Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 17: Mechanical Properties III
MM 17.4: Vortrag
Dienstag, 24. März 2009, 11:00–11:15, IFW D
Multi-scale phase composites in high strength hypoeutectic FeCo-based alloys with large plasticity — •Ran Li1, Gang Liu1, Mihai Stoica1, and Jürgen Eckert1,2 — 1IFW Dresden, Institut für Komplexe Materialien, P.O. Box 27 01 16, D-01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
Near-equiatomic FeCo alloy is a famous conventional magnetic material ideally suitable for the applications of high magnetic flux density such as electromagnetic system in aircraft industry. However, notorious brittleness of this alloy obstructs its industrial application. By controlling rapid-solidification condition and designing multicomponent alloying, we produced a family of FeCo-based multi-scale phase composites with good mechanical properties. Comparing with equiatomic FeCo alloy, the designed alloys exhibit 3-7 times improvement of yield stress and plastic deformation of 3-18 % during compressive test. The structural analysis indicated that fined grains induced by the control of liquid solidification and morphologic construction of multi-scale phase composite endow these alloys with good mechanical properties. Although the alloying slightly decreased the saturation magnetization of resulting alloys, it still remains around 2 T as high as the result of pure iron. Furthermore, the strength and deformation behavior are quantitatively related to the volume fraction and size of the multi-scale phases via modeling, which can give a useful guideline to design this kind of composite alloys.