急冷凝固Mg_<97>Zn_1RE_2合金の微細組織観察 Microstructure observations of rapidly solidified Mg_<97>Zn_1RE_2 alloys

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The microstructure of ternary Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=La, Ce, Gd, Tb, Dy, Ho or Er) melt-spun alloys annealed at 573 K for 1.2 ks have been investigated in order to clarify the relationship between their microstructures and hardness. The Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> alloys consisted of Mg grains with diameter ranging from 0.7 to 2 μm. Also, several Mg–Zn–RE ternary phases were observed inside Mg grain and at grain boundary. Long period stacking (LPS) structure characterized as 14H-type was formed inside some Mg grains in the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=Gd, Tb, Dy, Ho or Er) alloys, respectively. The growth of 14H-type LPS structure from another Mg–Zn–RE ternary phase at grain boundary was recognized in the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=Gd or Er) alloys, and also the electron diffraction pattern clearly indicated that the relationship between 14H-type LPS structure and 2H-Mg was (001)<sub>2H–Mg</sub> // (0014)<sub>14H–Mg</sub>, indicating the 14H– and 2H–Mg were coexisted in the identical grain with certain relationship. On the other hands, although the LPS structure was not observed in the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=La or Ce) alloys, a number of the Mg–Zn–RE (RE=La or Ce) ternary phases with less than 50 nm dispersed in the Mg matrix, respectively. The higher hardness of the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=La or Ce) alloys than the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=Gd, Tb, Dy, Ho or Er) alloys originated in the formation of the numerous nano-size Mg–Zn–RE (RE=La or Ce) phases dispersed interior Mg grains in the Mg<sub>97</sub>Zn<sub>1</sub>RE<sub>2</sub> (RE=La or Ce) alloys.

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  • 軽金属  

    軽金属 56(10), 543-549, 2006-10-30 

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10018317337
  • 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
    8550893
  • 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  CJP引用  NDL  J-STAGE 
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