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.

中文翻译：

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热喷涂高熵合金涂层：综述

高熵合金 (HEA) 是新一代材料，具有独特的特性和性能，并且在苛刻环境下以热喷涂形式展现出潜力。由于 HEAs 在散装和涂层形式中的卓越性能的报道，因此使用 HEA 作为涂层工艺的原料已经取得了进展。热喷涂 HEA 涂层优于传统材料的新报告加速了对该领域的进一步探索。这篇早期评论讨论了结合热喷涂和 HEA 的结果。结合热喷涂工艺的要求，讨论了HEA原料制备所采用的各种合成路线及其性能。然后将 HEA 原料与作为热喷涂工艺路线的函数的涂层微观结构和相组成进行比较和关联。随后，根据孔隙率、硬度和摩擦学特性，以及它们的氧化和电化学特性，总结了热喷涂 HEA 涂层的机械性能，然后是它们的潜在应用。热喷涂方法与用于合成厚 HEA 涂层的激光熔覆和表面合金化技术形成对比。此外，建议使用通过替代加工路线显示出优异性能但尚未在热喷涂框架内进行探索的 HEA。和摩擦学特性，以及它们的氧化和电化学特性，以及它们的潜在应用。热喷涂方法与用于合成厚 HEA 涂层的激光熔覆和表面合金化技术形成对比。此外，建议使用通过替代加工路线显示出优异性能但尚未在热喷涂框架内进行探索的 HEA。和摩擦学特性，以及它们的氧化和电化学特性，以及它们的潜在应用。热喷涂方法与用于合成厚 HEA 涂层的激光熔覆和表面合金化技术形成对比。此外，建议使用通过替代加工路线显示出优异性能但尚未在热喷涂框架内进行探索的 HEA。