Enhanced mechanical and thermal properties of ferroelastic high-entropy rare-earth-niobates

被引：48
|
作者：
Zhu, Jiatong [1 ]
Xu, Jie [1 ,2 ,3 ]
Zhang, Ping [1 ]
Meng, Xuanyu [1 ]
Cao, Shuyao [1 ]
Wu, Jiamin [3 ]
Wei, Mingyue [1 ]
Shi, Yusheng [3 ]
Reece, Michael J. [2 ,4 ]
Gao, Feng [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, MIIT Key Lab Radiat Detect Mat & Devices, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, NPU QMUL Joint Res Inst Adv Mat & Struct, Xian 710072, Peoples R China
[3] Huazhong Univ Sci Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[4] Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England
来源：
SCRIPTA MATERIALIA | 2021年 / 200卷
基金：
中国国家自然科学基金;
关键词：
High-entropy ceramics; RENbO4; Ferroelastic domain; Ductility; Thermal conductivity; BARRIER; LANBO4; GD; SM; DY;
D O I：
10.1016/j.scriptamat.2021.113912
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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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页数：6
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