Abstract
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.
Original language | English |
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Pages (from-to) | 570-575 |
Number of pages | 6 |
Journal | Keikinzoku/Journal of Japan Institute of Light Metals |
Volume | 64 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- Aluminum alloy
- Casting defect
- Cracking
- Fatigue
- X-ray computed tomography
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry