JP4703033B2 - Aluminum alloy material for die casting - Google Patents
Aluminum alloy material for die casting Download PDFInfo
- Publication number
- JP4703033B2 JP4703033B2 JP2001150775A JP2001150775A JP4703033B2 JP 4703033 B2 JP4703033 B2 JP 4703033B2 JP 2001150775 A JP2001150775 A JP 2001150775A JP 2001150775 A JP2001150775 A JP 2001150775A JP 4703033 B2 JP4703033 B2 JP 4703033B2
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- JP
- Japan
- Prior art keywords
- strength
- aluminum alloy
- alloy material
- die casting
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【0001】
【発明の属する技術分野】
本発明は高温強度及び耐食性に優れたダイカスト用アルミニウム合金材に関するものであり、詳しくは高温での強度が要求されるヒーター部品等、或いは高温強度と共に耐食性が要求される給湯器部品等の材料として利用するのに有用なアルミニウム合金材に関するものである。
【0002】
【従来の技術】
ダイカスト用JISアルミニウム合金で、最も広く用いられているADC12は、常温での強度が優れており、一般に様々なアルミニウムダイカスト製品に用いられている。しかし、このADC12は、300℃を超える様な高温領域ではその強度は弱く、例えばヒーター部品等の高温下での強度が要求される部品に対しては、その強度は不十分である。また、ADC12はその成分中にCuを含有しているため耐食性が悪く、例えば給湯器部品等には適用できない。
【0003】
【発明が解決しようとする課題】
本発明の目的は、300℃を超える高温領域で高い強度を有し、且つ耐食性にも優れたダイカスト用アルミニウム合金材を提供することにある。
【0004】
【課題を解決するための手段】
本発明者らは、300℃を超える高温領域での高い強度を確保し、しかも良好な耐食性を確保したダイカスト用アルミニウム合金材を目的として、アルミニウム合金に添加される成分元素について種々検討した結果、所定量のSi、Mg、Mn、Feを添加した合金が有用であることを見出し本発明に達した。即ち、本発明の要旨は、Si 0.4〜3.00wt%、Mg 0.15〜1.2wt%、Mn 0.3〜2.0wt%、及びFe 0.2〜1.0wt%を含有し、残部アルミニウムおよび不可避的不純物からなることを特徴とするダイカスト用アルミニウム合金材に存する。
【0005】
【発明の実施の形態】
以下、本発明を詳細に説明する。
本発明のダイカスト用アルミニウム合金材は、上記の特定元素を所定量含有させることにより、最も代表的なダイカスト用アルミニウム合金材として各種製品に汎用されているADC12に比べ、かなり高い温度領域でも高い強度を有し、更に良好な耐食性をも有する優れた特性のアルミニウム合金材である。
具体的には、本発明のアルミニウム合金材は、300℃以上の高温下での強さ、つまり、高温にさらされた時の材料変形に対する耐力が優れていることが特に重要で、物性値として0.2%耐力がADC12のそれを上回るものであり、又ADC12よりも優れた耐食性を有するのである。
【0006】
本発明のアルミニウム合金材にはCuは添加されず、添加される特定成分元素は、Si、Mg、Mn及びFeである。これらの成分中、Feは合金と金型との焼付き防止のために添加されるものであり、他のSi、Mg及びMnは、これらの所定量を同時に添加することによる相乗作用によって、高温領域における合金の強度、即ち耐熱性と強さを高めるのである。特に、従来の合金からSi添加量を大幅に減らし、且つMg、Mnを添加することで耐熱性、及び強度を向上させ得ることは本発明者らの新規な知見に基づくのである。そして、本発明のアルミニウム合金材は、ADC12とは異なり、耐食性を悪化させるが耐熱性と強さに寄与するCuを添加することなく高い強度を確保しているのである。
【0007】
本発明のアルミニウム合金材におけるSi添加量は、0.25〜3.0wt%、好ましくは0.4〜2.0wt%の範囲で適宜選定する。添加量が0.25wt%未満では強度が十分でない。他方、3.0wt%を超えて添加しても、強度の向上には寄与しない。
【0008】
Mg添加量は、0.15〜1.2wt%、好ましくは0.25〜1.0wt%の範囲で適宜選定する。添加量が0.15wt%未満では強度が十分でない。他方、1.2wt%を超えて添加した場合、強度の向上には寄与するが、ダイカスト鋳造時の湯流れ性が低下する弊害が生じやすい。
【0009】
Mn添加量は、0.3〜3.0wt%、好ましくは0.5〜2.0wt%の範囲で適宜選定する。添加量が0.3wt%未満では強度が十分でない。他方、3.0wt%を超えて添加した場合、後述の比較例から明らかなように合金の靱性が低下する。引張試験での伸びが10%を下回ると、変形応力が加わった際、割れの懸念が生じる。
