FE-BASED BULK AMORPHOUS ALLOY COMPOSITIONS CONTAINING MORE THAN 5 ELEMENTS AND COMPOSITES CONTAINING THE AMORPHOUS PHASE

摘要

Disclosed is a Fe-based bulk amorphous alloy composition which forms a bulk amorphous substance due to its excellent amorphous formability when it is cooled to a temperature lower than its glass transition temperature from the liquid state at a relatively low cooling rate of 1000 K/s or less, has high warm processability in a low temperature range owing to its supercooled liquid region of 20K or higher and has excellent fluidity in the liquid state and thereby good castability. The Fe-based multi-element bulk amorphous alloy composition is represented by a formula of FeαC&bgr;SiγBxPyMa, in which M is at least one element selected from Ti(titanium), Cr(chromium), Mo(molybdenum), Nb(niobium), Zr(Zirconium), Ta(tantalum), W(tungsten) and V(vanadium), α, &bgr;, γ, x, y, and a each represent atomic % of iron(Fe), Carbon(C), silicon(Si), boron(B), phosphorus(P) and the selected metal element, in which α is 100-(&bgr;+γ+x+y+a) atomic %, &bgr; is 6 atomic % or more and 13 atomic % or less, γ is 1 atomic % or more and 5 atomic % or less, x is 4.5 atomic % or more and 9.5 atomic % or less, y is 3 atomic % or more and 10 atomic % or less and a is 0.1 atomic % or more and 6 atomic % or less.