Effect of the composition and microalloying with strontium on the structure and properties of Al-Si-Mg alloys

Fatigue life evaluation of A356 aluminum alloy used for engine's cylinder head

“…Another negative aspect of Na is the damage it causes to melting crucibles. Ganiev and Vakhobov (1983) and Beumler and colleagues (1988) indicate that small additions of these elements change the morphology of the eutectic silicon phase from a coarse plate-shaped phase to a refined fibrous eutectic. The result is that fragile silicon particles become small finely-divided fibers, rather than broad and coarse plates that act as stress concentrators and weakness planes that promote crack propagation, according to Wang and Cáceres (1998) and Digho and Gokhale (1997).…”

Comportamento da liga de alumínio A356-T6 fundida e tixoextrudada sob fadiga isotérmica e termomecânica

“…A modificação da fase eutética de silício é normalmente realizada através de pequenas adições de sódio (Na) ou estrôncio (Sr) à liga de alumínio fundido antes do vazamento, segundo GANIEV & VAKHOBOV (1983);.…”