルミニウム合金の剛性および線膨張係数に相関があることを発見し、さらに研究を行った結果、上述の合金組成にすることにより、鋳造時にAl-Ni系、Al-Ni-Cu系、Al-Cu系、Al-Fe-Si系、Al-Fe-Mn系あるいはAl-Si-Fe-Mn系化合物の微細な晶出粒子を分散させることができ、必要とする高剛性および低線膨張率を実現できることを発見した。以下に、各成分の当該アルミニウム合金における作用について述べる。   The inventors of the present invention have conducted extensive research on aluminum alloys, and as a result, found that there is a correlation between the crystallized area ratio and the rigidity and linear expansion coefficient of the aluminum alloy. By adopting an alloy composition, Al-Ni, Al-Ni-Cu, Al-Cu, Al-Fe-Si, Al-Fe-Mn, or Al-Si-Fe-Mn compounds can be used during casting. It was discovered that fine crystallized particles can be dispersed, and the required high rigidity and low linear expansion coefficient can be realized. Below, the effect | action in the said aluminum alloy of each component is described.

Si：１３〜２５質量％
Siは、共晶Si、初晶Si、Al-Fe-Si系化合物として晶出し、剛性を向上させる作用がある。この効果は１３質量％以上で顕著となるが、２５質量％を超えると初晶Siが粗大化して、逆に剛性向上効果が低下する。また、鋳造温度を向上させる必要がある。更に、粗大Siによって切削加工性が著しく悪化する。Siには、線膨張率を低下させる作用、耐摩耗性を向上させる作用もある。Siのより好ましい範囲は、１３〜１７質量％である。 Si: 13-25% by mass
Si is crystallized as a eutectic Si, primary Si, or Al—Fe—Si compound, and has the effect of improving rigidity. This effect becomes prominent at 13% by mass or more, but when it exceeds 25% by mass, the primary crystal Si is coarsened, and the rigidity improving effect is reduced. Moreover, it is necessary to improve casting temperature. Furthermore, the machinability is remarkably deteriorated by coarse Si. Si also has the effect of reducing the coefficient of linear expansion and improving the wear resistance. A more preferable range of Si is 13 to 17% by mass.

Cu：２〜８質量％
Cuは、Al-Cu系、Al-Ni-Cu系化合物として晶出し、剛性の向上に寄与する。この作用は４質量％以上の添加で顕著となるが、８質量％を超えると化合物が粗大化して逆に伸びが低下し、さらに耐食性も低下する。Cuのより好ましい範囲は３〜６質量％である。 Cu: 2 to 8% by mass
Cu crystallizes out as an Al-Cu-based or Al-Ni-Cu-based compound and contributes to improvement in rigidity. This effect becomes prominent when added in an amount of 4% by mass or more. However, when the content exceeds 8% by mass, the compound is coarsened to decrease the elongation, and the corrosion resistance also decreases. A more preferable range of Cu is 3 to 6% by mass.

Fe＋Mn（＋Ni）：３．０質量％以上
Fe、Mn、Niは、Al-Fe-Mn系、Al-Fe-Si系、Al-Ni系、Al-Ni-Cu系、Al-Ni-Fe-Mn系、Al-Si-Fe-Mn系化合物として晶出し、剛性の向上に寄与し、線膨張係数を低下させる作用がある。また、耐熱性を向上させる作用もある。この作用は、Fe＋Mn（＋Ni）が３質量％以上で顕著となるが、１２質量％を超えると晶出物が粗大化し、逆に剛性向上効果が小さくなるので、Fe＋Mn＋Niは合計で１２質量％以下にするのが好ましい。 Fe + Mn (+ Ni): 3.0% by mass or more
Fe, Mn, Ni are Al-Fe-Mn, Al-Fe-Si, Al-Ni, Al-Ni-Cu, Al-Ni-Fe-Mn, Al-Si-Fe-Mn It crystallizes out as a compound, contributes to the improvement of rigidity, and has the effect of reducing the linear expansion coefficient. It also has the effect of improving heat resistance. This effect becomes significant when Fe + Mn (+ Ni) is 3% by mass or more, but when it exceeds 12% by mass, the crystallized material becomes coarse, and conversely the effect of improving the rigidity is reduced. Therefore, Fe + Mn + Ni is 12% by mass or less in total. Is preferable.

P：０．００１〜０．０２
Pは、初晶Siを微細化して均一に分散させる作用を有する。この作用は、０．００１質量％以上で顕著であるが、０．０２質量％を超えると溶湯の粘性が増加し、鋳造性が悪くなる。 P: 0.001 to 0.02
P has the effect of making primary crystal Si fine and uniformly dispersing. This effect is remarkable at 0.001% by mass or more, but when it exceeds 0.02% by mass, the viscosity of the molten metal increases and the castability deteriorates.