【0010】
Feは従来のダイカスト用JIS合金にも添加されているように、アルミニウム合金と金型の焼付きを防止するために添加される。添加量が0.2wt%未満では焼付き防止効果は十分ではなく、また1.0wt%を超えて添加しても、その効果は1.0wt%以下の場合と変わらず、靱性の低下を招くだけである。このため、Feの添加量は、0.2〜1.0wt%、好ましくは0.3〜0.7wt%の範囲で適宜選定する。
【0011】
本発明のアルミニウム合金材は、上記の合金成分の他、不可避的不純物を含有するが、本発明合金材の特性を損なわない限り、必要に応じ他の特性の改善、例えば、金属組織微細化等のために添加される成分を含んでいても良い。そのような成分としては、例えば、Zn、Ni、Zr、Cr、Ti、B、Sn、In、Ca、Sr、Na等が挙げられるが、これらの成分は過剰の添加により合金の強度または靱性を低下させるおそれがあるので、0.5wt%以下とすることが必要である。
【0012】
本発明のアルミニウム合金材は、高温領域において従来のダイカスト用JIS合金ADC12より高い強度、並びに優れた耐食性を有しており、高温強度を要求されるヒーター部品等、或いは高温強度とともに耐食性が要求される給湯器部品等の材料として利用することが出来る極めて有用な合金材である。
【0013】
【実施例】
以下に本発明を実施例により更に詳細に説明するが、本発明はその要旨を超えない限り以下の実施例により制限されるものではない。
[実施例および比較例]
下記表1に示した各組成の合金を舟型形状の金型に鋳造した。得られた鋳塊の350℃における高温引張試験を実施し、機械的性質を評価した。
合金調製用のアルミニウムとしては純度99.8wt%のものを用い、比較例合金No.10としてADC12を用いた。
尚、引張試験は、JIS Z2201に従って行った。
試験測定の結果、本発明実施例の合金では、引張強度、及び0.2%耐力のいずれにおいてもADC12より優れていることが明らかである。
【0014】
【表1】
【0015】
又、上記に得られた鋳塊(実施例)及びADC12(比較例)を用いて、塩水腐食試験を行いその結果を下記表2に示した。
塩水腐食試験は、各合金の試験片(20×80mm)を各々1ケ5%食塩水溶液に室温(20℃)で30日間浸漬し、腐食による減量を測定し、評価した。ADC12と比較して、本発明の実施例の合金はいずれも腐食減量が大幅に少なく、耐食性に優れていることが判る。
【0016】
【表2】
【0017】
【発明の効果】
本発明のダイカスト用アルミニウム合金を利用することで、高温強度に優れたヒーター用部品等、或いは高温強度と耐食性に優れた給湯器部品等を提供することができるので、工業的価値は大きい。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum alloy material for die casting excellent in high-temperature strength and corrosion resistance. Specifically, as a material for heater parts that require high-temperature strength, or water heater parts that require high-temperature strength and corrosion resistance. The present invention relates to an aluminum alloy material useful for use.
[0002]
[Prior art]
The most widely used ADC12, which is a JIS aluminum alloy for die casting, has excellent strength at room temperature, and is generally used in various aluminum die casting products. However, the strength of the ADC 12 is weak in a high temperature region exceeding 300 ° C., and the strength is insufficient for a part that requires strength at a high temperature such as a heater part. Moreover, since ADC12 contains Cu in its components, it has poor corrosion resistance and cannot be applied to, for example, water heater parts.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide an aluminum alloy material for die casting having high strength in a high temperature region exceeding 300 ° C. and excellent corrosion resistance.
