Eutectic aluminium silicon alloy for engine pistons etc. - where zirconium is added to obtain pronounced improvement in creep strength

摘要

Eutectic Al-Si alloy, pref. used for components employed in internal combustion engines, esp. pistons, and with compsn. 11-13% Si, 0.8-1.5% Cu, 0.8-1.3% Ni, 0.8-1.3% Mg, rest Al. Specifically the alloy also contains 0.01-0.25% Zr. The alloy pref. also contains is not 0.7% Fe, is not 0.5% 0.5% Cr, is not 0.5% Co, is not 0.3% Ti, is not 0.3% Mn, and/or is not 0.3% Zn. The addn. of Zr improves the high temp. properties of the alloy as indicated by the creep strain limit test over extended periods of time.