High entropy induced structural stabilization, anisotropy transition and magnetization enhancement effect in La<sub>2</sub>Co<sub>17</sub>

Yin, Linhan; Guo, Yanqun; Guo, Xinpeng

doi:10.1039/d2tc02374a

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…For the synthesis of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 ceramics via boro/carbothermal reduction (BCTR), the molar percentage of raw materials was calculated by Reaction (1) [32,33]:…”

Section: Preparation Of Heb and Heb-sic Ceramicsmentioning

confidence: 99%

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Huang,

Wang,

Fang

et al. 2024

Journal of Advanced Ceramics

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High-entropy diborides (HEBs) are considered as promising high-temperature structure materials owing to their high melting point and excellent thermal stability. However, the intrinsic brittleness is the main obstacle that seriously limits their practical applications. To overcome with this obstacle, carbon fibers (C f ) with outstanding mechanical properties are used in the present work as a first attempt to improve the damage tolerance of HEBs. The as-prepared C f /(Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC composite (C f /HEB-SiC) shows high relative density (97.9%) and good mechanical properties with flexural strength of 411±3 MPa and fracture toughness of 6.15±0.11 MPa•m 1/2 . More importantly, the damage tolerance parameter (D t ) has increased from 0.10 m 1/2 for HEB-SiC to 0.29 m 1/2 for C f /HEB-SiC. Through microstructural analysis and Vickers indentation of the composite, the toughening mechanisms are disclosed. The carbon fibers coated with carbon coatings demonstrate unique capacity for prolonging the crack propagation path, which promotes the reliability of the composite effectively. Moreover, the C f /(Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 -SiC composite also exhibits good static oxidation resistance in the temperature range of 1100-1500 ℃ in air due to the formation of the protective oxide layer constituting of multicomponent oxides (Zr)HfTiO 4 and (Zr)Hf 6 Ta 2 O 17 embedded in a continuous SiO 2 glass. These results are promising, and this primary work can be used as a reference to the synthesis of C f /HEBs for thermal protection materials under hightemperature serving conditions.

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Section: Preparation Of Heb and Heb-sic Ceramicsmentioning

confidence: 99%

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Huang,

Wang,

Fang

et al. 2024

Journal of Advanced Ceramics

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Semi-ordered high entropy materials: The case of high entropy intermetallic compounds

Moghaddam

Fereidonnejad

Cabot

2023

Journal of Alloys and Compounds

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Valence electron structures and thermal and magnetic properties of RCo5 (R=light rare earth) intermetallic compounds with medium- and high-entropy design at R site

Yin

Guo

et al. 2023

Journal of Alloys and Compounds

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High entropy induced structural stabilization, anisotropy transition and magnetization enhancement effect in La₂Co₁₇

Abstract: The binary R2Co17 (R= rare earths except for La) intermetallic compounds show excellent magnetic properties and have the potential application as high temperature magnet, however, the binary La2Co17 does not...

Cited by 4 publications

References 36 publications

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Semi-ordered high entropy materials: The case of high entropy intermetallic compounds

Valence electron structures and thermal and magnetic properties of RCo5 (R=light rare earth) intermetallic compounds with medium- and high-entropy design at R site

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High entropy induced structural stabilization, anisotropy transition and magnetization enhancement effect in La2Co17

Abstract: The binary R2Co17 (R= rare earths except for La) intermetallic compounds show excellent magnetic properties and have the potential application as high temperature magnet, however, the binary La2Co17 does not...

Cited by 4 publications

References 36 publications

Improved damage tolerance and oxidation resistance of (Ti 0.2Zr 0.2Hf 0.2Nb 0.2Ta 0.2)B 2–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti 0.2Zr 0.2Hf 0.2Nb 0.2Ta 0.2)B 2–SiC by introducing chopped carbon fibers

Semi-ordered high entropy materials: The case of high entropy intermetallic compounds

Valence electron structures and thermal and magnetic properties of RCo5 (R=light rare earth) intermetallic compounds with medium- and high-entropy design at R site

Contact Info

Product

Resources

About

High entropy induced structural stabilization, anisotropy transition and magnetization enhancement effect in La₂Co₁₇

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers

Improved damage tolerance and oxidation resistance of (Ti _0.2Zr _0.2Hf _0.2Nb _0.2Ta _0.2)B ₂–SiC by introducing chopped carbon fibers