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Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding

School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, Anhui, China
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Academic Editor: T. M. Yue
Coatings 2017, 7(1), 7; https://doi.org/10.3390/coatings7010007
Received: 9 December 2016 / Revised: 3 January 2017 / Accepted: 6 January 2017 / Published: 11 January 2017
(This article belongs to the Special Issue High Entropy Alloy Coatings)
High-entropy alloys (HEAs) are novel solid solution strengthening metallic materials, some of which show attractive mechanical properties. This paper aims to reveal the effect of adding small atomic boron on the interstitial solid solution strengthening ability in the laser cladded CoCrFeNiAlxCu0.7Si0.1By (x = 0.3, x = 2.3, and 0.3 ≤ y ≤ 0.6) HEA coatings. The results show that laser rapid solidification effectively prevents brittle boride precipitation in the designed coatings. The main phase is a simple face-centered cubic (FCC) matrix when the Al content is equal to 0.3. On the other hand, the matrix transforms to single bcc solid solution when x increases to 2.3. Increasing boron content improves the microhardness of the coatings, but leads to a high degree of segregation of Cr and Fe in the interdendritic microstructure. Furthermore, it is worth noting that CoCrFeNiAl0.3Cu0.7Si0.1B0.6 coatings with an FCC matrix and a modulated structure on the nanometer scale exhibit an ultrahigh hardness of 502 HV0.5. View Full-Text
Keywords: high entropy alloy; laser cladding; boron; solid solution strengthening high entropy alloy; laser cladding; boron; solid solution strengthening
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He, Y.; Zhang, J.; Zhang, H.; Song, G. Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding. Coatings 2017, 7, 7.

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