The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics
Abstract
(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics (HEC) with a submicron grain size of 400 to 600 nm were fabricated by spark plasma sintering using a two-step sintering process. Both X-ray and neutron diffractions confirmed the formation of single-phase with rock salt structure in the as-fabricated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C samples. The effect of submicron grain size on the thermal stability and mechanical properties of HEC was investigated. The grain growth kinetics in the fine-grained HEC was small at 1300 and 1600°C, suggesting high thermal stability that was possibly related to the compositional complexity and sluggish diffusion in HEC. Compared to the coarse-grain HEC with a grain size of 16.5 µm, the bending strength and fracture toughness of fine-grained HEC were 25% and 20% higher respectively. The improvement of mechanical properties in fine-grained HEC may be attributed to micromechanistic mechanisms such as crack deflection.
- Authors:
-
[1];
[2];
[1]
- Univ. of Nebraska, Lincoln, NE (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); USNRC; Nebraska Research Initiative; Nebraska Public Power District
- OSTI Identifier:
- 1649038
- Alternate Identifier(s):
- OSTI ID: 1635283
- Grant/Contract Number:
- AC05-00OR22725; ECCS:1542182; 31310018M0045
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 8; Journal ID: ISSN 0002-7820
- Publisher:
- American Ceramic Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; grain size; high-entropy ceramics; mechanical properties; spark plasma sintering; thermal stability
Citation Formats
Wang, Fei, Zhang, Xiang, Yan, Xueliang, Lu, Yongfeng, Nastasi, Michael, Chen, Yan, and Cui, Bai. The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics. United States: N. p., 2020.
Web. doi:10.1111/jace.17103.
Wang, Fei, Zhang, Xiang, Yan, Xueliang, Lu, Yongfeng, Nastasi, Michael, Chen, Yan, & Cui, Bai. The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics. United States. https://doi.org/10.1111/jace.17103
Wang, Fei, Zhang, Xiang, Yan, Xueliang, Lu, Yongfeng, Nastasi, Michael, Chen, Yan, and Cui, Bai. Wed .
"The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics". United States. https://doi.org/10.1111/jace.17103. https://www.osti.gov/servlets/purl/1649038.
@article{osti_1649038,
title = {The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics},
author = {Wang, Fei and Zhang, Xiang and Yan, Xueliang and Lu, Yongfeng and Nastasi, Michael and Chen, Yan and Cui, Bai},
abstractNote = {(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics (HEC) with a submicron grain size of 400 to 600 nm were fabricated by spark plasma sintering using a two-step sintering process. Both X-ray and neutron diffractions confirmed the formation of single-phase with rock salt structure in the as-fabricated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C samples. The effect of submicron grain size on the thermal stability and mechanical properties of HEC was investigated. The grain growth kinetics in the fine-grained HEC was small at 1300 and 1600°C, suggesting high thermal stability that was possibly related to the compositional complexity and sluggish diffusion in HEC. Compared to the coarse-grain HEC with a grain size of 16.5 µm, the bending strength and fracture toughness of fine-grained HEC were 25% and 20% higher respectively. The improvement of mechanical properties in fine-grained HEC may be attributed to micromechanistic mechanisms such as crack deflection.},
doi = {10.1111/jace.17103},
journal = {Journal of the American Ceramic Society},
number = 8,
volume = 103,
place = {United States},
year = {Wed Mar 11 00:00:00 EDT 2020},
month = {Wed Mar 11 00:00:00 EDT 2020}
}
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