Effect of Cr content on the mechanical behaviour of a high entropy alloy

Lancaster, Robert; Paolucci, D.; Bevan, C.E.; Abdullah, T.; Ritchie, M.; Olds, A.; Wilkin, L.; Mehraban, S.; Lavery, N.P.; Middleton, N.; Plummer, J.

doi:https://doi.org/

Journal article 84 views

Effect of Cr content on the mechanical behaviour of a high entropy alloy

Robert Lancaster

, D. Paolucci, C.E. Bevan, T. Abdullah, M. Ritchie, A. Olds, L. Wilkin, S. Mehraban, N.P. Lavery, N. Middleton, J. Plummer

Journal of Materials Research and Technology

Swansea University Author: Robert Lancaster

Abstract

High entropy alloys (HEAs) are a relatively novel class of materials with unique properties. Unlike traditional alloys, which are typically based on a single primary metal combined with smaller amounts of other elements, HEAs are composed of five or more principal elements, each usually present in s...

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Published in:	Journal of Materials Research and Technology
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URI:	https://cronfa.swan.ac.uk/Record/cronfa70919

first_indexed	2025-11-17T09:23:52Z
last_indexed	2025-11-18T10:10:43Z
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spelling	2025-11-17T09:23:50.3084048 v2 70919 2025-11-17 Effect of Cr content on the mechanical behaviour of a high entropy alloy e1a1b126acd3e4ff734691ec34967f29 0000-0002-1365-6944 Robert Lancaster Robert Lancaster true false 2025-11-17 EAAS High entropy alloys (HEAs) are a relatively novel class of materials with unique properties. Unlike traditional alloys, which are typically based on a single primary metal combined with smaller amounts of other elements, HEAs are composed of five or more principal elements, each usually present in significant amounts. This study investigates the influence of chromium content on the microstructure and mechanical properties of CrₓCoFeMnNi HEAs focusing on three compositions: HEA10Cr, HEA20Cr, and HEA30Cr. Using Vickers hardness and shear punch testing at both room temperature and 400 °C, the research identifies a strong correlation between increasing Cr content and enhanced strength-based properties. Contrary to conventional behavior, grain size and secondary dendrite arm spacing exhibited limited influence, with mechanical performance instead dominated by chemical composition, lattice distortion, and elemental segregation. The HEA30Cr alloy displayed the highest hardness and shear strength, attributed to more severe lattice distortion, Cr-induced dendritic growth, and sigma phase formation. Elevated temperatures reduced strength and strain hardening due to increased dislocation mobility, though ductility remained largely unaffected. Strain rate sensitivity was found to be modest at room temperature and negligible at 400 °C. These findings underscore the critical role of Cr in tuning the mechanical response of FCC-based HEAs and highlight the need for compositional control to balance strength and ductility for high-performance applications. Journal Article Journal of Materials Research and Technology 0 0 0 0001-01-01 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University FATHOM project (DMEX MAR009). EPSRC (EP/M028267/1),. The European Regional Development Fund through the Welsh Government (80708) and the Ser Solar project via the Welsh Government. 2025-11-17T09:23:50.3084048 2025-11-17T09:17:14.5825052 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Robert Lancaster 0000-0002-1365-6944 1 D. Paolucci 2 C.E. Bevan 3 T. Abdullah 4 M. Ritchie 5 A. Olds 6 L. Wilkin 7 S. Mehraban 8 N.P. Lavery 9 N. Middleton 10 J. Plummer 11
title	Effect of Cr content on the mechanical behaviour of a high entropy alloy
spellingShingle	Effect of Cr content on the mechanical behaviour of a high entropy alloy Robert Lancaster
title_short	Effect of Cr content on the mechanical behaviour of a high entropy alloy
title_full	Effect of Cr content on the mechanical behaviour of a high entropy alloy
title_fullStr	Effect of Cr content on the mechanical behaviour of a high entropy alloy
title_full_unstemmed	Effect of Cr content on the mechanical behaviour of a high entropy alloy
title_sort	Effect of Cr content on the mechanical behaviour of a high entropy alloy
author_id_str_mv	e1a1b126acd3e4ff734691ec34967f29
author_id_fullname_str_mv	e1a1b126acd3e4ff734691ec34967f29_***_Robert Lancaster
author	Robert Lancaster
author2	Robert Lancaster D. Paolucci C.E. Bevan T. Abdullah M. Ritchie A. Olds L. Wilkin S. Mehraban N.P. Lavery N. Middleton J. Plummer
format	Journal article
container_title	Journal of Materials Research and Technology
institution	Swansea University
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 Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str	0
active_str	0
description	High entropy alloys (HEAs) are a relatively novel class of materials with unique properties. Unlike traditional alloys, which are typically based on a single primary metal combined with smaller amounts of other elements, HEAs are composed of five or more principal elements, each usually present in significant amounts. This study investigates the influence of chromium content on the microstructure and mechanical properties of CrₓCoFeMnNi HEAs focusing on three compositions: HEA10Cr, HEA20Cr, and HEA30Cr. Using Vickers hardness and shear punch testing at both room temperature and 400 °C, the research identifies a strong correlation between increasing Cr content and enhanced strength-based properties. Contrary to conventional behavior, grain size and secondary dendrite arm spacing exhibited limited influence, with mechanical performance instead dominated by chemical composition, lattice distortion, and elemental segregation. The HEA30Cr alloy displayed the highest hardness and shear strength, attributed to more severe lattice distortion, Cr-induced dendritic growth, and sigma phase formation. Elevated temperatures reduced strength and strain hardening due to increased dislocation mobility, though ductility remained largely unaffected. Strain rate sensitivity was found to be modest at room temperature and negligible at 400 °C. These findings underscore the critical role of Cr in tuning the mechanical response of FCC-based HEAs and highlight the need for compositional control to balance strength and ductility for high-performance applications.
published_date	0001-01-01T05:27:45Z
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score	11.089967

Effect of Cr content on the mechanical behaviour of a high entropy alloy

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