Nucleation of Ω Phase in an Al-Cu-Mg Alloy Containing Small Additions of Ag

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The role of small additions of Ag in increasing the nucleation frequency of a plate shaped precipitate having {111}<SUB>Al</SUB> habit plane, designated <I>Ω</I>, in an Al–Cu–Mg alloy has been investigated using transmission electron microscopy (TEM), electron diffraction and energy dispersive X-ray spectroscopy. The results provide for the first time direct evidence showing association of <I>Ω</I> plates with small Ag-rich precipitates of the constituent binary Al–Ag system during the early stages of artificial aging. Given the strong attraction between Ag and Mg owing to the large difference in electronegativity between them, Mg simultaneously combines with the Ag-rich precipitates formed on the {111}<SUB>Al</SUB> matrix planes, and makes such sites suitable for the heterogeneous nucleation of <I>Ω</I> phase.

収録刊行物

  • Materials transactions, JIM

    Materials transactions, JIM 38(5), 478-482, 1997-05

    社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10002452724
  • NII書誌ID(NCID)
    AA10699969
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09161821
  • NDL 記事登録ID
    4231138
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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