Phase equilibria and ternary intermetallic compound with L1 2 structure in Co-W-Ga system

Hibiki Chinen, Toshihiro Omori, Katsunari Oikawa, Ikuo Ohnuma, Ryosuke Kainuma, Kiyohito Ishida

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19 Citations (Scopus)

Abstract

Phase equilibria and stabilities of intermetallic phases appearing in the Co-rich portion of the Co-W-Ga ternary alloys were investigated and isothermal section diagrams at 1200, 1100, 1000, and 900 °C were determined. A fine cuboidal phase with an L1 2 structure was observed at 900 and 800 °C, where the composition of the new ternary compound obtained by aging at 900 °C for the Co-7.4W-12.0Ga alloy was Co-11.2W-11.4Ga (at.%). It was confirmed that this compound is metastable at 900 °C but is more stable at 800 °C. These results mean that the thermodynamic stability of the metastable Co 3W L1 2 phase, especially in the low temperature region, increases by the addition of Ga.

Original languageEnglish
Pages (from-to)587-594
Number of pages8
JournalJournal of Phase Equilibria and Diffusion
Volume30
Issue number6
DOIs
Publication statusPublished - 2009 Dec

Keywords

  • Co-W-Ga system
  • Intermetallics
  • Phase diagrams
  • Phase transformation
  • Precipitates

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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