Journal
CRYSTALS
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/cryst11060612
Keywords
refectory high-entropy alloys (RHEAs); powder metallurgy; casting; thin film; coatings; mechanical properties; oxidation resistance; corrosion resistance
Funding
- Ministry of Science and Technology of the Republic of China (Taiwan) [MOST 107-2221-E-194-024-MY3, MOST 109-2221-E-194-011-MY2]
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Refractory high-entropy alloys (RHEAs) are unique due to their high-temperature strength, oxidation resistance, and corrosion resistance, potentially replacing Ni-based superalloys. Various manufacturing processes and alloying elements affect the properties of RHEAs.
This review paper provides insight into current developments in refractory high-entropy alloys (RHEAs) based on previous and currently available literature. High-temperature strength, high-temperature oxidation resistance, and corrosion resistance properties make RHEAs unique and stand out from other materials. RHEAs mainly contain refractory elements like W, Ta, Mo, Zr, Hf, V, and Nb (each in the 5-35 at% range), and some low melting elements like Al and Cr at less than 5 at%, which were already developed and in use for the past two decades. These alloys show promise in replacing Ni-based superalloys. In this paper, various manufacturing processes like casting, powder metallurgy, metal forming, thin-film, and coating, as well as the effect of different alloying elements on the microstructure, phase formation, mechanical properties and strengthening mechanism, oxidation resistance, and corrosion resistance, of RHEAs are reviewed.
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