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Investigation of the strain rate sensitivity of CoCrFeMnNiTix (x=0, 0.3) high-entropy alloys using the shear punch test

S. González, A.K. Sfikas, S. Kamnis Orcid Logo, Sean John, N.C. Barnard Orcid Logo, C. Gammer Orcid Logo, J. Eckert, C.G. Garay-Reyes, R. Martínez-Sánchez Orcid Logo, S.W. Naung, M. Rahmati, T. Keil, K. Durst, Robert Lancaster Orcid Logo

Materials and Design, Volume: 233, Start page: 112294

Swansea University Authors: Sean John, Robert Lancaster Orcid Logo

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Abstract

High entropy alloys (HEAs) are a novel class of metallic materials that exhibit a unique blend of properties due to their chemical composition and atomic arrangement. This research aims to investigate the strain rate sensitivity (SRS) of two HEA CoCrFeMnNiTix (x=0, 0.3) alloy compositions through th...

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Published in: Materials and Design
ISSN: 0264-1275 1873-4197
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa64443
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Abstract: High entropy alloys (HEAs) are a novel class of metallic materials that exhibit a unique blend of properties due to their chemical composition and atomic arrangement. This research aims to investigate the strain rate sensitivity (SRS) of two HEA CoCrFeMnNiTix (x=0, 0.3) alloy compositions through the use of shear punch testing. This method has been proven to provide reliable results for both HEA materials, including the CoCrFeMnNiTi0.3 HEA composition which was found to be inherently brittle and contained both σ-phase and Laves phase compounds with a hardness close to 14 GPa and a soft FCC phase. Among all the testing temperatures (room temperature to 400 °C) and deflection rates (0.2, 2 and 10 mm.min-1) used, only the CoCrFeMnNi HEA alloy was found to exhibit SRS at room temperature (m = 0.0333), while for the other HEA alloy variant and testing conditions, the SRS was found to be zero. From empirical correlations and finite element analysis (FEA), the calculated value for m ranged from 0.0333-0.0359, thus evidencing that the FEA simulations provide an accurate and suitable means of capturing the deformation behaviour of such alloys when subjected to shearing.
Keywords: Shear punch testing, High entropy alloy, Finite element simulation
College: Faculty of Science and Engineering
Funders: The authors would like to acknowledge the support from the UK Research and 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’. K.D. gratefully acknowledge the funding by the German Research Foundation (DFG) within the priority programme SPP2006 under Grant No. DU424/13–2.
Start Page: 112294