Dear Colleagues,

High-entropy alloys (HEAs) are defined as alloys with five or more principal elements. Each principal element has a concentration of 5~35 at.%. The multi-principal-element character of HEAs presents some important effects, including the high-entropy, sluggish diffusion, severe-lattice-distortion, and cocktail effects. These factors are much less pronounced in conventional alloys. Owing to the unique multi-principal-element composition, HEAs can possess special properties, including high strength/hardness, outstanding wear resistance, exceptional high-temperature strength, good structural stability, and good corrosion and oxidation resistance. Some of these properties are not observed in conventional alloys, making HEAs attractive in many fields, such as aerospace, nuclear energy, chemical plants, and marine vessels.

As the key processing methods, the additive manufacturing and welding technologies of high-entropy alloys have an impact on the future applications and technological developments of HEAs. The selection of feasible processes with optimized parameters is essential to enhance the applications of HEAs. However, the structure of HEAs varies with material systems, welding methods, and parameters. A systemic understanding of the structures and properties of the processed samples is directly relevant to the application of HEAs. Therefore, it is significantly meaningful to study in-depth the intrinsic relationship among the material systems, processing methods, process parameters, microstructure, and mechanical properties of HEAs during the additive manufacturing and welding processes.

The current Special Issue aims to explore the advanced additive manufacturing and welding technologies of HEAs and to study the basic principles of microstructure and property regulations. The articles presented in this Special Issue will address various topics, ranging from, but not limited to, the design of novel types of HEAs, the exploration of advanced welding technologies, the optimization of process parameters, microstructure regulation, and the performance improvement of HEAs.

Dr. Dejia Liu
Prof. Dr. Longzhi Zhao
Guest Editors

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• high-entropy alloys
• welding
• additive manufacturing
• microstructure evolution
• mechanical properties
• filler metals
• welding mechanism
• joint performance

High-entropy alloys (HEAs) are defined as alloys with five or more principal elements. Each principal element has a concentration of 5~35 at.%. The multi-principal-element character of HEAs presents some important effects, including the high-entropy, sluggish diffusion, severe-lattice-distortion, and cocktail effects. These factors are much less pronounced in conventional alloys. Owing to the unique multi-principal-element composition, HEAs can possess special properties, including high strength/hardness, outstanding wear resistance, exceptional high-temperature strength, good structural stability, and good corrosion and oxidation resistance. Some of these properties are not observed in conventional alloys, making HEAs attractive in many fields, such as aerospace, nuclear energy, chemical plants, and marine vessels.

As the key processing methods, the additive manufacturing and welding technologies of high-entropy alloys have an impact on the future applications and technological developments of HEAs. The selection of feasible processes with optimized parameters is essential to enhance the applications of HEAs. However, the structure of HEAs varies with material systems, welding methods, and parameters. A systemic understanding of the structures and properties of the processed samples is directly relevant to the application of HEAs. Therefore, it is significantly meaningful to study in-depth the intrinsic relationship among the material systems, processing methods, process parameters, microstructure, and mechanical properties of HEAs during the additive manufacturing and welding processes.

The current Special Issue aims to explore the advanced additive manufacturing and welding technologies of HEAs and to study the basic principles of microstructure and property regulations. The articles presented in this Special Issue will address various topics, ranging from, but not limited to, the design of novel types of HEAs, the exploration of advanced welding technologies, the optimization of process parameters, microstructure regulation, and the performance improvement of HEAs.