Grain refiner for aluminum containing silicon

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

1990-08-24

1993-01-19

Wyszomierski, George

Metal treatment

Stock

Aluminum base

420552, C22C 2100

Patent

active

051804476

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 commerical master alloys contain a ratio of Ti to B exceeding 2.2 to promote a mixture of TiB.sub.2 and TiAl.sub.3 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.

REFERENCES:
patent: 3857705 (1974-12-01), Miyasaka et al.
Klang, "Grain Refinement of Aluminum by addition of Al-Ti-B . . . " Chem. Commun., Univ. Stockholm, vol. 4, pp. 82, 1981.
Chem Ab. #96:203761d.
Abdel-Homid et al. "Nature and Morphology of Crystals Rich in Titanium . . . " J. Crystal Growth, vol. 66, No. 1, Jan.-Feb. 1984, pp. 195-204.

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