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

Jun Sato, Katsunari Oikawa, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Phase equilibria of solid phases in the Co-W system have been investigated by using two-phase alloys and diffusion couple technique. In addition, systematic studies of magnetic and martensitic transitions have been conducted by using Differential Scanning Calorimeter (DSC), Vibrating Sample Magnetometer (VSM) and dilatometric measurement. Two-phase separation into ferromagnetic αCo and paramagnetic αCo was confirmed in the Co-rich side. The Curie temperature and saturation magnetization decrease with increasing W content and those disappear at around 25 at%W. Furthermore, thermodynamic assessment by using CALPHAD approach has been performed. A set of thermodynamic values for describing the Gibbs energy of Co-W system yields a good agreement with experimental phase diagram. The calculation of metastable magnetically induced phase separation along the Curie temperature is also presented.

Original languageEnglish
Pages (from-to)992-1001
Number of pages10
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume68
Issue number12
DOIs
Publication statusPublished - 2004 Dec

Keywords

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

ASJC Scopus subject areas

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

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