|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
||Quantifying Effects of Grain Refiner Addition on Fe-rich Intermetallics Solidification of Al-Si-Cu Alloys Using In Situ Synchrotron X-ray Tomography
||Surada Chuaypradit, Chedtha Puncreobutr, André Phillion, Julie L. Fife, Peter D. Lee
|On-Site Speaker (Planned)
The presence of Fe-rich intermetallics, particularly plate-like β-Al<SUB>5</SUB>FeSi, in aluminium alloy cast components can often limit final fatigue life. There is an on-going effort to control these detrimental phases formation by the additions of trace elements and Al–Ti–B grain refiner. However, the role of grain refinement on the formation of intermetallics is still unclear and conflicting results exist. To gain better understanding, <I>in situ</I> synchrotron X-ray tomographic microscopy experiments were performed for a range of iron levels and grain refining conditions in a commercial Al-Si-Cu alloy. Three-dimensional microstructure evolution as well as nucleation and growth of intermetallics were quantified. The interaction of the intermetallics with the refined primary grains were also examined. The results illustrate that grain refinement strongly affects volume fraction and size of Fe-rich intermetallics but show no evidence that it could alter precipitation sequence or intermetallic form. The possible mechanisms for these effects are discussed.
||Planned: Light Metals