Refinement of Thermodynamic Parameters of the Mg₂₄Y₅, W and H Phases in the Mg-Zn-Y System

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  • Minamoto Satoshi
    Science and Engineering Systems Division, ITOCHU Techno-Solutions Corporation (CTC)
  • Horiuchi Toshiaki
    Department of Mechanical Engineering Faculty of Engineering, Hokkaido University of Science
  • Miura Seiji
    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

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タイトル別名
  • Refinement of Thermodynamic Parameters of the Mg<sub>24</sub>Y<sub>5</sub>, <i>W</i> and <i>H</i> Phases in the Mg-Zn-Y System

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The Mg-Zn-Y alloy shows excellent mechanical properties which can be achieved by combining LPSO phase (known as X phase) and an icosahedral quasicrystal phase (I and Z phases) in Mg solid solution (α phase). Thermodynamic data for the binary/ternary compounds Mg24Y5, X, W and H have to be critically assessed to obtain accurate information of three-phase equilibrium in order to understand equilibria among these phases. In this research, we focused on developing CALPHAD (CALculation of PHAse Diagrams) thermodynamic database to evaluate phase diagrams for the Mg-Zn-Y system. Especially thermodynamic models for the Mg24Y5, W and H phases have been determined based on crystallographic data. Then thermodynamic parameters have been assessed to yield experimental data from EPMA/WDS, SEM, TEM and X-Ray diffraction.

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 56 (10), 1670-1674, 2015

    公益社団法人 日本金属学会

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