Abstract
Strontium is well known for its ability to modify the eutectic silicon phase in aluminum-silicon foundry alloys. More recently, however, it has been established that strontium also stabilizes the more desirable α iron-bearing intermetallic phase in 6XXX series wrought aluminum alloys. As a result, lengthy billet homogenization times that are normally required to transform the acicular β iron-bearing intermetallic phase to the α phase can be shortened significantly. In the case of the foundry alloys, strontium additions to a 380 alloy were found to increase the pressure tightness of high-pressure die castings by as much as 60%. This improvement is believed to occur as a result of improved metal flow with the strontium addition causing a reduction in the size of the entrapped air pores and the refinement of sludge particles.
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