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Eutectic particles of B4C-TiB2 were reinforced with Ti by spark plasma sintering (SPS) or
infiltration. The SPSed samples with 20, 30 and 40 wt. % Ti consisted of ceramic phase, and had
a bicontinuous macrostructure formed by the Ti-rich region and the eutectic particles region,
while the infiltrated sample was a complex composite comprised of a 3D Ti-rich continuous
network, composite in nature, that contained Ti-metal and in which are embedded isolated
ceramic (eutectic) particles. The SPSed samples are brittle with the maximum bending strength
of 300 MPa for the 30 wt. % Ti, higher than for a reference sample produced by SPS from
directionally solidified eutectic particles. A higher amount of added Ti results in a higher
displacement in the bending test suggesting a higher fracture toughness. Simultaneous
strengthening and toughening of the composite was realized. The infiltrated sample was ductile,
while its bending strength (220 MPa) was comparable to the values measured for the brittle asintroduced
reference sample and the sample with 20 wt. % Ti, both produced by SPS. In the
SPSed and infiltrated samples at the interface between the Ti-rich region and B4C-TiB2 eutectic
particles, a local ‘pull-out’ intergranular fracturing mechanism mainly involving Ti-B 1D-grains
was observed. This local micromechanism together with a ‘pull out’ macromechanism of the
eutectic grains from the Ti-rich component are considered important for the bridging/anchoring
behavior responsible for the strengthening and toughening processes in our novel hierarchical
composites.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

Keyword: B4C–TiB2 eutectic, Ti reinforcement, Bending test, Hierarchical composites, Spark plasma sintering, Infiltration

Date published: 2020-08-01

Publisher: Elsevier BV

Journal:

• Ceramics International (ISSN: 02728842) vol. 46 issue. 18 p. 28132-28144

Funding:

• National Institute for Materials Science
• Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii PN19-03
• Ministry of Education and Science of Ukraine 0117U006427

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4985

First published URL: https://doi.org/10.1016/j.ceramint.2020.07.312

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Updated at: 2024-11-19 16:30:18 +0900

Published on MDR: 2024-11-19 16:30:19 +0900