Heat resistant aluminium alloy

An aluminum alloy, heat resistance technology, applied in the field of AlMgSi type aluminum alloy, can solve the problems of increasing heat cracking tendency, castability, etc.

Active Publication Date: 2007-07-18
АЛЮМИНИУМ РАЙНФЕЛЬДЕН ГМБХ
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  • Application Information

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Problems solved by technology

But copper also increases the tendency to heat cracking and has a negative effect on castability

Method used

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  • Heat resistant aluminium alloy

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Embodiment Construction

[0051] Polygon A shown in FIG. 1 defines the content ranges of alloying elements Mg and Si, and polygons B and C refer to preferred ranges. Line E corresponds to the quasi-binary eutectic Al-Mg 2 The composition of Si. Therefore, the alloy composition of the present invention is on the magnesium excess side.

[0052] The alloys of the invention were cast into die-cast sheets with different wall thicknesses. Tensile samples were made from these die-cast sheets. The mechanical properties, i.e. limit of elongation (Rp0.2), tensile strength (Rm) and elongation at break (A), were determined on tensile samples in the following states:

[0053] F casting state

[0054] Water / F cast state, quenched in water after demoulding

[0055] F>24h cast state, storage at room temperature>24h

[0056]Water / F > 24h As cast, quenched in water after demoulding, and stored at room temperature > 24h and after different one-step heat treatments in the temperature range 250°C to 380°C and in the ...

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Abstract

In an aluminium alloy of type AlMgSi with good creep strength at elevated temperatures for the production of castings subject to high thermal and mechanical stresses the contents of the alloying elements magnesium and silicon in % w / w in a Cartesian coordinate system are limited by a polygon A with the coordinates [Mg; Si] [8.5; 2,7] [8.5; 4,7] [6.3; 2,7] [6.3; 3.4] and that the alloy also contains 0.1 to 1% w / w manganese max. 1% w / w iron max. 3% w / w copper max. 2% w / w nickel max. 0.5% w / w chromium max. 0.6% w / w cobalt max. 0.2% w / w zinc max. 0.2% w / w titanium max. 0.5% w / w zirconium max. 0.008% w / w beryllium max. 0.5% w / w vanadium as well as aluminium remainder rest with further elements and manufacturing -related impurities of individually max. 0.05% w / w and max. 0.2% w / w in total. The alloy is suitable in particular for the production of cylinder crankcases by the pressure die casting method.

Description

technical field [0001] The invention relates to an aluminum alloy of the AlMgSi type which has good permanent heat resistance and is used for the production of cast parts subject to high thermal and mechanical loads. Background technique [0002] Further refinement work on diesel engines aimed at better combustion of diesel fuel and higher power coefficients leads in particular to additionally higher explosion pressures and as a result a pulsatingly acting mechanical load on the cylinder crankcase, This places the most stringent demands on the material. In addition to high fatigue strength, high-temperature fatigue strength of the material is another prerequisite for use in the production of cylinder crankcases. [0003] At present, AlSi alloys are usually used for parts with heat requirements, wherein heat resistance is achieved by incorporating Cu. But copper also increases the tendency to heat cracking and has a negative effect on castability. Applications in which hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08B22D21/04F02F7/00
CPCC22C21/08C22F1/05C22C21/06
Inventor R·弗兰克
Owner АЛЮМИНИУМ РАЙНФЕЛЬДЕН ГМБХ
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