Grain refiner for aluminum containing silicon

Details Grain refiner for aluminum containing silicon Grain refiner for aluminum containing silicon

C - Chemistry, Metallurgy

22

C

53/247, 75/87

C22C 1/03 (2006.01) C22C 21/00 (2006.01) C22C 32/00 (2006.01)

Patent

CA 1277855

ABSTRACT Disclosed is an Al-Ti-B master alloy especially designed to grain refine cast aluminum alloys containing silicon. The alloy composition goes contrary to present known art. Present commercial master alloys contain a ratio of Ti to B exceeding 2.2 to promote a mixture of TiB2 and TiAl3 crystals. This invention provides an Al-Ti-B alloy wherein the Ti to B ratio is 1. It contains a preponderance of mixed boride crystals. The optimum composition of the alloy of this invention is Al-3Ti-3B.

504223

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