Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 47: Topical Session Modern Atom Probe Tomography III - Functional and Nanostructured Materials
MM 47.3: Vortrag
Donnerstag, 29. März 2012, 11:00–11:15, H 0107
On the influence of interfaces, local composition and microstructure on the magnetic properties of Nd2Fe14B — •Catharina Wille1, Torben Boll1, Tala'at Al-Kassab1, Manfred Ruehrig2, and Joachim Wecker2 — 1King Abdullah University of Science and Technology, Division of Physical Sciences, Thuwal, Kingdom of Saudi Arabia — 2Siemens AG, Corporate Research and Technologies, 91058 Erlangen, Germany
In this contribution results on the chemical and microstructural characterisation of a Nd2Fe14B bulk magnet will be reported. As the magnetic coercivity strongly depends on the grain boundary phases, their chemical composition is explored by means of atom probe tomography (APT) in the LAWATAP instrument at King Abdullah University of Science and Technology. Additionally the distribution of Nd in the microstructure and the presence of trace elements like Dy, Ga and Nb has been analysed.
The bulk magnet (MQ2) was prepared by hot pressing from rapidly consolidated powders resulting in an anisotropic microstructure which has been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).
Special emphasis was put on the determination of the spatial gradient of the microstructure both parallel and orthogonal to the deformation direction.