Mg：０．０５〜１．５質量％
Mgは、母相中に固溶し、剛性の向上に寄与する。この作用は、０．０５質量％以上で顕著であるが、１．５質量％を越えると伸びが低下し、鋳造性が著しく悪化する。さらに好ましくは、Mgは０．４質量％以下である。 Mg: 0.05 to 1.5% by mass
Mg dissolves in the matrix and contributes to the improvement of rigidity. This effect is remarkable at 0.05% by mass or more, but when it exceeds 1.5% by mass, the elongation is lowered and the castability is remarkably deteriorated. More preferably, Mg is 0.4 mass% or less.

Cr：０．１〜１．０質量％
Crは、Al-Si-Fe-Mn-Cr系化合物として晶出し、剛性の向上に寄与する。また、初晶Siを微細且つ均一に分散させる作用をも有する。当該作用は、Crが０．１質量％以上で顕著であるが、１．０質量％を超えると粗大な化合物が形成され、逆に伸びが低下する。 Cr: 0.1-1.0% by mass
Cr crystallizes out as an Al-Si-Fe-Mn-Cr compound and contributes to the improvement of rigidity. It also has the function of dispersing primary crystal Si finely and uniformly. The effect is remarkable when Cr is 0.1% by mass or more, but when it exceeds 1.0% by mass, a coarse compound is formed, and the elongation is reduced.

Ti：０．０１〜１．０質量％
Tiは、α相を微細化し、鋳造性の向上に寄与するとともに、Al-Ni系化合物の粗大かを防止する作用がある。その作用は、Tiが０．０１質量％以上で顕著となるが、１．０質量％を超えると粗大な化合物が形成され、逆に伸びが低下する。 Ti: 0.01 to 1.0% by mass
Ti refines the α phase, contributes to the improvement of castability, and has the effect of preventing the coarseness of the Al—Ni compound. The effect becomes significant when Ti is 0.01% by mass or more, but when it exceeds 1.0% by mass, a coarse compound is formed, and the elongation is reduced.

B:０．０００１〜１．０質量％、V：０．１〜１．０質量％、Zr：０．１〜１．０質量％、Mo：０．０１〜１．０質量％
B、V、Zr、Moは、高剛性晶出物を形成し、剛性の向上に寄与する。何れの元素も上限を超えて添加すると粗大な晶出物を形成して、伸びが低下する。 B: 0.0001 to 1.0 mass%, V: 0.1 to 1.0 mass%, Zr: 0.1 to 1.0 mass%, Mo: 0.01 to 1.0 mass%
B, V, Zr, and Mo form a highly rigid crystallized product and contribute to the improvement of rigidity. If any element is added in excess of the upper limit, a coarse crystallized product is formed and elongation is lowered.

本出願の発明者は、本発明にかかるアルミニウム合金を製造し、組成と結晶構造及び剛性と線膨張係数との関係について実験的に確認したので、その結果を以下に述べる。
実験に用いたアルミニウム合金の組成を表１に示す。実験に用いたアルミニウム合金は、PFダイカスト法により、鋳造温度７２０°Ｃで２００×２００×１０ｍｍの平板形状に鋳造した後、２００°Ｃで４時間保持して時効させた後、剛性（ヤング率）と線膨張係数（熱膨張係数）を測定した。合金Ｎｏ．１〜１７は本発明に基づくアルミニウム合金、合金Ｎｏ．１８〜２４は、組成の範囲のうちの少なくとも１つが上述の条件を満たさない比較例である。条件を満足していない組成には下線を引いて示した。

Figure 0004665413
The inventor of the present application manufactured the aluminum alloy according to the present invention and experimentally confirmed the relationship between the composition, the crystal structure, the rigidity, and the linear expansion coefficient, and the results will be described below.
Table 1 shows the composition of the aluminum alloy used in the experiment. The aluminum alloy used in the experiment was cast into a flat plate shape of 200 × 200 × 10 mm at a casting temperature of 720 ° C. by the PF die casting method, and then was aged by holding at 200 ° C. for 4 hours. ) And linear expansion coefficient (thermal expansion coefficient). Alloy No. 1 to 17 are aluminum alloys and alloy nos. 18 to 24 are comparative examples in which at least one of the composition ranges does not satisfy the above-described conditions. Compositions that do not satisfy the conditions are shown underlined.
Figure 0004665413

