PrFeCoB-based magnets derived from bulk alloy glass

Abstract The magnetic properties of nanocomposite Fe 61 Co 13.5 Zr 1 Pr 4.5− x Dy x B 20 ( x = 0 , 1) magnets, derived by devitrification annealing the thick amorphous melt-spun ribbon and suction-cast 1 and 3 mm outer diameter thin walled tube samples, are presented. The Zr addition was intended to improve the glass forming ability of similar Fe–Co-RE-B alloys studied by us earlier, while the Dy was substituted to enhance the magnetocrystalline anisotropy field. The results revealed useful magnetic hardening and modest remanence enhancement of the samples. In contrast, 1 mm dia rod shaped castings were not fully amorphous.