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High-Speed Synchrotron X-ray Imaging Studies of the Ultrasound Shockwave and Enhanced Flow during Metal Solidification Processes

DOI: 10.1007/s11661-015-2872-x DOI Help

Authors: Dongyue Tan (University of Hull) , Tung Lik Lee (University of Hull) , Jia Chuan Khong (University of Hull) , Thomas Connolley (Diamond Light Source) , Kamel Fezzaa (Advanced Photon Source) , Jiawei Mi (University of Hull)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Metallurgical And Materials Transactions A , VOL 46 (7) , PAGES 2851-2861

State: Published (Approved)
Published: July 2015
Diamond Proposal Number(s): 8542 , 12131

Abstract: The highly dynamic behavior 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 revealed that ultrasonic bubble implosion in a liquid Bi-8 wt pctZn 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 pct 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.

Subject Areas: Materials, Physics, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: Sector 32-ID-B of the Advanced Photon Source