A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion
- Authors
- Luo, Hong; Sohn, Seok Su; Lu, Wenjun; Li, Linlin; Li, Xiaogang; Soundararajan, Chandrahaasan K.; Krieger, Waldemar; Li, Zhiming; Raabe, Dierk
- Issue Date
- 17-6월-2020
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE COMMUNICATIONS, v.11, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 11
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54997
- DOI
- 10.1038/s41467-020-16791-8
- ISSN
- 2041-1723
- Abstract
- Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a strong and ductile CoNiV medium-entropy alloy with face-centered cubic structure. It shows high resistance to hydrogen embrittlement at ambient temperature at a strain rate of 10(-4)s(-1), due to its low hydrogen diffusivity and the deformation twinning that impedes crack propagation. Moreover, a dense oxide film formed on the alloy's surface reduces the hydrogen uptake rate, and provides high corrosion resistance in dilute sulfuric acid with a corrosion current density below 7 mu Acm(-2). The combination of load carrying capacity and resistance to harsh environmental conditions may qualify this multi-component alloy as a potential candidate material for sustainable and safe infrastructures and devices. Strong and ductile materials with resistance to both corrosion and hydrogen embrittlement remain rare and yet are essential for hydrogen-propelled industries. Here, the authors show that a CoNiV medium-entropy alloy with face-centered cubic structure fulfils all the above criteria.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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