Abstract
The refractory high-entropy ceramics, TiZrHfNbTaBx (x = 0, 0.1, 1, 10), which vary from high-entropy alloys to high-entropy ceramics depending on the B-content, were fabricated using the arc-melting method. TiZrHfNbTa (x = 0), TiZrHfNbTaBx (x = 0–1), and (TiZrHfNbTa)B2 (x = 10) showed BCC, BCC with MB (M = Ti, Zr, Hf, Nb, Ta), and MB2 structures, respectively. The Vickers hardness and Young’s modulus of these materials increased with an increasing B-content because these ceramic properties are superior to those of metals. The weight gain during oxidation, measured using thermogravimetric analysis, revealed that the highest and lowest weight gains were observed for TiZrHfNbTaB and (TiZrHfNbTa)B2, respectively. Their weight gain depends on their crystal structures rather than their B-contents.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI: Grant-in-Aid for Research Activity Start-up (19K23496) and Grant-in-Aid for Early-Career Scientists (20K14613) by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT, Japan). Authors also would like to thank Prof. Ryuji Tamura (Tokyo University of Science) for material processing (fabrication of TiZrHfNbTaBx by arc-melting).
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Arai, Y., Saito, M. & Kogo, Y. Material design for TiZrHfNbTaBx: A boundary material of refractory high-entropy alloys and ceramics. MRS Advances 7, 848–852 (2022). https://doi.org/10.1557/s43580-022-00337-9
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DOI: https://doi.org/10.1557/s43580-022-00337-9