Formation and Disruption of W-Phase in High-Entropy Alloys

Riva, Sephira; Fung, Chung; Searle, Justin; Clark, Ronald; Lavery, Nicholas; Brown, Stephen; Yusenko, Kirill; Brown, Steve

doi:10.3390/met6050106

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Formation and Disruption of W-Phase in High-Entropy Alloys

Sephira Riva, Chung Fung, Justin Searle, Ronald Clark, Nicholas Lavery

, Stephen Brown, Kirill Yusenko, Steve Brown

Metals, Volume: 6, Issue: 5, Start page: 106

Swansea University Authors: Nicholas Lavery , Kirill Yusenko, Steve Brown

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DOI (Published version): 10.3390/met6050106

Abstract

High-entropy alloys (HEAs) are single-phase systems prepared from equimolar or near-equimolar concentrations of at least five principal elements. The combination of high mixing entropy, severe lattice distortion, sluggish diffusion and cocktail effect favours the formation of simple phases—usually a...

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Published in:	Metals
ISSN:	2075-4701
Published:	2016
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URI:	https://cronfa.swan.ac.uk/Record/cronfa27735
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The combination of high mixing entropy, severe lattice distortion, sluggish diffusion and cocktail effect favours the formation of simple phases—usually a bcc or fcc matrix with minor inclusions of ordered binary intermetallics. HEAs have been proposed for applications in which high temperature stability (including mechanical and chemical stability under high temperature and high mechanical impact) is required. On the other hand, the major challenge to overcome for HEAs to become commercially attractive is the achievement of lightweight alloys of extreme hardness and low brittleness. The multicomponent AlCrCuScTi alloy was prepared and characterized using powder X-ray diffraction (PXRD), scanning-electron microscope (SEM) and atomic-force microscope equipped with scanning Kelvin probe (AFM/SKP) techniques. Results show that the formation of complex multicomponent ternary intermetallic compounds upon heating plays a key role in phase evolution. The formation and degradation of W-phase, Al2Cu3Sc, in the AlCrCuScTi alloy plays a crucial role in its properties and stability. Analysis of as-melted and annealed alloy suggests that the W-phase is favoured kinetically, but thermodynamically unstable. The disruption of the W-phase in the alloy matrix has a positive effect on hardness (890 HV), density (4.83 g·cm−3) and crack propagation. 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spelling	2020-06-25T16:53:21.6077949 v2 27735 2016-05-06 Formation and Disruption of W-Phase in High-Entropy Alloys 9f102ff59824fd4f7ce3d40144304395 0000-0003-0953-5936 Nicholas Lavery Nicholas Lavery true false 5f69729173cc92ee7f08d59ffcef3e81 Kirill Yusenko Kirill Yusenko true false 07a865adc76376646bc6c03a69ce35a9 Steve Brown Steve Brown true false 2016-05-06 MECH High-entropy alloys (HEAs) are single-phase systems prepared from equimolar or near-equimolar concentrations of at least five principal elements. The combination of high mixing entropy, severe lattice distortion, sluggish diffusion and cocktail effect favours the formation of simple phases—usually a bcc or fcc matrix with minor inclusions of ordered binary intermetallics. HEAs have been proposed for applications in which high temperature stability (including mechanical and chemical stability under high temperature and high mechanical impact) is required. On the other hand, the major challenge to overcome for HEAs to become commercially attractive is the achievement of lightweight alloys of extreme hardness and low brittleness. The multicomponent AlCrCuScTi alloy was prepared and characterized using powder X-ray diffraction (PXRD), scanning-electron microscope (SEM) and atomic-force microscope equipped with scanning Kelvin probe (AFM/SKP) techniques. Results show that the formation of complex multicomponent ternary intermetallic compounds upon heating plays a key role in phase evolution. The formation and degradation of W-phase, Al2Cu3Sc, in the AlCrCuScTi alloy plays a crucial role in its properties and stability. Analysis of as-melted