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MA: Fachverband Magnetismus
MA 24: Magnetic Materials I
MA 24.6: Talk
Wednesday, March 18, 2015, 11:00–11:15, H 0112
Enhancement of soft magnetic properties of FeCoBSiNb bulk glassy alloys — •Parthiban Ramasamy1, Mihai ' Stoica2, and Jürgen Eckert3 — 1IFW Dresden, Institute for Complex Materials,Dresden, Germany — 2IFW Dresden, Institute for Complex Materials,Dresden, Germany — 3IFW Dresden, Institute for Complex Materials,Dresden, Germany
Fe based bulk metallic glasses are gaining more importance in recent decades due to their high strength and excellent soft magnetic properties, combined with low materials cost. The effect of Zr addition on the glass forming ability (GFA) of FeCoBSiNb glassy alloys in [(Fe0.5Co0.5)B0.2Si0.05]96-xNb4Zrx and [(Fe0.5Co0.5)B0.2Si0.05]100-xZrx system is investigated. In this study effect of Zr addition is studied because of its mixing enthalpies between Zr and Fe, Co, B, or Si atomic pairs are-26, -41, -49, -56, and -67 kJ/mol, respectively, and they are larger than those between Nb and Fe, Co, B, or Si atomic pairs, which are -16, -25, -30, -39, and-39 kJ/mol, respectively. The addition of Zr instead of Nb decreases the liquidus temperature of the system around 100K (i.e. from 1475K to 1370K). Thought the formation of the ZrB2 slightly affects the glass forming ability of the alloy, the Zr helps in the precipitation of (Fe, Co) phase, which is magnetically softer than the Fe23B6 phase and also mechanical properties of the alloy is improved.