Popis: |
Melt-spun R 6 (Fe-Nb) 88 B 6 ribbons with R = Nd, Pr, Dy, Tb have been studied via differential scanning calorimetry, differential thermal analysis, transmission electron microscopy, X-ray diffraction and magnetic measurements. The amorphous as-spun samples crystallize in two or more steps to a final microstructure consisting of a mixture of R 2 Fe 14 B 1 and α-Fe phases. The metastable phase in Nd, Pr, Dy samples was identified as Y 3 Fe 62 B 14 -type and in the Tb samples as TbCu 7 -type |