Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1602332 | Intermetallics | 2006 | 7 Pages |
Abstract
The microstructures and magnetic properties of as-cast and annealed Fe20Nd80 (hypereutectic) alloys were studied. Depending on the cooling rate the Fe20Nd80 alloys solidify into various metastable eutectic-like structures, which present a wide range of coercivity values varying from 0.2 to 0.48Â T measured at room temperature. The alloys cooled at rates faster than 50Â K/s display fine eutectic-like regions of Nd+A1 and are hard magnetic. The TEM studies clearly show that the hard magnetic A1 regions are microscopically inhomogeneous. The alloys cooled slower than 25Â K/s show a discontinuous rod-type eutectic of Nd+Fe17Nd2 and, consequently, exhibit a soft magnetic behaviour. The correlations between the cooling rate, microstructure, and coercivity of the Fe20Nd80 alloys are discussed.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
G. Kumar, O. Filip, W. Löser, L. Schultz, J. Eckert,