| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments V
|
| Presentation Title |
Tungsten-Based WTaVCr Refractory High Entropy Alloys for Fusion Energy Applications |
| Author(s) |
Bai Cui, Yongchul Yoo, Xiang Zhang, Fei Wang, Xin Chen, Xing-Zhong Li, Michael Nastasi |
| On-Site Speaker (Planned) |
Bai Cui |
| Abstract Scope |
W-based WTaVCr refractory high entropy alloys (RHEA) may be promising candidate materials for plasma facing components in the first wall and diverter in fusion reactors. This alloy is developed by a powder metallurgy process combining mechanical alloying and spark plasma sintering (SPS), as well as laser powder bed fusion (LPBF). The samples contained two phases, in which the matrix is RHEA with a body-centered cubic structure, while the oxide phase was most likely Ta2VO6 and TaVO4 through a combined analysis of X-ray diffraction, energy-dispersive spectroscopy, and selected area electron diffraction. The higher oxygen affinity of Ta and V may explain the preferential formation of their oxide phases based on thermodynamic calculations. WTaVCr RHEA showed a peak compressive strength of 2997 MPa at room temperature and much higher micro- and nano-hardness than W and other RHEAs in the literature. Their high Rockwell hardness can be retained to at least 1000C. |