Abstract No.:	6255
Scheduled at:	Wednesday, June 10, 2020, Hall K1 2:40 PM High Entropy Alloys & Amorphous Coatings
Title:	Understanding mechanical and electrochemical performance of AlCoCrFeNi based high entropy alloy plasma spray coatings
Authors:	Ashok Meghwal* / Swinburne University of Technology, Australia Christiane Schultz / , Colin Hall/ Surface Engineering for Advanced Materials - SEAM, Swinburne University of Technology, Australia Ameey Anupam/ Surface Engineering for Advanced Materials - SEAM, Swinburne University of Technology, Australia Christopher C. Berndt/ Surface Engineering for Advanced Materials - SEAM, Swinburne University of Technology, Australia Andrew Siao Ming Ang/ Surface Engineering for Advanced Materials - SEAM, Swinburne University of Technology, Australia B. Murty/ , R. Kottadar/ ,
Abstract:	High entropy alloys (HEAs), being the newest generation of materials, with unique characteristics and properties have attracted prime research interest. Thermal spray coatings of HEAs, have shown promising capabilities of being applied in different extreme engineering environment. In this connection, the present work reports the microstructural, mechanical, wear and electrochemical behaviour of the plasma sprayed AlCoCrFeNi, AlCoCr0.5Ni and Al2CoCrFeNi HEAs coatings respectively. The corresponding HEAs were fabricated by means of mechanical alloying followed by spraying through atmospheric plasma spray (APS) process. The wear behaviour of all the coatings was evaluated using pin-on-disk test both at room temperature and 500 °C. Microstructural and compositional changes were investigated by XRD, SEM and EDS. The corrosion resistance of the coatings was analysed using potentiodynamic polarization method under sea water solution. The microstructural results indicated that coatings were intact, spallation free and acquired lamellar, composite type structure. All the coatings exhibited excellent wear performance at 500 °C as compared to room temperature, with AlCoCr0.5Ni HEA being the superior at both temperatures with lowest wear rate. Electrochemical analysis also revealed that AlCoCr0.5Ni HEA coating was more resistant to corrosion in sea water solution as compared to other two HEA coatings. Keywords: High Entropy Alloys (HEAs), Thermal Spray, Wear, Corrosion, Microstructure, Mechanical Properties.

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