First-principles study, fabrication, and characterization of (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramic
- South China Univ. of Technology (SCUT), Guangzhou (China). School of Materials Science and Engineering
- 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)
- 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
Web of Science
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