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

被引：60

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.

引用

页数：6

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