ダイカストAl-Si-Cu合金鋳物の疲労き裂伝播特性に及ぼすミクロ組織の影響 Effect of microstructure on fatigue crack propagation characteristic of Al-Si-Cu die casting alloys

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Fatigue crack propagation characteristics of a eutectic and two hypereutectic Al–Si–Cu die casting alloys were investigated, where the stress ratio was 0.1 and the load frequency was 50 Hz at an ambient temperature. Relationships between fatigue crack propagation characteristic and microstructure have been dicussed. The fatigue crack propagation rate decreases with increasing Si content in a low stress intensity factor range, Δ<i>K</i>. In this range, the crack propagation rate is very slow because it is considered to increase effects of crack deflection and branching induced crack closures with increasing Si content. At a high Δ<i>K</i>, because the effects of crack closures are decreased, the higher the Si content, the higher the fatigue crack propagation rate becomes. In this study, the fatigue crack propagation rate for the Al–15%Si–T5 alloy becomes higher than the other two alloys. It is considered to decrease effects of crack deflection and branching induced crack closures with many intermetallic compounds in the Al–15%Si–T5 alloy. The fractographic study on fractured specimens after fatigue crack propagation tests reveals the fracture surfaces consisting of the cleavage fractures of Si and intermetallic compound particles, and the striation pattern in α–aluminum.

収録刊行物

  • 軽金属

    軽金属 49(9), 443-449, 1999-09

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10002763346
  • 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
    4858593
  • 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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