Effect of lanthanide element on glass-forming ability and local atomic structure of Fe-Co-(Ln)-B amorphous alloys

Muneyuki Imafuku, Kenichi Yaoita, Shigeo Sato, Wei Zhang, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The glass-forming ability and the local ordering structures of Fe70Co10B20 and Fe67Co10Ln3B20 (Ln=Sm, Tb or Dy) alloys have been studied by differential scanning calorimetry (DSC), density measurement and X-ray diffraction method. The supercooled liquid region, defined by the temperature interval ΔTx between glass transition temperature Tg and onset crystallization temperature Tx, appears and is extended by the addition of lanthanide element in Fe-Co-B systems. ΔTx (ΔTx=Tx-Tg) is 32 K for Fe67Co10Sm3B20, 36 K for Fe67Co10Tb3B20 and 38 K for Fe67Co10Dy3B20. The packing fraction, defined by the ratio of total volume of atoms to the volume of a cell, increases by a few percent in these alloys. The least-squares refining analysis for interference functions as well as the usual radial distribution function analysis shows that the coordination number of transition metals around Fe decreases by the addition of the lanthanide element whereas the change in the coordination number of transition metals around B is not clearly observed within the experimental uncertainty. The lanthanide element is considered to play an important role in forming a dense packing structure so as to rearrange the network of local ordering units of (Fe, Co)-B in these alloys.

Original languageEnglish
Pages (from-to)1144-1148
Number of pages5
JournalMaterials Transactions, JIM
Volume40
Issue number10
DOIs
Publication statusPublished - 1999 Oct

Keywords

  • Glass transition
  • Iron-based amorphous alloy
  • Iron-cobalt-lanthanide metal-boron system
  • Local atomic structure
  • Packing fraction
  • Supercooled liquid region
  • X-ray diffraction

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Effect of lanthanide element on glass-forming ability and local atomic structure of Fe-Co-(Ln)-B amorphous alloys'. Together they form a unique fingerprint.

Cite this