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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
,
2
 and
1
1 Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 2 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China Current address: School of Mechanical Engineering, Xi'an Aeronautical University, Xi'an 710077, China.
* Author to whom correspondence should be addressed.
Received: 23 May 2013 / Revised: 2 July 2013 / Accepted: 10 July 2013 / Published: 19 July 2013
(This article belongs to the Special Issue High Entropy Alloys)
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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 (CC BY 3.0).

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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.

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