Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 43: Liquid and Amorphous Metals II - Mechanical properties
MM 43.5: Vortrag
Mittwoch, 2. April 2014, 12:45–13:00, IFW A
atomic structures and magnetic properties of FeB-based amorphous alloys — •Guangcun Shan1,2, Jiliang Zhang1, and Chan-Hung Shek1 — 1Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR — 2Max-Planck-Institut für Chemische Physik fester Stoffe
Several FeB-based amorphous alloys (Fe80B8Si12, Fe71B17Si12 and Fe71B17(Nb4Y4Zr4)) with good mechanical properties and soft magnetic properties have recently been well developed by addition of solute atoms to tune the magnetic properties and glass forming ability (GFA). The atomic structures were revealed by state-of-the-art extended X-ray absorption fine structure spectroscopy (EXAFS) combining with ab initio molecular-dynamics (AIMD) computational techniques. Both AIMD computational results and the EXAFS spectra present clear evidence of a very different chemical and topological short-range order (SRO) around the Fe atom in all the studied samples. The experimental results of nanoindentation, XPS and thermal stability were in good agreement with the EXAFS results. Besides, the magnetic behaviors were discussed in view of the EXAFS results and atomic clusters of the glassy alloys.