|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
||An Investigation on Si Refinement Mechanism of Hypereutectic Al-Si via Applying Ultrasonic Vibrations
||Reza Haghayeghi, Leandro C De Paula, Eugenio J Zoqui
|On-Site Speaker (Planned)
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.
||Planned: Light Metals