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Title: Development of magnetic Fe-based metallic glasses without metalloids

Abstract

The glass-forming ability of Fe-based metallic glasses has a direct relationship with their metalloid content. A good glass-former usually needs a metalloid content of approximately 20 at. %. However, a high metalloid content causes deterioration not only in magnetic properties but also in elasticity and plasticity. Based on destabilization of the solid state we have developed a series of metalloid-free Fe-based metallic glasses of composition (Fe{sub 0.582}Co{sub 0.418}){sub 100-x-y}Cr{sub x}Zr{sub y} (10{<=}x{<=}28 and 8{<=}y{<=}11). Via this destabilization the liquid state is stabilized, which results in a decreasing liquidus temperature. The mechanical and magnetic properties of the metalloid-free Fe-based metallic glass with the highest Fe and Co fractions were analyzed. The alloy of composition (Fe{sub 0.582}Co{sub 0.418}){sub 80}Cr{sub 10}Zr{sub 10} exhibits bending elasticity and plasticity. Magnetization measurements reveal a saturation magnetization of up to 1.1 T and an inverted hysteresis. The origin of this inverted hysteresis presumably lies in the inclination to decompose in a ferromagnetic iron-rich {alpha}{sub 1} phase and an antiferromagnetic chromium-rich {alpha}{sub 2} phase.

Authors:
; ;  [1]
  1. Laboratory of Metal Physics and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH) Zuerich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
20787799
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 99; Journal Issue: 2; Other Information: DOI: 10.1063/1.2165402; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETIC MATERIALS; ANTIFERROMAGNETISM; CHROMIUM ALLOYS; COBALT ALLOYS; ELASTICITY; FERROMAGNETIC MATERIALS; HYSTERESIS; IRON BASE ALLOYS; MAGNETIC PROPERTIES; MAGNETIZATION; METALLIC GLASSES; PLASTICITY; SATURATION; ZIRCONIUM ALLOYS

Citation Formats

Mastrogiacomo, Giovanni, Kradolfer, Juerg, and Loeffler, Joerg F. Development of magnetic Fe-based metallic glasses without metalloids. United States: N. p., 2006. Web. doi:10.1063/1.2165402.
Mastrogiacomo, Giovanni, Kradolfer, Juerg, & Loeffler, Joerg F. Development of magnetic Fe-based metallic glasses without metalloids. United States. doi:10.1063/1.2165402.
Mastrogiacomo, Giovanni, Kradolfer, Juerg, and Loeffler, Joerg F. Sun . "Development of magnetic Fe-based metallic glasses without metalloids". United States. doi:10.1063/1.2165402.
@article{osti_20787799,
title = {Development of magnetic Fe-based metallic glasses without metalloids},
author = {Mastrogiacomo, Giovanni and Kradolfer, Juerg and Loeffler, Joerg F.},
abstractNote = {The glass-forming ability of Fe-based metallic glasses has a direct relationship with their metalloid content. A good glass-former usually needs a metalloid content of approximately 20 at. %. However, a high metalloid content causes deterioration not only in magnetic properties but also in elasticity and plasticity. Based on destabilization of the solid state we have developed a series of metalloid-free Fe-based metallic glasses of composition (Fe{sub 0.582}Co{sub 0.418}){sub 100-x-y}Cr{sub x}Zr{sub y} (10{<=}x{<=}28 and 8{<=}y{<=}11). Via this destabilization the liquid state is stabilized, which results in a decreasing liquidus temperature. The mechanical and magnetic properties of the metalloid-free Fe-based metallic glass with the highest Fe and Co fractions were analyzed. The alloy of composition (Fe{sub 0.582}Co{sub 0.418}){sub 80}Cr{sub 10}Zr{sub 10} exhibits bending elasticity and plasticity. Magnetization measurements reveal a saturation magnetization of up to 1.1 T and an inverted hysteresis. The origin of this inverted hysteresis presumably lies in the inclination to decompose in a ferromagnetic iron-rich {alpha}{sub 1} phase and an antiferromagnetic chromium-rich {alpha}{sub 2} phase.},
doi = {10.1063/1.2165402},
journal = {Journal of Applied Physics},
number = 2,
volume = 99,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
  • 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,more » 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.« less
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  • A modification of the generalized Slater--Pauling curve so as to consider the concentration dependence of the number of majority-spin {ital sp} electrons per average atom is proposed for amorphous iron-metalloid alloys. In this way an improved matching of the measured magnetic moment dependence on composition is achieved for Fe alloys with B and/or P as metalloids. Comparison of theory with experiment shows that amorphous Fe-P alloys tend to be magnetically rather strong, whereas their Fe-B counterparts are weak itinerant ferromagnets in almost the entire range of compositions.
  • A fundamental study has been conducted on Fe{sub 78}B{sub 13}Si{sub 9} metallic thin ribbon in order to understand the changes in the properties and structures of the glass as a function of Cr and Ni-Mo additions. The separate additions of Cr and Ni-Mo were successful in producing two new metallic thin glasses with the compositions Fe{sub 77}Cr{sub 2}B{sub 16}Si{sub 5} and Fe{sub 74}Ni{sub 4}Mo{sub 3}B{sub 17}Si{sub 2}. The study was focused on evaluating the physical and magnetic properties of these glasses with respect to the Cr and Ni-Mo additions. In addition, characterization of the internal and the surface structures ofmore » the glasses was conducted using transmission electron microscopy and scanning tunneling microscopy, respectively. A comparison between the internal and surface structures of the glasses was carried out on both amorphous and crystalline forms. As a result, a correlation between the properties and the structures of the glasses was established.« less
  • Metallic glasses, a class of amorphous alloys made by rapid solidification, have been studied quite extensively for almost thirty years. It has been recognized for a long time that metallic glasses are usually very strong and ductile, and exhibit high corrosion resistance relative to crystalline alloys with the same compositions. Recently, metallic glasses containing as much as 90 atomic percent aluminum have been discovered independently by two groups. This discovery has both scientific and technological implications. The formability of these new glasses have been found to be unusual. Studies of mechanical properties in these new metallic glasses show that manymore » of them have tensile strengths over 800MPa, greatly exceeding the strongest commercial aluminum alloys. The high strengths of aluminum-rich metallic glasses can be of significant importance in obtaining high strength low density materials. Therefore, from both scientific and technological standpoints, it is important to understand the formation and thermal stability of these metallic glasses. Al-Fe-Gd alloys were chosen for a more detailed study since they exhibit high tensile strengths.« less