Phase-Field Simulation of Spinodal Decomposition on Metastable Hexagonal Close-Packed Phase in Magnesium-Yttrium-Zinc Alloy

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Abstract

It has been proposed that a long-period stacking ordered (LPSO) structure is responsible for the excellent mechanical properties of lightweight alloys of Mg–Zn–RE (RE: rare earth elements) system. The phase separation of the metastable hexagonal close-packed (hcp) phase in the Mg–Y–Zn alloy was simulated by means of the phase-field method to discuss the mechanism of formation of the LPSO structure. Near the Mg-corner of the Mg–Y–Zn ternary system, metastable spinodal decomposition occurs before conventional spinodal decomposition, i.e., the supersaturated solid solution of Mg–7 at% Y–7 at% Zn alloy separates into two phases: Mg–12 at% Y and Mg–17 at% Zn. The resulting microstructure has a lamellar morphology, elongated along the [0001] direction of the hcp phase, with a wavelength of ∼7 nm. The calculated orientation of the lamellar is completely different from that of the LPSO structure. Therefore, it is difficult to explain the formation of the LPSO structure directly in terms of a spinodal decomposition of the hcp phase in the Mg–Y–Zn ternary system.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54(5), 661-667, 2013-05-01

    The Japan Institute of Metals and Materials

References:  16

  • <no title>

    KAWAMURA Y.

    Mater. Trans. 42, 1172-1176, 2001

    Cited by (1)

  • <no title>

    INOUE A.

    J. Mater. Res. 16, 1894-1900, 2001

    Cited by (1)

  • <no title>

    ABE E.

    Acta Mater. 50, 3845-3857, 2002

    Cited by (1)

  • <no title>

    ITOI T.

    Scr. Mater. 51, 107-111, 2004

    Cited by (1)

  • <no title>

    MATSUDA M.

    Mater. Sci. Eng. A 393, 269-274, 2005

    Cited by (1)

  • <no title>

    KAWAMURA Y.

    Mater. Trans. 48, 2986-2992, 2007

    Cited by (1)

  • <no title>

    LEE J.

    Mater. Trans. 50, 222-225, 2009

    Cited by (1)

  • <no title>

    ABE E.

    Philos. Mag. Lett. 91, 690-696, 2011

    Cited by (1)

  • <no title>

    MASUMOTO R.

    J. Jpn. Inst. Metals. 73, 683-690, 2009

    Cited by (1)

  • <no title>

    KOYAMA T.

    Computational Materials Design : Simulation of Microstructures, 2011

    Cited by (1)

  • <no title>

    PROVATAS N.

    Phase-Field Methods in Materials Science and Engineering, 2010

    Cited by (1)

  • <no title>

    ABE E.

    Computational Materials Design : Computational Thermodynamics, 2011

    Cited by (1)

  • <no title>

    SAUNDERS N.

    CALPHAD (Calculation of Phase Diagrams) : A Comprehensive Guide, 1998

    Cited by (1)

  • <no title>

    MURA T.

    Micromechanics of Defects in Solids, 1991

    Cited by (1)

  • <no title>

    KHACHATURYAN A. G.

    Theory of Structural Transformations in Solids, 2008

    Cited by (1)

  • <no title>

    Japan Institute of Metals

    Metals Data Book, 2004

    Cited by (1)

Codes

  • NII Article ID (NAID)
    10031168407
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    REV
  • ISSN
    13459678
  • NDL Article ID
    024456314
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  NDL  J-STAGE 
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