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High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments

Kirill Yusenko, Sephira Riva, Wilson A. Crichton, Kristina Spektor, Elena Bykova, Anna Pakhomova, Adam Tudball, Ilya Kupenko, Arno Rohrbach, Stephan Klemme, Francesco Mazzali, Serena Margadonna Orcid Logo, Nicholas Lavery Orcid Logo, Steve Brown

Journal of Alloys and Compounds, Volume: 738, Pages: 491 - 500

Swansea University Authors: Kirill Yusenko, Serena Margadonna Orcid Logo, Nicholas Lavery Orcid Logo, Steve Brown

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DOI (Published version): 10.1016/j.jallcom.2017.12.216

Abstract

The exceptional performance of some High Entropy Alloys (HEAs) under extreme conditions holds out the possibility of new and exciting materials for engineers to exploit in future applications. In this work, instead of focusing solely on the effects of high temperature on HEAs, the effects of combine...

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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa37789
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spelling 2020-10-06T13:51:17.6552870 v2 37789 2018-01-02 High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments 5f69729173cc92ee7f08d59ffcef3e81 Kirill Yusenko Kirill Yusenko true false e31904a10b1b1240b98ab52d9977dfbe 0000-0002-6996-6562 Serena Margadonna Serena Margadonna true false 9f102ff59824fd4f7ce3d40144304395 0000-0003-0953-5936 Nicholas Lavery Nicholas Lavery true false 07a865adc76376646bc6c03a69ce35a9 Steve Brown Steve Brown true false 2018-01-02 EEN The exceptional performance of some High Entropy Alloys (HEAs) under extreme conditions holds out the possibility of new and exciting materials for engineers to exploit in future applications. In this work, instead of focusing solely on the effects of high temperature on HEAs, the effects of combined high temperature and high pressure were observed. Phase transformations occurring in a pristine HEA, the as-cast bcc–Al2CoCrFeNi, are heavily influenced by temperature, pressure, and by scandium additions. As-cast bcc–Al2CoCrFeNi and fcc–Al0.3CoCrFeNi HEAs are structurally stable below 60 GPa and do not undergo phase transitions. Addition of scandium to bcc–Al2CoCrFeNi results in the precipitation of hexagonal AlScM intermetallic (W-phase), which dissolves in the matrix after high-pressure high-temperature treatment. Addition of scandium and high-pressure sintering improve hardness and thermal stability of well-investigated fcc- and bcc- HEAs. The dissolution of the intermetallic in the main phase at high pressure suggests a new strategy in the design and optimization of HEAs. Journal Article Journal of Alloys and Compounds 738 491 500 0925-8388 High-entropy alloys; Scandium; High-pressure high-temperature sintering; Spark plasma sintering; In situ X-ray diffraction 25 3 2018 2018-03-25 10.1016/j.jallcom.2017.12.216 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-10-06T13:51:17.6552870 2018-01-02T14:39:28.4659513 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Kirill Yusenko 1 Sephira Riva 2 Wilson A. Crichton 3 Kristina Spektor 4 Elena Bykova 5 Anna Pakhomova 6 Adam Tudball 7 Ilya Kupenko 8 Arno Rohrbach 9 Stephan Klemme 10 Francesco Mazzali 11 Serena Margadonna 0000-0002-6996-6562 12 Nicholas Lavery 0000-0003-0953-5936 13 Steve Brown 14 0037789-02012018144208.pdf yusenko2017v2.pdf 2018-01-02T14:42:08.4170000 Output 5251795 application/pdf Accepted Manuscript true 2018-12-20T00:00:00.0000000 true eng
title High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
spellingShingle High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
Kirill Yusenko
Serena Margadonna
Nicholas Lavery
Steve Brown
title_short High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
title_full High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
title_fullStr High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
title_full_unstemmed High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
title_sort High-pressure high-temperature tailoring of High Entropy Alloys for extreme environments
author_id_str_mv 5f69729173cc92ee7f08d59ffcef3e81
e31904a10b1b1240b98ab52d9977dfbe
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07a865adc76376646bc6c03a69ce35a9
author_id_fullname_str_mv 5f69729173cc92ee7f08d59ffcef3e81_***_Kirill Yusenko
e31904a10b1b1240b98ab52d9977dfbe_***_Serena Margadonna
9f102ff59824fd4f7ce3d40144304395_***_Nicholas Lavery
07a865adc76376646bc6c03a69ce35a9_***_Steve Brown
author Kirill Yusenko
Serena Margadonna
Nicholas Lavery
Steve Brown
author2 Kirill Yusenko
Sephira Riva
Wilson A. Crichton
Kristina Spektor
Elena Bykova
Anna Pakhomova
Adam Tudball
Ilya Kupenko
Arno Rohrbach
Stephan Klemme
Francesco Mazzali
Serena Margadonna
Nicholas Lavery
Steve Brown
format Journal article
container_title Journal of Alloys and Compounds
container_volume 738
container_start_page 491
publishDate 2018
institution Swansea University
issn 0925-8388
doi_str_mv 10.1016/j.jallcom.2017.12.216
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 The exceptional performance of some High Entropy Alloys (HEAs) under extreme conditions holds out the possibility of new and exciting materials for engineers to exploit in future applications. In this work, instead of focusing solely on the effects of high temperature on HEAs, the effects of combined high temperature and high pressure were observed. Phase transformations occurring in a pristine HEA, the as-cast bcc–Al2CoCrFeNi, are heavily influenced by temperature, pressure, and by scandium additions. As-cast bcc–Al2CoCrFeNi and fcc–Al0.3CoCrFeNi HEAs are structurally stable below 60 GPa and do not undergo phase transitions. Addition of scandium to bcc–Al2CoCrFeNi results in the precipitation of hexagonal AlScM intermetallic (W-phase), which dissolves in the matrix after high-pressure high-temperature treatment. Addition of scandium and high-pressure sintering improve hardness and thermal stability of well-investigated fcc- and bcc- HEAs. The dissolution of the intermetallic in the main phase at high pressure suggests a new strategy in the design and optimization of HEAs.
published_date 2018-03-25T03:47:39Z
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score 11.037581

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