Dresden 2003 – wissenschaftliches Programm

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M: Metallphysik

M 16: Symposium: Phasenumwandlungen in Schmelzen VI

M 16.1: Vortrag

Dienstag, 25. März 2003, 11:45–12:00, IFW A

Dense-random packing approach to the structure of multicomponent amorphous and liquid Nd-based alloys — •Helmut Hermann¹, Sergei Korotkov¹, Jürgen Eckert¹, Golden Kumar¹, Albrecht Wiedenmann², Elvira Garcia-Matrès², Dietrich Stoyan³, and Alexander Bezrukov³ — ¹IFW Dresden, PFf 270116, 01171 Dresden — ²HMI Berlin, Glienicker Str. 100, 14109 Berlin — ³Universität BA Freiberg, Institut für Stochastik, B.-von-Cotta-Str.2, 09596 Freiberg

Bulk amorphous NdFeCoAl alloys show interesting magnetic properties which depend strongly on the cooling conditions chosen for the preparation process. It is assumed that the magnetic properties are correlated to structural fluctuations on a nanometre scale. We use the model of dense-randomly packed spheres to simulate amorphous and liquid multicomponent alloys. The radii distribution of the spheres corresponds to the atomic radii and the chemical composition of the alloys. In a first step, homogeneous randomly packed models are generated. Then, suitable nanocrystalline precipitations are induced. The scattering intensities of the models are calculated and compared to experimental data. Finally, hypotheses for the structure of the alloys considered are derived.

Acknowledgement: The work has been supported by the German Science Foundation (DFG) via the DFG priority program No-dqPhasenumwandlungen in mehrkomponentigen SchmelzenNo-dq under grant HE 2077/13-1.