Synthesis, characterisation and erosion behaviour of AlCoCrMoNi high entropy alloy coating. (4th October 2019)

• Record Type: Journal Article
• Authors: Vallimanalan, A; Babu, S P Kumaresh; Muthukumaran, S; Murali, M; Mahendran, R; Gaurav, Vivek; Manivannan, S
• Is Part Of: Materials research express. Volume 6:Number 11(2019)
• Publication Date: 2019-10-04
• Subjects: high entropy alloy -- HVOF -- Erosion -- AlCoCrMoNi; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab4477
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: AlCoCrMoNi equiatomic high entropy alloy (HEA) powders were prepared by mechanical alloying. High energy planetary ball-mill was employed to mill the powders till single solid solution formation. X-Ray Diffraction (XRD) analysis of as prepared powder was done at 5, 10, 15 and 20 hours of milling. A single BCC phase was formed after 20 h. Field emission scanning electron microscopy (FESEM) was used to study the microstructure of the prepared powder. After 20 hours of milling, a homogenous mixture formed, which was further confirmed by EDAX mapping of as prepared powders. The alloy was coated onto a 316 steel substrate using High-velocity Oxy-fuel (HVOF) coating. Cross-section of the coating was analysed using scanning electron microscope (SEM). The slurry erosion resistance exhibited by the coating was tested using Water-jet Erosion tester with 20 m s −1, 25 m s −1 and 30 m s −1 jet velocity at 30°, 60° and 90° angular impingement. The coating exhibited high ductility along with superior erosion resistance compared to conventional wear resistant coatings.