Abstract: The present invention relates to a castable heat resistant aluminum alloy for high temperature applications such as components in combustion engines, in particular for the manufacturing of highly loaded cylinder heads, the alloy comprises the following composition: .Si: 6.5-10 wt %.Mg: 0.25-0.35 wt %.Cu: 0.3-0.7 wt %.Hf: 0.025-0.55 wt % Optionally with the addition of: .Ti: 0-0.2 wt %.Zr: 0-0.3 wt %, the balance being made of Al and unavoidable impurities including Fe.

Abstract: The present invention relates to a castable heat resistant aluminium alloy for high temperature applications such as components in combustion engines, in particular for the manufacturing of highly loaded cylinder heads, he alloy comprises the following composition: .Si: 6.5-10 wt %.Mg: 0.25-0.35 wt %.Cu: 0.3-0.7 wt %.Hf: 0.025-0.55 wt % Optionally with the addition of: .Ti: 0-0.2 wt %.Zr: 0-0.3 wt %, the balance being made of Al and unavoidable impurities including Fe.

Abstract: A component, in particular a safety, structural or ground connection component for a motor vehicle, cast under pressure, and made of an aluminum alloy with the following composition (in wt. %): Mg: 1.0-4.5; Si: 0.2-1.3; Cu<0.3; Zn<0.1; Fe<0.3, Ti<0.3 and at least one element for reducing adherence to the mold which is Mn (0.3-1), Cr (0.1-0.4), Co (0.1-0.4), V (0.1-0.4) and Mo (0.1-0.4), other elements<0.05 each and 0.15 in total, the remainder being aluminum.

Abstract: A safety or structural part cast under pressure made of high-ductility aluminum alloy containing, by weight: Si 2-6%; Mg<0.40%; Cu<0.30%; Zn<0.30%; Fe<0.50%; Ti<0.30%, at least one element for reducing adherence to the mold such as Mn (0.3-2%), Cr (0.1-0.3%), Co (0.1-0.3%), V (0.1-0.3%) or Mo (0.1-0.4%), and at least one element for modifying eutectics, such as Sr (50-500 ppm), Na (20-100 ppm) or Ca (30-120 ppm). Other elements may be present in an amount <0.05 each and <0.10 in total, the balance being aluminum. The part exhibits, after T5 tempering at a temperature less than 220° C., a yield strength Rp0.2>110 MPa and an elongation A>10%.