Study on Mechanical Properties and Toughening Mechanism of MWCNTs/Ti(C, N) Cermets-Based Composites

Shuo Qi Liu; Wei Liang Liu

doi:10.4028/www.scientific.net/KEM.544.291

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 544Study on Mechanical Properties and Toughening...

Study on Mechanical Properties and Toughening Mechanism of MWCNTs/Ti(C, N) Cermets-Based Composites

Abstract:

MWCNTs/Ti(C, N) cermets-based composites were prepared by vacuum hot-pressing sintering method. The mechanical properties of samples were examined. XRD and SEM were used to investigate the crystal structure of the composites and microstructure of fractures surface, respectively. The toughening mechanism of composites was discussed particularly. The experimental results showed that the optimum comprehensive mechanical properties of samples were obtained by adding 1wt% MWCNTs in the composites. The bending strength, Vickers hardness and fracture toughness of the composites were 1275.14MPa, 22.75GPa and 10.60MPa•m^1/2, respectively, which were improved by 16.89%, 17.15% and 25.59%, respectively, compared to the Ti(C, N)-based cermets without MWCNTs. Bridging and pulling out of MWCNTs, crack deflection, residual stress toughening and micro-voids toughening were attributed to the toughening mechanism of the composites.

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Periodical:

Key Engineering Materials (Volume 544)

Pages:

291-294

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.544.291

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Online since:

March 2013

Authors:

Shuo Qi Liu, Wei Liang Liu

Keywords:

Composite, MWCNT, Ti(C, N) Cermets-Based, Toughening Mechanism

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References

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