Experimental verification of magnetically induced phase separation in αCo phase and thermodynamic calculations of phase equilibria in the Co-W system

Jun Sato, Katsunari Oikawa, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Phase equilibria of solid phases in the Co-W system were investigated using two-phase alloys and the diffusion couple technique. In addition, systematic studies of magnetic and martensitic transitions were conducted by Differential Scanning Calorimetry (DSC), Vibrating Sample Magnetomety (VSM) and dilatometric measurement. Phase separation into ferromagnetic αCo and paramagnetic αCo was confirmed on the Co-rich side. The Curie temperature and saturation magnetization decreased with increasing W content and vanished at around 25 at%W. Furthermore, thermodynamic assessment by the CALPHAD approach was performed. A set of thermodynamic values describing the Gibbs energy of the Co-W system was in good agreement with the experimental phase diagram. Calculation of metastable magnetically induced phase separation in the hcp phase along the Curie temperature was also performed.

Original languageEnglish
Pages (from-to)1199-1207
Number of pages9
JournalMaterials Transactions
Volume46
Issue number6
DOIs
Publication statusPublished - 2005 Jun

Keywords

  • CALPHAD
  • Cobalt-tungsten alloy
  • Magnetic transition
  • Martensitic transition
  • Phase diagram
  • Phase separation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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