Abstract
We have investigated the microstructure of Nd 6Pr 1Fe 80− x Ti x B 13− y C y ( x = 0, 4; y = 0, 1) melt-spun ribbons using transmission electron microscopy (TEM) and three dimensional atom probe (3DAP) analysis to correlate their hard magnetic properties with the microstructure. Optimally quenched and annealed Nd 6Pr 1Fe 76B 12Ti 4C 1 ribbon, which was composed of Nd 2Fe 14B grains of about 16 nm mean diameter separated by Fe 3B grain boundary phase, showed a maximum energy product of 112 kJ/m 3 with coercivity of 510 kA/m. The addition of 4 at.% Ti significantly modified the solidification path by suppressing the formation of Nd 2Fe 23B 3 phase and promoting the formation of Nd 2Fe 14B phase. TEM observations showed that the additions of Ti and C refined the microstructure, and 3DAP analysis indicated that the formation of TiC at the Nd 2Fe 14B grain boundary is the reason for the refined grain size and enhanced remanence.
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