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Solidification of Aluminium Alloys Under Ultrasonication: An Overview

H. R. Kotadia, M. Qian, A. Das, Amit Das Orcid Logo

Transactions of the Indian Institute of Metals, Volume: 71, Issue: 11, Pages: 2681 - 2686

Swansea University Author: Amit Das Orcid Logo

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DOI (Published version): 10.1007/s12666-018-1446-1

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 ultra...

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Published in: Transactions of the Indian Institute of Metals
ISSN: 0972-2815 0975-1645
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa44754
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first_indexed 2018-10-03T19:05:23Z
last_indexed 2018-11-26T14:20:20Z
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spelling 2018-11-26T11:10:04.1342858 v2 44754 2018-10-03 Solidification of Aluminium Alloys Under Ultrasonication: An Overview 4d785df766daed9a857c934bb130ed8b 0000-0002-7196-6254 Amit Das Amit Das true false 2018-10-03 MTLS 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 Al–33 wt%Cu was observed to degenerate into rounded particle morphology and the irregular eutectic of long Si plates in Al–11 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. Journal Article Transactions of the Indian Institute of Metals 71 11 2681 2686 0972-2815 0975-1645 Ultrasound, Cavitation, Solidification, Grain refinement, Microstructure, Al alloys 31 12 2018 2018-12-31 10.1007/s12666-018-1446-1 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2018-11-26T11:10:04.1342858 2018-10-03T17:28:35.4138265 H. R. Kotadia 1 M. Qian 2 A. Das 3 Amit Das 0000-0002-7196-6254 4 0044754-08102018141030.pdf kotadia2018.pdf 2018-10-08T14:10:30.1300000 Output 1287574 application/pdf Version of Record true 2018-10-08T00:00:00.0000000 true eng
title Solidification of Aluminium Alloys Under Ultrasonication: An Overview
spellingShingle Solidification of Aluminium Alloys Under Ultrasonication: An Overview
Amit Das
title_short Solidification of Aluminium Alloys Under Ultrasonication: An Overview
title_full Solidification of Aluminium Alloys Under Ultrasonication: An Overview
title_fullStr Solidification of Aluminium Alloys Under Ultrasonication: An Overview
title_full_unstemmed Solidification of Aluminium Alloys Under Ultrasonication: An Overview
title_sort Solidification of Aluminium Alloys Under Ultrasonication: An Overview
author_id_str_mv 4d785df766daed9a857c934bb130ed8b
author_id_fullname_str_mv 4d785df766daed9a857c934bb130ed8b_***_Amit Das
author Amit Das
author2 H. R. Kotadia
M. Qian
A. Das
Amit Das
format Journal article
container_title Transactions of the Indian Institute of Metals
container_volume 71
container_issue 11
container_start_page 2681
publishDate 2018
institution Swansea University
issn 0972-2815
0975-1645
doi_str_mv 10.1007/s12666-018-1446-1
document_store_str 1
active_str 0
description 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 Al–33 wt%Cu was observed to degenerate into rounded particle morphology and the irregular eutectic of long Si plates in Al–11 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.
published_date 2018-12-31T03:56:08Z
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score 11.035655

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