Hypereutectic aluminum-silicon alloy having refined primary...

Details Hypereutectic aluminum-silicon alloy having refined primary... Hypereutectic aluminum-silicon alloy having refined primary...

C - Chemistry, Metallurgy

22

C

C22C 21/04 (2006.01) C22C 21/02 (2006.01)

Patent

CA 2068759

-13- HYPEREUTECTIC ALUMINUM-SILICON ALLOY HAVING REFINED PRIMARY SILICON AND A MODIFIED EUTECTIC Abstract of the Disclosure A hypereutectic aluminum silicon casting alloy having a refined primary silicon particle size and a modified silicon phase in the eutectic. The aluminum base alloy includes from 19% to 30% by weight of silicon and also contains 0.005% to 0.05% by weight of phosphorus, and 0.15% to 1.15% by weight of titanium. On cooling from solution temperature, the phosphorus serves as an active nucleant for the primary silicon phase, while at a lower temperature, a titanium-aluminum intermetallic compound is formed that is sheathed by the pseudoprimary .alpha.-aluminum and the sheathed particles act as a nucleant to modify the acicular silicon phase in the eutectic. The resulting alloy has primary silicon refinement coupled with eutectic silicon modification.

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