Investigation on structures of mono-sized particles prepared by Pulsated Orifice Ejection Method and the critical cooling rate for forming glass phase structure

Ayako Miura, Wei Dong, Masahiro Fukue, Noriharu Yodoshi, Takamichi Miyazaki, Akira Kawasaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Mono-sized [(Fe0.5Co0.5)0.75B 0.2Si0.05]96swNb4 alloy particles with desired particle size and high sphericity have been prepared by Pulsated Orifice Ejection Method (POEM). Each particle has uniform compositional distribution along with the same composition during processing. Phase transition of a particle from fully amorphous to amorphous/crystalline and then fully crystalline shows that the diameter of a single fully amorphous particle is less than 300 μm in Ar atmosphere and 700 μm in He atmosphere. The critical diameter of a fully amorphous phase particle shifts toward larger diameter with an increase in the initial melt temperature. The critical cooling rate to realize fully amorphous phase is estimated to be in the range of (700-900 K x s-1), which only depends on the initial melt temperature, irrespective of the atmospheres gases.

Original languageEnglish
Pages (from-to)636-642
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume73
Issue number8
DOIs
Publication statusPublished - 2009 Aug

Keywords

  • Containerless solidification
  • Cooling rate
  • Crystallization
  • Glass phase structure
  • Mono-sized particle

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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