Hyper-eutectic aluminum-silicon based alloys for castings

Details Hyper-eutectic aluminum-silicon based alloys for castings Hyper-eutectic aluminum-silicon based alloys for castings

1976-05-27

1977-10-25

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75143, C22C 2104

Patent

active

040554171

ABSTRACT:
A hyper-eutectic aluminum-silicon based alloy for castings has an essential disadvantage in its poor strength. The present invention provides an alloy comprised of 16-25% Si, 3.0-5.5% Cu, 0.2-0.8% Mg, 0.3-0.8 Mn, not more than 0.25% Ti and not more than 0.3% Fe to remove the above mentioned disadvantage. Another provided alloy containing 0.5-1.5% Zn in addition to the above mentioned ingredients not only removes the above mentioned disadvantage but also improves machinability. A still further provided alloy containing 0.3-2.0% Pb in addition to the first mentioned ingredients not only removes the above essential disadvantage but also improves machinability as well as additionally enhancing the wear resistance. In the disclosed alloys the content of iron as one of the impurities is restricted to a low level, because iron destroys the effect of the invention to remove said disadvantage.

REFERENCES:
patent: 2076578 (1937-04-01), Kempf et al.
patent: 2357450 (1944-09-01), Bonsack
patent: 2357451 (1944-09-01), Bonsack
patent: 3716355 (1973-02-01), Wikle et al.
patent: 3765877 (1973-10-01), Sperry et al.

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