期刊
SCRIPTA MATERIALIA
卷 170, 期 -, 页码 106-110出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.05.039
关键词
High-entropy ceramics; Spark plasma sintering; Ultrahigh temperature ceramics; Borides; Carbides
类别
资金
- Office of Naval Research MURI program [N00014-15-1-2863]
- National Defense Science and Engineering Graduate Fellowship (NDSEG)
- ARCS Foundation, San Diego Chapter
- National Science Foundation [ECCS-1542148]
A new Reactive Flash Spark Plasma Sintering (ReaFSPS) method has been developed to synthesize high-entropy ultrahigh temperature ceramics (UHTCs), using (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B-2 and (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C as examples. X-ray diffraction, energy dispersive X-ray spectroscopy, and electron backscatter diffraction collectively show the formation of a single high-entropy phase within similar to 2 min. Notably, adding 3 wt.% of carbon can promote the formation and homogenization of a high-entropy diboride phase without aggressive mechanical alloying, achieving a >99% relative density. This work has established a new rapid and potentially scalable method to use ReaFSPS to synthesize homogenous high-entropy UHTCs from commercial powders of individual constituents. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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