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The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys

Sephira Riva, Shahin Mehraban, Nicholas Lavery Orcid Logo, Stefan Schwarzmüller, Oliver Oeckler, Stephen Brown, Kirill Yusenko, Steve Brown

Entropy, Volume: 20, Issue: 7, Start page: 488

Swansea University Authors: Nicholas Lavery Orcid Logo, Steve Brown

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DOI (Published version): 10.3390/e20070488

Abstract

We investigate the effect of alloying with scandium on microstructure, high-temperature phase stability, electron transport, and mechanical properties of the Al2CoCrFeNi, Al0.5CoCrCuFeNi, and AlCoCrCu0.5FeNi high-entropy alloys. Out of the three model alloys, Al2CoCrFeNi adopts a disordered CsCl str...

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Published in: Entropy
ISSN: 1099-4300
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa40823
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spelling 2018-09-17T14:00:26.8071511 v2 40823 2018-06-27 The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys 9f102ff59824fd4f7ce3d40144304395 0000-0003-0953-5936 Nicholas Lavery Nicholas Lavery true false 07a865adc76376646bc6c03a69ce35a9 Steve Brown Steve Brown true false 2018-06-27 MECH We investigate the effect of alloying with scandium on microstructure, high-temperature phase stability, electron transport, and mechanical properties of the Al2CoCrFeNi, Al0.5CoCrCuFeNi, and AlCoCrCu0.5FeNi high-entropy alloys. Out of the three model alloys, Al2CoCrFeNi adopts a disordered CsCl structure type. Both of the six-component alloys contain a mixture of body-centered cubic (bcc) and face centered cubic (fcc) phases. The comparison between in situ high-temperature powder diffraction data and ex situ data from heat-treated samples highlights the presence of a reversible bcc to fcc transition. The precipitation of a MgZn2-type intermetallic phase along grain boundaries following scandium addition affects all systems differently, but especially enhances the properties of Al2CoCrFeNi. It causes grain refinement; hardness and electrical conductivity increases (up to 20% and 14% respectively) and affects the CsCl-type → fcc equilibrium by moving the transformation to sensibly higher temperatures. The maximum dimensionless thermoelectric figure of merit (ZT) of 0.014 is reached for Al2CoCrFeNi alloyed with 0.3 wt.% Sc at 650 °C. Journal Article Entropy 20 7 488 1099-4300 high-entropy alloys; in situ X-ray diffraction; grain refinement; thermoelectric properties; scandium effect 22 6 2018 2018-06-22 10.3390/e20070488 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2018-09-17T14:00:26.8071511 2018-06-27T08:26:57.0367127 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sephira Riva 1 Shahin Mehraban 2 Nicholas Lavery 0000-0003-0953-5936 3 Stefan Schwarzmüller 4 Oliver Oeckler 5 Stephen Brown 6 Kirill Yusenko 7 Steve Brown 8 0040823-13072018103852.pdf riva2018.pdf 2018-07-13T10:38:52.3930000 Output 6784551 application/pdf Version of Record true 2018-07-13T00:00:00.0000000 true eng
title The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
spellingShingle The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
Nicholas Lavery
Steve Brown
title_short The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
title_full The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
title_fullStr The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
title_full_unstemmed The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
title_sort The Effect of Scandium Ternary Intergrain Precipitates in Al-Containing High-Entropy Alloys
author_id_str_mv 9f102ff59824fd4f7ce3d40144304395
07a865adc76376646bc6c03a69ce35a9
author_id_fullname_str_mv 9f102ff59824fd4f7ce3d40144304395_***_Nicholas Lavery
07a865adc76376646bc6c03a69ce35a9_***_Steve Brown
author Nicholas Lavery
Steve Brown
author2 Sephira Riva
Shahin Mehraban
Nicholas Lavery
Stefan Schwarzmüller
Oliver Oeckler
Stephen Brown
Kirill Yusenko
Steve Brown
format Journal article
container_title Entropy
container_volume 20
container_issue 7
container_start_page 488
publishDate 2018
institution Swansea University
issn 1099-4300
doi_str_mv 10.3390/e20070488
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description We investigate the effect of alloying with scandium on microstructure, high-temperature phase stability, electron transport, and mechanical properties of the Al2CoCrFeNi, Al0.5CoCrCuFeNi, and AlCoCrCu0.5FeNi high-entropy alloys. Out of the three model alloys, Al2CoCrFeNi adopts a disordered CsCl structure type. Both of the six-component alloys contain a mixture of body-centered cubic (bcc) and face centered cubic (fcc) phases. The comparison between in situ high-temperature powder diffraction data and ex situ data from heat-treated samples highlights the presence of a reversible bcc to fcc transition. The precipitation of a MgZn2-type intermetallic phase along grain boundaries following scandium addition affects all systems differently, but especially enhances the properties of Al2CoCrFeNi. It causes grain refinement; hardness and electrical conductivity increases (up to 20% and 14% respectively) and affects the CsCl-type → fcc equilibrium by moving the transformation to sensibly higher temperatures. The maximum dimensionless thermoelectric figure of merit (ZT) of 0.014 is reached for Al2CoCrFeNi alloyed with 0.3 wt.% Sc at 650 °C.
published_date 2018-06-22T03:51:59Z
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score 11.037581

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