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Solidification of Aluminium Alloys Under Ultrasonication: An Overview
Transactions of the Indian Institute of Metals, Volume: 71, Issue: 11, Pages: 2681 - 2686
Swansea University Author:
Amit Das
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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...
Published in: | Transactions of the Indian Institute of Metals |
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ISSN: | 0972-2815 0975-1645 |
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2018
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URI: | https://cronfa.swan.ac.uk/Record/cronfa44754 |
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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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1763752823732830208 |
score |
11.021648 |