Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 19: Mikro- und nanostrukturierte magn. Materialien I
MA 19.9: Vortrag
Montag, 7. März 2005, 12:30–12:45, TU EMH225
SOFT MAGNETIC PROPERTIES OF Fe-Cr-Mo-Ga-P-C-B BMG — •Stoica Mihai1, Roth Stefan1, Rellinghaus Bernd1, Schultz Ludwig1, and Eckert Jürgen2 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany — 2Physical Metallurgy Division, TU Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany
The Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk metallic glass (BMG) exhibits good soft magnetic properties. However, the maximum achievable diameter of this Fe-based BMG is limited to only a few millimeters. Amorphous rods with diameters of 1.5-3 mm and discs with diameters and thicknesses of 10 mm and 1 mm, respectively, were prepared by copper mold casting. The coercivity of the as-cast rods and disc is around 5 A/m and it decreases to less than 1 A/m upon annealing. The saturation polarization is around 0.8 T at room temperature, increasing to up to 1 T at 77 K.
On the other hand, powder metallurgical methods (i.e. ball milling combined with subsequent consolidation of the resulting powders) provide the advantages to prepare bulk amorphous samples with larger sizes and a large variety of shapes. The present contribution aims at comparing the magnetic properties of the as-prepared and annealed bulk metallic glasses obtained by copper mold casting and powder metallurgy, respectively.