Phase Relations among D0₃, α-Mg, and Long-Period Stacking Orders in Mg₈₅Zn₆Y₉ Alloy under 3 GPa (Special Issue on Long-Period Stacking Ordered Structure and Its Related Materials(2)) Phase Relations among D0<sub>3</sub>, α-Mg, and Long-Period Stacking Orders in Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy under 3 GPa

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Abstract

The crystal structures of Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> alloy under 3 GPa were investigated between room temperature and 973 K using <i>in situ</i> X-ray diffraction (XRD). In addition, the crystal structures and microstructures of Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> alloys that were recovered after being heated at various temperatures under 3 GPa were also investigated. The <i>in situ</i> XRD analysis results indicated that 10H- and 18R-type long-period stacking orders (LPSOs) were stable below 673 K under 3 GPa; however, the D0<sub>3</sub> and α-Mg structures, which were not observed at ambient pressure, emerged at 873 K in the sample under 3 GPa. When the temperature was increased to 973 K, the D0<sub>3</sub> and α-Mg phases fused. The D0<sub>3</sub> and α-Mg phases were also confirmed to be present in Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> alloy that was recovered after being heated at 873 K under 3 GPa. In contrast, the XRD pattern of the Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> alloy that was recovered after being heated at 973 K under 3 GPa indicated the presence of the 18R-type LPSO, D0<sub>3</sub>, and α-Mg structures. These results indicate that three phases—18R-type LPSO, D0<sub>3</sub>, and α-Mg—were formed during cooling from the molten state at 3 GPa. These results further suggest that the D0<sub>3</sub>, α-Mg, and 18R-type LPSO are energetically very similar under 3 GPa.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 56(7), 910-913, 2015

    The Japan Institute of Metals and Materials

Codes

  • NII Article ID (NAID)
    130005083570
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • ISSN
    1345-9678
  • NDL Article ID
    026564328
  • NDL Call No.
    Z53-J286
  • Data Source
    NDL  J-STAGE 
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