Nanoscale precipitates and phase transformations in a rapidly-solidified Fe-Pt-B amorphous alloy

Dmitri V. Louzguine-Luzgin, Wei Zhang, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The phase transformations in a rapidly solidified (Fe0.75Pt 0.25)75B25 alloy on heating were studied by X-ray diffractometry, differential scanning and isothermal calorimetries. An as-solidified structure was examined by transmission electron microscopy (TEM). The results of TEM, including nano-beam diffraction and high-resolution imaging, clearly indicate the existence of nano-scale cubic cF4 Fe(Pt) solid solution particles within the as-solidified amorphous matrix. The particles of the cF4 Fe(Pt) phase start growing at elevated temperature and undergo ordering forming a tP4 FePt compound followed by the precipitation of a tI12 Fe2B phase from the residual amorphous matrix. The ordering of the cubic phase takes place after an incubation period which allows to anticipate a nucleation and growth mechanism. This process is followed by further growth of the particles. The transformation behavior on heating is studied in detail.

Original languageEnglish
Pages (from-to)78-83
Number of pages6
JournalJournal of Alloys and Compounds
Volume402
Issue number1-2
DOIs
Publication statusPublished - 2005 Oct 27

Keywords

  • Amorphous materials
  • Calorimetry
  • Liquid quenching
  • Nano-structures
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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