Mg-Zr母合金によるマグネシウムの結晶粒微細化 Grain refining of pure magnesium by adding Mg-Zr master alloy

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Effects of Zr addition via Mg–Zr master alloy on the grain refinment in the magnesium ingots was investigated in view of grain size and concentration of soluble Zr. Specimens were prepared by adding Zr up to 2.0 mass% at temperatures 993 K, 1033 K and 1073 K, and examined using optical microscope (OM), scanning electron microscope (SEM) and electron-probe micro analyzer (EPMA). It was found that concentration of soluble Zr was almost independent of the melt temperature between 993 K to 1073 K, where the master alloy was introduced. Grain size was decreased with increasing soluble Zr content exponentially and, at 0.4mass%Zr or more, grain size become constant at about 30 μm (permanent molded castings) and 70 μm (shell molded castings), even if the peritectic composition, 0.6 mass%Zr was not reached. SEM and EPMA observation revealed substructure including Zr-enriched cored area, which is formed characteristically; i.e., in the most cases, metallic Zr particle is located at the center of the core, surrounded by several rings, each of which is made up by Zr enriched Mg solid solution. Such experimental results suggest that some undis-solved Zr particles play an important role in the nucleation of the observed ring structure and this grain refinement pro-ceses is based on non-equilibrium solidification.

収録刊行物

  • 軽金属

    軽金属 47(12), 679-684, 1997-12-30

    The Japan Institute of Light Metals

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  • 純マグネシウムの蒸留と溶解における不純物の挙動

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被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10003796351
  • 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
    4367206
  • 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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