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Low-temperature consolidation of high-strength TiB2 ceramic composites via grain-boundary engineering using Ni-W alloy
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SYSNO ASEP 0494783 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Low-temperature consolidation of high-strength TiB2 ceramic composites via grain-boundary engineering using Ni-W alloy Author(s) Chlup, Zdeněk (UFM-A) RID, ORCID
Bača, L. (SK)
Hadraba, Hynek (UFM-A) RID, ORCID
Kuběna, Ivo (UFM-A) RID, ORCID
Roupcová, Pavla (UFM-A) RID, ORCID
Kováčová, Z. (SK)Number of authors 6 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 738, DEC (2018), s. 194-202Number of pages 9 s. Language eng - English Country CH - Switzerland Keywords Titanium diboride ; Metallic dopants ; Microstructure ; Mechanical properties ; Fracture behaviour Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000450377700021 EID SCOPUS 85054168068 DOI 10.1016/j.msea.2018.09.100 Annotation The concept of the consolidation of titanium diboride at relatively low temperature via formation of the solid
solution was used in this research. A specially designed Ni-W alloy prepared by mechanical alloying method was
used as the solid solution formation additive. The low amount of Ni-W alloy and TiB2 powder were mixed
together and consequently consolidated in the temperature interval from 1300 °C to 1400 °C. The development
of the microstructure and resulting mechanical behaviour of these composites were analysed in detail. The grain
size of TiB2 below 3 micrometres was obtained for all processing temperatures. The highest processing temperature
of 1400 °C resulted in the flexural strength on the level of 875 MPa and the elastic modulus being nearly
500 GPa. The fracture toughness was about 5 MPam0.5. Formation of the solid solution was confirmed by XRD
and TEM analysis. Due to the targeted change in chemical composition on grain boundaries and TiB2 lattice
distortions by addition of transition metals with higher ionic radii a hypothesis about the preferential formation
of solid solution layer on the surface of TiB2 grains taking into account their orientation was formulated.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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