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Quinary metallic glass alloys

United States Patent

*** EXPIRED ***
April 7, 1998
View the Complete Patent at the US Patent & Trademark Office
At least quinary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise zirconium and/or hafnium in the range of 45 to 65 atomic percent, titanium and/or niobium in the range of 4 to 7.5 atomic percent, and aluminum and/or zinc in the range of 5 to 15 atomic percent. The balance of the alloy compositions comprise copper, iron, and cobalt and/or nickel. The composition is constrained such that the atomic percentage of iron is less than 10 percent. Further, the ratio of copper to nickel and/or cobalt is in the range of from 1:2 to 2:1. The alloy composition formula is: wherein the constraints upon the formula are: a ranges from 45 to 65 atomic percent, b ranges from 5 to 15 atomic percent, c ranges from 4 to 7.5 atomic percent, d comprises the balance, d.multidot.y is less than 10 atomic percent, and x/z ranges from 0.5 to 2.
Lin; Xianghong (Pasadena, CA), Johnson; William L. (Pasadena, CA)
California Institute of Technology (Pasadena, CA)
08/ 604,452
February 21, 1996
This invention was made with Government support under DE-FG03-86ER45242 awarded by the Department of Energy. The Government has certain rights in the invention.