Experimental Study on Phase Equilibria in the Vicinity of X, W and H Phases in the Mg-Zn-Y Ternary System

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Abstract

Three Mg–Zn–Y ternary alloys in the vicinity of <i>X</i>, <i>W</i> and <i>H</i> phases were prepared and were isothermally heat treated at 833, 793, 723 and 673 K to attain thermodynamic equilibrium. The microstructure was observed using electron probe microanalysis and transmission electron microscopy, and the chemical compositions of the equilibrium phases were analyzed using wavelength dispersive X-ray spectroscopy. The crystal structure of the <i>W</i> and <i>H</i> phases were analyzed using X-ray diffraction, electron back scattering diffraction and electron diffraction pattern obtained by transmission electron microscopy. The Mg–Zn–Y ternary phase diagrams of the isothermal section were also calculated using the Thermo-Calc to compare with the experimental results. The <i>X</i> phase was found to be solidified in high-Mg alloys not in a manner of eutectic reaction as reported previously but in a manner of peritectic reaction. The <i>W</i> phase has a Heusler (L2<sub>1</sub>) type crystal structure with a stoichiometric composition of Mg<sub>1</sub>Zn<sub>2</sub>Y<sub>1</sub>, and fine mesh texture composed of α (Mg) and <i>W</i> phases was occasionally observed in non-equilibrium solidified parts, implying that the transient <i>W</i> phase has potential to be utilized as an additional strengthening phase. The equilibrium chemical composition of the <i>H</i> phase with a hexagonal crystal structure (P6<sub>3</sub>/mmc) was found to be different from that of the previous reports.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54(5), 641-646, 2013-05-01

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10031168404
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    REV
  • ISSN
    13459678
  • NDL Article ID
    024456165
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  NDL  J-STAGE 
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