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High density (99.5%) ceramic composite composed of titanium boride and boron carbide (70/30 vol%) was obtained by spark plasma sintering and was tested by 3-point bending test in Ar atmosphere at 1800 °C. Bending strength was high, around 1.1 GPa. The strength–strain curve presents a peculiar shape composed of three regions where elastic and plastic deformations are active with a different weight. Based on transmission electron microscopy observations we propose a process of mechanical energy absorption driven by shear stress in the boron carbide crystals: stacking faults with (1-11) and (011) stacking planes and twins with (1-11) twinning plane rearrange into nano-twins with (10-1) twinning planes, orthogonal but equivalent to the initial ones. This rearrangement mechanism provides in the first instance a plastic signature, but further contributes strengthening.

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Keyword: TiB2, Boron carbide, bending strength, spark plasma sintering

Date published: 2023-04-27

Publisher: Springer Science and Business Media LLC

Journal:

• Scientific Reports (ISSN: 20452322) vol. 13 6915

Funding:

• Ministerul Cercetării, Inovării şi Digitalizării PC1-PN23080101
• NIMS PA5180 (セラミックスプロセッシング)
• NIMS AB3080 (多結晶光学材料 Research toward Innovative Optical Materials)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4958

First published URL: https://doi.org/10.1038/s41598-023-33135-w

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Updated at: 2024-11-14 16:31:00 +0900

Published on MDR: 2024-11-14 16:31:00 +0900