[0004]
[Means for Solving the Problems]
As a result of various investigations regarding the component elements added to the aluminum alloy for the purpose of an aluminum alloy material for die casting that has secured high strength in a high temperature region exceeding 300 ° C. and has ensured good corrosion resistance, The inventors have found that an alloy to which a predetermined amount of Si, Mg, Mn and Fe is added is useful, and reached the present invention. That is, the gist of the present invention is that Si 0.4 to 3.00 wt%, Mg 0.15 to 1.2 wt%, Mn 0.3 to 2.0 wt%, and Fe 0.2 to 1.0 wt%. It exists in the aluminum alloy material for die-casting characterized by consisting of remainder aluminum and an unavoidable impurity.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The aluminum alloy material for die casting of the present invention contains a specific amount of the above-mentioned specific element, so that it has a high strength even in a considerably high temperature range as compared with ADC12 widely used for various products as the most typical aluminum alloy material for die casting. It is an aluminum alloy material having excellent characteristics and having good corrosion resistance.
Specifically, it is particularly important that the aluminum alloy material of the present invention has excellent strength at high temperatures of 300 ° C. or higher, that is, excellent resistance to material deformation when exposed to high temperatures. The 0.2% proof stress is higher than that of the ADC 12 and has better corrosion resistance than the ADC 12.
[0006]
Cu is not added to the aluminum alloy material of the present invention, and the specific component elements to be added are Si, Mg, Mn, and Fe. Among these components, Fe is added to prevent seizure between the alloy and the mold, and other Si, Mg, and Mn have a high temperature due to a synergistic effect by simultaneously adding these predetermined amounts. It increases the strength of the alloy in the region, that is, heat resistance and strength. In particular, it is based on the novel findings of the present inventors that the heat resistance and strength can be improved by greatly reducing the amount of Si added from conventional alloys and adding Mg and Mn. And unlike the ADC 12, the aluminum alloy material of the present invention deteriorates the corrosion resistance but ensures high strength without adding Cu that contributes to heat resistance and strength.
[0007]
The amount of Si added in the aluminum alloy material of the present invention is appropriately selected within the range of 0.25 to 3.0 wt%, preferably 0.4 to 2.0 wt%. If the addition amount is less than 0.25 wt%, the strength is not sufficient. On the other hand, addition exceeding 3.0 wt% does not contribute to the improvement of strength.
[0008]
The amount of Mg added is appropriately selected within the range of 0.15 to 1.2 wt%, preferably 0.25 to 1.0 wt%. If the addition amount is less than 0.15 wt%, the strength is not sufficient. On the other hand, when added in excess of 1.2 wt%, it contributes to the improvement of strength, but is liable to cause a detrimental effect that the hot-water flow during die casting is lowered.
[0009]
The amount of Mn added is appropriately selected in the range of 0.3 to 3.0 wt%, preferably 0.5 to 2.0 wt%. If the addition amount is less than 0.3 wt%, the strength is not sufficient. On the other hand, when adding over 3.0 wt%, the toughness of the alloy decreases as is apparent from the comparative examples described later. If the elongation in the tensile test is less than 10%, there is a concern of cracking when deformation stress is applied.
[0010]
Fe is added to prevent seizure of the aluminum alloy and the mold, as is also added to conventional JIS alloys for die casting. If the addition amount is less than 0.2 wt%, the seizure prevention effect is not sufficient, and even if added over 1.0 wt%, the effect remains the same as in the case of 1.0 wt% or less, leading to a decrease in toughness. Only. For this reason, the addition amount of Fe is suitably selected in the range of 0.2 to 1.0 wt%, preferably 0.3 to 0.7 wt%.
[0011]
The aluminum alloy material of the present invention contains unavoidable impurities in addition to the above alloy components. However, as long as the characteristics of the alloy material of the present invention are not impaired, other properties can be improved as necessary, for example, metal structure refinement, etc. Ingredients added for the purpose may be included. Such components include, for example, Zn, Ni, Zr, Cr, Ti, B, Sn, In, Ca, Sr, Na, etc. These components can increase the strength or toughness of the alloy by excessive addition. Since there exists a possibility of reducing, it is necessary to set it as 0.5 wt% or less.
[0012]
The aluminum alloy material of the present invention has higher strength and superior corrosion resistance than conventional JIS alloy ADC12 for die casting in a high temperature region, and is required to have corrosion resistance together with high temperature strength such as heater parts that require high temperature strength. It is an extremely useful alloy material that can be used as a material for water heater parts.
