Abstract
The glass formation in Fe-rich ternary Fe-B-Nd and quaternary (Fe,B,Nd)96Nb4alloys has been studied and the best ternary and quaternary glass formers are located at Fe67B23Nd10and (Fe68B25Nd7)Nb4with critical diameters of 1 and 4 mm, respectively. For (Fe,B,Nd)96Nb4alloys, the competing phases with glass were identified by monitoring the microstructure change. Fe14Nd2B was discovered to be one competing phase, which is the principle magnetic phase for Nd-Fe-B hard magnets. Composites with uniformly distributed Fe14Nd2B were formed for quaternary alloys with a diameter of 1.5 to 3 mm. Bulk hard magnets could be obtained by directly annealing the composites in a compositional area. A hard magnet with a coercivity of 1,100 kAm−1and a maximum energy product, (BH)max, of 33 kJm–3was obtained at (Fe67B23Nd10)96Nb4by annealing. The combination of hard magnetic properties and the large critical sample size may make these alloys a commercially viable candidate for industrial applications.
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