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Title: Metallic glass alloys of Zr, Ti, Cu and Ni

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 (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c 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.more » This definition of the alloys has additional constraints on the range of copper content, b.« less
Inventors:
 [1];  [1];  [1]
  1. (Pasadena, CA)
Issue Date:
OSTI Identifier:
870893
Assignee:
California Institute of Technology (Pasadena, CA) OAK
Patent Number(s):
US 5618359
Contract Number:
FG03-86ER45242
Research Org:
California Institute of Technology (Pasadena, CA)
Country of Publication:
United States
Language:
English
Subject:
metallic; glass; alloys; zr; cu; quaternary; form; cooling; below; transition; temperature; rate; 10; comprise; titanium; 19; 41; atomic; percent; metal; etm; 21; copper; plus; ltm; 49; 64; comprises; zirconium; hafnium; cobalt; nickel; composition; constrained; product; times; proportion; relative; 14; percentage; 24; furthermore; total; amount; limited; forming; formula; 1-x; 1-y; cndot; 18; 47; 67; 42; 37; definition; additional; constraints; range; content; ternary alloy; metallic glass; glass forming; atomic percent; transition metal; transition temperature; form metal; glass transition; alloys comprise; atomic percentage; comprises cobalt; alloys form; quaternary alloys; form metallic; cooling below; glass alloys; ternary alloys; quaternary alloy; /148/420/