About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
High Speed Observations of Ultrasonic Fragmentation and De-agglomeration Process of Free-floating Intermetallics and Oxide Particles |
Author(s) |
Abhinav Priyadarshi, Tungky Subroto, Koulis Pericleous, Dmitry Eskin, John Durodola, Iakovos Tzanakis |
On-Site Speaker (Planned) |
Abhinav Priyadarshi |
Abstract Scope |
The need for lightweight and high-strength advance materials in the form of metal-matrix composites with micron-sized particulate reinforcements has received considerable attention within automotive and aerospace industry. Ultrasonic melt treatment of Al-alloys offers a sustainable and eco-friendly approach to produce structural refinement through enhanced heterogeneous nucleation obtained from combined effect of sono-fragmentation of primary intermetallic/dendrites and de-agglomeration of non-metallic oxides/inclusions. However, owing to complexity of the process, understanding of the underlying mechanisms behind these effects is still rudimentary and lacks experimental evidences. In this paper, we shed light to the governing mechanism of fragmentation and de-agglomeration of Al3Zr and MgO particles, respectively in water. Real-time high-speed imaging was performed to discern the dynamic interaction of cavitation with free-floating particles in a controlled ultrasonic environment. In-situ observations revealed that intermetallic breakage primarily occurs due to propagating shock waves, whereas the oxide de-agglomeration happens through microbubble cluster collapses close to the agglomerate. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Other, Other, Other |