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

Abstract

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 presumablymore » caused by interacting superparamagnetic and blocked regions.« less

Authors:
; ;  [1]
  1. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
20884968
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 1; Other Information: DOI: 10.1063/1.2407268; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Mastrogiacomo, Giovanni, Kradolfer, Juerg, and Loeffler, Joerg F. Synthesis of magnetic Fe-based bulk metallic glasses starting from the Fe-Cr-Co system. United States: N. p., 2007. Web. doi:10.1063/1.2407268.
Mastrogiacomo, Giovanni, Kradolfer, Juerg, & Loeffler, Joerg F. Synthesis of magnetic Fe-based bulk metallic glasses starting from the Fe-Cr-Co system. United States. doi:10.1063/1.2407268.
Mastrogiacomo, Giovanni, Kradolfer, Juerg, and Loeffler, Joerg F. Mon . "Synthesis of magnetic Fe-based bulk metallic glasses starting from the Fe-Cr-Co system". United States. doi:10.1063/1.2407268.
@article{osti_20884968,
title = {Synthesis of magnetic Fe-based bulk metallic glasses starting from the Fe-Cr-Co system},
author = {Mastrogiacomo, Giovanni and Kradolfer, Juerg and Loeffler, Joerg F.},
abstractNote = {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.},
doi = {10.1063/1.2407268},
journal = {Journal of Applied Physics},
number = 1,
volume = 101,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}