Significant coercivity enhancement of Ti doping in Nd-Ce-Fe-B melt spun alloys

The influences of doping Ti on the phases, microstructures and magnetic properties are systematically investigated in (Nd0.8Ce0.2)(12)Fe82-xTixB6 melt spun alloys. It is found that Ti could promote the glass forming ability of the studied alloys and increase the stability of the amorphous phase. Significant coercivity enhancement due to Ti doping is observed. The coercivity increases from 9.5 kOe for Ti-free sample to 18.5 kOe with Ti addition of 5 at%, and further reaches to 19.5 kOe when Ti addition rises to 7 at%. The Fe2Ti phase is found to precipitate in the 2-14-1 phase grain boundaries investigated by transmission electron microscopy (TEM) and high angle annular dark field (HAADF). With the Ti contents increasing, the precipitated phase becomes larger and more continuous, which is responsible for the huge improvement of the coercivity.