A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation
Shu, Da; Sun, Baode; Mi, Jiawei; Grant, Patrick S.
Professor Jiawei Mi J.Mi@hull.ac.uk
Professor of Materials
Patrick S. Grant
The dynamic behavior of ultrasound-induced cavitation bubbles and their effect on the fragmentation of dendritic grains of a solidifying succinonitrile 1 wt pct camphor organic transparent alloy have been studied experimentally using high-speed digital imaging and complementary numerical analysis of sound wave propagation, cavitation dynamics, and the velocity field in the vicinity of an imploding cavitation bubble. Real-time imaging and analysis revealed that the violent implosion of bubbles created local shock waves that could shatter dendrites nearby into small pieces in a few tens of milliseconds. These catastrophic events were effective in breaking up growing dendritic grains and creating abundant fragmented crystals that may act as embryonic grains; therefore, these events play an important role in grain refinement of metallurgical alloys.
Shu, D., Sun, B., Mi, J., & Grant, P. S. (2012). A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation. Metallurgical and materials transactions. A, Physical metallurgy and materials science, 43(10), (3755-3766). doi:10.1007/s11661-012-1188-3. ISSN 1073-5623
|Journal Article Type||Article|
|Online Publication Date||May 16, 2012|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|Publisher||Springer Publishing Company|
|Peer Reviewed||Peer Reviewed|
|Keywords||Mechanics of Materials; Condensed Matter Physics; Metals and Alloys|
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