Metallurgical approach toward alloying in rare earth permanent magnet systems

摘要

TiC is added as an alloying agent to Nd(sub 2)Fe(sub l4)B (2-14-1) system to both alter the solidification behavior of the melt and to act as pinning sites to control grain growth. The addition of TIC to 2-14-1 results in a factor of three reduction of the quench rate required to produce amorphous material. In addition, the crystallization temperature of the glass is enhanced leading to enhanced nucleation and finer grain size during crystallization. TIC additions to the stochiometric melt affect the range of primary solidification of the 2-14-1 phase. When TIC is added to the limit of its liquid solubility, the primary solidification range is move further from the stochiometric composition to the Nd rich region.