Abstract
Low-activation structural materials for fusion applications beyond 700°C are desired. High-entropy alloys (HEAs) with excellent properties at elevated temperatures are suitable for use in nuclear reactors. A newly developed V35Ti35Fe15Cr10Zr5 HEA was fabricated by vacuum arc melting and the microstructure of as-cast and annealed sample was found to be composed of BCC solid solution phases. It was interesting to find that the yield strength of as-cast V35Ti35Fe15Cr10Zr5 HEA increased with increasing the temperature below 500°C, and it was much higher than that of vanadium alloy or martensitic steel for fusion reactors in the temperature range of room temperature to 900°C. At 700°C, the yield strength of V35Ti35Fe15Cr10Zr5 HEA was about 500MPa higher than that of vanadium alloy or martensitic steel, showing promise for high temperature applications. V35Ti35Fe15Cr10Zr5 alloy had a relative low ductility below 700°C, while the alloy exhibited a good ductility above 700°C.
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