Moulded AL-SI-CU aluminium alloy component with high hot-process resistance

Abstract

A cast component with high hot-process mechanical strength and high creep strength in the 230-380° C. temperature range, made of aluminum alloy containing, in wt %: Mg<0.1, and preferably <0.03; Si: 4.5-10; Cu: 2.0-5.0 and preferably 3.0-4.0; Ni<0.4 and preferably <0.1; Ti: 0.05-0.25 and preferably 0.08-0.20; Zr: 0.05-0.25 and preferably 0.12-0.20; Fe: <0.9 and preferably <0.3; Zn<0.3 and preferably <0.1; optionally V: 0.02-0.30 preferably 0.04-0.20; Mn: 0.1-0.5 preferably 0.15-0.40; Hf, Nb, Ta, Cr, Mo and / or W: 0.03-0.30; other elements <0.10 each and <0.30 in total, the rest being aluminum. The alloy is used for the manufacture of internal combustion engine cylinder heads.

Description

TECHNICAL DOMAIN [0001] This invention relates to cast parts made from aluminium alloy subject to high thermal and mechanical stresses, particularly cylinder heads for internal combustion engines, and more particularly turbo-charged engines running on gasoline or diesel fuel. STATE OF THE ART [0002] Two families of aluminium alloys are usually used for the manufacture of engine cylinder heads: [0003] 1) Alloys containing from 5% to 9% of silicon, from 3% to 4% of copper and magnesium. These are usually secondary alloys, with iron contents of between 0.5% and 1%, and fairly high contents of impurities, particularly manganese, zinc, lead, tin or nickel. These alloys are usually used without heat treatment (temper F) or are simply stabilized (temper T5). They are used more particularly for the manufacture of cylinder heads for gasoline engines with fairly low thermal stresses. First melt alloys with an iron content of less than 0.3% are used for parts with greater stresses intended for...

AI Technical Summary

Benefits of technology

[0020] The purpose of this invention is to further improve the mechanical strength and creep resistance within the 230-380°

Problems solved by technology

These two major alloy families lead to different compromises between different usage properties: mechanical strength, ductility, resistance to creep and fatigue.