著者

桑水流 理 松村 圭悟 アギアルデソウザ ヴィニシウス 小林 正和 戸田 裕之

出版者

一般社団法人軽金属学会

雑誌

軽金属 (ISSN:04515994)

巻号頁・発行日

vol.64, no.11, pp.570-575, 2014

被引用文献数

4

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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.