University of Oulu

Madan Patnamsetty, Ari Saastamoinen, Mahesh C. Somani & Pasi Peura (2020) Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy, Science and Technology of Advanced Materials, 21:1, 43-55, DOI: 10.1080/14686996.2020.1714476

Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy

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Author: Patnamsetty, Madan1; Saastamoinen, Ari1; Somani, Mahesh C.2;
Organizations: 1Materials Science and Environmental Engineering, Tampere University, Tampere, Finland
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3 MB)
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Language: English
Published: Informa, 2020
Publish Date: 2020-04-06


Models describing the constitutive flow behaviour of a metallic material are desired for appropriate process design and realization of defect-free components. In this study, constitutive equations based on the hyperbolic-sinusoidal Arrhenius-type model have been developed to define the hot deformation characteristics of a CoCrFeMnNi high-entropy alloy. The experimental true stress-true strain data were generated over a wide temperature (1023–1423 K) and strain rates (10−3–10 s−1) ranges. The impact of strain rate and temperature on deformation behaviour was further characterized through a temperature compensated strain rate parameter, i.e. Zener-Hollomon parameter. Additionally, a mathematical relation was employed to express the influence of various material constants on true-strain ranging from 0.2 to 0.75. Typical third order polynomial relations were found to be appropriate to fit the true-strain dependency of these material constants. The accuracy of the developed constitutive equations was evaluated by using the average absolute relative error (AARE) and correlation coefficient (R); the obtained values were 7.63% and 0.9858, respectively, suggesting reasonable predictions. These results demonstrate that the developed constitutive equations can predict the flow stress behaviour of the alloy with a good accuracy over a wide range of temperature and strain rate conditions and for large strains.

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Series: Science and technology of advanced materials
ISSN: 1468-6996
ISSN-E: 1878-5514
ISSN-L: 1468-6996
Volume: 21
Issue: 1
Pages: 43 - 55
DOI: 10.1080/14686996.2020.1714476
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This study was conducted with the support from the TUT Foundation as a part of Tampere University’s graduate school.
Copyright information: © 2020 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.