Microstructures and coarsening behavior of silicon particles in P/M Al-Si-Cu-Mg alloys containing Fe and Ni

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The microstructures and coarsening behavior of silicon particles in Al–Si–Cu–Mg alloys containing 5 mass% of Fe or 7.5 mass% of Ni produced by a powder metallurgy technique were investigated by means of optical and transmission electron microscopy. The effects of Fe or Ni on the coarsening of silicon particles have been examined for specimens annealed at 723, 778 and 793 K in relation to hardness and proof stress changes. Through TEM observations β–AlFeSi, β'–AlFeSi, Al<sub>16</sub>(MnFe)<sub>4</sub>Si<sub>3</sub>, AlCu<sub>2</sub>Fe<sub>7</sub> and Al<sub>3</sub>Fe phases are found to be present in the Fe containing alloy, while Al<sub>3</sub>Ni and Al<sub>3</sub>Ni<sub>2</sub> are detected in the Ni containing alloy. The mechanism of coarsening of silicon particles was discussed on the basis of the Lifshitz-Slyosov-Wagner theory (LSW theory). The activation energy for the coarsening of silicon particles in the alloys containing Fe or Ni is larger than that in the Fe-free or Ni-free alloy. The size distribution of Si particle is better described by the log-normal distribution, which is different from that expected from the LSW theory. The intermetallic compounds containing Fe or Ni effectively retard the coarsening of silicon particles, as well as increase the proof stress of the alloys.

収録刊行物

  • 軽金属

    軽金属 47(2), 90-97, 1997-02-28

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003795006
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    4139957
  • 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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