Effect of Strontium, Magnesium and Iron Content on Mechanical Properties of Rheocast Al-7 mass%Si-Mg Alloys

Abstract

Newly developed Rheocasting process makes semi-liquid slurry in metallic vessel without stirring process. Semi-liquid castings made by this process show good mechanical properties. The effects of strontium, magnesium and iron contents on the mechanical properties of Rheocast and squeeze cast Al-7 mass%Si-Mg alloys were investigated. Elongation of Al-7 mass%Si-Mg alloy Rheocastings was higher than those of squeeze castings when strontium was not added or iron content was up to 0.27 mass%. Both Rheocastings and squeeze castings increased in strength but decreased in elongation with increasing magnesium content in Al-7 mass%Si-xmass%Mg (x=0.23–0.64) alloy.