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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
Presentation Title Quantifying Effects of Grain Refiner Addition on Fe-rich Intermetallics Solidification of Al-Si-Cu Alloys Using In Situ Synchrotron X-ray Tomography
Author(s) Surada Chuaypradit, Chedtha Puncreobutr, André Phillion, Julie L. Fife, Peter D. Lee
On-Site Speaker (Planned) Surada Chuaypradit
Abstract Scope The presence of Fe-rich intermetallics, particularly plate-like β-Al5FeSi, 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, in situ 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.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Investigation on Si Refinement Mechanism of Hypereutectic Al-Si via Applying Ultrasonic Vibrations
C-45: Homogenization Treatment of High-strength Aluminum Alloy with Casting Processes
Effective Nanoparticles Feeding Treatment in Casting of A356/ZrO2 Nano-reinforced Composite
Effects of Microstructure on Hot Cracking Behavior in Al-Zn-Mg-Cu Alloys
Impact of Inlet Flow On Macrosegregation Formation Accounting for Grain Motion and Morphology Evolution in DC Casting Of Aluminium
In-situ Study of Solidification Kinetics of Al-Cu and Al-Ce Alloys with Application of Neutron Diffraction
Observations of Microhardness and Segregation in Al-Zn and Zn-Al Specimens with Columnar-to-Equiaxed Grain Transition
Quantifying Effects of Grain Refiner Addition on Fe-rich Intermetallics Solidification of Al-Si-Cu Alloys Using In Situ Synchrotron X-ray Tomography

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