Dresden 2006 – scientific programme
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MA: Magnetismus
MA 17: Magnetic Materials II
MA 17.8: Talk
Tuesday, March 28, 2006, 12:00–12:15, HSZ 401
Characterization of boron-free Fe-based metallic glasses using small-angle neutron scattering — •Giovanni Mastrogiacomo1, Joachim Kohlbrecher2, and Jörg F. Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH) Zürich, Wolfgang-Pauli-Strasse 10, CH-8093 Zürich, Switzerland — 2Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
According to structural models, the development of Fe-based metallic glasses is strongly correlated to the amount of metalloids. However, a higher amount of metalloids causes deterioration not only in magnetic properties but also in plasticity. Starting from a Fe-Cr-Co system, which exhibits a decomposing tendency in the solid state, several boron-free Fe-based metallic glasses of composition (Fe0.582Co0.418)100-x-yCrxZry (10<x<28 and 8<y<11) were developed. The development of these alloys was based on destabilization of the solid state via the application of the Hume-Rothery rule, where low solubility is achieved for alloying elements with atomic size ratios differing by more than 15%. Alloying of zirconium in the Fe-Cr-Co system, which satisfies the Hume-Rothery rule, causes a decrease in the liquidus temperature. The resulting magnetization measurements of a boron-free Fe-based metallic glass of composition (Fe0.582Co0.418)80Cr10Zr10 reveal a saturation magnetization of up to 1.1 T and an inverted hysteresis. According to small-angle neutron scattering measurements, the inverted hysteresis can be attributed to the presence of two phases, resulting from the decomposing tendency of the Fe-Cr-Co system.