Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Liquid and Amorphous Metals I
MM 26.5: Vortrag
Mittwoch, 27. Februar 2008, 15:00–15:15, H 0107
FeNbB bulk metallic glass: the influence of fluxing technique — •Mihai Stoica1, Santosh Kumar1,2, Stefan Roth3, Shanker Ram2, Jürgen Eckert1, and Alain Reza Yavari4 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India — 3IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany — 4LTPCM-CNRS, Institut National Politechnique de Grenoble, 1130 Rue de la Piscine, BP 75, Saint Martin dHères Campus 38402, France
Recently, a new Fe-based BMG containing only 3 elements and a very high boron (Fe66Nb4B30) content was synthesized. The preparation of this BMG was done by employing the copper mould casting method and using the fluxing technique. This new BMG is ferromagnetic, with a Curie temperature around 550 K and a saturation magnetization of 105 emu/g. Differential scanning calorimetry (DSC) investigations revealed a reduced glass transition temperature of 0.58 and an extension of the supercooled liquid region of about 31 K, values which indicate a relatively good thermal stability. Fluxed and not-fluxed master alloys were used to cast samples. The present work aims to discuss, for both kinds of samples, the kinetics of the phase formation using the Kissinger analysis and Johnson-Mehl-Avrami plots, correlated with the results obtained from X-ray diffraction (XRD) of samples with different metastable structures. Additionally, the magnetic behaviour of different phase(s) will be discussed.