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Title: First-principles study, fabrication, and characterization of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramic

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.16295· OSTI ID:1527127
 [1];  [2];  [1];  [3]; ORCiD logo [1]
  1. South China Univ. of Technology (SCUT), Guangzhou (China). School of Materials Science and Engineering
  2. Northwestern Polytechnical Univ., Xi'an (China). MOE Key Lab. of Materials Physics and Chemistry under Extraordinary Conditions, School of Natural and Applied Sciences; Ames Lab., and Iowa State Univ., Ames, IA (United States)
  3. Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

The formation possibility of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramic (HHC-1) was first analyzed by the first-principles calculations, and then, it was successfully fabricated by hot-pressing sintering technique at 2073 K under a pressure of 30 MPa. The first-principles calculation results showed that the mixing enthalpy and mixing entropy of HHC-1 were -0.869 ± 0.290 kJ/mol and 0.805R, respectively. The experimental results showed that the as-prepared HHC-1 not only had an interesting single rock-salt crystal structure of metal carbides but also possessed high compositional uniformity from nanoscale to microscale. By taking advantage of these unique features, it exhibited extremely high nanohardness of 40.6 ± 0.6 GPa and elastic modulus in the range from 514 ± 10 to 522 ± 10 GPa and relatively high electrical resistivity of 91 ± 1.3 μΩ·cm, which could be due to the presence of solid solution effects.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC02‐07CH11358; 51802100; 2017QNRC001; DE‐AC02‐07CH11358
OSTI ID:
1527127
Alternate ID(s):
OSTI ID: 1490123; OSTI ID: 1591866
Report Number(s):
IS-J-9895; IS-J 9895
Journal Information:
Journal of the American Ceramic Society, Vol. 102, Issue 7; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 203 works
Citation information provided by
Web of Science

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Review of high entropy ceramics: design, synthesis, structure and properties journal January 2019
Understanding the electronic structure, mechanical properties, and thermodynamic stability of (TiZrHfNbTa)C combined experiments and first-principles simulation journal July 2019
Dielectric properties and electrocaloric effect of high-entropy (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 ceramic journal November 2019
One‐step synthesis of coral‐like high‐entropy metal carbide powders journal April 2019
High‐temperature oxidation behavior of (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )C high‐entropy ceramics in air journal August 2019
Synthesis of high‐purity high‐entropy metal diboride powders by boro/carbothermal reduction journal June 2019
Two‐step synthesis process for high‐entropy diboride powders journal September 2019
Low‐temperature molten salt synthesis of high‐entropy carbide nanopowders journal October 2019
Formation criterion for binary metal diboride solid solutions established through combinatorial methods journal January 2020
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