[0013]
【Example】
EXAMPLES The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples unless it exceeds the gist.
[Examples and Comparative Examples]
Alloys having the respective compositions shown in Table 1 below were cast into boat-shaped molds. The obtained ingot was subjected to a high-temperature tensile test at 350 ° C. to evaluate the mechanical properties.
Aluminum having a purity of 99.8 wt% was used as aluminum for alloy preparation, and ADC12 was used as comparative example alloy No. 10.
The tensile test was performed according to JIS Z2201.
As a result of the test measurement, it is clear that the alloys of the examples of the present invention are superior to the ADC 12 in both tensile strength and 0.2% proof stress.
[0014]
[Table 1]
[0015]
Further, a salt water corrosion test was performed using the ingot (Example) and ADC 12 (Comparative Example) obtained above, and the results are shown in Table 2 below.
In the salt water corrosion test, test pieces (20 × 80 mm) of each alloy were immersed in a 1% 5% saline solution at room temperature (20 ° C.) for 30 days, and the weight loss due to corrosion was measured and evaluated. It can be seen that all of the alloys of the examples of the present invention have significantly less corrosion weight loss and excellent corrosion resistance as compared with ADC12.
[0016]
[Table 2]
[0017]
【The invention's effect】
By utilizing the aluminum alloy for die casting of the present invention, it is possible to provide a heater part or the like excellent in high-temperature strength, or a water heater part excellent in high-temperature strength and corrosion resistance.
Claims (1)
Priority Applications (1)
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JP2001150775A JP4703033B2 (en) | 2001-05-21 | 2001-05-21 | Aluminum alloy material for die casting |
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JP2001150775A JP4703033B2 (en) | 2001-05-21 | 2001-05-21 | Aluminum alloy material for die casting |
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JP2002348626A JP2002348626A (en) | 2002-12-04 |
JP4703033B2 true JP4703033B2 (en) | 2011-06-15 |
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JP2001150775A Expired - Lifetime JP4703033B2 (en) | 2001-05-21 | 2001-05-21 | Aluminum alloy material for die casting |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102952974A (en) * | 2011-08-22 | 2013-03-06 | 爱信轻金属株式会社 | Aluminum alloy with excellent abrasion resistance, caulking performance and fatigue strength |
KR101357050B1 (en) | 2011-10-10 | 2014-02-04 | 한국생산기술연구원 | Al-Mg-Fe-Si ALLOY HAVING HIGH THERMAL CONDUCTIVITY FOR DIE CASTING |
KR20150040631A (en) * | 2013-10-07 | 2015-04-15 | 지케이 주식회사 | Die-cast Aluminium Alloy, Metal Case of Portable Electric Apparatus and Manufacturing Method thereof |
EP2924135B1 (en) * | 2014-03-28 | 2017-12-13 | Hydro Aluminium Rolled Products GmbH | Method for producing a sheet made of a high plasticity aluminum alloy having moderate strength for manufacturing semi-finished products or components of motor vehicles |
KR102381270B1 (en) * | 2020-06-09 | 2022-03-30 | 최창민 | Aluminum alloy for casting having excellent thermal conductance |
CN114369746A (en) * | 2021-12-31 | 2022-04-19 | 安徽科蓝特铝业有限公司 | High-temperature aluminum alloy for floor heating pipe and production process thereof |
WO2024058137A1 (en) * | 2022-09-16 | 2024-03-21 | アイシン軽金属株式会社 | Die-casting aluminum alloy excellent in terms of thermal conductivity, etc., and method for producing die-cast material using same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52127418A (en) * | 1976-04-19 | 1977-10-26 | Mitsubishi Chem Ind Ltd | A# alloy with uniform anodic oxidation coating for casting under high pressure |
JPH08127834A (en) * | 1994-10-31 | 1996-05-21 | Ahresty Corp | Aluminum alloy for die casting |
-
2001
- 2001-05-21 JP JP2001150775A patent/JP4703033B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52127418A (en) * | 1976-04-19 | 1977-10-26 | Mitsubishi Chem Ind Ltd | A# alloy with uniform anodic oxidation coating for casting under high pressure |
JPH08127834A (en) * | 1994-10-31 | 1996-05-21 | Ahresty Corp | Aluminum alloy for die casting |
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