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Ultrasound induced fragmentation of primary Al3Zr crystals

Ultrasound induced fragmentation of primary Al3Zr crystals

Priyadarshi, Abhinav, Subroto, Tungky, Conte, Marcello, Prentice, Paul, Pericleous, Koulis ORCID: 0000-0002-7426-9999, Eskin, Dmitry, Durodola, John and Tzanakis, Iakovos (2020) Ultrasound induced fragmentation of primary Al3Zr crystals. In: The 17th International Conference on Aluminium Alloys 2020 (ICAA17). MATEC Web of Conferences, 326 (04002). EDP Sciences, Grenoble, France, pp. 1-7. ISSN 2261-236X (Online) (doi:

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Ultrasonic cavitation melt treatment (UST) of aluminium alloys has received considerable attention in the metal industry due to its simple and effective processing response. The refined primary intermetallic phases formed in the treated alloys during controlled solidification, govern alloy structural and mechanical properties for applications in the automotive and aerospace industries. Since the UST is performed close to the liquidus temperatures of the alloys, understanding the refinement mechanism of the primary intermetallic phases has been beset by difficulties in imaging and handling of liquid metals. In this paper, the sonofragmentation behaviour of primary intermetallic Al3Zr crystals extracted from the matrix of an Al-3 wt% Zr alloy and fixed on a solid substrate was investigated. The intermetallics were exposed to cavitation action in deionized water at 24 kHz of ultrasound frequency. The fragmentation mechanism from the nearby collapsing cavitation bubbles was studied with in-situ high speed imaging. Results revealed that the main fragmentation mechanism is associated with the propagation of shock wave emissions from the collapsing bubble clouds in the vicinity of the crystal. The mechanical properties of the Al3Zr phase determined previously were used for the fracture analysis. It was found that an Al3Zr intermetallic undergoes low cycle fatigue fracture due to the continuous interaction with the shock wave pressure. The magnitude of the resulting shear stress that leads to intermetallic fragmentation was found to be in the range of 0.6 – 1 MPa.

Item Type: Conference Proceedings
Title of Proceedings: The 17th International Conference on Aluminium Alloys 2020 (ICAA17)
Additional Information: © The Authors, published by EDP Sciences, 2020. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords: Ultrasonic melt treatment, intermetallic crystal, high speed imaging, cavitation, fragmentation, deflection
Subjects: Q Science > QA Mathematics
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA)
Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Faculty of Engineering & Science
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Last Modified: 04 Mar 2022 13:06

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