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

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2407268· OSTI ID:20884968

Mastrogiacomo, Giovanni; Kradolfer, Juerg; Loeffler, Joerg F ^[1]

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1. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich (Switzerland)

The 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{sub 0.582}Co{sub 0.418}){sub 80}Cr{sub 10}Zr{sub 10}, we were able to produce several bulk metallic glasses by alloying titanium and boron. The resulting alloys of composition [(Fe{sub 0.582}Co{sub 0.418}){sub 0.81}Cr{sub 0.10}Zr{sub 0.07}Ti{sub 0.02}]{sub 100-x}B{sub =} x (x=10-20 at. %) exhibit a critical casting thickness of 0.5 mm, a wide undercooled liquid region {delta}T{sub x}(=T{sub x}-T{sub 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{sub 0.582}Co{sub 0.418}){sub 0.81}Cr{sub 0.10}Zr{sub 0.07}Ti{sub 0.02}]{sub 90}B{sub 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.

• OSTI ID: 20884968
• Journal Information: Journal of Applied Physics, Vol. 101, Issue 1; Other Information: DOI: 10.1063/1.2407268; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
DIFFERENTIAL CROSS SECTIONS
FERROMAGNETIC MATERIALS
HYSTERESIS
IRON ALLOYS
MAGNETIC FIELDS
MAGNETIZATION
METALLIC GLASSES
NEUTRON DIFFRACTION
SMALL ANGLE SCATTERING
SUPERPARAMAGNETISM
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TITANIUM ALLOYS
VITRIFICATION
ZIRCONIUM ALLOYS