|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Real Time Imaging
||Investigation of Echo Source and Signal Deterioration in Ultrasound Measurement of Metal Melt
||Bitong Wang, Andrew Caldwell, Antoine Allanore, Douglas H Kelley
|On-Site Speaker (Planned)
Ultrasound is a powerful tool for measuring flow and detecting impurities in opaque liquids, such as metal melts. Previously, we successfully demonstrated real-time imaging and flow measurement in gallium melt with this technique. However, ultrasound measurement in metal melts is not completely reliable because its operation depends on phenomena that are poorly understood. In this study, we focus on investigating the source of bulk echoes in gallium melt and the corresponding mechanism of ultrasound signal deterioration. Through electron microscopy examinations and ultrasound measurements, we determine that oxide inclusions are the main source of bulk echoes in gallium. By conducting a series of ultrasound measurements under different conditions, we demonstrated that the ultrasound signal deterioration is caused by two distinct factors: the loss of echoing objects and the degradation of wetting at the transducer surface. The possible mechanism of wetting degradation — ultrasound-induced cavitation — is further investigated through simulation and experiments.