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Fabrication of AlCoCrFeNi High-Entropy Alloy Coating on an AISI 304 Substrate Via a CoFe₂Ni Intermediate Layer
Entropy
  • Wenyuan Cui
  • Sreekar Karnati
  • Xinchang Zhang
  • Elizabeth Burns
  • Frank W. Liou, Missouri University of Science and Technology
Abstract

Through laser metal deposition, attempts were made to coat AlCoCrFeNi, a high-entropy alloy (HEA), on an AISI 304 stainless steel substrate to integrate their properties. However, the direct coating of the AlCoCrFeNi HEA on the AISI 304 substrate was found to be unviable due to cracks at the interface between these two materials. The difference in compositional change was suspected to be the source of the cracks. Therefore, a new transition route was performed by coating an intermediate layer of CoFe2Ni on the AISI 304 substrate. Investigations into the microstructure, phase composition, elemental composition and Vickers hardness were carried out in this study. Consistent metallurgical bonding was observed along both of the interfaces. It was found that the AlCoCrFeNi alloy solidified into a dendritic microstructure. The X-ray diffraction pattern revealed a transition of the crystal structure of the AISI 304 substrate to the AlCoCrFeNi HEA. An intermediate step in hardness was observed between the AISI 304 substrate and the AlCoCrFeNi HEA. The AlCoCrFeNi alloy fabricated was found to have an average hardness of 418 HV, while the CoFe2Ni intermediate layer had an average hardness of 275 HV.

Department(s)
Mechanical and Aerospace Engineering
Comments
The authors gratefully acknowledge the financial support from NSF (National Science Foundation) grants CMMI-1547042 and CMMI-1625736.
Keywords and Phrases
  • Elemental powder,
  • Graded material,
  • High-entropy alloy,
  • Laser metal deposition
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2019 The Author(s), All rights reserved.
Creative Commons Licensing
Creative Commons Attribution 4.0
Publication Date
1-1-2019
Citation Information
Wenyuan Cui, Sreekar Karnati, Xinchang Zhang, Elizabeth Burns, et al.. "Fabrication of AlCoCrFeNi High-Entropy Alloy Coating on an AISI 304 Substrate Via a CoFe₂Ni Intermediate Layer" Entropy Vol. 21 Iss. 1 (2019) ISSN: 1099-4300
Available at: http://works.bepress.com/frank-liou/235/