Electron diffraction study on the long-range-ordered metastable Fe-Nd-B phase

Toyohiko J. Konno, Minoru Uehara, Satoshi Hirosawa, Kenji Sumiyama, Kenji Suzuki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report a new long-range ordered phase formed in the spherulites of an annealed melt-spun Fe89Nd7B4ribbon. 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 D03structure, 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 1/4[111] and 1/2[001] of the D03unit 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.

Original languageEnglish
Pages (from-to)2413-2436
Number of pages24
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Issue number10
Publication statusPublished - 1999 Oct


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