Bulk nanocomposite permanent magnets produced by crystallization of (Fe,Co)–(Nd,Dy)–B bulk glassy alloy

Abstract

The glass-forming ability, thermal stability, and magnetic properties have been investigated for an Fe67Co9.4Nd3.1Dy0.5B20 glassy alloy with a large supercooled liquid of 48 K before crystallization prepared by copper mold casting. The glassy phase is formed in a rod form with a diameter of 0.5 mm. The crystallized nanocomposite structure consists of Fe3B, α-Fe, and Nd2Fe14B phases, and the remanence (Br), coercivity (iHc) and maximum energy product (BH)max are 1.19 T, 244 kA/m, and 92.7 kJ/m3, respectively, for the rod of 0.5 mm in diameter annealed at 913 K for 600 s.