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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
Presentation Title An Investigation on Si Refinement Mechanism of Hypereutectic Al-Si via Applying Ultrasonic Vibrations
Author(s) Reza Haghayeghi, Leandro C De Paula, Eugenio J Zoqui
On-Site Speaker (Planned) Reza Haghayeghi
Abstract Scope Al-Si alloys possess high abrasion resistance and low thermal coefficient which make them attractive for certain applications like as automotive industry. However, their ductility is affected by large Si particles size which results in poor mechanical properties. In this research, the effect of ultrasonic treatment on a hypereutectic Al-17% Si was evaluated. The results indicating the vibration shock waves would refine the Si primary particles effectively. The refinement mechanism is initiated by creating holes inside the primary Si particle where the complete refinement is acquired within 30 seconds of ultrasonic vibrations. Collison of hard particles like as intermetallic particles to primary Si due to suitable agitation along with strong convection force could end up to further Si particles fragmentation and refinement. Hole creation and intermetallic collisions to primary Si particles are supposed to be the primary stags for Si refinement by applying ultrasonic vibrations.
Proceedings Inclusion? Planned: Light Metals


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
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
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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