Journal ArticleDOI
High-entropy environmental barrier coating for the ceramic matrix composites
TLDR
In this article, a novel high-entropy material, (Yb0.2Y 0.2Lu 0.5.2Sc 0.6.2Gd 0.4.2)2Si2O7 ((5RE0.1.2.2]2SiO7) was proposed as a promising environmental barrier coating for SiC-based composites.Abstract:
A novel high-entropy material, (Yb0.2Y0.2Lu0.2Sc0.2Gd0.2)2Si2O7 ((5RE0.2)2Si2O7) was prepared by the sol-gel method and investigated as a promising environmental barrier coating (EBC) for SiC-based composites. The results of X-ray diffraction and transmission electron microscopy indicated that rare-earth elements were distributed homogeneously in the single monoclinic phase. Moreover, it was found that the new material (5RE0.2)2Si2O7 had good phase stability, well-matched coefficient of thermal expansion with SiC-based composite, and excellent resistance to water-vapor corrosion. The water-vapor corrosion test of (5RE0.2)2Si2O7 coated Cf/SiC composites further confirmed that (5RE0.2)2Si2O7 was suitable for application as EBC material and could provide effective protection to Cf/SiC composites from water-vapor damage.read more
Citations
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Journal ArticleDOI
High-entropy ceramics
TL;DR: In this paper, the authors discuss the current state of the disordered ceramics field by examining the applications and the high-entropy features fuelling them, covering both theoretical predictions and experimental results.
Journal ArticleDOI
High-entropy ceramics: Present status, challenges, and a look forward
Huimin Xiang,Yan Xing,Fu zhi Dai,Hongjie Wang,Lei Su,Lei Miao,Guo-Jun Zhang,Yiguang Wang,Xiwei Qi,Lei Yao,Hailong Wang,Biao Zhao,Jianqiang Li,Yanchun Zhou +13 more
TL;DR: High-entropy ceramics (HECs) as mentioned in this paper are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements.
Journal ArticleDOI
(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7: A novel high-entropy ceramic with low thermal conductivity and sluggish grain growth rate
TL;DR: In this article, a novel high-entropy (HE) rare-earth zirconate solid solution (La0.2Ce 0.2Sm 0.1 K-1.2
Journal ArticleDOI
High-entropy ceramics: Review of principles, production and applications
TL;DR: High-entropy ceramics with five or more cations have recently attracted significant attention due to their superior properties for various structural and functional applications as mentioned in this paper, and significant efforts were started to increase the entropy, minimize the Gibbs free energy, and achieve stable single-phase high-entropically stable ceramic films.
Journal ArticleDOI
Size disorder as a descriptor for predicting reduced thermal conductivity in medium- and high-entropy pyrochlore oxides
TL;DR: In this paper, the authors examined 22 single-phase pyrochlores and found that up to 35% reductions in thermal conductivity were achieved in medium and high-entropy compositions with retained moduli, thereby attaining insulative yet stiff properties for thermal barrier coating applications.
References
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Journal ArticleDOI
Microstructures and properties of high-entropy alloys
TL;DR: The concept of high entropy introduces a new path of developing advanced materials with unique properties, which cannot be achieved by the conventional micro-alloying approach based on only one dominant element as mentioned in this paper.
Journal ArticleDOI
A fracture-resistant high-entropy alloy for cryogenic applications
Bernd Gludovatz,Anton Hohenwarter,Dhiraj Catoor,Edwin H. Chang,Easo P. George,Easo P. George,Robert O. Ritchie,Robert O. Ritchie +7 more
TL;DR: This work examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m1/2.
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Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys
TL;DR: In this paper, two refractory high entropy alloys with compositions near Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, were produced by vacuum arc-melting.
Journal ArticleDOI
High-entropy alloy: challenges and prospects
TL;DR: In this paper, a critical review of the recent studies aiming to address the fundamental issues related to phase formation in high-entropy alloys is provided, and novel properties of HEAs are also discussed, such as their excellent specific strength, superior mechanical performance at high temperatures, exceptional ductility and fracture toughness at cryogenic temperatures, superparamagnetism and superconductivity.
Journal ArticleDOI
Sluggish diffusion in Co-Cr-Fe-Mn-Ni high-entropy alloys
TL;DR: In this article, the diffusion couple method was used to measure the diffusion parameters of Co, Cr, Fe, Mn and Ni in ideal-solution-like Co-Cr-Fe-Mn-Ni alloys.