Thermodynamic analysis on the phase separation of hcp phase in the mg-y-zn ternary system

Ryuichi Masumoto, Hiroshi Ohtani, Mitsuhiro Hasebe

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18 Citations (Scopus)


A thermodynamic analysis of the Mg-Y-Zn ternary system has been carried out, mainly focusing on the phase separation of the Mg-based hcp phase. The thermodynamic properties such as the formation enthalpy for the metastable hcp phase were estimated by using a first-principles meth od, because the solubility of Y and Zn was very limited in the stable phase diagrams. The calculations showed that, at least in the ground state the solid solution of hep had a strong tendency to phase separate between the Mg-rich side and the Y-Zn binary side. The characteristic long period stacking ordered (LPSO) structures observed in some Mg alloys might originate in this thermodynamic properties of the hcp solid solution.

Original languageEnglish
Pages (from-to)683-690
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number9
Publication statusPublished - 2009 Sep
Externally publishedYes


  • Calculation of phase diagrams (CALPHAD)
  • First-principles calculations
  • Long-period-stacking-orderd (LPSO) structures
  • Phase diagram
  • Thermodynamic analysis

ASJC Scopus subject areas

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


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