Advanced High Entropy Alloy Materials and Films: Properties and Applications

Dear Colleagues,

In the era of technological progress, demand has been increasing for the development of innovative high-entropy alloys (HEAs) that offer exceptional corrosion resistance in harsh environments at elevated temperatures. Unlike traditional alloys where a single major alloying element dictates their properties (e.g., Ni in Ni-based superalloys, Al in aluminium alloys, or Fe in steel), HEAs consist of numerous principal elements, resulting in an enhanced mixing entropy and the creation of highly stable solid solutions.

This high-entropy effect and the formation of a single-phase structure enable HEAs (high-entropy alloys) to exhibit outstanding mechanical properties, including an exceptional fracture toughness, high strength, impressive fatigue resistance, and excellent creep resistance. Furthermore, HEAs are advantageous for high-temperature applications due to their ability to impede phase transformation through slow diffusion kinetics, a feature not commonly found in conventional alloys. Additionally, the lattice structures of HEAs exhibit significant distortions caused by the atomic misfit among the principal elements, which effectively inhibit dislocation movement and therefore prevent deformation at elevated temperatures.

This combination of high phase stability; remarkable mechanical properties such as high strength, hardness, wear resistance, and creep resistance; and low thermal conductivity positions HEAs as promising candidates for engineering materials designed to resist corrosion in elevated-temperature applications. This Research Topic seeks to gather significant advancements in the aforementioned fields, as well as to provide directions for future research on the novel methods of HEA fabrication and on applications in advanced engineering and corrosion.

We welcome and encourage Original Research articles, Extensive Reviews, Mini-reviews, and Viewpoints.

Areas of interest include but are not limited to the following:

• Novel methods of manufacturing and advanced characterization of HEAs;
• First-principles-based calculations based on HEAs;
• Application in high-temperature engineering and corrosion-resistant materials;
• Challenges in the field of HEAs;
• New research directions in the field and application of high-entropy alloys.

Dr. Sayan Sarkar
Guest Editor

Dr. Bitan Chakraborty
Guest Editor Assistant

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• CALPHAD