OS1204 放射光CTによるアルミニウム鋳造合金の低サイクル疲労破壊挙動評価

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  • OS1204 Fracture Behavior Evaluation of Cast Aluminum Alloy under Low Cycle Fatigue using Synchrotron Radiation CT

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The crack initiation mechanism of cast aluminum alloy was addressed to quantitatively evaluate the fatigue strength. The synchrotron radiation microtomography was employed to visualize the three-dimensional damage around pores and Si particles. Two types of specimens were prepared for the low cycle fatigue test. The temperature of solution treatment was different, and it yields a difference in the shape of Si particles. After a certain cycles of fatigue, a catastrophic damage around many Si particles happened and they connected to each other so as to form a crack. The scanning electron microscopy after the test showed that the type of damage was the break of long Si particles or the interface debonding around round Si particles.

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