Synthesis of magnetic Fe-based bulk metallic glasses starting from the Fe–Cr–Co system

Abstract

Articles you may be interested inFeCoSiBNbCu bulk metallic glass with large compressive deformability studied by time-resolved synchrotron Xray diffraction Amorphous-FeCoCrZrB ferromagnets for use as high-temperature magnetic refrigerants J. Appl. Phys. 99, 08K909 (2006); 10.1063/1.2172234Effects of transition metal substitution on the glass-formation ability and magnetic properties of Fe 62 Co 9.5 Nd 3 Dy 0.5 B 25 glassy alloyThe glass-forming ability of Fe-based bulk metallic glasses is strongly correlated with the amount of metalloids they contain. Starting from a ferromagnetic and ductile Fe-based metallic glass of composition ͑Fe 0.582 Co 0.418 ͒ 80 Cr 10 Zr 10 , we were able to produce several bulk metallic glasses by alloying titanium and boron. The resulting alloys of composition ͓͑Fe 0.582 Co 0.418 ͒ 0.81 Cr 0.10 Zr 0.07 Ti 0.02 ͔ 100−x B x ͑x = 10-20 at. % ͒ exhibit a critical casting thickness of 0.5 mm, a wide undercooled liquid region ⌬T x ͑=T x − T g ͒ of 16-84 K, and ferromagnetic properties. dc magnetization measurements show an inverted hysteresis at room temperature, and small-angle neutron scattering on the ͓͑Fe 0.582 Co 0.418 ͒ 0.81 Cr 0.10 Zr 0.07 Ti 0.02 ͔ 90 B 10 bulk metallic glass reveals a power-law dependence of the differential scattering cross-section. The latter indicates a pronounced short-range order with a surface fractal dimension of 2.5. A splat-cooled sample of the same composition does not reveal this pronounced short-range order, but still an inverted hysteresis. From the scaling behavior of the magnetization curves, measured at different temperatures between 50 and 300 K for the splat-cooled sample, we find that an antagonistic internal magnetic field is present in this material. The resulting inverted hysteresis is presumably caused by interacting superparamagnetic and blocked regions.

Preparation and magnetic properties of FeCoHfMoBY bulk metallic glasses

“…In order to enhance the glass forming ability and improve the magnetic properties of metallic glasses, extensive efforts have been made in recent years by composition and structure design [8][9][10][11][12]. Remarkably, the substitution of a suitable amount of Co is found to be effective to improve the GFA and enhance the magnetic properties of amorphous alloys [13][14][15].…”