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Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study
J. Cieslak,
J. Tobola,
J. Przewoznik,
K. Berent,
U. Dahlborg,
J. Cornide,
S. Mehraban,
N. Lavery,
M. Calvo-Dahlborg,
Nicholas Lavery
Journal of Alloys and Compounds
Swansea University Author:
Nicholas Lavery
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DOI (Published version): 10.1016/j.jallcom.2019.06.121
Abstract
High entropy CrxAlFeCoNi alloys with x = 0, 0.5, 1.0 and 1.5 were synthesized using arc-melting and sintering preparation techniques. Three crystal structures (fcc, bcc and σ) were observed using XRD technique, while EDX measurements showed the presence of up to three chemically different phases (Fe...
Published in: | Journal of Alloys and Compounds |
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ISSN: | 0925-8388 |
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2019
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URI: | https://cronfa.swan.ac.uk/Record/cronfa50812 |
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2019-06-13T10:32:13.4378340 v2 50812 2019-06-13 Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study 9f102ff59824fd4f7ce3d40144304395 0000-0003-0953-5936 Nicholas Lavery Nicholas Lavery true false 2019-06-13 MECH High entropy CrxAlFeCoNi alloys with x = 0, 0.5, 1.0 and 1.5 were synthesized using arc-melting and sintering preparation techniques. Three crystal structures (fcc, bcc and σ) were observed using XRD technique, while EDX measurements showed the presence of up to three chemically different phases (FeCr-rich phase with fcc structure, AlNi-rich phase with bcc structure and Cr-rich phase with bcc and/or σ structures). The reasons for the observed phase coexistence were addressed to total energy electronic structure calculations using KKR-CPA method accounting for chemical disorder effects. Such theoretical analysis confirmed that the multi-phase system was energetically more favorable than the single-phase one. Furthermore, DSC measurements allowed to identify two phase transitions in melted samples, unlike sintered ones due to high-temperature nitrogen corrosion. This process turned out to be highly selective, resulting in the formation of the scales consisting of AlnNm–phases at the cost of total Al loss in the HEA alloy. Journal Article Journal of Alloys and Compounds 0925-8388 High entropy alloys, XRD, EDX, Phase preference, Electronic structure calculations 31 12 2019 2019-12-31 10.1016/j.jallcom.2019.06.121 COLLEGE NANME Mechanical Engineering COLLEGE CODE MECH Swansea University 2019-06-13T10:32:13.4378340 2019-06-13T10:28:12.1891605 J. Cieslak 1 J. Tobola 2 J. Przewoznik 3 K. Berent 4 U. Dahlborg 5 J. Cornide 6 S. Mehraban 7 N. Lavery 8 M. Calvo-Dahlborg 9 Nicholas Lavery 0000-0003-0953-5936 10 0050812-13062019103129.pdf cieslak2019.pdf 2019-06-13T10:31:29.6800000 Output 8122684 application/pdf Accepted Manuscript true 2020-06-11T00:00:00.0000000 false eng |
title |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
spellingShingle |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study Nicholas Lavery |
title_short |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
title_full |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
title_fullStr |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
title_full_unstemmed |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
title_sort |
Multi-phase nature of sintered vs. arc-melted CrxAlFeCoNi high entropy alloys - experimental and theoretical study |
author_id_str_mv |
9f102ff59824fd4f7ce3d40144304395 |
author_id_fullname_str_mv |
9f102ff59824fd4f7ce3d40144304395_***_Nicholas Lavery |
author |
Nicholas Lavery |
author2 |
J. Cieslak J. Tobola J. Przewoznik K. Berent U. Dahlborg J. Cornide S. Mehraban N. Lavery M. Calvo-Dahlborg Nicholas Lavery |
format |
Journal article |
container_title |
Journal of Alloys and Compounds |
publishDate |
2019 |
institution |
Swansea University |
issn |
0925-8388 |
doi_str_mv |
10.1016/j.jallcom.2019.06.121 |
document_store_str |
1 |
active_str |
0 |
description |
High entropy CrxAlFeCoNi alloys with x = 0, 0.5, 1.0 and 1.5 were synthesized using arc-melting and sintering preparation techniques. Three crystal structures (fcc, bcc and σ) were observed using XRD technique, while EDX measurements showed the presence of up to three chemically different phases (FeCr-rich phase with fcc structure, AlNi-rich phase with bcc structure and Cr-rich phase with bcc and/or σ structures). The reasons for the observed phase coexistence were addressed to total energy electronic structure calculations using KKR-CPA method accounting for chemical disorder effects. Such theoretical analysis confirmed that the multi-phase system was energetically more favorable than the single-phase one. Furthermore, DSC measurements allowed to identify two phase transitions in melted samples, unlike sintered ones due to high-temperature nitrogen corrosion. This process turned out to be highly selective, resulting in the formation of the scales consisting of AlnNm–phases at the cost of total Al loss in the HEA alloy. |
published_date |
2019-12-31T04:02:26Z |
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1763753220413325312 |
score |
11.021648 |