Abstract
The formation of tetragonal R 2(FeCo) 14C phase has been examined in as-cast and melt-spun R 14Fe 78− x Co x C 8 alloys with cobalt substitutions (R = Y, Dy, Nd). The magnetic properties over a temperature range and the microstructure have been studied as a function of cobalt content. The Curie temperature is increased with Co content but the anisotropy K is decreased. High cobalt content leads to the formation of 1:5 phase. High corecivities have been developed in as-cast and melt-spun Dy 14Fe 78− x Co x C 8 alloys with Co content at zero and 32 at %, respectively. As-cast Nd 16Fe 78− x Co x C 8 alloys did not show any permanent magnetic properties although they had the 2:14:1 phase. However, melt-spun and powdered NdFeCoC samples showed a coercivity with the highest value corresponding to a melt-spun Nd 14Fe 78C 8 sample. Microstructure studies showed that the high H C in ribbons is due to the fine grain size which is in the range of 500–1000 Å.
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