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Regensburg 2004 – scientific programme

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M: Metallphysik

M 8: Phasenumwandlungen I

M 8.5: Talk

Monday, March 8, 2004, 15:45–16:00, H4

Characterization of hard magnetic phase in mould-cast and directionally solidified Nd-Fe alloys — •G. Kumar1, R. Sato2, J. Eckert3, W. Löser1, L. Schultz1, and R. Grössinger21IFW Dresden, Institute for Metallic Materials, D-01171 Dresden, Germany — 2Institut für Experimentalphysik, TU Wien, A-1040 Vienna, Austria. — 3TU Darmstadt, FB 11 Materials- und Geowissenschaften, FG Physikalische Metallkunde, D-64287 Darmstadt, Germany.

In this work, Nd80Fe20 alloys were prepared by copper mould casting and directional solidification (DS) to obtain a coarse microstructure. The mould-cast samples exhibit a fine globular eutectic structure and show high room temperature coercivity (  5 kOe). The DS samples exhibit large grains (composition close to NdFe2) in peritectic morphology but show no coercivity. The NdFe2 grains (formed in the DS samples) show clear magnetic domains with uniaxial anisotropy indicating that NdFe2 is not a cubic phase. HRTEM equipped with selected area diffraction (SAD) was used to identify the crystal structure of NdFe2-type phase observed in the DS samples. AC susceptibility and Mössbauer studies were used to identify different magnetic phases. Acknowledgement The work was supported by the German Science Foundation (DFG) via the DFG priority program "Phasenumwandlungen in mehrkomponentigen Schmelzen" under grant Ec 111/11-1,2.

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