Aluminum strontium alloy
Modification of the morphology of the silicon phase in aluminum silicon alloy castings from coarse platelets to fine fibrous eutectic structure results in improved soundness and mechanical properties, particularly ductulity. He use of strontium to "modify" the structure of aluminum silicon casting alloys is a very effective and widely accepted practice.
Strontium differs from other modifiers in that it retains its modification effectiveness for extended periods of melt holding time. The modification provided by strontium tends to survive repeated remelting so that strontium is commoly referred to a "permanent" modifier. In master alloy form, strontium is the preferred choice in foundries for recovery, safety, storage and handling.
Chemical composition of aluminum titanium alloy
Type Composition(%)
Sr Fe Ca Si Ba Other impurities Balance
AlSr5 AA-H2018 4.5-5.5 0.30 0.05 0.20 0.05 0.10 Al
AlSr10 AA-H2007 9-11 0.30 0.03 0.20 0.10 0.10 Al
AlSr15 AA-H2019 14-16 0.30 0.05 0.20 0.10 0.10 Al
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