Spheroidization behaviour of a fe-enriched eutectic high-entropy alloy

Yu Yun; Damon Kent; Qiyang Tan; Michael Bermingham; Ming-Xing Zhang

doi:10.1016/j.jmst.2020.01.066

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Spheroidization behaviour of a fe-enriched eutectic high-entropy alloy

Journal article

Peer reviewed

Spheroidization behaviour of a fe-enriched eutectic high-entropy alloy

Yu Yun, Damon Kent, Qiyang Tan, Michael Bermingham and Ming-Xing Zhang

Journal of Materials Science & Technology, Vol.51, pp.173-179

2020

DOI: https://doi.org/10.1016/j.jmst.2020.01.066

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Abstract

eutectic high-entropy alloys

instability

lamellar structure

spheroidization

mechanical properties

A cost-effective Fe-enriched eutectic high-entropy alloy (EHEA), Fe35Ni25Cr25Mo15, was designed and prepared to avoid the use of expensive Co that is commonly used in HEAs. However, the as-cast Fe-enriched EHEA was associated with brittleness. The present work aims to evaluate the possibility and feasibility of spheroidization of the lamellar structure of the EHEA in order to improve the ductility. Due to the high cooling rate of arc-melting, the as-melted Fe35Ni25Cr25Mo15 EHEA was found to be a pseudo eutectic alloy comprised of alternant Ïƒ phase (Cr0.22Mo0.18Fe0.6-type intermetallic) and face centred cubic (FCC) phase. The lamellar structure in the Fe-enriched EHEA remained stable up to 800 °C. The instability of the lamellar structure occurred at temperatures over 800 °C, which was resulted from migration of high-density faults (i.e. lamellar termination and ledges in the lamellae). However, the Fe35Ni25Cr25Mo15 EHEA still exhibited brittleness even after spheroidization at 1100 °C for 168 h due to the formation of the hard and brittle Ïƒ matrix in the pseudo Fe35Ni25Cr25Mo15 EHEA as a result of decomposition of the lamellar structure. Therefore, in contrast to the softening of traditional eutectic alloys, spheroidization treatment was considered as invalid to improve the ductility of pseudo-eutectic HEA with high fraction of intermetallic phase. The present work provides a valuable reference for those who aim to improve the ductility of brittle EHEA through spheroidization.

Details

Title: Spheroidization behaviour of a fe-enriched eutectic high-entropy alloy
Authors: Yu Yun (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - School of Science and Engineering
Qiyang Tan (Author) - University of Queensland
Michael Bermingham (Author) - University of Queensland
Ming-Xing Zhang (Author) - University of Queensland
Publication details: Journal of Materials Science & Technology, Vol.51, pp.173-179
Publisher: Zhongguo Kexueyuan Jinshu Yanjiusuo
Date published: 2020
DOI: 10.1016/j.jmst.2020.01.066
ISSN: 1005-0302; 1941-1162
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450953802621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering