| 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 Fe<SUB>alpha</SUB>, C<SUB>beta</SUB>Si<SUB>gamma</SUB>B<SUB>x</SUB>P<SUB>y</SUB>M<SUB>a</SUB>, 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), alpha, beta, gamma, 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 alpha is 100-(beta+gamma+x+y+a) atomic %, beta is 6 atomic % or more and 13 atomic % or less, gamma 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.
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