Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 16: SYM Phase Transformations in Metallic Melts V
MM 16.4: Vortrag
Dienstag, 26. Februar 2008, 11:00–11:15, H 1058
Microstructure and properties of binary Nd80Fe20 alloys with Ga additions — •Mihai Stoica1, Mahesh Emmi1,2, Shanker Ram2, Albrecht Wiedenmann3, Olivier Perroud3, and Jürgen Eckert1 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270016, D-01171 Dresden, Germany — 2Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India — 3Hahn-Meitner Institute Berlin, Glienickerstr. 100, D-14109 Berlin, Germany
The microstructures upon solidification are diverse and depend primarily on the alloy composition and the applied cooling rate. Fast cooled binary Nd80Fe20 shows hard magnetic properties which can be tuned by properly adjusting the cooling rate. Additions of elements like Ga induce a variation in structure and as a result the magnetic properties change. The investigated alloys contain 4, 8 and 12 at.% Ga. From every composition different samples were produced. Melt spinning was used to produce 4 mm wide and 30 µm thick ribbons and rods with diameters of 3, 5 and 7 mm were cast by copper mould casting. The structure of the samples was investigated by X-ray diffraction and electronic microscopy and the thermal stability was checked by differential scanning calorimetry (DSC). We will discuss the microstructure formation for different samples as a function of two parameters: the composition and the cooling rate. Additionally, the magnetic behaviour of the quenched samples will be presented and discussed in the light of changes in microstructure. The work was supported by the German Science Foundation (DFG) via the DFG priority program Phasenumwandlungen in mehrkomponentigen Schmelzen.