Product Overview
10% Strontium Aluminum is an aluminum-strontium master alloy with a nominal composition of 90% Al and 10% Sr. It is the standard modifier for aluminum-silicon casting alloys. Without modification, the eutectic silicon in alloys such as A356, 356, and 413 forms coarse, plate-like crystals that reduce ductility. A small strontium addition changes the silicon to a fine, fibrous form.
Modification significantly improves elongation, impact strength, and fatigue resistance, and can improve machinability and pressure tightness. Unlike sodium, strontium is not quickly lost from the melt, so the modifying effect lasts through long holding times and remelting. It is widely used for automotive wheels, structural castings, and other aluminum-silicon castings where toughness is important.
Supplied as 6 oz and 1.5 oz pieces for easy additions to crucibles and ladles.
