Title :
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
fDate :
9/1/1992 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
