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Metallic glass alloys of Zr, Ti, Cu and Ni

United States Patent

*** EXPIRED ***
April 8, 1997
View the Complete Patent at the US Patent & Trademark Office
At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula wherein x is from 0.1 to 0.3, y.cndot.c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b.
Lin; Xianghong (Pasadena, CA), Peker; Atakan (Pasadena, CA), Johnson; William L. (Pasadena, CA)
California Institute of Technology (Pasadena, CA)
08/ 569,276
December 8, 1995
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.