A high-speed imaging and modeling study of dendrite fragmentation caused by ultrasonic cavitation

Shu, Da; Sun, Baode; Mi, Jiawei; Grant, Patrick S.

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.

Citation

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. https://doi.org/10.1007/s11661-012-1188-3

• Journal Article Type: Article
• Online Publication Date: May 16, 2012
• Publication Date: 2012-10
• Journal: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
• Print ISSN: 1073-5623
• Publisher: Springer Publishing Company
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 10
• Pages: 3755-3766
• DOI: https://doi.org/10.1007/s11661-012-1188-3
• Keywords: Mechanics of Materials; Condensed Matter Physics; Metals and Alloys
• Public URL: https://hull-repository.worktribe.com/output/417749