High temperature soft magnetic materials: FeCo alloys and composites

Author

Yu, R.H. ; Basu, S. ; Ren, L. ; Zhang, Y. ; Parvizi-Majidi, Azar ; Unruh, K.M. ; Xiao, John Q.

Author_Institution

Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

3388

Lastpage

3393

Abstract

We have systematically investigated the microstructural effects including grain size, precipitation, and structural order parameter on the high temperature magnetic and mechanical properties of FeCo-based commercial alloys. At high temperatures the equilibrium nonmagnetic precipitates significantly deteriorate the soft magnetic properties. Poor mechanical properties are mainly due to the nature of the ordered structure of FeCo alloys. Based on this understanding we have designed new magnetic composites by reinforcing FeCo alloys with high strength fibers. The magnetic and mechanical properties can thus be improved independently through optimizing the magnetic matrix and fiber network, respectively. These new magnetic composites show excellent soft magnetic and mechanical properties. In particularly, negligible creep has been observed at 600°C

Keywords

Vickers hardness; cobalt alloys; coercive force; creep; ferromagnetic materials; fibre reinforced composites; grain size; iron alloys; magnetic anisotropy; mechanical strength; precipitation; soft magnetic materials; yield stress; FeCo; FeCo alloys; composites; creep; equilibrium nonmagnetic precipitates; grain size; high strength fibers; high temperature magnetic properties; high temperature soft magnetic materials; magnetic composites; magnetocrystalline anisotropy; mechanical properties; microstructural effects; ordered structure; precipitation; structural order parameter; Iron; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnetic separation; Mechanical factors; Perpendicular magnetic anisotropy; Saturation magnetization; Soft magnetic materials; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908809

Filename

908809