Thermal Spray High-Entropy Alloy Coatings: A Review

Meghwal, Ashok and Anupam, Ameey and Murty, B S and et al, . (2020) Thermal Spray High-Entropy Alloy Coatings: A Review. Journal of Thermal Spray Technology, 29 (5). pp. 1-37. ISSN 1059-9630

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Abstract

High-entropy alloys (HEAs) are a new generation of materials that exhibit unique characteristics and properties, and are demonstrating potential in the form of thermal spray coatings for demanding environments. The use of HEAs as feedstock for coating processes has advanced due to reports of their exceptional properties in both bulk and coating forms. Emerging reports of thermal sprayed HEA coatings outperforming conventional materials have accelerated further exploration of this field. This early-stage review discusses the outcomes of combining thermal spray and HEAs. Various synthesis routes adopted for HEA feedstock preparation and their properties are discussed, with reference to the requirements of thermal spray processing. The HEA feedstock is then compared and correlated with coating microstructure and phase composition as a function of the thermal spray processing route. Subsequently, the mechanical behavior of thermal spray HEA coatings is summarized in terms of porosity, hardness, and tribological properties, along with their oxidation and electrochemical properties, followed by their potential applications. The thermal spray methods are contrasted against laser cladding and surface alloying techniques for synthesizing thick HEA coatings. Furthermore, HEAs that have displayed excellent properties via alternative processing routes, but have not been explored within the framework of thermal spray, are recommended. © 2020, The Author(s).

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IITH Creators:

IITH Creators	ORCiD
Murty, B S	https://orcid.org/0000-0002-4399-8531

Item Type:

Article

Additional Information:

This study was supported by the Australian Research Council under the Industrial Transformation Training Centre project IC180100005 that is titled ‘Surface Engineering for Advanced Materials,’ SEAM. Ms. Ameey Anupam acknowledges the Joint Doctoral Degree Program between Swinburne University and IIT Madras for facilitating this collaboration. The authors are grateful for seed funding provided by Prof. A. Kapoor (Swinburne University) that initiated this international collaboration. A. Anupam, B.S. Murty, and R.S. Kottada acknowledge discussions with project review committee members (Profs. V. Jayaram, D. Banerjee, and S. Raghavan of IISc Bengaluru; and Dr. D. Das of DMRL, Hyderabad, India) under funding from Aeronautics Research and Development Board, India; sanction # ARDB/GTMAP/01/2031783/M/1/285/D(R&D).

Uncontrolled Keywords:

coatings; high-entropy alloys (HEAs); mechanical properties; microstructure; review; thermal spray

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

24 Nov 2022 11:04

Last Modified:

24 Nov 2022 11:04