Effect of LPSO Phase-Stimulated Texture Evolution on Creep Resistance of Extruded Mg-Zn-Gd Alloys

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Abstract

The creep behavior and microstructures of extruded Mg<sub>97</sub>Zn<sub>1</sub>Gd<sub>2</sub> alloys with long period stacking ordered (LPSO) phase have been investigated. Creep properties of extruded alloys depend on pre-extrusion aging temperature; the optimum aging temperature to obtain excellent creep resistance is between 623 and 723 K. In this temperature range, a multimodal microstructure develops during subsequent extrusion at 623 K. The α-Mg matrix are bimodally grained; that is, it consists of fine DRXed grains and <10\bar{1}0>//ED fiber-textured coarse grains. The LPSO phase grains also develop the <10\bar{1}0>//ED fiber texture. Coarse block-shaped LPSO phase promotes dynamic recrystallization in α-Mg matrix via particle stimulated nucleation, while both fine plate-shaped LPSO phase and solute-segregated stacking faults (SFs) stimulate <10\bar{1}0>//ED fiber texture evolution in the α-Mg matrix. The creep strength increases with increasing area fraction of the <10\bar{1}0>//ED fiber textured region (coarse α-Mg grains and LPSO phase grains). Formation of plate-shaped LPSO phase and/or solute-segregated SFs before extrusion is most desirable for enhancing the creep properties of extruded Mg<sub>97</sub>Zn<sub>1</sub>Gd<sub>2</sub> alloys, due to LPSO phase-stimulated texture evolution.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54(5), 703-712, 2013-05-01

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10031168414
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    REV
  • ISSN
    13459678
  • NDL Article ID
    024456566
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  NDL  J-STAGE 
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