期刊
SCRIPTA MATERIALIA
卷 200, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113912
关键词
High-entropy ceramics; RENbO4; Ferroelastic domain; Ductility; Thermal conductivity
类别
资金
- National Natural Science Foundation of China [51961135301, 52072301, 51702259]
- Natural Science Basic Research Program of Shaanxi Province [2019JM432]
- Preresearch Fund of Weapons Equipment [61409220110]
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology [P2020-009]
A novel class of high-entropy rare-earth-niobates (RENbO4) was synthesized via solid-state reaction method, showing uniform doped element distribution and unique ferroelastic domain structure for enhanced mechanical properties and lower thermal conductivity. These moderate properties indicate a potential materials design for TBCs application.
A novel class of high-entropy rare-earth-niobates (RENbO4) was synthesized via solid-state reaction method. The XRD Rietveld refinement, Raman, and SEM-EDS results implied that the uniform doped element distribution. Unique ferroelastic domain structure formed by t-m phase transition brings the excellent ductility for RENbO4 ceramics (Poisson's ratios > 0.3), where 7RENbO(4) exhibits enhanced mechanical properties (Hv = 4.96 +/- 0.08 GPa, K-IC= 2.05 +/- 0.14 MPa.m(0.5)). Moreover, due to the lattice distortion derived from high-entropy effects, high-entropy rare-earth-niobates present lower thermal conductivity (6RENbO(4), 2.30-1.40 W m(-1) K-1, 100-1000 degrees C) and higher thermal expansion coefficients (5RENbO(4), 9.03 x 10(-6) K-1, 719 degrees C). These moderate properties indicate a potential materials design for TBCs application. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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