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Title: Ultrafast synchrotron X-ray imaging studies of microstructure fragmentation in solidification under ultrasound

Journal Article · · Acta Materialia

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Hull (United Kingdom); Brunel Univ. London (United Kingdom)
Sponsoring Organization:
USDOE Office of Science (SC); Engineering and Physical Sciences Research Council (EPSRC); Royal Society (United Kingdom)
Grant/Contract Number:
GUP 23649; GUP 26170; AC02-06CH11357; EP/L019965/1; EP/L019884/1; EP/L019825/1
OSTI ID:
1437763
Alternate ID(s):
OSTI ID: 1437372
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 144 Journal Issue: C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

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Cited By (5)

Grain structure control during metal 3D printing by high-intensity ultrasound journal January 2020
Ultrasonic Processing for Structure Refinement: An Overview of Mechanisms and Application of the Interdependence Theory journal September 2019
Numerical Modelling of the Ultrasonic Treatment of Aluminium Melts: An Overview of Recent Advances journal October 2019
Effect of Compound Fields of Ultrasonic Vibration and Applied Pressure on the 3D Microstructure and Tensile Properties of Recycled Al-Cu-Mn-Fe-Si Alloys journal November 2019
Characterization of Ultrasonic Bubble Clouds in A Liquid Metal by Synchrotron X-ray High Speed Imaging and Statistical Analysis journal December 2019

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