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

• Published in: IEEE transactions on magnetics Vol. 28; no. 5; pp. 2832 - 2834
• Main Authors: Reinsch, B., Grieb, B., Henig, E.-T., Petzow, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.09.1992; Institute of Electrical and Electronics Engineers
• Subjects: Annealing; Applied sciences; Argon; Coercive force; Condensed matter: structure, mechanical and thermal properties; Cooling; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Iron; Laboratories; Magnetization; Metals. Metallurgy; Optical microscopy; Permanent magnets; Physics; Production systems; Specific phase transitions; Permanent magnet; Microstructure; Phase diagram; Isothermal section; Phase equilibrium
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.179642

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 degrees C and 800 degrees C, equilibria of Sm(Fe, Ti)/sub 12/ with the phases alpha -Fe, Fe/sub 2/Ti, and Sm(Fe, Ti)/sub 9/ were found, which are all ferromagnetic. The nonferromagnetic Sm(Fe, Ti)/sub 11/ is not in equilibrium with Sm(Fe, Ti)/sub 12/ because of the equilibrium Fe/sub 2/Ti+Sm(Fe, Ti)/sub 9/ (>or=900 degrees C) or Fe/sub 2/Ti+Sm/sub 2/(Fe, Ti)/sub 17/ (<900 degrees C). The Sm/sub 5/(Fe, Ti)/sub 17/ compound, having an extremely high anisotropy field, forms part of the stable system. It is in equilibrium with several ferromagnetic phases as well.< >