Abstract：Permanent magnets with Fe-Nd-B bulk metallic glasses as precursors was fabricated. Trace zirconium was added into Fe70Nd10B20 ternary alloy and its adjacent composition. The samples were prepared by spin quenching and copper mold casting,and the glass forming ability was characterized by XRD and DSC. Then the Fe70Nd9B20Zr1 bulk metallic glasses were crystallized by annealing treatment. The crystallization phases were analyzed by XRD and the magnetic properties in various crystallization stages were characterized by VSM. The results show that the glass forming ability of the alloys is enhanced,and Fe-Nd-B-Zr bulk metallic glasses with critical diameter of 2 mm are obtained in alloys containing 1% atom fraction Zr. The optimum hard magnetic properties of Fe70Nd9B20Zr1 bulk metallic glasses can be achieved after annealing at 946 K for 600 s.The remanence (Br),coercive field (iHc) and maximum energy product (BH)max are 0.54 T,348 kA/m and 24.1 kJ/m3,respectively.This alloy system can be applied to directly synthesize nanocomposite permanent magnets by the process of casting and subsequent crystallization.
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