Solidification of Aluminium Alloys Under Ultrasonication: An Overview

Kotadia, H, Ma, Q and Das, A 2018, 'Solidification of Aluminium Alloys Under Ultrasonication: An Overview', Transactions of the Indian Institute of Metals, vol. 71, no. 11, pp. 2681-2686.


Document type: Journal Article
Collection: Journal Articles

Title Solidification of Aluminium Alloys Under Ultrasonication: An Overview
Author(s) Kotadia, H
Ma, Q
Das, A
Year 2018
Journal name Transactions of the Indian Institute of Metals
Volume number 71
Issue number 11
Start page 2681
End page 2686
Total pages 6
Publisher Indian Institute of Metals
Abstract An overview of our investigations on solidification microstructure formation under ultrasonication in various Al alloys and comparison against unrefined or chemically modified microstructures under identical cooling conditions is presented. Primary α-Al grains show significant refinement under ultrasonication, even better than established chemical inoculation, in the small ingots investigated. Increased solute content appears to promote grain refining efficiency under ultrasonication. Regular lamellar eutectic in Al33 wt%Cu was observed to degenerate into rounded particle morphology and the irregular eutectic of long Si plates in Al11 wt%Si were spheroidised into compact form near the ultrasound radiator. Grain refinement under ultrasonication appears to originate from enhanced heterogeneous nucleation under cavitation showing distinct reduction in nucleation undercooling. Eutectic modification, on the other hand, appears to originate from coarsening as the strong fluid flow created under cavitation disturbs the thin diffusion boundary layer ahead of the eutectic growth front.
Subject Metals and Alloy Materials
Keyword(s) Al alloys
Cavitation
Grain refinement
Microstructure
Solidification
Ultrasound
DOI - identifier 10.1007/s12666-018-1446-1
Copyright notice © The Author(s) 2018
ISSN 0972-2815
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