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Xu et al. Microstructures 2023;3:2023015 Microstructures
DOI: 10.20517/microstructures.2022.40

Research Article Open Access

Novel casting CoCrNiAl eutectic high entropy alloys

with high strength and good ductility

Ning Xu, Yubo Huang, Yuxian Cao, Shilei Li, Yan-dong Wang
Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Laboratory for Advanced Metals and
Materials, University of Science and Technology Beijing, Beijing 100083, China.

Correspondence to: Prof. Shilei Li, Beijing Advanced Innovation Center for Materials Genome Engineering, State Key Laboratory
for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China. E-mail:
lishilei@ustb.edu.cn; Prof. Yan-dong Wang, Beijing Advanced Innovation Center for Materials Genome Engineering, State Key
Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China. E-mail:
ydwang@ustb.edu.cn

How to cite this article: Xu N, Huang Y, Cao Y, Li S, Wang Yd. Novel casting CoCrNiAl eutectic high entropy alloys with high
strength and good ductility. Microstructures 2023;3:2023015. https://dx.doi.org/10.20517/microstructures.2022.40
Received: 2 Nov 2022 First Decision: 7 Dec 2022 Revised: 10 Feb 2023 Accepted: 14 Feb 2023 Published: 27 Feb 2023

Academic Editor: Huijun Li Copy Editor: Fangling Lan Production Editor: Fangling Lan

Abstract
Eutectic high-entropy alloys (EHEAs) have drawn increasing interest due to their fine castability as well as
appealing properties in recent years. In this work, two bulk-casting Co Cr Ni Al (x = 8 and 9) EHEAs
20-x/3 20-x/3 50-x/3 10+x
with regular L1 /B2 lamellar morphologies were successfully fabricated and studied. Both EHEAs show high
2
ultimate strength of ~1200 MPa combined with good uniform ductility (> 9%). Post-deformation transmission
electron microscopy results indicated a high density of dislocations and stacking faults in the L1 lamellae, while no
2
obvious dislocation in the B2 phases. This work can broaden the optimization of composition design in EHEAs and
provide useful guidance for further development of CoCrNiAl EHEAs.

Keywords: Eutectic high-entropy alloys, lamellar morphology, stacking faults, dislocations

INTRODUCTION
High entropy alloys (HEAs), which were proposed in 2004, have drawn increasing interest due to their
appealing properties relative to conventional alloys consisting of one or two principal elements . Despite
[1-4]
alloying various principal elements, HEAs, frequently solidify into simple crystal structures, such as face-
centered-cubic (FCC), body-centered-cubic (BCC) and hexagonal-close-packed (HCP) crystal structures or

© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0
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