Ultrafast synchrotron X-ray imaging studies of microstructure fragmentation in solidification under ultrasound
By Bing Wang, Dongyue Tan, Tung Lik Lee, J. C. Khong, Feng Wang, D. Eskin, T. Connolley, K. Fezzaa, Jiawei Mi. 2018
167 citations recorded by the source corpus.
Ultrasound processing of metal alloys is an environmental friendly and promising green technology for liquid metal degassing and microstructural refinement. However many fundamental issues in this field are still not fully understood, because of the difficulties in direct observation of the dynamic behaviours caused by ultrasound inside liquid metal and semisolid metals during the solidification processes. In this paper, we report a systematic study using the ultrafast synchrotron X-ray imaging (up to 271,554 frame per second) technique available at the Advanced Photon Source, USA and Diamond Light Source, UK to investigate the dynamic interactions between the ultrasonic bubbles/acoustic flow and the solidifying phases in a Bi-8%Zn alloy. The experimental results were complimented by numerical modelling. The chaotic bubble implosion and dynamic bubble oscillations were revealed in-situ for the first time in liquid metal and semisolid metal. The fragmentation of the solidifying Zn phases and breaking up of the liquid-solid interface by ultrasonic bubbles and enhanced acoustic flow were clearly demonstrated and agreed very well with the theoretical calculations. The research provides unambiguous experimental evidence and robust theoretical interpretation in elucidating the dominant mechanisms of microstructure fragmentation and refinement in solidification under ultrasound.
Subfields: Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/91913c87844b327565092897eeb346e4581b1a6d
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Citations in the corpus
- Progress in modelling solidification microstructures in metals and alloys. Part II: dendrites from 2001 to 2018 (2020, methodology): “The mechanisms of fragmentation by ultrasonic pulses have also been studied by synchrotron X-ray imaging [188].”
- Non-destructive testing and evaluation of composite materials/structures: A state-of-the-art review (2020, background): “Third-generation light sources originated in the 1990s [221], with facilities that used insertion devices (wigglers and undulators) to produce intense and tuneable X-ray beams.”
- Grain refinement of stainless steel in ultrasound-assisted additive manufacturing (2020, methodology): “[15-17], through inducing fragmentation [13, 18] and/or enhancing nucleation of grains [19, 20].”