Effect of ultrasonication on the solidification microstructure in al and mg-alloys

Zhang, X, Kotadia, H, Depner, J, Ma, Q and Das, A 2019, 'Effect of ultrasonication on the solidification microstructure in al and mg-alloys', in Corleen Chesonis (ed.) Proceedings of the 148th Annual Meeting and Exhibition: Minerals, Metals and Materials Series, Light Metals Symposium 2019, San Antonio, United States, 10-14 March 2019, pp. 1589-1595.


Document type: Conference Paper
Collection: Conference Papers

Title Effect of ultrasonication on the solidification microstructure in al and mg-alloys
Author(s) Zhang, X
Kotadia, H
Depner, J
Ma, Q
Das, A
Year 2019
Conference name Light Metals 2019 Part XXXIII: Ultrasonic Processing of Liquid and Solidifying Alloys: Mechanisms and Applications of Ultrasonic Processing
Conference location San Antonio, United States
Conference dates 10-14 March 2019
Proceedings title Proceedings of the 148th Annual Meeting and Exhibition: Minerals, Metals and Materials Series, Light Metals Symposium 2019
Editor(s) Corleen Chesonis
Publisher Springer
Place of publication Switzerland
Start page 1589
End page 1595
Total pages 7
Abstract Solidification microstructures formed under high-intensity ultrasonication are systematically investigated in various Al and Mg-alloys. The range of microstructures examined include primary grain structure, intermetallic compounds (IMCs), regular and irregular eutectics. Extensive grain refinement is observed in all alloys, especially in the areas of cavitation, further facilitated by the presence of solute. Heat treatability of the ultrasonicated alloys is enhanced as the fine-grained microstructure reduced diffusion distance. Regular lamellar eutectic microstructure is observed to degenerate under cavitation. Irregular eutectic and IMCs are modified from coarse plates or complex morphology into compact polygonal shape. Result suggests that ultrasonication increases nucleating particles and potency of nucleants. The modification of eutectic and IMCs predominantly occurs through coarsening and spheroidisation in the area of intense cavitation. While grain refinement effect is noticed in the entire ingots assisted by acoustic streaming, eutectic modification effect dissipates rapidly outside the area of cavitation.
Subjects Metals and Alloy Materials
Keyword(s) Artificial aging
Cavitation
Eutectic
Grain refinement
Light alloys
Ultrasound
DOI - identifier 10.1007/978-3-030-05864-7_201
Copyright notice © The Minerals, Metals & Materials Society 2019
ISBN 9783030058630
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