Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings

Meghwal, Ashok and Anupam, Ameey and Luzin, Vladimir and Schulz, Christiane and Hall, Colin and Murty, B S and et al, . (2021) Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings. Journal of Alloys and Compounds, 854. pp. 1-20. ISSN 0925-8388

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The combination of technical advantages of high entropy alloys (HEAs) and manufacturing capabilities of thermal spray (TS) offer potential towards new protective coatings to address extreme engineering environments. In this research, equi-atomic AlCoCrFeNi HEA coatings were synthesized via atmospheric plasma spray (APS) using mechanically alloyed feedstock, and a correlation between microstructure and mechanical properties in terms of both hardness and wear were established at multiscale levels. In addition, electrochemical performance in sea water and the overall residual stress distribution in the HEA coatings were also assessed. Superimposition of scanning electron micrographs and statistically analysed heat and contour maps using nanoindentation datasets revealed deviations in localized properties within and across individual phases; which were supported by Weibull plots of individual phases. Scanning wear tests revealed superior nanowear resistance of oxide phases developed by in-flight oxidation during APS process. In comparison, the HEA phases in the coating exhibited significant localized plastic deformation. The outcome of macroscale wear testing postulated that plasma sprayed AlCoCrFeNi HEA coatings exhibited superior wear resistance at high temperature (500 °C) than at room temperature, signifying high thermal stability of the coating. Residual stress generated due to plasma spray was measured using neutron diffraction and was tensile in nature. The corrosion resistance of the coating was slightly lower than that of SS316L, however, the anodic and cathodic polarization behaviour of HEA coating were identical to that of SS316L, indicating that the AlCoCrFeNi-based HEAs have prospects as corrosion resistant materials. © 2020 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Murty, B S
Item Type: Article
Additional Information: This work is supported under a Swinburne University Postgraduate Research Award (SUPRA). We thank Coherent Scientific and Bruker for offering an extended demonstration period of their nanoindentation XPM technology at Swinburne University of Technology. This study was also supported by the Australian Research Council (ARC) under the Industrial Transformation Training Centre project IC180100005 that is titled “Surface Engineering for Advanced Materials”, SEAM. The neutron diffraction experimental work was supported through the ANSTO user access programme (proposal P3925). We are grateful for the additional support for the industrial, university and other organization partners who have contributed to the establishment and support of SEAM. The authors acknowledge the facilities, scientific and technical assistance of Microscopy Australia at the University of South Australia, a facility that is funded by the University of South Australia, the State and Federal Governments. This work was performed in part at the South Australian node of the Australian National Fabrication Facility under the National Collaborative Research Infrastructure Strategy.
Uncontrolled Keywords: Corrosion; High entropy alloys (HEAs); Nanoindentation; Plasma spray; Residual stress; Wear
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 09 Sep 2022 10:50
Last Modified: 09 Sep 2022 10:50
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