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- Title
A High-Speed Imaging and Modeling Study of Dendrite Fragmentation Caused by Ultrasonic Cavitation.
- Authors
Shu, Da; Sun, Baode; Mi, Jiawei; Grant, Patrick
- Abstract
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.
- Subjects
CAVITATION; HYDRODYNAMICS; DENDRITIC crystals; SUCCINONITRILE; SOUND waves; SHOCK waves
- Publication
Metallurgical & Materials Transactions. Part A, 2012, Vol 43, Issue 10, p3755
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-012-1188-3