低サイクル疲労を受けるアルミニウム鋳造合金の三次元き裂発生挙動

DOI Web Site 被引用文献3件 参考文献11件

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  • Three-dimensional crack initiation behavior of cast aluminum alloy under low-cycle fatigue
  • テイサイクル ヒロウ オ ウケル アルミニウム チュウゾウ ゴウキン ノ サンジゲン キレツ ハッセイ キョドウ

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抄録

The crack initiation mechanism of cast aluminum alloy was addressed to quantitatively evaluate the fatigue strength. We employed the synchrotron radiation microtomography to visualize the three-dimensional damages around pores and silicon particles. Two types of specimens underwent a low-cycle fatigue test. The temperature of solution treatment was different, and it yielded a difference in the shape, size and distribution of silicon particles. After a certain cycles of fatigue, a catastrophic damage around many silicon particles occurred, and they connected to each other so as to form a crack especially within the high stressed region around a relatively large pore. The scanning electron microscopy after the test showed that the type of damage was the breakage of long-shaped silicon particles or the aluminum–silicon interface debonding of round silicon particles. The high temperature solution treatment facilitated the interface debonding by the enlargement of silicon particles.

収録刊行物

  • 軽金属

    軽金属 64 (11), 570-575, 2014

    一般社団法人 軽金属学会

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