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

Jiatong Zhu; Jie Xu; Ping Zhang; Xuanyu Meng; Shuyao Cao; Jiamin Wu; Mingyue Wei; Yusheng Shi; Michael J. Reece; Feng Gao

doi:10.1016/j.scriptamat.2021.113912

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

Jiatong Zhu, Jie Xu, Ping Zhang, Xuanyu Meng, Shuyao Cao, Jiamin Wu, Mingyue Wei, Yusheng Shi, Michael J. Reece, Feng Gao

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

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 7RENbO₄ 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 (6RENbO₄, 2.30-1.40 W m⁻¹ K⁻¹, 100-1000°C) and higher thermal expansion coefficients (5RENbO₄, 9.03 × 10⁻⁶ K⁻¹, 719°C). These moderate properties indicate a potential materials design for TBCs application.

Original language	English
Article number	113912
Journal	Scripta Materialia
Volume	200
DOIs	https://doi.org/10.1016/j.scriptamat.2021.113912
State	Published - 15 Jul 2021

Keywords

Ductility
Ferroelastic domain
High-entropy ceramics
RENbO
Thermal conductivity

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10.1016/j.scriptamat.2021.113912

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@article{7c0a3c5fa1c44c08bfe9a83c22fd927c,

title = "Enhanced mechanical and thermal properties of ferroelastic high-entropy rare-earth-niobates",

abstract = "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 7RENbO4 exhibits enhanced mechanical properties (Hv = 4.96±0.08 GPa, KⅠc = 2.05±0.14 MPa•m0.5). Moreover, due to the lattice distortion derived from high-entropy effects, high-entropy rare-earth-niobates present lower thermal conductivity (6RENbO4, 2.30-1.40 W m−1 K−1, 100-1000°C) and higher thermal expansion coefficients (5RENbO4, 9.03 × 10−6 K−1, 719°C). These moderate properties indicate a potential materials design for TBCs application.",

keywords = "Ductility, Ferroelastic domain, High-entropy ceramics, RENbO, Thermal conductivity",

author = "Jiatong Zhu and Jie Xu and Ping Zhang and Xuanyu Meng and Shuyao Cao and Jiamin Wu and Mingyue Wei and Yusheng Shi and Reece, {Michael J.} and Feng Gao",

note = "Publisher Copyright: {\textcopyright} 2021 Acta Materialia Inc.",

year = "2021",

month = jul,

day = "15",

doi = "10.1016/j.scriptamat.2021.113912",

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journal = "Scripta Materialia",

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TY - JOUR

T1 - Enhanced mechanical and thermal properties of ferroelastic high-entropy rare-earth-niobates

AU - Zhu, Jiatong

AU - Xu, Jie

AU - Zhang, Ping

AU - Meng, Xuanyu

AU - Cao, Shuyao

AU - Wu, Jiamin

AU - Wei, Mingyue

AU - Shi, Yusheng

AU - Reece, Michael J.

AU - Gao, Feng

PY - 2021/7/15

Y1 - 2021/7/15

N2 - 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 7RENbO4 exhibits enhanced mechanical properties (Hv = 4.96±0.08 GPa, KⅠc = 2.05±0.14 MPa•m0.5). Moreover, due to the lattice distortion derived from high-entropy effects, high-entropy rare-earth-niobates present lower thermal conductivity (6RENbO4, 2.30-1.40 W m−1 K−1, 100-1000°C) and higher thermal expansion coefficients (5RENbO4, 9.03 × 10−6 K−1, 719°C). These moderate properties indicate a potential materials design for TBCs application.

AB - 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 7RENbO4 exhibits enhanced mechanical properties (Hv = 4.96±0.08 GPa, KⅠc = 2.05±0.14 MPa•m0.5). Moreover, due to the lattice distortion derived from high-entropy effects, high-entropy rare-earth-niobates present lower thermal conductivity (6RENbO4, 2.30-1.40 W m−1 K−1, 100-1000°C) and higher thermal expansion coefficients (5RENbO4, 9.03 × 10−6 K−1, 719°C). These moderate properties indicate a potential materials design for TBCs application.

KW - Ductility

KW - Ferroelastic domain

KW - High-entropy ceramics

KW - RENbO

KW - Thermal conductivity

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DO - 10.1016/j.scriptamat.2021.113912

M3 - 文章

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VL - 200

JO - Scripta Materialia

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ER -

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

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Keywords

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