期刊
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
卷 13, 期 4, 页码 215-222出版社
CASTINGS DEVELOPMENT CENTRE
DOI: 10.1080/13640461.2000.11819404
关键词
fracture behaviour; resonant vibration; morphology; eutectic silicon; intermetallic phases
The fracture behaviour of A356 alloys with different iron contents under resonant vibration has been investigated by examining the morphology of eutectic silicon and Fe-rich intermetallic phases. The test materials were prepared by varying the iron content within the range of 0.14 to 0.97 wt%. The experimental results shows that while the iron content is below 0.57 wt%, the Fe-rich intermetallic phases are mainly pi -Al8Mg3FeSi6 and alpha -Al15Fe3Si2 and there is no obvious difference in the fracture resistance under resonant vibration. However, when the specimen has higher iron content (0.97 wt%Fe), the fracture resistance drops due to the formation of beta -Al5FeSi. Hence, the beta -Al8FeSi morphology is more detrimental to the fracture resistance than that of pi -Al8Mg3FeSi6 or alpha -Al15Fe3Si2. The results indicate that the vibration fatigue cracks initiate at the surface and the fracture paths go predominantly through the silicon particles, and occasionally through the Fe-rich intermetallic phase particles. The detrimental beta -Al5FeSi becomes influential in the specimen with higher iron content. The results also show that the line intercepted density (LID) and projected crack intercepted density (PCID) values of Fe-rich intermetallic phases increased with increasing area fraction of Fe-rich intermetallic phases (or iron content). This shows that an increase in area fraction of Fe-rich intermetallic phases (or iron content) may promote the crack propagation and growth under resonant vibration.
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