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Coatings 2017, 7(4), 47; doi:10.3390/coatings7040047

Fabrication and Characterization of AlxCoFeNiCu1−x High Entropy Alloys by Laser Metal Deposition

Department of Mechanical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
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Author to whom correspondence should be addressed.
Academic Editor: T.M. Yue
Received: 16 December 2016 / Revised: 18 February 2017 / Accepted: 21 March 2017 / Published: 25 March 2017
(This article belongs to the Special Issue High Entropy Alloy Coatings)
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Abstract

High entropy alloys are multicomponent alloys that have at least five different principal elements as alloying elements. Each of these elements has an atomic percentage between 5% and 35%. Typically, they form body-centered cubic (bcc) or face-centered cubic (fcc) structure and are known to possess excellent mechanical properties, corrosion resistance, excellent electric and magnetic properties. Owing to their excellent corrosion and wear resistance, researchers are focusing on employing these materials as coatings. In this research, Laser Metal Deposition (LMD) was used to fabricate AlxCoFeNiCu1−x (x = 0.25, 0.5, 0.75) high entropy alloys from elemental powder based feedstocks. Thin wall claddings fabricated via LMD were characterized by a variety of techniques. Data from X-ray Diffraction (XRD) and Electron Back Scatter Diffraction (EBSD) suggested that with increase in Al content and decrease in Cu content, a change in crystal structure from a predominantly fcc to a combined fcc and bcc structure can be observed. The microstructure of the material was observed to be columnar dendritic. Data from standard less EDS analysis showed that the dendritic phase was Fe and Co enriched while the matrix was Cu and Al enriched in all the considered high entropy alloy fabrications. The Vickers hardness data was used to estimate the mechanical properties of these deposits. Results also showed that with the increase in aluminum content, AlxCoFeNiCu1−x displayed higher hardness. The high hardness values imply potential applications in wear resistant coatings. View Full-Text
Keywords: high entropy alloy; elemental powder; laser metal deposition high entropy alloy; elemental powder; laser metal deposition
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MDPI and ACS Style

Chen, X.; Yan, L.; Karnati, S.; Zhang, Y.; Liou, F. Fabrication and Characterization of AlxCoFeNiCu1−x High Entropy Alloys by Laser Metal Deposition. Coatings 2017, 7, 47.

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