and annealed alloy suggests that the W-phase is favoured kinetically, but thermodynamically unstable. The disruption of the W-phase in the alloy matrix has a positive effect on hardness (890 HV), density (4.83 g·cm−3) and crack propagation. The hardness/density ratio obtained for this alloy shows a record value in comparison with ordinary heavy refractory HEAs. Journal Article Metals 6 5 106 2075-4701 metals and alloys; phase transformations; high-entropy alloys; scandium; W-phase; Al2Cu3Sc 6 5 2016 2016-05-06 10.3390/met6050106 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2020-06-25T16:53:21.6077949 2016-05-06T13:08:23.1689748 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sephira Riva 1 Chung Fung 2 Justin Searle 3 Ronald Clark 4 Nicholas Lavery 0000-0003-0953-5936 5 Stephen Brown 6 Kirill Yusenko 7 Steve Brown 8 0027735-630201642205PM.pdf metals-06-00106.pdf 2016-06-30T16:22:05.8630000 Output 7222641 application/pdf Version of Record true 2016-06-30T00:00:00.0000000 © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license true http://creativecommons.org/licenses/by/4.0/
title	Formation and Disruption of W-Phase in High-Entropy Alloys
spellingShingle	Formation and Disruption of W-Phase in High-Entropy Alloys Nicholas Lavery Kirill Yusenko Steve Brown
title_short	Formation and Disruption of W-Phase in High-Entropy Alloys
title_full	Formation and Disruption of W-Phase in High-Entropy Alloys
title_fullStr	Formation and Disruption of W-Phase in High-Entropy Alloys
title_full_unstemmed	Formation and Disruption of W-Phase in High-Entropy Alloys
title_sort	Formation and Disruption of W-Phase in High-Entropy Alloys
author_id_str_mv	9f102ff59824fd4f7ce3d40144304395 5f69729173cc92ee7f08d59ffcef3e81 07a865adc76376646bc6c03a69ce35a9
author_id_fullname_str_mv	9f102ff59824fd4f7ce3d40144304395_*_Nicholas Lavery 5f69729173cc92ee7f08d59ffcef3e81__Kirill Yusenko 07a865adc76376646bc6c03a69ce35a9_**_Steve Brown
author	Nicholas Lavery Kirill Yusenko Steve Brown
author2	Sephira Riva Chung Fung Justin Searle Ronald Clark Nicholas Lavery Stephen Brown Kirill Yusenko Steve Brown
format	Journal article
container_title	Metals
container_volume	6
container_issue	5
container_start_page	106
publishDate	2016
institution	Swansea University
issn	2075-4701
doi_str_mv	10.3390/met6050106
college_str	Faculty of Science and Engineering
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description	High-entropy alloys (HEAs) are single-phase systems prepared from equimolar or near-equimolar concentrations of at least five principal elements. The combination of high mixing entropy, severe lattice distortion, sluggish diffusion and cocktail effect favours the formation of simple phases—usually a bcc or fcc matrix with minor inclusions of ordered binary intermetallics. HEAs have been proposed for applications in which high temperature stability (including mechanical and chemical stability under high temperature and high mechanical impact) is required. On the other hand, the major challenge to overcome for HEAs to become commercially attractive is the achievement of lightweight alloys of extreme hardness and low brittleness. The multicomponent AlCrCuScTi alloy was prepared and characterized using powder X-ray diffraction (PXRD), scanning-electron microscope (SEM) and atomic-force microscope equipped with scanning Kelvin probe (AFM/SKP) techniques. Results show that the formation of complex multicomponent ternary intermetallic compounds upon heating plays a key role in phase evolution. The formation and degradation of W-phase, Al2Cu3Sc, in the AlCrCuScTi alloy plays a crucial role in its properties and stability. Analysis of as-melted and annealed alloy suggests that the W-phase is favoured kinetically, but thermodynamically unstable. The disruption of the W-phase in the alloy matrix has a positive effect on hardness (890 HV), density (4.83 g·cm−3) and crack propagation. The hardness/density ratio obtained for this alloy shows a record value in comparison with ordinary heavy refractory HEAs.
published_date	2016-05-06T03:33:42Z
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score	11.037581

Formation and Disruption of W-Phase in High-Entropy Alloys

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