High speed synchrotron X-ray imaging studies of the ultrasound shockwave and enhanced flow during metal solidification processes

Tan, Dongyue; Lee, Tung Lik; Khong, Jia Chuan; Connolley, Thomas; Fezzaa, Kamel; Mi, Jiawei

Abstract

The highly dynamic behaviour of ultrasonic bubble implosion in liquid metal, the multiphase liquid metal flow containing bubbles and particles, and the interaction between ultrasonic waves and semisolid phases during solidification of metal were studied in situ using the complementary ultrafast and high speed synchrotron X-ray imaging facilities housed respectively at the Advanced Photon Source, Argonne National Laboratory, US, and Diamond Light Source, UK. Real-time ultrafast X-ray imaging of 135,780 frames per second (fps) revealed that ultrasonic bubble implosion in a liquid Bi-8 wt. %Zn alloy can occur in a single wave period (30 kHz), and the effective region affected by the shockwave at implosion was 3.5 times the original bubble diameter. Furthermore, ultrasound bubbles in liquid metal move faster than the primary particles, and the velocity of bubbles is 70 ~ 100% higher than that of the primary particles present in the same locations close to the sonotrode. Ultrasound waves can very effectively create a strong swirling flow in a semisolid melt in less than one second. The energetic flow can detach solid particles from the liquid-solid interface and redistribute them back into the bulk liquid very effectively.

Citation

Tan, D., Lee, T. L., Khong, J. C., Connolley, T., Fezzaa, K., & Mi, J. (2015). High speed synchrotron X-ray imaging studies of the ultrasound shockwave and enhanced flow during metal solidification processes. Metallurgical and materials transactions. A, Physical metallurgy and materials science, 46(7), 2851-2861. https://doi.org/10.1007/s11661-015-2872-x

• Journal Article Type: Article
• Acceptance Date: Jan 15, 2015
• Online Publication Date: Mar 31, 2015
• Publication Date: Jul 26, 2015
• Deposit Date: May 7, 2015
• Publicly Available Date: May 7, 2015
• Journal: Metallurgical and materials transactions A
• Print ISSN: 1073-5623
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 7
• Pages: 2851-2861
• DOI: https://doi.org/10.1007/s11661-015-2872-x
• Keywords: Metal solidification processes
• Public URL: https://hull-repository.worktribe.com/output/373585
• Publisher URL: http://link.springer.com/article/10.1007/s11661-015-2872-x
• Additional Information: Author's accepted manuscript of article published in: Metallurgical and materials transactions A, 2015, v.46, issue 7. The final publication is available at Springer via http://dx.doi.org/10.1007/s11661-015-2872-x
• Contract Date: May 7, 2015