Influence of equiatomic Zr/(Ti,Nb) substitution on microstructure and ultra-high strength of (Ti,Zr,Nb)C medium-entropy ceramics at 1900 °C

Article Materials Science, Ceramics

Ultra-high strength medium-entropy (Ti,Zr,Ta)C ceramics at 1800°C by consolidating a core-shell structured powder

Qing-Qing Yang et al.

Summary: The study on core-shell structured ceramics found that they have fine grains and high flexural strength, with increased strength as temperature rises.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2022)

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Article Materials Science, Ceramics

Strength of single-phase high-entropy carbide ceramics up to 2300°C

Lun Feng et al.

Summary: The mechanical properties of (Hf,Zr,Ti,Ta,Nb)C high-entropy carbide (HEC) ceramics were investigated, showing high hardness and strength. The flexural strength of the ceramics decreased above 1800 degrees Celsius as temperature increased.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2021)

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Article Materials Science, Ceramics

Optimal preparation of high-entropy boride-silicon carbide ceramics

Yan Zhang et al.

Summary: This study examined the effects of using borothermal and boro/carbothermal reduction methods in fabricating high-entropy boride-silicon carbide (HEB-SiC) ceramics. It was found that spark plasma sintering at 2000 degrees C could achieve HEB-SiC ceramics with > 98% theoretical density, and the addition of SiC resulted in slight coarsening of the microstructure. The results suggested that the choice of powder processing method and the inclusion of SiC phase could optimize the preparation of high-entropy boride-based ceramics.

JOURNAL OF ADVANCED CERAMICS (2021)

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Article Materials Science, Ceramics

High-strength medium-entropy (Ti,Zr,Hf)C ceramics up to 1800°C

Xiao-Fei Wang et al.

Summary: The medium-entropy (Ti, Zr, Hf)C ceramics exhibited high relative density and flexural strength at high temperatures, with no significant degradation even up to 1600 degrees C. The primary strengthening mechanism in these ceramics is attributed to lattice parameter mismatch effects between TiC and ZrC, which inhibit grain coarsening and increase grain-boundary strength.

JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2021)

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Review Nanoscience & Nanotechnology

High entropy alloys ? Tunability of deformation mechanisms through integration of compositional and microstructural domains

Rajiv S. Mishra et al.

Summary: The paradigm shift in alloying approach leading to the emergence of high entropy alloys (HEAs) allows for tuning performance by manipulating deformation mechanisms, while advancements in metastability engineering and processing strategies drive exponential growth in this field. HEAs provide unprecedented flexibility in controlling deformation mechanisms.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Article Physics, Multidisciplinary

Structure Formation in Equimolar Mixture of HfC-ZrC-TiC-NbC Carbides

D. Wang et al.

Summary: The structure formation of a ceramic multicomponent substitutional solid solution (Hf, Zr, Ti, Nb)C during hot pressing at temperatures between 1400 and 1900 degrees C is investigated. The resulting ceramic material exhibits improved mechanical properties compared to the initial carbides.

RUSSIAN PHYSICS JOURNAL (2021)

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Article Nanoscience & Nanotechnology

Multicomponent Ni-rich high-entropy alloy toughened with irregular-shaped precipitates and serrated grain boundaries

S. W. Wu et al.

Summary: A novel precipitation-strengthened multicomponent high-entropy alloy was designed with optimized grain boundaries, showing a transition from brittleness to ductility and significantly improving both strength and ductility of the material.

SCRIPTA MATERIALIA (2021)

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Article Materials Science, Multidisciplinary

Temperature Dependent Thermal and Elastic Properties of High Entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2: Molecular Dynamics Simulation by Deep Learning Potential

Fu-Zhi Dai et al.

Summary: The study predicted the thermal and elastic properties of high entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B-2 at different temperatures, and found that the predicted values agree well with experimental measurements. The use of machine learning potential opens up new possibilities for gaining insights into high entropy materials.

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY (2021)

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Review Materials Science, Ceramics

High-entropy ceramics: Present status, challenges, and a look forward

Huimin Xiang et al.

Summary: High-entropy ceramics are solid solutions of inorganic compounds with diverse crystal and electronic structures, providing large space for property tuning through band structure and phonon engineering. In addition to traditional strengthening, hardening, and low thermal conductivity, HECs exhibit new properties such as colossal dielectric constant and super ionic conductivity. Challenges in processing, characterization, and property predictions are highlighted, along with future directions for material exploration and in-depth characterization.

JOURNAL OF ADVANCED CERAMICS (2021)

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Article Materials Science, Ceramics

Influence of vanadium content on the microstructural evolution and mechanical properties of (TiZrHfVNbTa)C high-entropy carbides processed by pressureless sintering

Lei Chen et al.

Summary: A series of (TiZrHfVNbTa)C high-entropy ceramics with varying vanadium contents were fabricated using carbothermal reduction, with the addition of vanadium enhancing densification, refining grain size, and improving mechanical properties. Excessive vanadium, however, prevented the formation of a single-phase structure. The optimal ceramic exhibited high relative density, uniform microstructure, small grain size, and impressive mechanical properties.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2021)

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Article Nanoscience & Nanotechnology