TY - JOUR
T1 - Electron diffraction study on the long-range-ordered metastable Fe-Nd-B phase
AU - Konno, Toyohiko J.
AU - Uehara, Minoru
AU - Hirosawa, Satoshi
AU - Sumiyama, Kenji
AU - Suzuki, Kenji
N1 - Funding Information:
One of the authors (T. J. K.) is grateful for financial support provided by The Kazato Research Foundation.
PY - 1999/10
Y1 - 1999/10
N2 - 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.
AB - 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.
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U2 - 10.1080/01418619908214292
DO - 10.1080/01418619908214292
M3 - Article
AN - SCOPUS:0040113490
SN - 0141-8610
VL - 79
SP - 2413
EP - 2436
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
IS - 10
ER -