Kang, J, Liu, H, Du, H et al. (4 more authors) (2023) Microstructure, mechanical properties, Electrical resistivity, and corrosion behavior of (AlCr)ₓ(HfMoNbZr)₁-ₓ films. Applied Surface Science, 629. 157368. ISSN 0169-4332
Abstract
Refractory high-entropy alloys (RHEAs) have emerged as a new class of materials due to their exceptional properties such as high strength, high-temperature stability, and potential for corrosion resistance. In this study, we investigate the effect of Al and Cr co-alloying on the crystal structure, mechanical properties, electrical resistivity, and corrosion resistance of HfMoNbZr film. (AlCr)x(HfMoNbZr)1-x films were grown using direct current magnetron sputtering, with Al50Cr50 and Hf25Mo25Nb25Zr25 target co-sputtering. Our findings reveal that all films possess a B2-type BCC fine-grained crystallite structure. Moreover, an increase in AlCr content results in an increase in hardness and electrical resistivity, which can be attributed to the stronger directionally angular bonds and higher local lattice distortion caused by Al atoms, as confirmed by density functional theory (DFT) calculations. Additionally, the (AlCr)x(HfMoNbZr)1-x films exhibit excellent corrosion resistance in 3.5 wt% NaCl solution, as indicated by a corrosion current below 10−8 A/cm2. Remarkably, at PAlCr = 90 W, the current density reaches a minimum value of 4.85 ± 0.43×10-9 A/cm2. These results demonstrate the tunable properties of RHEAs through element alloying, which offers promising opportunities for various applications.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 Elsevier B.V. This is an author produced version of an article published in Applied Surface Science. Uploaded in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. |
Keywords: | High entropy alloy film, magnetron sputtering, Hardness, Corrosion behavior, density functional theory calculation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 Apr 2023 10:36 |
Last Modified: | 26 Apr 2024 00:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.apsusc.2023.157368 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:198685 |