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M: Metallphysik

M 19: Symposium: Phasenumwandlungen in Schmelzen VIII

M 19.2: Vortrag

Dienstag, 25. März 2003, 16:45–17:00, IFW A

Phase transformations in mold-cast Nd-Fe(Co)-Al alloys — •G. Kumar¹, J. Eckert¹, S. Roth¹, W. Löser¹, S. Fähler¹, H Hermann¹, L. Schultz¹, E. Garcia-Matrès², and A. Wiedenmann² — ¹IFW Dresden, Helmholtz Strasse 20, D-01171 Dresden, Germany — ²Hahn-Meitner Institut Berlin, Glienicker Strasse 100, 14109 Berlin, Germany

Phase transformations in mold-cast Nd_80−xFe_x (x = 15, 20, 25) and Nd₆₀Fe_xCo_30−xAl₁₀ (0 ≤ x ≤ 30) alloys were studied. The magnetic properties of as-cast and annealed samples were investigated with the help of a SQUID magnetometer and a pulse field of 50 T at different temperatures. The hard magnetic properties have been attributed to a metastable structure. Different characterization tools like XRD, SEM, TEM, and neutron scattering were used to study the structure and stoichiometry of the metastable phase. In addition, amorphous Nd_80−xFe_x (x = 15, 20, 25) thin films were prepared by PLD method and the results were compared with the mold-cast bulk samples.

Acknowledgement

The work was supported by the German Science Foundation (DFG) via the DFG priority program No-dqPhasenumwandlungen in mehrkomponentigen SchmelzenNo-dqunder grant Ec 111/11-1.