The model permanent magnet based on iron-dysprosium-carbon

Author

Stadelmaier, H.H. ; Jang, T.S.

Author_Institution

Dept. of Mater. Sci. & Eng., North Carolina State Univ., Raleigh, NC, USA

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3423

Lastpage

3425

Abstract

Transformation of Fe₁₇Dy₂C_x to Fe ₁₄Dy₂C produces Fe-Dy-C alloys with intrinsic coercivities exceeding 1200 kA/m (15 kOe). After the material is crushed to produce -325 mesh (<38 μm) particles, typically 2/3 of the coercivity remains. This improved retention of magnetic hardness is attributed to the nature of the grain boundary region, which is less vulnerable to the deformation that accompanies comminution. The phase that impedes the movement of domain walls lies in a thin grain boundary layer, has a composition which is close to that of the principal 14:2:1 phase, and is therefore presumed to be magnetic. Its structure is unknown, but is not that of a recognized binary Fe-Dy or ternary Fe-Dy-C compound. The temperature window for the formation of Fe₁₄Dy ₂C is from 850°C to below 1200°C

Keywords

coercive force; dysprosium alloys; ferromagnetic properties of substances; iron alloys; permanent magnets; 850 to 1200 C; FeDyC alloys; grain boundary region; intrinsic coercivities; magnetic hardness retention; model permanent magnet; Coercive force; Grain boundaries; Iron alloys; Magnetic domain walls; Magnetic domains; Magnetic materials; Magnetic properties; Permanent magnets; Solid state circuits; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42322

Filename

42322