Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 58: Topical Session Modern Atom Probe Tomography VI - Ordering, Clustering and Segregation
MM 58.3: Vortrag
Donnerstag, 29. März 2012, 17:30–17:45, H 0107
Atom probe tomography study of the clustering and crystallization kinetics in FeSiNbBCu alloys — •Pradeep Konda Gokuldoss1, Pyuck Pa Choi1, Aleksander Kostka1, Stefanie Sandloebes1, Dierk Raabe1, and Giselher Herzer2 — 1Max planck Institut fuer Eisenforschung GmbH, Duesseldorf, Germany — 2Vacuumschmelze GmbH & Co. KG, Hanau, Germany
Partially nanocrystalline FeSiNbBCu alloys with about 25 vol. % retained amorphous matrix are used for their excellent soft magnetic properties. Rapidly solidified Fe-Si-Nb-B-Cu amorphous ribbons upon annealing undergo nanocrystallization, where soft magnetic Fe-Si nanocrystals are formed. Nanocrystallization of Fe-Si grains in these compounds is kinetically governed by the size and density of Cu clusters that precede Fe-Si crystallization. In this work we study the kinetics of Cu clustering and subsequent Fe-Si nano-crystallization in an amorphous Fe73.5Si15.5Cu1Nb3B7 alloy, by atom probe tomography. The microstructural changes in terms of the number density of Cu clusters and the resulting size difference of Fe-Si nano crystals during isothermal and isochronal kinetic studies will be presented. Also, the direct implications of these microstructural changes on the soft magnetic properties will be discussed.