切削チップから作製したMg_<96>Zn_2Y_2合金押出材の組織と機械的特性 Microstructure and mechanical properties of Mg_<96>Zn_2Y_2 alloy prepared by extrusion of machined chips

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Hot extrusion has been carried out at 623 K on machined chips of Mg<sub>96</sub>Zn<sub>2</sub>Y<sub>2</sub> (at%) alloy. Microstructure and mechanical properties of the extruded Mg<sub>96</sub>Zn<sub>2</sub>Y<sub>2</sub> alloy have been investigated. The extruded Mg<sub>96</sub>Zn<sub>2</sub>Y<sub>2</sub> alloy was composed of α-Mg, Mg<sub>12</sub>ZnY and Mg<sub>3</sub>Zn<sub>3</sub>Y<sub>2</sub> phases, and the Mg grain had a mean grain size of 450 nm. The Mg<sub>12</sub>ZnY phase was frequently observed inside the fine Mg grains. Additionally, oxidation was occurred around cavities remained after extrusion. The extruded alloy exhibited a high 0.2% proof strength of 495 MPa and elongation of failure to 3% at room temperature. Grain refinement of Mg and dispersion of Mg<sub>12</sub>ZnY and Mg<sub>3</sub>Zn<sub>3</sub>Y<sub>2</sub> phases caused by hot extrusion lead to high strength at room temperature. Furthermore, the alloy extrusion also exhibited the superplasticity at temperatures of 623 K and 723 K with initial strain rates from 2×10<sup>−1</sup> s<sup>−1</sup> to 2×10<sup>−3</sup> s<sup>−1</sup>. And also the maximum elongation was 450% at 723 K with initial strain rate of 2×10<sup>−3</sup> s<sup>−1</sup>. The grain boundary sliding of Mg grains is dominant deformation mechanism for the alloy at high temperature ranges.

収録刊行物

  • 軽金属  

    軽金属 58(2), 54-57, 2008-02-28 

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10021988896
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    9391308
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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