Crystallization kinetics of Ti-doped Nd<sub>2</sub>Fe<sub>14</sub>B/α-Fe nanocomposite permanent magnets

Nanocomposite magnet consisting of a fine mixture magnetically hard and soft phase has received much attention for potential permanent development. One the important requirements alloys to exhibit excellent magnetic properties is nanocrystalline grain size. The phases can simultaneously achieve ideal nanoscale composites. effect Ti additions in amorphous crystallization process exchange-coupled nanocomposite Nd<sub>2</sub>Fe<sub>14</sub>B/α-Fe prepared by melt spinning investigated. results show that change kinetics NdFeB melt-spun ribbons. increase activation energy α-Fe contrarily reduce metastable 1∶7 phase, so growth speed decreases stably precipitate from phase. When annealing temperature increases, decomposed into Nd<sub>2</sub>Fe<sub>14</sub>B microstructure observation shows grains doped with are uniform, an average size about 20 nm, no particularly large particles appear. optimal property (<i>BH</i>)<sub>max</sub> = 12 MG·Oe (1 G 10<sup>–4</sup> T, 1 Oe 79.57795 A/m) when addition 1.0%.