Hypoeutectic aluminum-silicon alloy having reduced...

Details Hypoeutectic aluminum-silicon alloy having reduced... Hypoeutectic aluminum-silicon alloy having reduced...

2005-08-02

2005-08-02

Wyszomierski, George (Department: 1742)

Alloys or metallic compositions

Aluminum base

Magnesium containing

C420S547000, C420S549000, C148S415000

Reexamination Certificate

active

06923935

ABSTRACT:
A hypoeutectic aluminum silicon casting alloy having a refined primary silicon particle size and a modified iron morphology. The alloy includes 10 to 11.5% by weight silicon, 0.10 to 0.70% by weight magnesium and also contains 0.05 to 0.07% by weight strontium. On cooling from the solution temperature, the strontium serves to modify the silicon eutectic structure as well as create an iron phase morphology change. Such changes facilitate feeding through the aluminum interdendritic matrix. This, in turn, creates a finished die cast product with extremely low levels of microporosity defects. The alloy may be used to cast engine blocks for marine outboard and stern drive motors. Furthermore, when the magnesium levels are adjusted to approximately 0.10 to 0.20% by weight magnesium, propellers having a highly advantageous ductility may be obtained.

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“ASM Handbook: vol. 18 Friction, Lubrication, and Wear Technology”, ASM International, pp 785-790 (1993).

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