Effect of Sintering Time on Mechanical Properties of (Hf-Ta-Zr-Nb-Ti)C

Dakova, Lenka; Hrubovcakova, Monika; Sedlak, Richard; Kovalcikova, Alexandra; Medvecky, Lubomir; Naughton-Duszova, Annamaria; Vaskova, Iveta; Dusza, Jan

doi:10.2478/pmp-2021-0006

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Effect of Sintering Time on Mechanical Properties of (Hf-Ta-Zr-Nb-Ti)C

Powder Metallurgy Progress

Volume 21 (2021): Issue 2 (December 2021)

By: Lenka Dakova, Monika Hrubovcakova, Richard Sedlak, Alexandra Kovalcikova, Lubomir Medvecky, Annamaria Naughton-Duszova, Iveta Vaskova and Jan Dusza

Open Access

|Dec 2022

Abstract

Advanced high-entropy (Hf-Ta-Zr-Nb-Ti)C ceramics were successfully fabricated by the combination of ball milling and a two-step sintering process at 2100 °C for 5, 10, and 20 minutes from commercially available powders. The microstructure characteristics and mechanical properties of the developed systems were investigated. The high-entropy ceramics exhibit: medium grain size from 8 μm to 11 μm, high compositional uniformity, and high relative density above 99.5 %. Vickers hardness for all systems decreased with increasing applied load, with the highest value HV1 = 22.0 GPa for the system sintered for 5 minutes, while the fracture toughness changed from 2.70 MPa.m^1/2 to 3.50 MPa.m^1/2. The highest four-point flexural strength of 284 MPa was measured for the system with the smallest grain size.

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DOI: https://doi.org/10.2478/pmp-2021-0006 | Journal eISSN: 1339-4533 | Journal ISSN: 1335-8987

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Language: English

Page range: 50 - 57

Published on: Dec 29, 2022

Published by: Slovak Academy of Sciences, Mathematical Institute

In partnership with: Paradigm Publishing Services

Publication frequency: 2 issues per year

Keywords:

high-entropy carbide,

spark plasma sintering,

XRD analysis,

Vickers hardness,

indentation fracture resistance,

bending strength

Related subjects:

Engineering,

Mechanical engineering,

Fundamentals of mechanical engineering,

Bioengineering and biomedical engineering,

Biomedical electronics,

Materials sciences,

Materials sciences, other

© 2022 Lenka Dakova, Monika Hrubovcakova, Richard Sedlak, Alexandra Kovalcikova, Lubomir Medvecky, Annamaria Naughton-Duszova, Iveta Vaskova, Jan Dusza, published by Slovak Academy of Sciences, Mathematical Institute
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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