Natural-mixing guided design of refractory high-entropy alloys with as-cast tensile ductility
Name
1911.10975.pdf
Description
Submitted version
Size
4.68 MB
Format
Adobe PDF
Checksum (MD5)
6d4e7087403177f1565a377aa3b8602a
Author(s)
Wei, Shaolou
Kim, Sang Jun
Kang, Jiyun
Zhang, Yong
Zhang, Yongjie
Furuhara, Tadashi
Park, Eun Soo
Tasan, Cemal Cem
Date Issued
2020
Journal
Nature Materials
Publisher
Springer Science and Business Media LLC
Version
Original manuscript
Abstract
© 2020, The Author(s), under exclusive licence to Springer Nature Limited. Metallic alloys containing multiple principal alloying elements have created a growing interest in exploring the property limits of metals and understanding the underlying physical mechanisms. Refractory high-entropy alloys have drawn particular attention due to their high melting points and excellent softening resistance, which are the two key requirements for high-temperature applications. Their compositional space is immense even after considering cost and recyclability restrictions, providing abundant design opportunities. However, refractory high-entropy alloys often exhibit apparent brittleness and oxidation susceptibility, which remain important challenges for their processing and application. Here, utilizing natural-mixing characteristics among refractory elements, we designed a Ti38V15Nb23Hf24 refractory high-entropy alloy that exhibits >20% tensile ductility in the as-cast state, and physicochemical stability at high temperatures. Exploring the underlying deformation mechanisms across multiple length scales, we observe that a rare β′-phase plays an intriguing role in the mechanical response of this alloy. These results reveal the effectiveness of natural-mixing tendencies in expediting high-entropy alloy discovery.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
MIT Materials Research Laboratory
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DOI of Published Version
https://doi.org/10.1038/s41563-020-0750-4
