Fe-based bulk amorphous alloy compositions containing more than 5 elements and composites containing the amorphous phase

Abstract

Disclosed is a Fe-based bulk amorphous alloy composition which forms a bulk amourphose 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 2OK 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 a C ss Si B x Py M a , in which M is an element selected from Ti(titanium), Cr(chromium), Mo(molybdenum), Nb(niobium), Zr (Zirconium), Ta( tantalum), W(tungsten) and V(vanadium), a, ss, , 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 a is 100-(ss++x+y+a) atomic %, ss is 6 atomic % or more and 13 atomic % or less, 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.

Description

technical field [0001] The invention relates to a ferrous bulk amorphous alloy composition. More specifically, the present invention relates to ferrous bulk amorphous alloy compositions when cooled from a liquid state to a temperature below its glass transition temperature at a relatively low cooling rate of less than 1000 K / s , due to its excellent amorphous formability to form bulk amorphous substances, the composition has high thermal processability in the low temperature range due to its supercooled liquid region above 20K, and has excellent Fluidity, so it has good castability. Background technique [0002] Most metal alloys form crystals with a regular arrangement of atoms when solidified from a liquid phase. However, the irregular atomic structure in the liquid phase can be maintained if the cooling temperature is fast enough to exceed a critical value, thereby inhibiting the nucleation of the crystalline phase. Alloys with such a structure are called amorphous all...

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Problems solved by technology

[0012] Second, since most alloys contain rare metals such as Er (erbium), Y (yttrium), etc. or a large amount of expensive atoms such as Mo (molybdenum) and Cr (chromium), there are problems related to increased production costs, including the unit of raw materials costs and additional costs for dissolution and use of special furnaces

[0013] Third, the conventional bulk amorphous alloys have a much higher viscosity in the liquid phase compared to common metals and thus are less castable, which presents limitations in casting and product design

Therefore, although conventional bulk amorphous alloys have very unique and favorable properties, they have only been prepared experimentally and have problems related to production costs and difficulties in adopting methods for mass production using existing equipment, etc.

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