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Method of casting articles of a bulk-solidifying amorphous alloy

United States Patent

5,797,443
August 25, 1998
View the Complete Patent at the US Patent & Trademark Office
A casting charge of a bulk-solidifying amorphous alloy is cast into a mold from a temperature greater than its crystallized melting temperature, and permitted to solidify to form an article. The oxygen content of the casting charge is limited to an operable level, as excessively high oxygen contents produce premature crystallization during the casting operation. During melting, the casting charge is preferably heated to a temperature above a threshold temperature to eliminate heterogeneous crystallization nucleation sites within the casting charge. The casting charge may be cast from above the threshold temperature, or it may be cooled to the casting temperature of more than the crystallized melting point but not more than the threshold temperature, optionally held at this temperature for a period of time, and thereafter cast.
Lin; Xianghong (Laguna Niguel, CA), Johnson; William L. (Pasadena, CA), Peker; Atakan (Aliso Viejo, CA)
Amorphous Technologies International (Laguna Niguel, CA), California Institute of Technology (Pasadena, CA)
08/ 720,483
September 30, 1996
The U.S. Government has certain rights in this invention pursuant to Grant No. FG03-86ER45242 awarded by the department of Energy.