Abstract
A multi-step crystallization evolution has been observed in melt-spun nanocomposite Pr8Fe86B6 alloys, resulting in drastically different magnetic properties. The ribbons spun at different wheel speeds consist of different volume fraction of an amorphous structure. Upon annealing the partially amorphous ribbons, a single transformation directly into Pr2Fe14B phase has been detected since the pre-existed 2 : 14 : 1 nanocrystallites serve as nucleation centres. However, a multiple-stage structural evolution was observed in the fully amorphous ribbons that crystallize first into metastable TbCu7-type phase and then Pr2Fe23B3 phase before they finally transform into a mixture of Pr2Fe14B and α-Fe. The microstructure in the samples with partially amorphous precursors is much homogeneous and finer with the grain size around 10–30 nm.
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