Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi

González, S.; Sfikas, A.K.; Kamnis, Spyros; John, Sean; Nye, Zachariah; Spink, M.; Allen, C.; Martínez-Sánchez, R.; Naung, S.W.; Rahmati, M.; Keil, T.; Durst, K.; Lancaster, Robert

doi:10.1016/j.jallcom.2022.168219

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Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi

S. González, A.K. Sfikas, Spyros Kamnis, Sean John, Zachariah Nye, M. Spink, C. Allen, R. Martínez-Sánchez, S.W. Naung, M. Rahmati, T. Keil, K. Durst, Robert Lancaster

Journal of Alloys and Compounds, Volume: 936, Start page: 168219

Swansea University Authors: Sean John, Zachariah Nye, Robert Lancaster

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DOI (Published version): 10.1016/j.jallcom.2022.168219

Abstract

The suitability of determining the strain rate sensitivity (SRS) of the CoCrFeMnNi high-entropy alloy (HEA) by small punch (SP) testing has been assessed at displacement rates ranging from 0.2 to 2 mm∙min-1. The stress was found to increase as the displacement rate was raised from 0.2 to 2 mm∙min-1,...

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Published in:	Journal of Alloys and Compounds
ISSN:	0925-8388
Published:	Elsevier BV 2023
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URI:	https://cronfa.swan.ac.uk/Record/cronfa62090
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The stress was found to increase as the displacement rate was raised from 0.2 to 2 mm∙min-1, whereas the plastic strain distributions were similar in all cases. However, for a higher displacement rate of 10 mm∙min-1, the sample was found to exhibit a drop in strength and ductility attributed to casting defects. The strain-rate sensitivity exponent (m) was found to be 0.1387 whilst the Finite Element Analysis (FEA) simulations predicted a slightly smaller value of 0.1313. This latter value is closer to m = 0.091 obtained from nanoindentation strain rate jump tests since the results are insensitive to the presence of small casting defects. The relationship between the experimental and the empirically derived predicted properties from the SP tests revealed a high level of agreement for maximum stress properties. The properties predicted at 2 mm∙min-1 (R2 = 0.96) offered a stronger fit than at 0.5 mm∙min-1 (R2 = 0.92).</abstract><type>Journal Article</type><journal>Journal of Alloys and Compounds</journal><volume>936</volume><journalNumber/><paginationStart>168219</paginationStart><paginationEnd/><publisher>Elsevier BV</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0925-8388</issnPrint><issnElectronic/><keywords>High entropy alloy, Small punch testing, Finite element simulation</keywords><publishedDay>5</publishedDay><publishedMonth>3</publishedMonth><publishedYear>2023</publishedYear><publishedDate>2023-03-05</publishedDate><doi>10.1016/j.jallcom.2022.168219</doi><url/><notes/><college>COLLEGE NANME</college><department>Materials Science and Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>MTLS</DepartmentCode><institution>Swansea University</institution><apcterm/><funders>The authors would like to acknowledge the support from the UK Research & Innovation (UKRI-IUK) national funding agency. Project Grant: 53662 ‘Design of High-Entropy Superalloys Using a Hybrid Experimental-Based Machine Learning Approach: Steel Sector Application’. The authors would also like to thank Diamond Light Source for access and support in use of the electron Physical Science Imaging Centre (Instrument E01 or/and E02 and proposal number MG28409) that contributed to the results presented here. 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spelling	2022-12-07T10:46:37.9230523 v2 62090 2022-11-30 Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi 8332e0e483d7926c508d9309553e3497 Sean John Sean John true false ef996ae7fffe1dfc162d5b44e24123a3 Zachariah Nye Zachariah Nye true false e1a1b126acd3e4ff734691ec34967f29 0000-0002-1365-6944 Robert Lancaster Robert Lancaster true false 2022-11-30 MTLS The suitability of determining the strain rate sensitivity (SRS) of the CoCrFeMnNi high-entropy alloy (HEA) by small punch (SP) testing has been assessed at displacement rates ranging from 0.2 to 2 mm∙min-1. The stress was found to increase as the displacement rate was raised from 0.2 to 2 mm∙min-1, whereas the plastic strain distributions were similar in all cases. However, for a higher displacement rate of 10 mm∙min-1, the sample was found to exhibit a drop in strength and ductility attributed to casting defects. The strain-rate sensitivity exponent (m) was found to be 0.1387 whilst the Finite Element Analysis (FEA) simulations predicted a slightly smaller value of 0.1313. This latter value is closer