上記の測定結果を、表１に、組成とともに示す。
ここでは、ヤング率に関しては基準値を９０ＧＰａとして、これ以上のものが基準を満足すると判断し、線膨張係数については基準値を１８×１０−６／°Ｃとして、これ未満のものが基準を満足すると判断した。
表１に示されているように、合金Ｎｏ．１８は、ヤング率が８０ＧＰａと基準値（９０ＧＰａ）を下回っており、同時に、線膨張係数は２０．０×１０−６／°Ｃと基準値（１８×１０−６／°Ｃ）より大きく、何れの値も基準を満足していない。これは、Si、Cu、Ni＋Fe＋Mnの含有量が何れも不十分である、つまり上述の範囲を下回っていることが原因であると考えられる。 The measurement results are shown in Table 1 together with the composition.
Here, regarding the Young's modulus, the reference value is set to 90 GPa, and it is determined that more than this satisfies the standard, and the linear expansion coefficient is set to 18 × 10 −6 / ° C., and the value below this is the reference. I was satisfied.
As shown in Table 1, alloy no. 18 has a Young's modulus of 80 GPa, which is lower than the reference value (90 GPa), and at the same time, the linear expansion coefficient is 20.0 × 10 −6 / ° C., which is larger than the reference value (18 × 10 −6 / ° C.). Neither value satisfies the standard. This is considered to be due to the fact that the contents of Si, Cu, Ni + Fe + Mn are all insufficient, that is, the content is below the above range.

合金Ｎｏ．１９もまた、合金Ｎｏ．１８と同様に、ヤング率、線膨張係数ともに基準を満足していない。これは、Cuについては上述の範囲に入っているものの、SiとNi＋Fe＋Mnの含有量が何れも不十分である（上述の範囲を下回っている）ことが原因であると考えられる。   Alloy No. 19 is also alloy no. As with 18, the Young's modulus and linear expansion coefficient do not satisfy the standards. This is considered to be caused by the fact that the contents of Si and Ni + Fe + Mn are both insufficient (below the above range) although Cu is within the above range.

合金Ｎｏ．２０は、ヤング率が基準値よりも低いが、これはNi＋Fe＋Mnの含有量が合計２．０質量％であって、上述の条件、Ni＋Fe＋Mn３．０質量％を下回っていることが原因と考えられる。   Alloy No. No. 20 has a Young's modulus lower than the reference value, which is considered to be because the total content of Ni + Fe + Mn is 2.0% by mass, which is lower than the above condition, Ni + Fe + Mn 3.0% by mass.

合金Ｎｏ．２１は、ヤング率と線膨張係数は基準を満足しているが、金型に焼きつきを生じた。これは、Feが実質的に添加されておらず、上述の条件を満足していなかったことが原因と考えられる。   Alloy No. In No. 21, the Young's modulus and linear expansion coefficient satisfied the standard, but the mold was seized. This is considered to be because Fe was not substantially added and the above-mentioned conditions were not satisfied.

合金Ｎｏ．２２は、延びが不十分で、弾性変形領域内で試験片が割れてしまったためにヤング率を測定することができなかった。これは、Mnが実質的に添加されておらず、組成に関する上述の条件を満足していないためと考えられる。   Alloy No. In No. 22, the Young's modulus could not be measured because the elongation was insufficient and the test piece was cracked in the elastic deformation region. This is presumably because Mn was not substantially added and the above-mentioned conditions regarding the composition were not satisfied.

合金Ｎｏ．２３は、ヤング率、線膨張係数ともに基準を満足していない。これは、Cuが１質量％では不十分である（上述の範囲を下回っている）ことが原因であると考えられる。   Alloy No. No. 23 does not satisfy the standards for both Young's modulus and linear expansion coefficient. This is considered to be caused by the fact that 1% by mass of Cu is insufficient (below the above range).

合金Ｎｏ．２４もまた、ヤング率、線膨張係数ともに基準を満足していない。これは、Siが１２質量％では不十分である（上述の範囲を下回っている）ことが原因であると考えられる。   Alloy No. No. 24 also does not satisfy the standards in terms of Young's modulus and linear expansion coefficient. This is considered to be caused by the fact that Si is insufficient at 12% by mass (below the above range).

これに対して、上述の組成範囲を満足する本発明のアルミニウム合金Ｎｏ．１〜１７は、表１に示されている予に何れも、ヤング率および線膨張係数の値が基準を満足している。   In contrast, the aluminum alloy No. 1 of the present invention satisfying the above composition range. 1 to 17 all have the Young's modulus and the coefficient of linear expansion satisfy the criteria, as shown in Table 1.

本発明の鋳造用アルミニウム合金は、特に自動車等各種車両のラダー型フレーム、ペリメータ型フレームやケース類のように、特に高剛性と低線膨張率を必要とされる部材の鋳造に好適に用いることができる。     The casting aluminum alloy of the present invention is particularly suitable for casting of members that require high rigidity and low linear expansion coefficient, such as ladder type frames, perimeter type frames and cases of various vehicles such as automobiles. Can do.

