Alloy Development of High Toughness Mg-Gd-Y-Zn-Zr Alloys

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  • Yamada Kentaro
    Research Center for Advanced Magnesium Technology, Nagaoka University of Technology
  • Okubo Yoshiyuki
    Dept. Mechanical Engineering, Nagaoka University of Technology
  • Shiono Masashi
    Dept. Mechanical Engineering, Nagaoka University of Technology
  • Watanabe Hidetsuna
    Dept. Mechanical Engineering, Nagaoka University of Technology
  • Kamado Shigeharu
    Dept. Mechanical Engineering, Nagaoka University of Technology
  • Kojima Yo
    Dept. Mechanical Engineering, Nagaoka University of Technology

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The effects of zinc addition on microstructure evolution and mechanical properties of Mg-Gd-Y-(-Zr) based alloys are investigated in details using OM, TEM, Vickers hardness tests and tensile tests. Specific line-shaped structure is formed inside of matrix grain in the as-cast specimen. This structure is dissolved after a solution-treatment at 773 K. Instead of it, in the 0.3–1Zn alloy, the 14H LPSO structure is observed at grain boundaries of Mg matrix phases after the solution heat treatment. Metastable β′ phase is formed during subsequent aging treatment at 498 K. The 14H LPSO structure is stable and remained even after the aging treatment. These structure and phase coexist at the peak-aged condition in the microstructure. In cast- specimens, 0.2% proof stress and tensile strength slightly decreases with an addition of zinc up to 0.75 mol% and rapidly decreases over 1 mol% zinc addition. On the contrary, in rolled-specimens, addition of 0.3–1 mol% zinc improves mechanical properties in both strength and ductility significantly. It is found that the UTSs reach more than 400 MPa in the 0.3–1Zn alloys. This characteristic effect is considered to be the contribution of LPSO structure and its specific orientation relationship with matrix phase.

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