A High-Speed Imaging and Modeling Study of Dendrite Fragmentation Caused by Ultrasonic Cavitation
By D. Shu, Bao-de Sun, Jiawei Mi, Patrick S. Grant. Metallurgical and Materials Transactions. A, 2012
148 citations recorded by the source corpus.
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.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/9cfc7c50a4a48bb38c448dbb8013a64cd4470423
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In Materials Chemistry
Citations in the corpus
- Progress in modelling solidification microstructures in metals and alloys. Part II: dendrites from 2001 to 2018 (2020, background): “Also an electric current creating fl ow by the Lorentz force [198] or ultrasonic pulses [199] can fragment dendrites.”
- Advanced Metal Matrix Nanocomposites (2019, background): “In addition, in situ observation requires imaging with nanoscale resolution and extremely high speed (up to on the order of 105 frames per second [119]) to be able to capture both activities of nanoparticle clusters and cavitation bubbles (with radii from a few to a few hundreds of micrometers [114,”
- Ultrafast synchrotron X-ray imaging studies of microstructure fragmentation in solidification under ultrasound (2018, methodology): “transparent alloys [8,11,23], to mimic liquid metal alloys in order to study the effects of ultrasonic bubbles and streaming flow during solidification under visible light illumination.”
- A synchrotron X-radiography study of the fragmentation and refinement of primary intermetallic particles in an Al-35Cu alloy induced by ultrasonic melt processing (2017, unknown): “The acoustic streaming flow was considered to have less effect on fragmentation, instead only transferring the fragments throughout the melt [18,38].”