Phase relations in the system Sm-Fe-Ti and the consequences for the production of permanent magnets

Author

Reinsch, B. ; Grieb, B. ; Henig, E. Th ; Petzow, G.

Author_Institution

Pulvermetall. Lab., Max-Planck-Inst. fuer Metallforschung, Stuttgart, Germany

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2832

Lastpage

2834

Abstract

Phase relations in the Fe-rich corner of the Sm-Fe-Ti system were investigated by means of microstructural examinations, EDX, and thermal and thermomagnetic analyses. Between 1000°C and 800°C, equilibria of Sm(Fe, Ti)₁₂ with the phases α-Fe, Fe₂Ti, and Sm(Fe, Ti)₉ were found, which are all ferromagnetic. The nonferromagnetic Sm(Fe, Ti)₁₁ is not in equilibrium with Sm(Fe, Ti)₁₂ because of the equilibrium Fe ₂Ti+Sm(Fe, Ti)₉ (⩾900°C) or Fe₂Ti+Sm₂(Fe, Ti)₁₇ (<900°C). The Sm₅(Fe, Ti)₁₇ compound, having an extremely high anisotropy field, forms part of the stable system. It is in equilibrium with several ferromagnetic phases as well

Keywords

X-ray chemical analysis; ferromagnetic properties of substances; iron alloys; permanent magnets; samarium alloys; thermomagnetic effects; titanium alloys; 800 to 1000 degC; EDX; SmFeTi; anisotropy field; ferromagnetic phases; microstructural examinations; permanent magnets; phase relations; stable system; thermomagnetic analyses; Annealing; Argon; Coercive force; Cooling; Iron; Laboratories; Magnetization; Optical microscopy; Permanent magnets; Production systems;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179642

Filename

179642