微量のりんを含有する高純度Al-Si共晶合金の組織 Microstructure of high purity Al-Si eutectic alloys containing minute amounts of phosphorus

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The effect of phosphorus on the silicon particle structure during solidification has been investigated for Al–Si eutectic alloy. Phosphorus content less than about 5 ppm refines the microstructure. The eutectic silicon exhibits a very finely divided lamellar structure. A few dendrites of primary aluminum crystal are also observed showing a slightly hypoeutectic behavior for this composition. For phosphorus content not less than 10 ppm, the coarsening of eutectic structure was observed. Then coarse crystals of plate-like silicon appear and the eutectic silicon of acicular shape becomes much coarser than that in the case of the pure alloy. Al–12.5%Si alloy containing phosphorus forms small crystals of aluminum phosphide in the molten aluminum before solidification, which act as effective nuclei for silicon and promote crystallisation of plate-like silicon at the start of solidification. The fact that undercooling of eutectic solidification becomes smaller for phosphorus containing alloy supports the above idea.

収録刊行物

  • 軽金属

    軽金属 46(8), 377-382, 1996-08-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003794301
  • 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
    4021307
  • 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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