Heat resistant aluminium alloy

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...

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Problems solved by technology

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

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