Deformation behaviour and microstructural evolution of high-entropy CoFeMnNi alloy at hot deformation condition with low strain rate

Deformation behaviour and microstructural evolution of high-entropy CoFeMnNi alloy at hot deformation condition with low strain rate

Lihua Du, Jiaai Shi, Jiayu Liang, Kailun Zheng

download PDF

Abstract. High-entropy alloy is a promising structural material for high-temperature service applications due to the designable superior properties. Superplasticity, normally achieved at relatively high temperature and low strain rate, enables difficult to formation materials to manufacture complex-shaped parts. This paper presents a feasibility experimental study on the deformation and microstructure of CoFeMnNi high-entropy alloy under hot deformation conditions with low strain rate. A series of hot uniaxial tests were conducted at the temperature range between 800-1000℃ with typical strain rates of 10-4 and 10-5/s to determine the stress-strain behaviours. Additionally, to understand the deformation mechanism, microstructure evolution after deformation was characterized. Finally, a mechanism based constitutive model of high-entropy alloy was developed, which facilities the process optimization by finite element simulations.

High-Entropy Alloy, Deformation Behaviour, Super-Plastic Forming, Deformation

Published online , 11 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Lihua Du, Jiaai Shi, Jiayu Liang, Kailun Zheng, Deformation behaviour and microstructural evolution of high-entropy CoFeMnNi alloy at hot deformation condition with low strain rate, Materials Research Proceedings, Vol. 32, pp 253-263, 2023


The article was published as article 29 of the book Superplasticity in Advanced Materials

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

[1] Yeh J.W. Alloy design strategies and future trends in high-entropy alloys[J]. Jom, 2013, 65: 1759-1771.
[2] Ye Y.F. Wang Q, Lu J, et al. High-entropy alloy: challenges and prospects[J]. Materials Today, 2015, 19(6).
[3] Zhao S., Li Z., Zhu C. et al. Amorphization in extreme deformation of the CrMnFeCoNi high-entropy alloy[J]. Science advances, 2021, 7(5): eabb3108
[4] Zhang Y., Zuo T. T, Tang Z., et al. Microstructures and properties of high-entropy alloys[J]. Progress in materials science, 2014, 61: 1-93.
[5] D. B. Miracle and O. N. Senkov. A critical review of high entropy alloys and related concepts[J]. Acta Materialia, vol. 122, pp. 448-511, 2017/01/01/ 2017.
[6] W. Zhao et al. Significance of grain refinement on micro-mechanical properties and structures of additively-manufactured CoCrFeNi high-entropy alloy[J]. Materials Science and Engineering A, vol. 807, 202
[7] N.D. Stepanov, D.G. Shaysultanov, G.A. Salishchev, O.N. Senkov, Mechanical behavior and microstructure evolution during superplastic deformation of the fine-grained AlCoCrCuFeNi high entropy alloy[J]. Materials Science Forum, 1662-9752, Vols. 838-839, pp 302-30
[8] H. Shahmir, J. He, Z. Lu, M. Kawasaki, and T. G. Langdon. Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion[J]. Materials Science and Engineering: A, vol. 685, pp. 342-348, 2017/02/08/ 2017.
[9] N. Li et al. Achieving superior superplasticity in CoCrFeNiCu high entropy alloy via friction stir processing with an improved convex tool[J]. Materials Science and Engineering A, vol. 873, 2023.
[10] Z. Li et al. Effect of Annealing Temperature on Microstructure and Mechanical Properties of a Severe Cold-Rolled FeCoCrNiMn High-Entropy Alloy[J]. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 50, no. 7, pp. 3223-3237, 2019.
[11] J.G. Lin. Fundamentals of materials modelling for metals processing technologies: theories and applications[M]. Changsha, China: Central South University Press, 2019.