Abstract
Abstract We report a new long-range ordered phase formed in the spherulites of an annealed melt-spun Fe89Nd7B4 ribbon. This ordered phase appears in the intermediate stage of the crystallization process of the amorphous alloy and is thus metastable. The unit cell is based on the D03 structure, in which 4a or 4b (multiplicity and Wyckoff letter) sites are occupied by Nd and a portion of Fe atoms. Long-range ordering occurs in the [100] and [110] directions, with respective displacement vectors of ¼[111] and ½[001] of the D03 unit cell at antiphase boundaries. The [110] diffraction pattern clearly indicated the presence of the two-dimensional long-range order with superperiods M = 5.5 and 6.0 in the [001] and [110] directions respectively. Dark-field images revealed that the spherulites initially crystallize into a disordered bcc Fe phase and that the ordering proceeds as the spherulites grow.
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