Enhancement of hard magnetic properties in rapidly quenched Zr–Co–Fe–B ribbons through vacuum annealing

摘要: Abstract In the present work, importance of vacuum annealing on nanostructured Zr2Co9.5Fe1.5B ribbons fabricated through rapid solidification method was investigated for their hard magnetic properties. Optimized promotes formation rhombohedral Co5.1Zr phase, in addition to orthorhombic Co5.1Zr, fcc-Co, Co23Zr6 and Co3ZrB2 phases, which were formed via melt spinning. Remanent magnetization (Mr) coercivity (HC) found enhance post-annealing from 22.8 emu/g 1.24 kOe as melt-spun (MS) 50.3 1.64 kOe annealed at 550 °C/1 h. Furthermore, optimally contribute towards an increase energy product (BH)max ~ 2 MGOe comparison as-spun having 0.7 MGOe. Annealing process leads enhancement properties crystallization phase. To account coercivity, mechanism optimized ribbon also studied is attributed nucleation deduced measurement minor loops. The effect conditions phase evolution, microstructure behaviour MS ribbons, indicates that appropriate control thermal schedule a key achieve high remanence, well product. could serve potential candidate rare-earth free permanent magnet materials.