Claims (4)

Si：１３〜２５質量％、Cu：２〜８質量％、Fe：０．５〜３質量％、Mn：０．３〜３．５質量％、P：０．００１〜０．０２質量％を含み、さらに、Cr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％、Ti：０．０１〜１．０質量％、B:０．０００１〜１．０質量％、Zr：０．１〜１．０質量％、V：０．１〜１．０質量％、Mo：０．０１〜１．０質量％の何れか１種以上を含み、且つCr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％のうち少なくとも一方を含み、残部がAlと不可避的不純物からなり、FeとMnの合計量が３．０質量％以上であることを特徴とする剛性に優れ、低線膨張率を有する鋳造用アルミニウム合金。 Si: 13-25 mass%, Cu: 2-8 mass%, Fe: 0.5-3 mass%, Mn: 0.3-3.5 mass%, P: 0.001-0.02 mass% In addition, Cr: 0.1 to 1.0 mass%, Mg: 0.05 to 1.5 mass%, Ti: 0.01 to 1.0 mass%, B: 0.0001 to 1.0 mass% %, Zr: 0.1 to 1.0% by mass, V: 0.1 to 1.0% by mass, Mo: 0.01 to 1.0% by mass, and Cr: 0 0.1-1.0% by mass, Mg: at least one of 0.05-1.5% by mass, the balance being made of Al and inevitable impurities, the total amount of Fe and Mn being 3.0% by mass or more An aluminum alloy for casting having excellent rigidity and low coefficient of linear expansion, characterized by being Si：１３〜２５質量％、Cu：２〜８質量％、Fe：０．５〜３質量％、Mn：０．３〜３．５質量％、Ni：０．５〜６質量％、P:０．００１〜０．０２質量％を含み、さらに、Cr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％、Ti：０．０１〜１．０質量％、B:０．０００１〜１．０質量％、Zr：０．１〜１．０質量％、V：０．１〜１．０質量％、Mo：０．０１〜１．０質量％の何れか１種以上を含み、且つCr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％のうち少なくとも一方を含み、残部がAlと不可避的不純物からなり、Fe、MnおよびNiの合計量が３．０質量％以上であることを特徴とする剛性に優れ、低線膨張率を有する鋳造用アルミニウム合金。 Si: 13-25 mass%, Cu: 2-8 mass%, Fe: 0.5-3 mass%, Mn: 0.3-3.5 mass%, Ni: 0.5-6 mass%, P: 0.001-0.02% by mass, further Cr: 0.1-1.0% by mass, Mg: 0.05-1.5% by mass, Ti: 0.01-1.0% by mass, B: Any of 0.0001 to 1.0 mass%, Zr: 0.1 to 1.0 mass%, V: 0.1 to 1.0 mass%, Mo: 0.01 to 1.0 mass% 1 or more types, Cr: 0.1-1.0 mass%, Mg: At least one is included among 0.05-1.5 mass%, The remainder consists of Al and an unavoidable impurity, Fe, Mn An aluminum alloy for casting having excellent rigidity and a low linear expansion coefficient, characterized in that the total amount of Ni and Ni is 3.0% by mass or more. Si：１３〜２５質量％、Cu：２〜８質量％、Fe：０．５〜３質量％、Mn：０．３〜３．５質量％、P：０．００１〜０．０２質量％を含み、且つCr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％のうち少なくとも一方を含み、残部がAlと不可避的不純物からなり、FeとMnの合計量が３．０質量％以上であることを特徴とする剛性に優れ、低線膨張率を有する鋳造用アルミニウム合金。 Si: 13-25 mass%, Cu: 2-8 mass%, Fe: 0.5-3 mass%, Mn: 0.3-3.5 mass%, P: 0.001-0.02 mass% And Cr: 0.1 to 1.0% by mass, Mg: 0.05 to 1.5% by mass, the balance is made of Al and inevitable impurities, and the total amount of Fe and Mn is An aluminum alloy for casting having excellent rigidity and low linear expansion coefficient, characterized by being 3.0% by mass or more. Si：１３〜２５質量％、Cu：２〜８質量％、Fe：０．５〜３質量％、Mn：０．３〜３．５質量％、Ni：０．５〜６質量％、P:０．００１〜０．０２質量％を含み、且つCr：０．１〜１．０質量％、Mg：０．０５〜１．５質量％のうち少なくとも一方を含み、残部がAlと不可避的不純物からなり、Fe、MnおよびNiの合計量が３．０質量％以上であることを特徴とする剛性に優れ、低線膨張率を有する鋳造用アルミニウム合金。 Si: 13-25 mass%, Cu: 2-8 mass%, Fe: 0.5-3 mass%, Mn: 0.3-3.5 mass%, Ni: 0.5-6 mass%, P: 0.001 to 0.02% by mass, Cr: 0.1 to 1.0% by mass, Mg: 0.05 to 1.5% by mass, the balance being Al and inevitable impurities An aluminum alloy for casting having excellent rigidity and low linear expansion coefficient, characterized in that the total amount of Fe, Mn and Ni is 3.0% by mass or more.
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