Indentation Size Effect for the Hardness of B4C/TiB2 Ceramics

doi:10.11901/1005.3093.2016.686

Chinese Journal of Materials Research

2017, Vol. 31

Issue (12): 894-900 DOI: 10.11901/1005.3093.2016.686

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Indentation Size Effect for the Hardness of B₄C/TiB₂ Ceramics

Weiming GUO(

), Dawang TAN, Lixiang WU, Huatai LIN, Shanghua WU

School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

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Weiming GUO, Dawang TAN, Lixiang WU, Huatai LIN, Shanghua WU. Indentation Size Effect for the Hardness of B₄C/TiB₂ Ceramics. Chinese Journal of Materials Research, 2017, 31(12): 894-900.

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Abstract

Indentation size effect on the hardness measurement of hot-pressed 80%B₄C/TiB₂ and 20%B₄C/TiB₂ (in volume fraction) was investigated, while the indentation morphology was also characterized. In comparison with 20%B₄C/TiB₂, 80%B₄C/TiB₂ possesses higher relative density and hardness, but lower toughness. The two ceramics exhibit clearly the indentation size effect (ISE), whereby the measured hardness decreases with the increasing load. However, a slight increase of the measured hardness for 80%B₄C/TiB₂ with the increasing load, which may be ascribed to the crack occurrence for indentations during loading. The observed ISE-phenomena for the two ceramics can be described via several existing theory models, however among them the modified proportional specimen resistance model is the most suitable one. Accordingly, the ISE-degree for 80%B₄C/TiB₂ ceramic is slightly stronger than that for 20%B₄C/TiB₂ ceramic, while the true hardness of 80%B₄C/TiB₂ ceramic should be 4.4~6.5 GPa higher than that of 20%B₄C/TiB₂ ceramic.

Key words: composites, B₄C/TiB₂, modeling, indentation size effect, microstructure, mechanical properties

Received: 25 November 2016

ZTFLH:

TQ174

Fund: Supported by National Natural Science Foundation of China (Nos. 51674236 & 51034012)

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	Weiming GUO
	Dawang TAN
	Lixiang WU
	Huatai LIN
	Shanghua WU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.686 OR https://www.cjmr.org/EN/Y2017/V31/I12/894

Table 1 Composition (volume fraction) and mechanical properties of the samples

Fig.1 SEM micrographs of the samples (a) burnishing surface microstructure of 80%B₄C/TiB₂, (b) burnishing surface microstructure of 20%B₄C/TiB₂, (c) crack morphology of 80%B₄C/TiB₂, (d) crack morphology of 20%B₄C/TiB₂

Fig.2 Vickers Hardness dependent on test force for 80%B₄C/TiB₂ and 20%B₄C/TiB₂

Fig.3 Location and morphology of indentation at 0.98 N (a) 80%B₄C/TiB₂, (b) 20%B₄C/TiB₂

Fig.4 Indentation morphology of 80%B₄C/TiB₂(a) 0.49 N; (b) 0.98 N

Table 2 True hardness of the samples derived from various ISE models

Fig.5 Functional relationship of samples’ ISE for various models (a) PSR approach; (b) MPSR approach; (c) Hv² versus d^-1of MFSL approach; (d) lgHv versus lgd of MFSL approach)

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