Al-Li-Mg系合金の凝固および熱処理組織に及ぼすSi量の影響 Effect of Si content on solidified and heat treated structure of Al-Li-Mg casting alloys

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The effects of Li and Si contents on the solidified and heat treated structures of Al–2.5~5 mass%Li–O.7~7 mass%Si–1 mass%Mg alloys cast into metal and sand molds were investigated by scanning electron microscopy, specific heat curve measurement, X-ray diffraction and micro-vickers hardness measurement. AlLiSi compounds crystallize as primary and eutectic phases and disperse at the inter-dendrite arm, and they remaind intact after solution treatment at 803 K for 36 ks. The crystallization of primary and eutectic Si phases, and Mg<sub>2</sub>Si phases were not observed. The morphology of the AlLiSi phase is triangular plate-like in the alloys contained more than 3 mass%Si, is needle-like in the alloys contained 1~3 mass%Si and changed to small rod-like in the alloys contained less than 1 mass%Si. By the amount decrease in the solubility of Li in the matrix the crystallization of AlLiSi phase decreases and brings the decrease or retardation in age hardening by δ' (Al<sub>3</sub>Li) precipitation. The mechanical strength becomes higher with decreasing the amount of AlLiSi phase and δ (AlLi) equilibrium phase.

収録刊行物

  • 軽金属

    軽金属 47(3), 158-163, 1997-03-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003795140
  • 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
    4172737
  • 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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