|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||CFD Modeling and Simulation in Materials Processing
||Modeling the De-agglomeration and Dispersion of Particles in Metallic Alloy Melts during Ultrasonic Treatment
||Koulis Pericleous, Georgi Djambazov, Bruno Lebon, Anton Manoylov
|On-Site Speaker (Planned)
Ultrasonic treatment of metallic alloy melts during solidification is known to refine microstructure, aid degassing and disperse particles in metal matrix composites (MMCs), effects attributed to cavitation of dissolved gases. We present here a multi-scale and multi-physics scheme that determines the soundfield leading to cavitation in a crucible, predicts the instantaneous pressure field caused by collapsing bubbles and uses this information to study the behavior of immersed particles. MMCs have the potential to improve the mechanical properties of alloys, but only if the strengthening micron/nano size particles are well dispersed in the matrix. This is not easy to achieve; sub-micron particles have very large surface energy, which leads to clustering and large clusters can act as crack initiation defects to be avoided. A CFD/DEM scheme connects cavitation activity in a flowfield with cluster behavior to predict their breakup. Both traditional immersed sonotrode and contactless electromagnetic UST techniques are examined.
||Planned: None Selected