Progress on New Preparation Methods, Microstructures, and Protective Properties of High-Entropy Alloy Coatings

Abstract

Currently, the preparations of high-entropy alloy (HEA) coatings have developed into new methods such as thermal spraying, electrospark deposition technology, and magnetron sputtering. The microstructures and protective properties of HEA coatings prepared by different methods are bound to be different. Moreover, because HEAs have a wide range of composition systems, the difference in composition will inevitably lead to a change in process parameters and post-treatment methods, and then affect the microstructures and protective properties. This paper introduces the working mechanism of thermal spraying, electrospark deposition technology, and magnetron sputtering, compares the advantages and disadvantages of each method, and focuses on the influences of the compositions, process parameters, and post-treatment process on the microstructures and properties of the coating. Furthermore, this paper outlines the correlation between preparation methods, process parameters, microstructures, and properties, which will provide a reference for further development of the application of high-entropy alloy coatings. On this basis, the future development direction of HEA coatings is prospected.

Refractive Properties of Conjugated Organic Materials Doped with Fullerenes and Other Carbon-Based Nano-Objects

“…It should be mentioned once again that some nanoparticles are provoked to form the relief as novel coatings [80][81][82][83][84], which are useful not only for general optoelectronics but for biomedicine and biotechnology. Classical optoelectronic materials and natural ones were considered as the substrates for the perspective coatings, which influence the basic material properties as well.…”

Effect of Cu on microstructure and properties of Co2CrFeNiMnCux high-entropy alloy coatings prepared by laser cladding

“…The random mixing of multiple elements in HEAs resulted in higher mixing entropy, facilitating the formation of simple solid solution structures such as face-centred cubic (FCC), body-centred cubic (BCC) and hexagonal close-packed (HCP) structures. 8 HEAs exhibited four major characteristics: high-entropy effect in thermodynamics, slow diffusion effect in kinetics, lattice distortion effect in crystal structure and a cocktail effect in performance. 9 The interaction of multiple metal principal elements in HEAs contributed to their outstanding properties, including high oxidation resistance at elevated temperatures, high thermal conductivity and plasticity, excellent mechanical properties, high thermal stability and remarkable corrosion resistance.…”

Effect of Co Contents on Microstructure and Cavitation Erosion Resistance of NiTiAlCrCoxN Films

“…The high-entropy alloy film is a new material with high hardness, corrosion resistance [1,2], oxidation resistance [3], wear resistance [4,5] and corrosion resistance [6][7][8][9]. Nonmetallic elements such as C, N and O were doped into highentropy alloys to form high-entropy nitride or carbide films, which have better properties than high-entropy alloy films and can be used to improve the cavitation erosion resistance of parts [10][11][12][13]. In high-entropy ceramic films, the metal elements share cation positions and the nonmetallic elements occupy anionic positions, which forms a new material system and has a unique microstructure [11,14].…”