Microstructure and its correlation to magnetic properties in 2:17 type (Sm,Gd)-Co-Fe-Cu-Zr alloys |
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Authors: | A. C. Abhyankar R. Gopalan A. K. Singh K. Muraleedharan V. A. Joshi T. S. R. K. Sastry V. Chandrasekaran |
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Affiliation: | (1) Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-, 500 058, India |
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Abstract: | Studies on the evolution of microstructure and phase transformation at various stages of thermal processing have been carried out in 2:17 type (Sm,Gd)-Co-Fe-Cu-Zr alloys. Microstructural studies reveal that during the solution heat treatment stage, a lamellar structure is formed and its volume fraction is found to be more at 1463 K for alloys without Gd, while at 1473 K for alloys with Gd = 25 wt% of Sm. It appears that the formation of the lamellar structure is closely associated with the phase transformation from Th2Ni17 (TbCu7 + Th2Zn17) structure during the solution heat treatment. Magnetic measurements in isothermally aged (1123 K) samples showed that the replacement of 25% of Sm by Gd reduces the energy product from 180 to 136 kJ/m3. The Gd substitution is also found to reduce the temperature coefficient of magnetisation from 350 to 225 ppm/°C in the temperature range of 30–100°C. |
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