High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

D. Demirskyi; O. Vasylkiv; K. Yoshimi

doi:10.1016/j.jeurceramsoc.2021.08.038

High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

D. Demirskyi, O. Vasylkiv, K. Yoshimi

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 °C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarse-grained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 °C–2000 °C. In contrast, results for the ceramics with a grain size below 20 μm indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.

Original language	English
Pages (from-to)	7442-7449
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	41
Issue number	15
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2021.08.038
Publication status	Published - 2021 Dec

Keywords

Flexural strength
Grain size
Hafnium carbide
High-temperature materials

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/j.jeurceramsoc.2021.08.038

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title = "High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering",

abstract = "In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 °C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarse-grained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 °C–2000 °C. In contrast, results for the ceramics with a grain size below 20 μm indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.",

keywords = "Flexural strength, Grain size, Hafnium carbide, High-temperature materials",

author = "D. Demirskyi and O. Vasylkiv and K. Yoshimi",

note = "Funding Information: Authors express their sincere appreciation to Dr. Toshiyuki Nishimura (NIMS) for providing access to the evaluation of high-temperature strength, this study would not be as complete otherwise. Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

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doi = "10.1016/j.jeurceramsoc.2021.08.038",

language = "English",

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T1 - High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

AU - Demirskyi, D.

AU - Vasylkiv, O.

AU - Yoshimi, K.

N1 - Funding Information: Authors express their sincere appreciation to Dr. Toshiyuki Nishimura (NIMS) for providing access to the evaluation of high-temperature strength, this study would not be as complete otherwise. Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/12

Y1 - 2021/12

N2 - In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 °C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarse-grained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 °C–2000 °C. In contrast, results for the ceramics with a grain size below 20 μm indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.

AB - In this study, we report the three-point flexural strength and fracture toughness of monolithic hafnium carbide up to 2000 °C. HfC with different grain sizes was consolidated using the spark plasma sintering method. Coarse-grained monoliths showed a weak dependence on the strain rate during high-temperature tests at 1600 °C–2000 °C. In contrast, results for the ceramics with a grain size below 20 μm indicated a positive dependence of the yield strength vs strain rate. This allowed us to identify the activation energy for high-temperature deformation in flexure as 370 kJ/mol. This level of activation energy is in satisfactory agreement with reports about the diffusion of C in hafnium carbide.

KW - Flexural strength

KW - Grain size

KW - Hafnium carbide

KW - High-temperature materials

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AN - SCOPUS:85113390912

SN - 0955-2219

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JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 15

ER -

High-temperature deformation in bulk polycrystalline hafnium carbide consolidated using spark plasma sintering

Abstract

Keywords

ASJC Scopus subject areas

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