to m = 0.091 obtained from nanoindentation strain rate jump tests since the results are insensitive to the presence of small casting defects. The relationship between the experimental and the empirically derived predicted properties from the SP tests revealed a high level of agreement for maximum stress properties. The properties predicted at 2 mm∙min-1 (R2 = 0.96) offered a stronger fit than at 0.5 mm∙min-1 (R2 = 0.92). Journal Article Journal of Alloys and Compounds 936 168219 Elsevier BV 0925-8388 High entropy alloy, Small punch testing, Finite element simulation 5 3 2023 2023-03-05 10.1016/j.jallcom.2022.168219 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University The authors would like to acknowledge the support from the UK Research & Innovation (UKRI-IUK) national funding agency. Project Grant: 53662 ‘Design of High-Entropy Superalloys Using a Hybrid Experimental-Based Machine Learning Approach: Steel Sector Application’. The authors would also like to thank Diamond Light Source for access and support in use of the electron Physical Science Imaging Centre (Instrument E01 or/and E02 and proposal number MG28409) that contributed to the results presented here. K.D. gratefully acknowledge the funding by the German Research Foundation (DFG) within the priority programme SPP2006 under Grant No. DU424/13–2. 2022-12-07T10:46:37.9230523 2022-11-30T10:38:13.8665426 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering S. González 1 A.K. Sfikas 2 Spyros Kamnis 3 Sean John 4 Zachariah Nye 5 M. Spink 6 C. Allen 7 R. Martínez-Sánchez 8 S.W. Naung 9 M. Rahmati 10 T. Keil 11 K. Durst 12 Robert Lancaster 0000-0002-1365-6944 13 62090__25964__caa728b56f1f443ca42963e4b5b3c4bc.pdf 62090VoR.pdf 2022-12-01T08:46:24.1681049 Output 8874244 application/pdf Version of Record true © 2022 The Authors. This is an open access article under the CC BY license true eng https://creativecommons.org/licenses/by/4.0/
title	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
spellingShingle	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi Sean John Zachariah Nye Robert Lancaster
title_short	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
title_full	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
title_fullStr	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
title_full_unstemmed	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
title_sort	Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi
author_id_str_mv	8332e0e483d7926c508d9309553e3497 ef996ae7fffe1dfc162d5b44e24123a3 e1a1b126acd3e4ff734691ec34967f29
author_id_fullname_str_mv	8332e0e483d7926c508d9309553e3497_*_Sean John ef996ae7fffe1dfc162d5b44e24123a3__Zachariah Nye e1a1b126acd3e4ff734691ec34967f29_**_Robert Lancaster
author	Sean John Zachariah Nye Robert Lancaster
author2	S. González A.K. Sfikas Spyros Kamnis Sean John Zachariah Nye M. Spink C. Allen R. Martínez-Sánchez S.W. Naung M. Rahmati T. Keil K. Durst Robert Lancaster
format	Journal article
container_title	Journal of Alloys and Compounds
container_volume	936
container_start_page	168219
publishDate	2023
institution	Swansea University
issn	0925-8388
doi_str_mv	10.1016/j.jallcom.2022.168219
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
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department_str	School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str	1
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description	The suitability of determining the strain rate sensitivity (SRS) of the CoCrFeMnNi high-entropy alloy (HEA) by small punch (SP) testing has been assessed at displacement rates ranging from 0.2 to 2 mm∙min-1. The stress was found to increase as the displacement rate was raised from 0.2 to 2 mm∙min-1, whereas the plastic strain distributions were similar in all cases. However, for a higher displacement rate of 10 mm∙min-1, the sample was found to exhibit a drop in strength and ductility attributed to casting defects. The strain-rate sensitivity exponent (m) was found to be 0.1387 whilst the Finite Element Analysis (FEA) simulations predicted a slightly smaller value of 0.1313. This latter value is closer to m = 0.091 obtained from nanoindentation strain rate jump tests since the results are insensitive to the presence of small casting defects. The relationship between the experimental and the empirically derived predicted properties from the SP tests revealed a high level of agreement for maximum stress properties. The properties predicted at 2 mm∙min-1 (R2 = 0.96) offered a stronger fit than at 0.5 mm∙min-1 (R2 = 0.92).
published_date	2023-03-05T04:21:26Z
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Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi

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