Refractory High-Entropy Alloys for High-Temperature Applications

Dear Colleagues,

In recent years, high-entropy alloys (HEAs) have emerged as prominent metallic materials due to their unique design strategies and excellent mechanical properties. The high entropy, lattice distortion, sluggish diffusion, and cocktail effects inherent to HEAs provide them with high strength; oxidation, corrosion, and wear resistance; and other technologically important properties that give them stronger competitiveness relative to traditional alloys. Among different classes of HEAs, refractory high-entropy alloys (RHEAs) are considered a new kind of high-temperature material with great application prospects due to their excellent mechanical properties; they have the potential to replace nickel-based superalloys as the next-generation high-temperature material.

In recent years, the research on RHEAs has become more and more extensive and in-depth. RHEAs have the capacity to meet the huge market demand in the materials engineering field; however, there are still many challenges, such as the trade-off between high strength and high ductility, their structural design, and the performance optimization of RHEAs with brittle structures. We believe that this combination may shape the future of RHEAs and overcome the problem of the mutual exclusivity of high strength and high toughness.

In this Special Issue, we welcome articles on the following areas:

1. Manufacturing processes of RHEAs, including but not limited to casting, powder metallurgy, magnetron sputtering, and additive manufacturing technologies.

2. The microstructure and phase transformation of RHEAs, and RHEAs with ordered structures.

3. The mechanical properties and main strengthening and toughening mechanisms of RHEAs, such as solid-solution strengthening, precipitation strengthening, and transformation-induced plasticity (TRIP).

4. Understanding the deformation mechanisms of RHEAs at different temperatures using theoretical and experimental approaches.

5. Experimental and theoretical investigation of high-temperature oxidation resistance, and radiation, corrosion, and wear resistance.

6. Nanostructured high-entropy materials and nanocomposites based on RHEAs.

Dr. Ahmad Ostovari Moghaddam
Dr. Majid Naseri
Guest Editors

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• refractory high-entropy alloy
• manufacturing technology
• phase transformation
• mechanical properties
• high temperatures
• strengthening and toughening mechanisms