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Entropy 2013, 15(7), 2833-2845; doi:10.3390/e15072833
Article

Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying

1,* , 1,†
, 2
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 and 1
Received: 23 May 2013; in revised form: 2 July 2013 / Accepted: 10 July 2013 / Published: 19 July 2013
(This article belongs to the Special Issue High Entropy Alloys)
Download PDF [702 KB, uploaded 19 July 2013]
Abstract: An AlCoCrCuFeNi high-entropy alloy (HEA) coating was fabricated on a pure magnesium substrate using a two-step method, involving plasma spray processing and laser re-melting. After laser re-melting, the microporosity present in the as-sprayed coating was eliminated, and a dense surface layer was obtained. The microstructure of the laser-remelted layer exhibits an epitaxial growth of columnar dendrites, which originate from the crystals of the spray coating. The presence of a continuous epitaxial growth of columnar HEA dendrites in the laser re-melted layer was analyzed based on the critical stability condition of a planar interface. The solidification of a columnar dendrite structure of the HEA alloy in the laser-remelted layer was analyzed based on the Kurz–Giovanola–Trivedi model and Hunt’s criterion, with modifications for a multi-component alloy.
Keywords: high entropy alloy; plasma spray; laser melting; epitaxial growth; columnar-to-equiaxed transition high entropy alloy; plasma spray; laser melting; epitaxial growth; columnar-to-equiaxed transition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yue, T.M.; Xie, H.; Lin, X.; Yang, H.; Meng, G. Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying. Entropy 2013, 15, 2833-2845.

AMA Style

Yue TM, Xie H, Lin X, Yang H, Meng G. Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying. Entropy. 2013; 15(7):2833-2845.

Chicago/Turabian Style

Yue, Tai M.; Xie, Hui; Lin, Xin; Yang, Haiou; Meng, Guanghui. 2013. "Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying." Entropy 15, no. 7: 2833-2845.


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