A high-entropy V35Ti35Fe15Cr10Zr5 alloy with excellent high-temperature strength

Publication date: 5 May 2017
Source:Materials & Design, Volume 121
Author(s): Xin Xian, Zhihong Zhong, Bowen Zhang, Kuijing Song, Chang Chen, Shan Wang, Jigui Cheng, Yucheng Wu
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.

Graphical abstract

http://ift.tt/2lEf8Dy