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Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying
Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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; in revised form: 2 July 2013 / Accepted: 10 July 2013 / Published: 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
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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.
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.
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.