Crack Propagation Behavior of A356 and Al-1Si-0.3Mg Aluminum Alloys under Resonant Vibration

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By using the A356 aluminum alloy (Al–7Si–0.3Mg) with dispersed eutectic silicon particles and the single-phase Al–1Si–0.3Mg alloy, this study was carried out to investigate how eutectic silicon influences the crack propagation behavior under resonant vibrations in natural and overaging conditions. In the natural aging condition, the cracking modes of these two alloys resemble each other and the cracks through slip bands occur. Besides slip band cracking, as the cracks in the A356 alloy pass through the interdendritic zones with eutectic silicon clustering, they propagate through broken silicon particles or silicon particle/matrix interfaces. So, the resistance to crack growth of the Al–1Si–0.3Mg alloy is slightly higher than A356 alloy. For the overaging condition, the crack paths of these two alloys obviously differ from each other. The cracking mode of the Al–1Si–0.3Mg alloy largely displays the striation feature. However, owing to the existence of brittle silicon particles, the cracking exhibits a preferred direction towards the silicon particles and runs through broken silicon particles or silicon particle/matrix interfaces. Thus, the cracking resistance of A356 alloy is significantly lower than Al–1Si–0.3Mg alloy. Moreover, the crack growth resistance of the Al–1Si–0.3Mg alloy in the natural aging condition is slightly higher than that under the overaging condition. In contrast, for the A356 alloy, the former shows much higher resistance than the latter.

収録刊行物

  • Materials transactions, JIM

    Materials transactions, JIM 40(4), 283-289, 1999-04

    社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10003806062
  • 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
    4718890
  • 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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